Cervera Ruiz, Miguel
Total activity: 367
Expertise
Computational Mechanichs, Structural Analysis
h index
23
Professional category
University professor
Doctoral courses
Doctor Ingeniero de Caminos, Canales y Puertos
Doctor of Philosophy in Civil Engineering
University degree
Ingeniero de Caminos, Canales y Puertos
Research group
(MC)2 - Group of Computational Mechanics on Continuous Medium
Department
Department of Strength of Materials and Structural Engineering
School
Barcelona School of Civil Engineering (ETSECCPB)
Associated research bodies
CIMNE. Centre Internacional de Mètodes Numèrics en Enginyeria Open in new window
E-mail
miguel.cerveraupc.edu
Contact details
UPC directory Open in new window
Collaborative networks
Links of interest
ResearchGate Open in new window
personal web-page Open in new window

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1 to 50 of 367 results
  • Computational modeling and sub-grid scale stabilization of incompressibility and convection in the numerical simulation of friction stir welding processes

     Agelet de Saracibar Bosch, Carlos; Chiumenti, Michele; Cervera Ruiz, Miguel; Dialami, Narges; Seret, Anthony
    Archives of computational methods in engineering
    Date of publication: 2014-03
    Journal article

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    This paper deals with the computational modeling and sub-grid scale stabilization of incompressibility and convection in the numerical simulation of the material flow around the probe tool in a friction stir welding (FSW) process. Within the paradigmatic framework of the multiscale stabilization methods, suitable pressure and convective derivative of the temperature sub-grid scale stabilized coupled thermomechanical formulations have been developed using an Eulerian description. Norton-Hoff and Sheppard-Wright thermo-rigid-viscoplastic constitutive material models have been considered. Constitutive equations for the sub-grid scale models have been proposed and an approximation of the sub-grid scale variables has been given. In particular, algebraic sub-grid scale (ASGS) and orthogonal sub-grid scale (OSGS) methods for mixed velocity, pressure and temperature P1/P1/P1 linear elements have been considered. Furthermore, it has been shown that well known classical stabilized formulations, such as the Galerkin least-squares (GLS) for incompressible (or quasi-incompressible) problems or the Streamline Upwind/Petrov-Galerkin (SUPG) method for convection dominant problems, can be recovered as particular cases of the multiscale stabilization framework considered. Using a product formula algorithm for the solution of the coupled thermomechanical problem, the resulting algebraic system of equations has been solved using a staggered procedure in which a mechanical problem, defined by the linear momentum balance equation, under quasi-static conditions, and the incompressibility equation, is solved first at constant temperature. Then a thermal problem, defined by the energy balance equation, is solved keeping constant the mechanical variables, i.e. velocity and pressure. The computational model has been implemented in an enhanced version of the finite element software COMET, developed by the authors at the International Center for Numerical Methods in Engineering (CIMNE). Two numerical examples have been considered. The first one deals with the numerical simulation of a coupled thermomechanical flow in a 2D rectangular domain. Steady-state and transient conditions have been considered. The goal of this numerical example has been the comparison between different sub-grid scale stabilization methods for the velocity and temperature equations. In particular, using a GLS stabilization method for the pressure equation, a comparison between SUPG and OSGS convective stabilization methods has been performed. Additionally, using a SUPG stabilization method for the temperature equation, a comparison between GLS and OSGS pressure stabilization methods has been done. The second example deals with the 3D numerical simulation of a representative FSW process. Numerical results obtained have been compared with experimental results available in the literature. A good agreement on the temperature distribution has been obtained and predicted peak temperatures compare well, both in value and position, with the experimental results available.

  • Thermo-mechanical analysis of welding processes

     Dialamishabankareh, Narges
    Defense's date: 2014-03-12
    Universitat Politècnica de Catalunya
    Theses

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    Esta tesis se centra en el estudio numérico del proceso de soldadura. El análisis realizado tiene en consideración tanto los fenómenos globales, como los efectos locales que ocurren en la zona térmicamente afectada (HAZ) cerca de la unión. En este trabajo nos hemos centrado en dos técnicas específicas: el proceso de deposición por capas a nivel global y el proceso de soldadura por fricción y batido a nivel local.Para el análisis a nivel global (estudio de un componente estructural) se utiliza un marco Lagrangiano, mientras que a nivel local, se utiliza una combinación de varios enfoques. Más concretamente, para modelar el proceso de FSW se crearon diferentes subdominios computacionales estudiándose cada uno de ellos con un enfoque cinemático diferente. Este análisis nos permite estudiar herramientas caracterizadas por geometrías complejas (no solamente cilíndricas). Además es posible analizar las grandes deformaciones del material en la zona de proceso (HAZ) sin la necesidad de remallar y utilizar algoritmos de re-mapeo variables. En este trabajo se propone un análisis termo-mecánico acoplado con un método de paso fraccionado iso-térmico para la simulación numérica de los procesos de soldadura, tanto a nivel local como global.Se propone además una formulación de elementos finitos mixta (desplazamientos/presión) para tener en cuenta el comportamiento isócorico del material en consecuencia del comportamiento visco-plástico del mismo. Se introduce el Método Variacional Multiescala (VMS) para evitar las restricciones la condición de estabilidad LBB, permitiendo el uso de interpolaciones lineales P1/P1 para los campos de desplazamiento (o velocidad) y presión, respectivamente. Se utiliza la misma estrategia de estabilización para hacer frente a las inestabilidades del campo de temperaturas, características de los problemas de convección dominante (análisis térmico en el marco euleriano o ALE).A nivel global, el comportamiento del material se caracteriza por un modelo constitutivo elasto-termo-viscoplástico. Se propone una transición suave en función del rango de temperatura para representar el cambio de estado de material, desde sólido a líquido pasando por la fase semi-sólida durante el cambio de fase.A nivel local, el análisis se caracteriza por un modelo constitutivo rígido-termo-visco-plástico. Se estudian, diferentes modelos (típicamente fluidos no Newtonianos) como Norton-Hoff o Sheppard-Wright, entre otros.La ecuación de balance de energía se resuelve en el formato de entalpía incluyendo el fenómeno de cambio de fase en términos de calor latente y contracción térmica. En este trabajo se detallan diferentes modelos de fuentes energéticas (láser, arco, haz de electrones, etc) para simular a nivel global el aporte de calor en la zona de proceso. Análogamente, se tiene en cuenta la generación del calor inducido por la disipación visco-plástica y por el contacto con fricción (modelo de Coulomb y de Norton) para la simulación numérica del proceso de FSW. Para el proceso SMD se desarrolla una técnica ad-hoc para la deposición del material de aporte. La estrategia de activación de elementos propuesta en este trabajo permite simular de forma precisa la deposición de las diferentes capas de material en el proceso de SMD sin dar lugar a la aparición de campos de tensión/deformación espurios. Finalmente, para analizar el movimiento del material en la zona de proceso de FSW se han implementado unos trazadores materiales. A través de este método es posible sacar información acerca de la calidad de la unión soldada, así como optimizar los parámetros del proceso de FSW, como velocidades de rotación y avance. Esta tesis se compone de una recopilación de 7 artículos publicados en revistas internacionales indexadas, así como de una introducción , que resume el estado de arte actual, las motivaciones y objetivos del estudio realizado, las principales aportaciones y mejoras desarrolladas, así como las líneas de trabajo futuro.

  • Elementos finitos mixtos estabilizados para flujos viscoplásticos

     Moreno Rivero, Elvira Rosa
    Defense's date: 2014-02-26
    Universitat Politècnica de Catalunya
    Theses

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    El objetivo de esta tesis es formular y evaluar una metodología para la resolución de las ecuaciones de Navier-Stokes para los fluidos viscoplásticos de Bingham y de Herschel-Bulkley mediante el método de los elementos finitos mixtos estabilizados velocidad/presión. Se desarrolla una formulación teórica, se realiza la implementación computacional y se presentan y evalúan soluciones numéricas para estos fluidos viscoplásticos.Los fluidos viscoplásticos se caracterizan por presentar una tensión de corte mínima, denominada tensión de fluencia. Por encima de esta tensión de corte mínima el fluido co-mienza a moverse. En caso de no superarse esta tensión de fluencia, el fluido se comporta como un cuerpo rígido o quasi-rígido, con velocidad de deformación nula. Se presentan inicialmente las ecuaciones de Navier-Stokes para un fluido y dos fluidos incompresibles e inmiscibles considerando superficie libre. Se presenta una revisión de los modelos reológicos Newtonianos y los modelos no-Newtonianos. Se hace una descripción detallada de los modelos viscoplásticos. Se describen los modelos viscoplásticos regulariza-dos de Papanastasiou. Se proponen modelos regualarizados de doble viscosidad como alter-nativa a los comúnmente usados.Se deducen las soluciones analítica en flujos paralelos para el fluido Newtoniano, el fluido de Bingham, de Herschel-Bulkley, el fluido pseudoplástico y dilatante. Se desarrolla el modelo discreto, así como la formulación estabilizada con los méto-dos de subescalas algebraica (Algebraic subgrid scale, ASGS), de subescalas ortogonales (Orthogonal subgrid scale, OSS) y de subescalas ortogonales con la presión y el termino convectivo desacoplados, split-OSS. En el caso del fluido con superficie libre se presenta el método euleriano simplificado, el cual usa el método de superficie de nivel level set para resolver el movimiento de esta superficie libre. Se presenta un estudio de convergencia con los métodos de estabilización OSS y ASGS en los flujos paralelos de Bingham y de Herschel-Bulkley. Los modelos regularizados de doble viscosidad muestran menor error de convergencia que los usados regularmente.Se presentan las soluciones numéricas desarrolladas en esta tesis para un amplio con-junto de problemas benchmark. Pueden dividirse en tres grupos: flujos de Bingham, flujos de Herschel-Bulkley y flujos con superficie libre. Las soluciones obtenidas validan la metodolo-gía propuesta en este trabajo de investigación comparándose muy bien con las soluciones analíticas, numéricas, con resultados experimentales y datos de campo.La metodología propuesta en esta tesis proporciona una herramienta computacional para estudiar flujos viscoplásticos confinados, muy comunes en la industria, y los flujos detríticos viscoplásticos con superficie libre. Palabras claves: Método de los elementos finitos estabilizados, incompresibilidad, método del level set, fluidos viscoplásticos, modelo de Bingham, modelo de Herschel-Bulkley, flujos de detritos, rotura de presa.

  • An apropos kinematic framework for the numerical modeling of friction stir welding

     Dialami, Narges; Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos
    Computers & structures
    Date of publication: 2013-02
    Journal article

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  • Shaped metal deposition processes

     Agelet de Saracibar Bosch, Carlos; Lundbäck, Andreas; Chiumenti, Michele; Cervera Ruiz, Miguel
    Date of publication: 2013-08
    Book chapter

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    The shaped metal deposition (SMD) process is a novel manufacturing technology which is similar to the multi-pass welding used for building features such as lugs and flanges on components. This innovative technique is of great interest due to the possibility of employing standard welding equipment without the need for extensive new investment.

    Postprint (author’s final draft)

  • A novel stress-accurate FE technology for highly non-linear analysis with incompressibility constraint: application to the numerical simulation of the FSW process

     Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos; Dialami, Narges
    International Conference on Numerical Methods in Industrial Forming Processes
    Presentation's date: 2013-07
    Presentation of work at congresses

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    In this work a novel finite element technology based on a three-field mixed formulation is presented. The Variational Multi Scale (VMS) method is used to circumvent the LBB stability condition allowing the use of linear piece-wise interpolations for displacement, stress and pressure fields, respectively. The result is an enhanced stress field approximation which enables for stress-accurate results in nonlinear computational mechanics. The use of an independent nodal variable for the pressure field allows for an adhoc treatment of the incompressibility constraint. This is a mandatory requirement due to the isochoric nature of the plastic strain in metal forming processes. The highly non-linear stress field typically encountered in the Friction Stir Welding (FSW) process is used as an example to show the performance of this new FE technology. The numerical simulation of the FSW process is tackled by means of an Arbitrary-Lagrangian-Eulerian (ALE) formulation. The computational domain is split into three different zones: the work.piece (defined by a rigid visco-plastic behaviour in the Eulerian framework), the pin (within the Lagrangian framework) and finally the stirzone (ALE formulation). A fully coupled thermo-mechanical analysis is introduced showing the heat fluxes generated by the plastic dissipation in the stir-zone (Sheppard rigid-viscoplastic constitutive model) as well as the frictional dissipation at the contact interface (Norton frictional contact model). Finally, tracers have been implemented to show the material flow around the pin allowing a better understanding of the welding mechanism. Numerical results are compared with experimental evidence.

    In this work a novel finite element technology based on a three-field mixed formulation is presented. The Variational Multi Scale (VMS) method is used to circumvent the LBB stability condition allowing the use of linear piece-wise interpolations for displacement, stress and pressure fields, respectively. The result is an enhanced stress field approximation which enables for stress-accurate results in nonlinear computational mechanics. The use of an independent nodal variable for the pressure field allows for an adhoc treatment of the incompressibility constraint. This is a mandatory requirement due to the isochoric nature of the plastic strain in metal forming processes. The highly non-linear stress field typically encountered in the Friction Stir Welding (FSW) process is used as an example to show the performance of this new FE technology. The numerical simulation of the FSW process is tackled by means of an Arbitrary-Lagrangian-Eulerian (ALE) formulation. The computational domain is split into three different zones: the work.piece (defined by a rigid visco-plastic behaviour in the Eulerian framework), the pin (within the Lagrangian framework) and finally the stirzone (ALE formulation). A fully coupled thermo-mechanical analysis is introduced showing the heat fluxes generated by the plastic dissipation in the stir-zone (Sheppard rigid-viscoplastic constitutive model) as well as the frictional dissipation at the contact interface (Norton frictional contact model). Finally, tracers have been implemented to show the material flow around the pin allowing a better understanding of the welding mechanism. Numerical results are compared with experimental evidence.

  • An orthotropic damage model for the analysis of masonry structures

     Pelà, Luca; Cervera Ruiz, Miguel; Roca Fabregat, Pedro
    Construction & building materials
    Date of publication: 2013-05
    Journal article

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    This paper presents a numerical model for nonlinear analysis of masonry structural elements based on Continuum Damage Mechanics. The material is described at the macro-level, i.e. it is modeled as a homogeneous orthotropic continuum. The orthotropic behavior is simulated by means of an original methodology, resulting from the concept of mapped tensors from the anisotropic field to an auxiliary workspace. The application of this idea to strain-based Continuum Damage Models is innovative and leads to several computational benefits. The suitability of the model for representing the behavior of different types of brickwork masonry is shown via the simulation of experimental tests.

  • Continuum FE models for the analysis of Mallorca Cathedral

     Roca Fabregat, Pedro; Cervera Ruiz, Miguel; Pelà, Luca; Clemente, Roberto; Chiumenti, Michele
    Engineering structures
    Date of publication: 2013
    Journal article

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    From the theoretical point of view, systems composed by masonry arches or vaults would require, during construction, the simultaneous activation of all structural elements in order to reach the optimum balance of thrusts. This is not obviously the case of complex ancient masonry constructions, whose long and gradual building process may have contributed to their deformed condition and even to damage. In this paper, the possible influence of the construction process as well as that of later long-term deformation on the final condition of the building is investigated in the case of a complex and large historical structure, namely Mallorca Cathedral. A FE code has been specifically developed for the present study. The code is able to account for construction processes through sequential-evolutionary analyses, with the description of masonry mechanical damage and long-term deformation. The representative bay of the cathedral is analyzed taking into account different construction phases, as emerged from historical research. The response of such substructure to transverse earthquake equivalent forces is then investigated. In this case, the damage model is improved with a local crack-tracking algorithm. This numerical strategy models the tensile damage as distinct cracks, leading to a better prediction of realistic collapsing mechanisms.

  • Modelización numérica del comportamiento constitutivo del daño local y global y su correlación con la evolución de las frecuencias naturales en estructuras de hormigón reforzado  Open access

     Paredes Lopez, Jairo Andrés
    Defense's date: 2013-11-11
    Universitat Politècnica de Catalunya
    Theses

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    Esta tesis surge de la necesidad de establecer un método racional y práctico para identificar, a través del cambio de las frecuencias naturales , el daño en estructuras de hormigón armado. Por lo que se desarrolla un nuevo modelo constitutivo de daño diferenciado con dos variables internas de daño utilizando una única superficie de discontinuidad para tracción, compresión y cortante; asimismo, se plantea un procedimiento numérico para el cálculo de las frecuencias naturales con sus formas modales de vibración para diferentes estados de daño de estructuras de hormigón armado; se presenta una metodología para correlacionar daño global y frecuencias naturales . Esta tesis se desarrollará en el marco del análisis de estructuras y la mecánica computacional, particularmente, del análisis de materiales compuestos utilizando la teoría de mezclas serie/paralelo. Los resultados numéricos obtenidos se han comparado con resultados experimentales y numéricos obtenidos de la literatura, se ha observado buenos ajustes de los resultados

    This thesis emerges from the need to establish a rational and smart method to estimate the global damage through changes on eigenfrequency of concrete structures. Therefore, a new constitutive damage model is developed with two scalar inner variables and using only one surface of discontinuity to traction, compression and shear. Additionally, a numerical process has been proposed to calculate eigenfrequencies and eigenvectors of concrete structure with different levels of damage. A methodology to correlation ship between global damage and changes on e1genfrequencies has been proposed. This thesis is based on structural analysis and computational mechanics and, particularly, on analysis of composite materials using serial/parallel mix theory. The numerical results obtained in this thesis is have been compared with experimental and numerical results obtained of literature, and can be seen a good fit.

  • Numerical modelling of friction stir welding processes

     Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos; Dialami, Narges
    Computer methods in applied mechanics and engineering
    Date of publication: 2013-02
    Journal article

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  • Structural assessment of Mallorca Cathedral

     Roca Fabregat, Pedro; Cervera Ruiz, Miguel; Pelà, Luca; Clemente, Roberto; Chiumenti, Michele
    Structural Analysis of Historical Constructions
    Presentation's date: 2012-10-15
    Presentation of work at congresses

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  • Construction process numerical simulation and seismic assessment of Mallorca Cathedral

     Roca Fabregat, Pedro; Pelà, Luca; Cervera Ruiz, Miguel; Clemente, Roberto
    International Brick and Block Masonry Conference
    Presentation's date: 2012-06-04
    Presentation of work at congresses

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    This paper presents a numerical study of Mallorca Cathedral carried out by means of a FE approach devised for the study of this complex historical construction. Previous studies, including inspection and historical research, have shown that part of the existing damage and deformation might have been experienced during the construction process itself, while later historical processes causing long-term deformation, may also have contributed significantly to the final deformation. In order to analyse the possible influence of the construction process and long term deformation on the deformation of the structure, a numerical tool has been developed to carry out sequential-evolutionary analyses, involving the superposition of consecutive construction stages. A constitutive model has been implemented accounting for both viscoelasticity and mechanical damage by means of an enhanced continuum damage model. This tool has been used to carry out the sequential FE analysis of a typical bay structure of the main nave of the building. The proposed numerical tool has been also used to assess the seismic performance of the typical bay, in the transverse direction, through a nonlinear static analysis. The proposed numerical strategy seems effective to describe deformation and damage and could be applied to other similar historical masonry constructions.

  • Benchmarking on bifurcation and localization in J2 plasticity for plane stress and plane strain conditions

     Cervera Ruiz, Miguel; Chiumenti, Michele; Di Capua, Daniel
    Computer methods in applied mechanics and engineering
    Date of publication: 2012-10-01
    Journal article

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  • Formulación de elementos finitos para vigas de sección abierta en laminados compuestos

     Vargas Mendoza, Pablo Enrique
    Defense's date: 2012-01-27
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
    Theses

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  • Advances in the development of the discrete element method for excavarion processes  Open access

     Labra González, Carlos Andrés
    Defense's date: 2012-07-19
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
    Theses

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    Modelling of granular materials, soils and rocks has been a challenging topic of investigation for decades. Classical continuum mechanics has been used to idealize soils and rocks, and numerical solution techniques such as finite element method (FEM) has been used to model these materials. Considering the idealization of the material, continuum mechanics allows the analysis of phenomena with discontinuous nature such as fracture in rock or soil via damage models. However, in more complex processes like rock milling or crushing, this kind of models are usually not suitable. Discrete models are more appropriate for problems with multiple discontinuities and particulate materials. The discrete element method (DEM) has been gaining popularity in analysis of granular materials, soils and rocks. Many aspects of this method still require more profound investigation. This thesis presents new developments of the discrete element method improving effi ciency and accuracy of modelling of rock-like materials, especially in excavation processes. All the numerical algorithms has been implemented in an in-house software, which was then used to run numerical examples. The basic formulation of DEM with linear elastic-perfectly brittle contact model is presented. The main di erence with other models found in the literature is the consideration of global sti ness and strength parameters that are constants in the whole model. The result of a simulations is strongly related with the con guration of the particle assembly used. Particle assemblies should be su ciently compact and ensure the isotropy to reproduce the physical properties of the modelled material. This thesis presents a novel technique for the generation of highly dense particle assemblies in arbitrary geometries, satisfying all the requirements for accurate discrete element simulations. One of the key issues in the use of the DEM is the estimation of the contact model parameters. A methodology is proposed for the estimation of the contact model parameters yielding required macroscopic properties of the material. The relationships between the contact model parameters and the mechanical properties of brittle materials, as well as the influence of the particles assembly con guration on the macroscopic properties, are analysed. A major di culty in the application of the DEM to real engineering problems is the high computational cost in simulation involving a large number of particles. The most common way to solve this is the use of parallel computing techniques, where multiple processors are used. As an alternative, a coupling scheme between DEM and the finite element method (FEM) is proposed in the thesis. Within the hybrid DEM/FEM model, DEM is only used in the region of the domain where it provides an advantage over a continuum-based approach, as the FEM. The coupling is dynamically adapted, starting with the whole domain discretized with FEM. During the simulation, in the regions where a high stress level are found, a change of modelling method from continuum FEM to the discrete DEM is employed. Finally, all the developments are applied to the simulation of a real excavation process. An analysis of the rock cutting process with TBM disc cutters is performed, where DEM and the DEM/FEM coupling technique presents an important advantage over other simulation techniques.

    La modelación de materiales granulares, terrenos y rocas ha sido un desafío para la investigación por décadas. La mecánica del continuo clásica ha sido utilizada para idealizar terrenos y rocas, y técnicas numéricas de solución, como el método de los elementos finitos (FEM), han sido usadas para modelar estos materiales. Considerando la idealización del material, la mecánica del continuo permite el análisis de fenómenos de naturaleza discontinua como la fractura en rocas y terreno mediante modelos de daño. Sin embargo, en procesos mas complejos como la molienda o trituración de roca, este tipo de modelos no suelen ser adecuados. Los modelos discretos son mas apropiados para problemas con múltiples discontinuidades y material particulado. El método de los elementos discretos (DEM) ha ido ganando popularidad en el análisis de materiales granulares, terrenos y rocas. Sin embargo, muchos aspectos de este método todavía requieren una investigación mas profunda. Esta tesis presenta nuevos desarrollos del método de los elementos discretos para mejorar su eficiencia y precisión en el modelado de materiales como roca, especialmente para procesos de excavación. Todos los algoritmos numéricos se han implementado en el programa propio, que ha sido utilizado para probar distintos ejemplos. La formulación básica del DEM, con un modelo lineal de contacto elástico perfectamente frágil ha sido utilizado en el presente trabajo. La principal diferencia con otros modelos de la literatura es la consideración de que los parámetros de rigidez y fuerzas máximas son valores globales y constantes en todo el modelo. El resultado de la simulación está fuertemente relacionado con la configuración del ensamblaje de partículas utilizado. El ensamblaje de partículas debe ser suficientemente compacto y asegurar la isotropía de las propiedades físicas del material modelado. La tesis presenta una nueva técnica para la generación de ensamblajes de partículas de alta densidad para geometrías arbitrarias, satisfaciendo todos los requisitos para una simulación con elementos discretos correcta. Uno de los temas clave en el uso del DEM es la estimación de los parámetros del modelo de contacto. Se propone una metodología para la estimación de los parámetros del modelo de contacto siguiendo las propiedades macroscópicas requeridas en el material Las relaciones entre los parámetros del modelo y las propiedades mecánicas de materiales frágiles, así como su la influencia de la configuración del ensamblaje de partículas son analizadas. Una gran dificultad en la aplicación del DEM en problemas reales de ingeniería es el alto costo computacional de simulaciones que consideran un gran número de partículas. La solución mas común para resolver esto es el uso de técnicas de computación paralela, donde se utiliza un gran número de procesadores. Como vía alternativa, un esquema acoplado entre el DEM y el FEM expuesto en la tesis. Con el modelo híbrido DEM/FEM, el DEM es usado solo en las partes del dominio donde presenta ventajas sobre el enfoque continuo del FEM. El acoplamiento puede ser adaptado dinámicamente, comenzando con todo el dominio discretizado con FEM, y durante la simulación, en las regiones donde se encuentran altos niveles de tensión, se emplea un cambio del método de simulación de continuo (FEM) a discreto (DEM). Finalmente, todos los desarrollos son aplicados a la simulación de un proceso excavación real. Se realiza un estudio del proceso de corte de roca con discos costadores, utilizados en tuneladoras, donde el DEM y la técnica de acoplamiento presentan una importante ventaja sobre otras técnicas de simulación.

  • Strain Injection Techniques in Numerial Modeling of Propagating Material Failure

     Baixinho Figueiredo dias, Ivo Miguel
    Defense's date: 2012-10-10
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
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  • A coupled Eulerian-PFEM model for the simulation of overtopping in rockfill dams  Open access

     Larese, Antonia
    Defense's date: 2012-07-05
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
    Theses

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    Rockfill dams are nowadays often preferred over concrete dams because of their economic advantages, their flexible design and thank to the great advance achieved in geosciences and geomechanics. Unfortunately their behavior in case of overtopping is still an open issue. In fact very little is known on this phenomenon that in most cases leads to the complete failure of the structure with catastrophic consequences in term of loss of lives and economic damage. The principal aim of the present thesis is the development of a computational method to simulate the overtopping and the beginning of failure of the downstream shoulder of a rockfill dam. The whole phenomenon is treated in a continuous framework. The fluid free surface problem outside and inside the rockfill slope is treated using a unique Eulerian fixed mesh formulation. A level set technique is employed to track the evolution of the free surface. The traditional Navier-Stokes equations are modified in order to automatically detect the presence of the porous media. The non-linear seepage is evaluated using a quadratic form of the resistance law for which the Ergun's coefficients have been chosen. The structural response of the solid skeleton is evaluated using a continuum viscous model. A non-Newtonian modified Bingham law is proposed for the simulation of the behaviour of a granular non-cohesive material. This approach has the possibility of considering a pressure sensitive resistance criteria. This is obtained inserting a Mohr-Coulomb failure criterion in the Bingham relation. Due to the large deformation of the mesh during the failure process, a Lagrangian framework is preferred to a fixed mesh one: the Particle Finite Element Method (PFEM) is therefore used. Its specific features make it appropriate to treat the rockfill material and its large deformations and shape changes. Finally a tool for mapping variables between non-matching meshes is developed to allow passing information between the fluid fixed and the dam moving meshes. All the numerical results are compared with experiments on prototype rockfill dams.

  • On the computational modeling and numerical simulation of FSW processes

     Agelet de Saracibar Bosch, Carlos; Chiumenti, Michele; Cervera Ruiz, Miguel; Dialami, Narges; SANTIAGO, D; Lombera, G
    Date of publication: 2012
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  • Distincio Jaume Vicenç Vives

     Cervera Ruiz, Miguel
    Award or recognition

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  • Viscoelasticity and damage model for creep behaviour of historical masonry structures

     Roca Fabregat, Pedro; Cervera Ruiz, Miguel; Pelà, Luca; Clemente, Roberto; Chiumenti, Michele
    The open civil engineering journal
    Date of publication: 2012-11-23
    Journal article

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    This paper presents a continuum model for the simulation of the viscous effects and the long-term damage ac-cumulation in masonry structures. The rheological model is based on a generalized Maxwell chain representation with a constitutive law utilizing a limited number of internal variables. Thanks to its computational efficiency, this approach is suitable for the analysis of large and complex structures. In the paper, the viscous and damage models are presented and their coupling is discussed. The FE simulation of the construction process of the representative bay of Mallorca Cathedral is presented, together with the analysis of the long-term effects. The parameters of the model are tentatively calibrated on the basis of the time-dependent viscous deformations detected during the cathedral monitoring.

  • Advances in the numerical simulation of 3D FSW processes

     Agelet de Saracibar Bosch, Carlos; Chiumenti, Michele; Cervera Ruiz, Miguel; Dialami, Narges; Santiago, Diego; Lombera, Guillermo
    International Symposium on Plasticity and its Current Applications
    Presentation's date: 2011-01
    Presentation of work at congresses

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    This work deals with the computational modeling and numerical simulation of 3D Friction Stir Welding (FSW) processes. Eulerian and ALE formulations have been used to solve the quasi-static thermal transient governing equations. Mixed P2/P1/P2+SUPG and subgrid-scale stabilized P1/P1/P1 velocity/pressure/temperature elements have been implemented. Norton-Hoff and Sheppard-Wright rigid thermoplastic material models have been considered. Computational visualization techniques using tracers have been applied in order to get the pattern of the material flow around the tool. Results obtained in the 3D simulation of FSW process have been compared to the experimental results available.

  • Mesh objective modelling of cracks using continuous linear strain and displacement interpolations

     Cervera Ruiz, Miguel; Chiumenti, Michele; Codina Rovira, Ramon
    Congresso de Métodos Numéricos em Engenharia
    Presentation's date: 2011-06-15
    Presentation of work at congresses

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    Continuum model for inelastic behaviour of masonry  Open access

     Pelà, Luca; Cervera Ruiz, Miguel; Roca Fabregat, Pedro
    Congresso dell'Associazione Italiana di Meccanica Teorica e Applicata
    Presentation's date: 2011-09-13
    Presentation of work at congresses

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    A continuum model capable of modelling the inelastic behaviour of masonry is presented. The model includes the description of viscoelasticity, orthotropic damage and tensile crack localization. The theoretical framework is summarized. The model has been implemented in a FE package and validated through the analysis of a complex masonry construction and the simulation of experimental tests on shear walls.

  • Mesh objective modeling of cracks using continuous linear strain and displacement interpolations

     Cervera Ruiz, Miguel; Chiumenti, Michele; Codina Rovira, Ramon
    International journal for numerical methods in engineering
    Date of publication: 2011-09
    Journal article

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  • Continuum damage model for orthotropic materials: application to masonry

     Pelà, Luca; Cervera Ruiz, Miguel; Roca Fabregat, Pedro
    Computer methods in applied mechanics and engineering
    Date of publication: 2011-02
    Journal article

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  • Structural analysis of masonry historical constructions: classical and advanced approaches

     Roca Fabregat, Pedro; Cervera Ruiz, Miguel; Gariup, Giuseppe; Pelà, Luca
    Archives of computational methods in engineering
    Date of publication: 2010-09
    Journal article

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  • On the computational modeling of FSW processes

     Agelet de Saracibar Bosch, Carlos; Chiumenti, Michele; Santiago, Diego; Cervera Ruiz, Miguel; Dialami, Narges; Lombera, Guillermo
    International Symposium on Plasticity and its Current Applications
    Presentation's date: 2010-01
    Presentation of work at congresses

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    This work deals with the computational modeling and numerical simulation of Friction Stir Welding (FSW) processes. Here a quasi-static, transient, mixed stabilized Eulerian formulation is used. Norton-Hoff and Sheppard-Wright rigid thermoplastic material models have been considered. A product formula algorithm, leading to a staggered solution scheme, has been used. The model has been implemented into the in-house developed FE code COMET. Results obtained in the simulation of FSW process are compared to other numerical results available.

  • A computational model for the numerical simulation of FSW processes

     Agelet de Saracibar Bosch, Carlos; Chiumenti, Michele; Santiago, Diego; Cervera Ruiz, Miguel; Dialami, Narges; Lombera, Guillermo
    International Conference on Numerical Methods in Industrial Forming Processes
    Presentation's date: 2010-06
    Presentation of work at congresses

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    In this paper a computational model for the numerical simulation of Friction Stir Welding (FSW) processes is presented. FSW is a new method of welding in solid state in which a shouldered tool with a profile probe is rotated and slowly plunged into the joint line between two pieces of sheet or plate material which are butted together. Once the probe has been completely inserted, it is moved with a small tilt angle in the welding direction. Here a quasi-static, thermal transient, mixed multiscale stabilized Eulerian formulation is used. Norton-Hoff and Sheppard-Wright rigid thermoviscoplastic material models have been considered. A staggered solution algorithm is defined such that for any time step, the mechanical problem is solved at constant temperature and then the thermal problem is solved keeping constant the mechanical variables. A pressure multiscale stabilized mixed linear velocity/linear pressure finite element interpolation formulation is used to solve the mechanical problem and a convection multiscale stabilized linear temperature interpolation formulation is used to solve the thermal problem. The model has been implemented into the in-house developed FE code COMET. Results obtained in the simulation of FSW process are compared to other numerical results or experimental results, when available.

  • FEM analysis of orthotropic masonry walls via localized damage models

     Pelà, Luca; Cervera Ruiz, Miguel; Roca Fabregat, Pedro
    International Masonry Conference
    Presentation's date: 2010-07-05
    Presentation of work at congresses

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    In finite element analysis of masonry structures, continuum damage models are generally combined with a smeared description of damage. This common approach however, fails to provide a realistic simulation of damage and only affords general information on expected damage levels. Moreover, spurious mesh-size and mesh-bias dependence emerges from the discrete problem. In order to overcome these drawbacks, this work proposes a smeared model modified in such a way that it can reproduce localized individual (discrete) cracks. This is achieved by means of a crack tracking algorithm, which enforces the crack to develop along a single row of finite elements. In addition, the material orthotropic behaviour is simulated making use of the concept of mapped stress and strain tensors from the anisotropic real space to a scaled isotropic one. This original methodology establishes a one-to-one mapping relationship between the behaviour of the anisotropic material and that of a corresponding scaled isotropic one. In this way, the problem is solved in scaled space and the results are mapped back onto the anisotropic field, with consequent advantages from the computational point of view. The validity of the model is demonstrated through the comparison between the numerical results and the experimental evidence observed on an in-plane loaded masonry wall.

  • Finite element modeling of multi-pass welding and shaped metal deposition processes

     Chiumenti, Michele; Cervera Ruiz, Miguel; Salmi, Alessandro; Agelet de Saracibar Bosch, Carlos; Dialami, Narges; Matsui, Kazumi
    Computer methods in applied mechanics and engineering
    Date of publication: 2010-08-01
    Journal article

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  • Un modelo para la simulación cinemática de la caída de bloques rocosos

     Ruiz Gandullo, Javier
    Defense's date: 2010-06-18
    Universitat Politècnica de Catalunya
    Theses

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  • Stabilized Finite Element Approximation of the Incompressible MHD Equations  Open access

     HERNÁNDEZ SILVA, NOEL
    Defense's date: 2010-07-12
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
    Theses

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    No es frecuente encontrar un campo donde dos ramas principales de la Física estén involucradas. La Magnetohidrodinámica es uno de tales campos debido a que involucra a la Mecánica de Fluidos y al Electromagnetismo. Aun cuando puede parecer que esas dos ramas de la Física tienen poco en común, comparten similitudes en las ecuaciones que gobiernan los fenómenos involucrados en ellas. Las ecuaciones de Navier-Stokes y las ecuaciones de Maxwell, ambas en la raíz de la Magnetohidrodinámica, tienen una condición de divergencia nula y es esta condición de divergencia nula sobre la velocidad del fluido y el campo magnético lo que origina algunos de los problemas numéricos que surgen en la modelación de los fenómenos donde el flujo de fluidos y los campos magnéticos están acoplados.El principal objetivo de este trabajo es desarrollar un algoritmo eficiente para la resolución mediante elementos finitos de las ecuaciones de la Magnetohidrodinámica de fluidos incompresibles.Para lograr esta meta, los conceptos básicos y las características de la Magnetohidrodinámica se presentan en una breve introducción informal.A continuación, se da una revisión completa de las ecuaciones de gobierno de la Magnetohidrodinámica, comenzando con las ecuaciones de Navier-Stokes y las ecuaciones de Maxwell. Se discute la aproximación que da origen a las ecuaciones de la Magnetohidrodinámica y finalmente se presentan las ecuaciones de la Magnetohidrodinámica.Una vez que las ecuaciones de gobierno de la Magnetohidrodinámica han sido definidas, se presentan los esquemas numéricos desarrollados, empezando con la linealización de las ecuaciones originales, la formulación estabilizada y finalmente el esquema numérico propuesto. En esta etapa se presenta una prueba de convergencia.Finalmente, se presentan los ejemplos numéricos desarrollados durante este trabajo.Estos ejemplos pueden dividirse en dos grupos: ejemplos numéricos de comparación y ejemplos de internes tecnológico. Dentro del primer grupo están incluidas simulaciones del flujo de Hartmann y del flujo sobre un escalón. El segundo grupo incluye simulaciones del flujo en una tobera de inyección de colada continua y el proceso Czochralski de crecimiento de cristales.

    It is not frequent to find a field where two major branches of Physics are involved. Magnetohydrodynamics is one of such fields because it involves Fluid Mechanics and Electromagnetism. Although those two branches of Physics can seem to have little in common, they share similarities in the equations that govern the phenomena involved. The Navier-Stokes equations and the Maxwell equations, both at the root of Magnetohydrodynamics, have a divergence free condition and it is this divergence free condition over the velocity of the fluid and the magnetic field what gives origin to some of the numerical problems that appear when approximating the equations that model the phenomena where fluids flow and magnetic fields are coupled.The main objective of this work is to develop an efficient finite element algorithm for the incompressible Magnetohydrodynamics equations.In order to achieve this goal the basic concepts and characteristics of Magnetohydrodynamics are presented in a brief and informal introduction.Next, a full review of the governing equations of Magnetohydrodynamics is given, staring from the Navier-Stokes equations and the Maxwell equations. The MHD approximation is discussed at this stage and the proper Magnetohydrodynamics equations for incompressible fluid are reviewed.Once the governing equations have been defined, the numerical schemes developed are presented, starting with the linearization of the original equations, the stabilization formulations and finally the numerical scheme proposed. A convergence test is shown at this stage.Finally, the numerical examples performed while this work was developed are presented. These examples can be divided in two groups: numerical benchmarks and numerical examples of technological interest. In the first group, the numerical simulations for the Hartmann flow and the flow over a step are included. The second group includes the simulation of the clogging in a continuous casting nozzle and Czochralski crystal growth process.

  • El método de los elementos finitos : volumen 3 : dinámica de fluidos

     Zienkiewicz, Olgierd Cecil; TAYLOR, R.L.; Nithiarasu, Perumal
    Date of publication: 2010-01-29
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  • El método de los elementos finitos : volumen 2 : mecánica de sólidos

     Zienkiewicz, Olgierd Cecil; TAYLOR, R.L.
    Date of publication: 2010-01-29
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  • El método de los elementos finitos : volumen 1 : las bases

     Zienkiewicz, Olgierd Cecil; TAYLOR, R.L.; Zhu, J. Z.
    Date of publication: 2010-01-29
    Book

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  • Mixed stabilized finite element methods in nonlinear solid mechanics: part II: strain localization

     Cervera Ruiz, Miguel; Chiumenti, Michele; Codina Rovira, Ramon
    Computer methods in applied mechanics and engineering
    Date of publication: 2010-08
    Journal article

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  • A crack-tracking technique for localized damage in quasi-brittle materials

     Cervera Ruiz, Miguel; Pelà, Luca; Clemente, Roberto; Roca Fabregat, Pedro
    Engineering fracture mechanics
    Date of publication: 2010-09
    Journal article

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  • Mixed stabilized finite element methods in nonlinear solid mechanics: part I: formulation

     Cervera Ruiz, Miguel; Chiumenti, Michele; Codina Rovira, Ramon
    Computer methods in applied mechanics and engineering
    Date of publication: 2010-08-01
    Journal article

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  • Size effect and localization in J2 plasticity

     Cervera Ruiz, Miguel; Chiumenti, Michele
    International journal of solids and structures
    Date of publication: 2009-08
    Journal article

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  • A strategy for the numerical simulation of metal deposition and multi-pass welding processes

     Dialami, Narges; Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel
    International Conference on Computational Plasticity Fundamentals and Applications
    Presentation's date: 2009-09
    Presentation of work at congresses

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    In this work a numerical model is developed to accurately predict temperature evolution and distortions associated to the successive welding layers deposited during the multi-pass welding and metal deposition processes (MD).

  • Coupled thermo-mechanical analysis for the numerical simulation of welding processes

     Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos
    International Conference on Computational Methods for Coupled Problems in Science and Engineering
    Presentation's date: 2009-06
    Presentation of work at congresses

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    The aim of this paper consists of both the description of the formulation adopted for the numerical simulation of the Metal Deposition process (MD) and the experimental work carried out at ITP Industry (Industria de Turbo Propulsores, SA, Spain). MD process consists of a manufacturing technology similar to the multi-pass welding used for building features such as bosses and flanges on fabricated components. A fully coupled thermo-mechanical solution is considered including phase-change phenomena defined in terms of latent heat release and shrinkage effects. Temperature evolution as well as residual stresses and distortions due to the successive welding layers are accurately studied coupling the heat transfer analysis together with the mechanical field. The material behaviour is characterized by a thermo-elasto-viscoplastic constitutive model (at macro-level) coupled with a metallurgical model (at micro-level). Nickel super-alloy 718 is the target material of this work. Both heat convection and heat radiation models are introduced to dissipate heat through the boundaries. An in-house developed coupled FE software was the starting point to deal with the simulation and an ad-hoc activation methodology has been implemented to simulate the deposition of the different layers of melted material. Thermo-mechanical results are presented in terms of temperature evolution, residual stresses generated and distortions compared with the experimental data obtained at the MD laboratories of ITP. Difficulties and simplifying hypotheses are discussed.

  • Access to the full text
    Optimal kinematics for finite elements with smeared-embedded discontinuity  Open access

     Wu, J.Y.; Cervera Ruiz, Miguel
    International Conference on Computational Plasticity Fundamentals and Applications
    Presentation's date: 2009
    Presentation of work at congresses

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    In this paper an optimal kinematics for finite elements with smeared non-uniform discontinuity/crack is proposed to eliminate the spurious stress transfer across a fully softened crack (i.e. stress locking). We first present the optimal kinematics of the finite elements with embedded non-uniform displacement jumps. It is found that, if the regularization bandwidth of the strong discontinuity reaches a critical value, i.e. the so-called consistent characteristic length of an element, the concept of classical smeared crack model is recovered. The optimal definition of the smeared cracking (inelastic) strain is then established such that the stress locking is completely removed. Finally, a constant stress triangle with a non-uniform discontinuity is analytically solved. The prediction shows that finite elements with the proposed kinematics can capture the expected stress and strain states even if a smeared crack model is used.

  • Continuum Damage Model for Nonlinear Analysis of Masonry Structures.

     Pelà, Luca
    Defense's date: 2009-03-26
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
    Theses

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  • GRUP DE RESISTÈNCIA DE MATERIALS I ESTRUCTURES A L'ENGINYERIA

     Chiumenti, Michele; Hernandez Ortega, Joaquin Alberto; Oller Martinez, Sergio Horacio; Agelet de Saracibar Bosch, Carlos; Badia Rodriguez, Santiago I.; González Lopez, Jose Manuel; Weyler Perez, Rafael; Codina Rovira, Ramon; Bugeda Castelltort, Gabriel; Barbat Barbat, Horia Alejandro; Cante Teran, Juan Carlos; Baiges Aznar, Joan; Davalos Chargoy, Cesar Emilio; Miquel Canet, Juan; Suarez Arroyo, Benjamin; Cervera Ruiz, Miguel; Pelà, Luca; Oliver Olivella, Fco. Javier
    Participation in a competitive project

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  • On the numerical modeling of the thermomechanical contact for metal casting analysis

     Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel
    Journal of heat transfer . Transactions of the ASME
    Date of publication: 2008-06
    Journal article

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  • Sobre representaciones gráficas para análisis multicriterio

     Robuste Anton, Francesc; Garola Crespo, Alvaro; Cervera Ruiz, Miguel; López Lambas, Maria Eugenia
    Congreso de Ingeniería del Transporte
    Presentation's date: 2008-07
    Presentation of work at congresses

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  • MAGnesium New technological Opportunities (MAGNO)

     Cervera Ruiz, Miguel; Llorca Pique, Jordi
    Participation in a competitive project

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  • Un modelo de daño ortótropo para el análisis de estructuras históricas en obra de fábrica

     Pelà, Luca; Cervera Ruiz, Miguel; Pere, Roca; Roca Fabregat, Pedro; Benedetti, Andrea
    I Congreso Iberoamericano sobre Construcciones Históricas y Estructuras de Mampostería
    Presentation of work at congresses

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  • Thermo-mechanical modeling of multi¿pass welding and metal deposition processes

     Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos
    World Congress on Computational Mechanis and European Congres on Computational Methods in Applied Sciences and Engineering
    Presentation of work at congresses

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  • An orthotropic damage model for the analysis of masonry structures

     Pelà, Luca; Cervera Ruiz, Miguel; Pere, Roca; Roca Fabregat, Pedro; Benedetti, Andrea
    International Seminar on Structural Masonry
    Presentation's date: 2008-11-07
    Presentation of work at congresses

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