Cervera Ruiz, Miguel
Total activity: 389
Areas of 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
Scopus Author ID
7102347663 Open in new window
Collaborative networks
Links of interest
ResearchGate Open in new window
personal web-page Open in new window

Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 389 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
    Vol. 21, num. 1, p. 3-37
    DOI: 10.1007/s11831-014-9094-z
    Date of publication: 2014-03
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • A localized mapped damage model for orthotropic materials

     Pelà, Luca; Cervera Ruiz, Miguel; Oller Martinez, Sergio Horacio; Chiumenti, Michele
    Engineering fracture mechanics
    Vol. 124-125, p. 196-216
    DOI: 10.1016/j.engfracmech.2014.04.027
    Date of publication: 2014-05-08
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    This paper presents an implicit orthotropic model based on the Continuum Damage Mechanics isotropic models. A mapping relationship is established between the behaviour of the anisotropic material and that of an isotropic one. The proposed model is used to simulate the failure loci of common orthotropic materials, such as masonry, fibre-reinforced composites and wood. The damage model is combined with a crack-tracking technique to reproduce the propagation of localized cracks in the discrete FE problem. The proposed numerical model is used to simulate the mixed mode fracture in masonry members with different orientations of the brick layers.

    This paper presents an implicit orthotropic model based on the Continuum Damage Mechanics isotropic models. A mapping relationship is established between the behaviour of the anisotropic material and that of an isotropic one. The proposed model is used to simulate the failure loci of common orthotropic materials, such as masonry, fibre-reinforced composites and wood. The damage model is combined with a crack-tracking technique to reproduce the propagation of localized cracks in the discrete FE problem. The proposed numerical model is used to simulate the mixed mode fracture in masonry members with different orientations of the brick layers.

  • Comparison of a fluid and a solid approach for the numerical simulation of friction stir welding with a non-cylindrical pin

     Bussetta, Philippe; Dialami, Narges; Boman, Romain; Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel; Ponthot, Jean Philippe
    Steel research international
    Vol. 85, num. 6, p. 968-979
    DOI: 10.1002/srin.201300182
    Date of publication: 2014-06
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Friction stir welding (FSW) process is a solid-state joining process during which materials to be joined are not melted. As a consequence, the heat-affected zone is smaller and the quality of the weld is better with respect to more classical welding processes. Because of extremely high strains in the neighborhood of the tool, classical numerical simulation techniques have to be extended in order to track the correct material deformations. The Arbitrary Lagrangian-Eulerian (ALE) formulation is used to preserve a good mesh quality throughout the computation. With this formulation, the mesh displacement is independent from the material displacement. Moreover, some advanced numerical techniques such as remeshing or a special computation of transition interface is needed to take into account non-cylindrical tools. During the FSW process, the behavior of the material in the neighborhood of the tool is at the interface between solid mechanics and fluid mechanics. Consequently, a numerical model of the FSW process based on a solid formulation is compared to another one based on a fluid formulation. It is shown that these two formulations essentially deliver the same results in terms of pressures and temperatures.

  • Thermo-mechanical analysis of welding processes

     Dialamishabankareh, Narges
    Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract  Share Reference managers Reference managers Open in new window

    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
    Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract  Share Reference managers Reference managers Open in new window

    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.

  • Continuum FE models for the analysis of Mallorca Cathedral

     Roca Fabregat, Pedro; Cervera Ruiz, Miguel; Pelà, Luca; Clemente, Roberto; Chiumenti, Michele
    Engineering structures
    Vol. 46, p. 653-670
    DOI: 10.1016/j.engstruct.2012.08.005
    Date of publication: 2013
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • 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
    Vol. 254, p. 353-369
    DOI: 10.1016/j.cma.2012.09.013
    Date of publication: 2013-02
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    Vol. 117, p. 48-57
    DOI: 10.1016/j.compstruc.2012.12.006
    Date of publication: 2013-02
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • An orthotropic damage model for the analysis of masonry structures

     Pelà, Luca; Cervera Ruiz, Miguel; Roca Fabregat, Pedro
    Construction & building materials
    Vol. 41, p. 957-967
    DOI: 10.1016/j.conbuildmat.2012.07.014
    Date of publication: 2013-05
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • Shaped metal deposition processes

     Agelet de Saracibar Bosch, Carlos; Lundbäck, Andreas; Chiumenti, Michele; Cervera Ruiz, Miguel
    DOI: 10.1007/978-94-007-2739-7
    Date of publication: 2013-08
    Book chapter

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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)

  • Integrative Computational Materials Engineering Expert Group (ICMEg)

     Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel
    Competitive project

     Share

  • 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
    p. 45-56
    DOI: 10.1063/1.4806808
    Presentation's date: 2013-07
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • 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
    Vol. 241-244, p. 206-224
    DOI: 10.1016/j.cma.2012.06.002
    Date of publication: 2012-10-01
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    Vol. 6, num. Suppl 1-M7, p. 188-199
    DOI: 10.2174/1874149501206010188
    Date of publication: 2012-11-23
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • 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
    Book

     Share Reference managers Reference managers Open in new window

  • Distincio Jaume Vicenç Vives

     Cervera Ruiz, Miguel
    Award or recognition

    View View Open in new window  Share

  • 15è. Premi UPC a la Qualitat en la Docència Universitària

     Cervera Ruiz, Miguel
    Award or recognition

    View View Open in new window  Share

  • Project title: Robust and Flexible Cast Iron Manufacturing (FLEXICAST)

     Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel
    Competitive project

     Share

  • Structural assessment of Mallorca Cathedral

     Roca Fabregat, Pedro; Cervera Ruiz, Miguel; Pelà, Luca; Clemente, Roberto; Chiumenti, Michele
    Structural Analysis of Historical Constructions
    p. 359-367
    Presentation's date: 2012-10-15
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    p. 1-10
    Presentation's date: 2012-06-04
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • Continuum damage model for orthotropic materials: application to masonry

     Pelà, Luca; Cervera Ruiz, Miguel; Roca Fabregat, Pedro
    Computer methods in applied mechanics and engineering
    Vol. 200, num. 9-12, p. 917-930
    DOI: 10.1016/j.cma.2010.11.010
    Date of publication: 2011-02
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    Vol. 87, num. 10, p. 962-987
    DOI: 10.1002/nme.3148
    Date of publication: 2011-09
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Numerical simulation of transient temperature and plastic dissipation in Friction Stir Welding

     Dialami, Narges; Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos
    International Conference on Computational Plasticity Fundamentals and Applications
    p. 1
    Presentation's date: 2011-09
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Coupled thermo-mechanical analysis for Frictional Stir Welding processes

     Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos; Dialami, Narges
    International Conference on Computacional Methods for Coupled Problems in Science and Engineering
    p. 1
    Presentation's date: 2011-06
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • On the numerical simulation of 3D Friction Stir Welding processes

     Agelet de Saracibar Bosch, Carlos; Chiumenti, Michele; Cervera Ruiz, Miguel; Dialami, Narges; Santiago, Diego; Lombera, Guillermo
    International Conference on Computacional Methods for Coupled Problems in Science and Engineering
    p. 1
    Presentation's date: 2011-06
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • A novel FE approach to strain localization problems based on a three field formulation

     Chiumenti, Michele; Cervera Ruiz, Miguel; Codina Rovira, Ramon
    International Conference on Computational Plasticity Fundamentals and Applications
    p. 1
    Presentation's date: 2011-09-08
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    p. 1-20
    Presentation's date: 2011-06-15
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Access to the full text
    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
    p. 1-10
    Presentation's date: 2011-09-13
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • 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
    p. 1-3
    Presentation's date: 2011-01
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • Numerical simultation of transient temperature and plastic dissipation in fricction stir welding

     Dialami, Narges; Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos
    International Conference on Computational Plasticity Fundamentals and Applications
    p. 1
    Presentation's date: 2011-09
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    Vol. 199, num. 37-40, p. 2571-2589
    DOI: 10.1016/j.cma.2010.04.005
    Date of publication: 2010-08
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

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

     Cervera Ruiz, Miguel; Pelà, Luca; Clemente, Roberto; Roca Fabregat, Pedro
    Engineering fracture mechanics
    Vol. 77, num. 13, p. 2431-2450
    DOI: 10.1016/j.engfracmech.2010.06.013
    Date of publication: 2010-09
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    Vol. 199, num. 37-40, p. 2559-2570
    DOI: 10.1016/j.cma.2010.04.006
    Date of publication: 2010-08-01
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    Vol. 199, num. 37-40, p. 2343-2359
    DOI: 10.1016/j.cma.2010.02.018
    Date of publication: 2010-08-01
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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

     Share Reference managers Reference managers Open in new window

  • Casting of Large Ti Structures (COLTS)

     Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel
    Competitive project

     Share

  • 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
    Book

     Share Reference managers Reference managers Open in new window

  • El método de los elementos finitos : volumen 2 : mecánica de sólidos

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

     Share Reference managers Reference managers Open in new window

  • 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
    Vol. 17, num. 3, p. 299-325
    DOI: 10.1007/s11831-010-9046-1
    Date of publication: 2010-09
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    p. 1-3
    Presentation's date: 2010-01
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • Numerical simulation of food preservation processes

     Chiumenti, Michele; Agelet de Saracibar Bosch, Carlos; Cervera Ruiz, Miguel
    Congreso Internacional de Métodos Numéricos en Ingeniería
    p. 1
    Presentation's date: 2010-02
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • 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
    p. 81-88
    DOI: 10.1063/1.3457640
    Presentation's date: 2010-06
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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
    p. 217-226
    Presentation's date: 2010-07-05
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

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

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

     Share

  • Comportamiento no-lineal de materiales compuestos multilaminados, considerando la delaminación (DELCOM)

     Barbat Barbat, Horia Alejandro; Oller Martinez, Sergio Horacio; Cervera Ruiz, Miguel; Martinez Garcia, Xavier; Rastellini Canela, Fernando Gabriel; Mata Almonacid, Pablo
    Competitive project

     Share

  • Continuum Damage Model for Nonlinear Analysis of Masonry Structures.

     Pelà, Luca
    Department of Strength of Materials and Structural Engineering, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Size effect and localization in J2 plasticity

     Cervera Ruiz, Miguel; Chiumenti, Michele
    International journal of solids and structures
    Vol. 46, num. 17, p. 3301-3312
    Date of publication: 2009-08
    Journal article

     Share Reference managers Reference managers Open in new window

  • 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
    p. 1-6
    Presentation's date: 2009-06
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    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.

  • Fully coupled thermo-mechanical analysis of multi-pass welding and metal deposition processes

     Dialami, Narges; Chiumenti, Michele; Cervera Ruiz, Miguel; Agelet de Saracibar Bosch, Carlos
    Congreso de Métodos Numéricos en Ingeniería
    p. 505
    Presentation's date: 2009-07
    Presentation of work at congresses

    View View Open in new window  Share Reference managers Reference managers Open in new window