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1 to 20 of 20 results
  • Conducting crack propagation driven by electric fields in ferroelectric ceramics

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    Acta materialia
    Date of publication: 2013-11
    Journal article

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    Ferroelectric ceramics are susceptible to fracture under high electric fields, which are commonly generated in the vicinity of electrodes or conducting layers. In the present work, we extend a phase-field model of fracture in ferroelectric single crystals to the simulation of the propagation of conducting cracks under purely electrical loading. This is done by introducing the electrical enthalpy of a diffuse conducting layer into the phase-field formulation. Simulation results show oblique crack propagation and crack branching from a conducting notch, forming a tree-like crack pattern in a ferroelectric sample under positive and negative electric fields. Microstructure evolution indicates the formation of tail-to-tail and head-to-head 90° domains, which results in charge accumulation around the crack. The charge accumulation, in turn, induces a high electric field and hence a high electrostatic energy, further driving the conducting crack. Salient features of the results are compared with experiments.

    Ferroelectric ceramics are susceptible to fracture under high electric fields, which are commonly generated in the vicinity of electrodes or conducting layers. In the present work, we extend a phase-field model of fracture in ferroelectric single crystals to the simulation of the propagation of conducting cracks under purely electrical loading. This is done by introducing the electrical enthalpy of a diffuse conducting layer into the phase-field formulation. Simulation results show oblique crack propagation and crack branching from a conducting notch, forming a tree-like crack pattern in a ferroelectric sample under positive and negative electric fields. Microstructure evolution indicates the formation of tail-to-tail and head-to-head 90° domains, which results in charge accumulation around the crack. The charge accumulation, in turn, induces a high electric field and hence a high electrostatic energy, further driving the conducting crack. Salient features of the results are compared with experiments.

  • Phase-field modeling of crack propagation in piezoelectric and ferroelectric materials with different electromechanical crack conditions

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    Journal of the mechanics and physics of solids
    Date of publication: 2012-12
    Journal article

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  • Crack initiation patterns at electrode edges in multilayer ferroelectric actuators

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    Smart materials and structures
    Date of publication: 2012-12
    Journal article

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  • Numerical simulation of intergranular and transgranular crack propagation in ferroelectric polycrystals

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    International journal of fractures
    Date of publication: 2012-01-17
    Journal article

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  • Phase-field modeling of fracture in ferroelectric materials.

     Abdollahi Hosnijeh, Amir
    Defense's date: 2012-10-18
    Universitat Politècnica de Catalunya
    Theses

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  • MODELOS DE CAMPO DE FASE PARA PROBLEMAS DE DISCONTINUIDAD LIBRE: METODOS COMPUTACIONALES Y APLICACIONES EN FRACTURA MATERIALES FERRO

     Abdollahi Hosnijeh, Amir; Arroyo Balaguer, Marino; Li, Bin; Arias Vicente, Irene
    Participation in a competitive project

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  • Numerical simulation of intergranular and transgranular crack propagation in ferroelectric polycrystals

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    Congreso en Métodos Numéricos em Engenharia
    Presentation's date: 2011-06-15
    Presentation of work at congresses

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    We present a phase-field model to simulate intergranular and transgranular crack propagation in ferroelectric polycrystals. The proposed model couples three phase-fields describing (1) the polycrystalline structure, (2) the location of the cracks, and (3) the ferroelectric domain microstructure. Different polycrystalline microstructures are obtained from computer simulations of grain growth. Then, a phase-field model for fracture in ferroelectric single-crystals is extended to polycrystals by incorporating the differential fracture toughness of the bulk and the grain boundaries, and the different crystal orientations of the grains. Our simulation results show intergranular crack propagation in fine-grain microstructures, while transgranular crack propagation is observed in coarse grains. Crack deflection is shown as the main toughening mechanism in the fine-grain structure. Due to the ferroelectric domain switching mechanism, noticeable fracture toughness enhancement is also obtained for transgranular crack propagation. These observations agree with experiment.

    Postprint (author’s final draft)

  • Numerical simulations of Vickers indentation crack growth in ferroelectric single crystals: Effect of microstructure on the fracture process

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    International Conference on Computational Plasticity Fundamentals and Applications
    Presentation's date: 2011
    Presentation of work at congresses

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  • A phase-field fracture model of ferroelectric materials under electro-mechanical loading

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    Conference on Smart Materials, Adaptive Structures and Intelligent Systems
    Presentation's date: 2011-09
    Presentation of work at congresses

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    A phase-field model is proposed for the coupled simulation of microstructure and fracture evolution in ferroelectric materials. The model is based on energetic phase-field approaches for brittle fracture and ferroelectric domain formation and evolution. The variational nature of these approaches makes their coupling very natural. However the main challenge is to encode the electro-mechanical conditions of the sharp crack faces into the phase-field framework since the crack in this model is smeared and represented by an internal layer. We develope the model for different crack face boundary conditions. Simulations show the microstructure induced by the presence of the crack. Interactions between the microstructure and the crack are investigated under different electro-mechanical loadings.

  • Phase-field modeling of the coupled microstructure and fracture evolution in ferroelectric single crystals

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    Acta materialia
    Date of publication: 2011-07
    Journal article

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    We propose a phase-field model for the coupled simulation of microstructure formation and evolution, and the nucleation and propagation of cracks in single-crystal ferroelectric materials. The model naturally couples two existing energetic phase-field approaches for brittle fracture and ferroelectric domain formation and evolution. The finite-element implementation of the theory in two dimensions (plane-polarization and plane-strain) is described. We perform, to the best of our knowledge, the first crack propagation calculations of ferroelectric single crystals, simultaneously allowing general microstructures to develop. Previously, the microstructure calculations were performed at fixed crack configurations or under the assumption of small-scale switching. Our simulations show that this assumption breaks down as soon as the crack-tip field interacts with the boundaries of the test sample (or, in general, obstacles such as defects or grain boundaries). Then, the microstructure induced by the presence of the crack propagates beyond its vicinity, leading to the formation of twins. Interactions between the twins and the crack are investigated under mechanical and electromechanical loadings, both for permeable and impermeable cracks, with an emphasis on fracture toughening due to domain switching, and compared with experiments.

  • Phase-field simulation of anisotropic crack propagation in ferroelectric single crystals: Effect of microstructure on the fracture process

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    Modeling and simulation in materials science and engineering
    Date of publication: 2011
    Journal article

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  • Modelos de campo de fase para problemas de discontinuidad libre: métodos computacionales y aplicaciones en fractura, materiales..

     Arroyo Balaguer, Marino; Millan, Raul Daniel; Abdollahi Hosnijeh, Amir; Rosolen, Adrian Martin; Arias Vicente, Irene
    Participation in a competitive project

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  • A computational study of fracture in ferroelectric single crystals

     Abdollahi Hosnijeh, Amir; Arias Vicente, Irene
    International Conference on Computational Plasticity Fundamentals and Applications
    Presentation's date: 2009-09-24
    Presentation of work at congresses

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  • MÈTODES NUMÈRICS EN CIÈNCIES APLICADES I ENGINYERIA

     Roca Navarro, Francisco Javier; Giorgiani, Giorgio; Zlotnik, Sergio; Fernandez Mendez, Sonia; Rodriguez Ferran, Antonio; Muñoz Romero, Jose Javier; Arias Vicente, Irene; de Villardi de Montlaur, Adeline; Sarrate Ramos, Jose; Diez Mejia, Pedro; Arroyo Balaguer, Marino; Sevilla Cardenas, Ruben; Parés Mariné, Núria; Casoni Rero, Eva; Ruiz Girones, Eloi; Modesto Galende, David; Millan, Raul Daniel; Abdollahi Hosnijeh, Amir; Steffens, Lindaura Maria; Discacciati, Marco; Shen, Yongxing; Rahimi Lenji, Mohammad; Tamayo Mas, Elena; Diaz Cereceda, Cristina; Prat Robles, David; Verdugo Rojano, Francesc; Zhang, Kuan; Estela Carbonell, M. Rosa; Peco Regales, Christian; Huerta Cerezuela, Antonio
    Participation in a competitive project

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  • A practical approach to control and self-localization of an omni-directional mobile robot

     Ziai-Rad, Saeed; Janabi-Sharifi, Farid; Daneshpanah, Mehdi; Abdollahi Hosnijeh, Amir; Ostadi, Hossein; Samani, Hooman Aghaebrahimi
    Wseas Transactions on Systems and Control
    Date of publication: 2008
    Journal article

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  • Comprehensive omni-directional soccer player robots

     Abdollahi Hosnijeh, Amir; Daneshpanah, Mehdi; Ostadi, Hossein; Samani, Hooman Aghaebrahimi
    Date of publication: 2007-12-01
    Book chapter

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  • Evaluation on mass sensitivity of SAW sensors for different piezoelectric materials using finite element analysis

     Abdollahi Hosnijeh, Amir; Jiang, Zhongwei; Arabshahi, Sayyed Alireza
    IEEE transactions on Ultrasonics Ferroelectrics and Frequency control
    Date of publication: 2007
    Journal article

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    The mass sensitivity of the piezoelectric surface acoustic wave (SAW) sensors is an important factor in the selection of the best gravimetric sensors for different applications. To determine this value without facing the practical problems and the long theoretical calculation time, we have shown that the mass sensitivity of SAW sensors can be calculated by a simple three-dimensional (3-D) finite-element analysis (FEA) using a commercial finite-element platform. The FEA data are used to calculate the wave propagation speed, surface particle displacements, and wave energy distribution on different cuts of various piezoelectric materials. The results are used to provide a simple method for evaluation of their mass sensitivities. Meanwhile, to calculate more accurate results from FEA data, surface and bulk wave reflection problems are considered in the analyses. in this research, different cuts of lithium niobate, quartz, lithium tantalate, and langasite piezoelectric materials are applied to investigate their acoustic wave properties. Our analyses results for these materials have a good agreement with other researchers¿ results. Also, the mass sensitivity value for the novel cut of langasite was calculated through these analyses. It was found that its mass sensitivity is higher than that of the conventional Rayleigh mode quartz sensor.

  • Autodesk inventor 3D modeling software for mechanical engineers

     Abdollahi Hosnijeh, Amir
    Date of publication: 2005
    Book chapter

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  • A practical approach to control and self-localization of Persia Omni-Directional Mobile Robot

     Ziai-Rad, Saeed; Janabi-Sharifi, Farid; Daneshpanah, Mehdi; Abdollahi Hosnijeh, Amir; Ostadi, Hossein; Samani, Hooman Aghaebrahimi
    IEEE/RSJ International Conference on Intelligent Robots and Systems
    Presentation's date: 2005-02-10
    Presentation of work at congresses

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  • Design and development of a comprehensive omni directional soccer player robot

     Samani, Hooman Aghaebrahimi; Abdollahi Hosnijeh, Amir; Ostadi, Hossein; Ziai-Rad, Saeed
    International journal of advanced robotic systems
    Date of publication: 2004
    Journal article

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