Exploració per autor "Abdollahi Hosnijeh, Amir"
Ara es mostren els items 9-24 de 24
-
Ferroelectrics as smart mechanical materials
Cordero Edwards, Kumara; Domingo Marimon, Neus; Abdollahi Hosnijeh, Amir; Sort Viñas, Jordi; Catalan, Gustau (2017-07-21)
Article
Accés obertThe mechanical properties of materials are insensitive to space inversion, even when they are crystallographically asymmetric. In practice, this means that turning a piezoelectric crystal upside down or switching the ... -
Flexoelectric MEMS: towards an electromechanical strain diode
Bhaskar, Umesh Kumar; Banerjee, Nirupam; Abdollahi Hosnijeh, Amir; Solanas, E.; Rijnders, Guus; Catalan, Gustau (2016)
Article
Accés obertPiezoelectricity and flexoelectricity are two independent but not incompatible forms of electromechanical response exhibited by nanoscale ferroelectrics. Here, we show that flexoelectricity can either enhance or suppress ... -
Flexoelectricity in bones
Vazquez Sancho, Fabian; Abdollahi Hosnijeh, Amir; Damjanovic, Dragan; Catalan, Gustau (2018-01-18)
Article
Accés obertones generate electricity under pressure, and this electromechanical behavior is thought to be essential for bone's self-repair and remodeling properties. The origin of this response is attributed to the piezoelectricity ... -
Fracture toughening and toughness asymmetry induced by flexoelectricity
Abdollahi Hosnijeh, Amir; Peco, Christian; Millán, Daniel; Arroyo Balaguer, Marino; Catalan, Gustau; Arias Vicente, Irene (2015-09-08)
Article
Accés restringit per política de l'editorialCracks generate the largest strain gradients that any material can withstand. Flexoelectricity (coupling between strain gradient and polarization) must therefore play an important role in fracture physics. Here we use a ... -
Modeling and simulation of conducting crack propagation in ferroelectric single crystals under purely electrical loading
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (CIMNE, 2013)
Text en actes de congrés
Accés obertWe present a phase-field model of fracture in ferroelectric single crystals for the simulation of conducting crack propagation under purely electrical loading. This is done by introducing the electrical enthalpy of a diffuse ... -
Modeling and simulation of conducting crack propagation in ferroelectric single crystals under purely electrical loading
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2013)
Text en actes de congrés
Accés obertWe present a phase-field model of fracture in ferroelectric single crystals for the simulation of conducting crack propagation under purely electrical loading. This is done by introducing the electrical enthalpy of a diffuse ... -
Numerical simulation of intergranular and transgranular crack propagation in ferroelectric polycrystals
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2011)
Text en actes de congrés
Accés restringit per política de l'editorialWe 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) ... -
Numerical simulations of vickers indentation crack growth in ferroelectric single crystals: effect of microstructure on the fracture process
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (CIMNE, 2011)
Text en actes de congrés
Accés obertFerroelectric materials exhibit strong electro-mechanical coupling which make them ideal materials for use in electro-mechanical devices such as sensors, actuators and transducers. To assure optimum reliability of these ... -
Phase-field modeling of crack propagation in piezoelectric and ferroelectric materials with different electromechanical crack conditions
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2012-12)
Article
Accés obertWe present a family of phase-field models for fracture in piezoelectric and ferroelectric materials. These models couple a variational formulation of brittle fracture with, respectively, (1) the linear theory of piezoelectricity, ... -
Phase-field modeling of fracture in ferroelectric materials
Abdollahi Hosnijeh, Amir (Universitat Politècnica de Catalunya, 2012-10-18)
Tesi
Accés obertThe unique electro-mechanical coupling properties of ferroelectrics make them ideal materials for use in micro-devices as sensors, actuators and transducers. Nevertheless, because of the intrinsic brittleness of ferroelectrics, ... -
Phase-field modeling of fracture in ferroelectric materials
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2015-04-01)
Article
Accés obertThis paper presents a family of phase-field models for the coupled simulation of the microstructure formation and evolution, and the nucleation and propagation of cracks in single and polycrystalline ferroelectric materials. ... -
Phase-field modeling of the coupled microstructure and fracture evolution in ferroelectric single crystals
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2011-07)
Article
Accés restringit per política de l'editorialWe 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 ... -
Phase-field simulation of anisotropic crack propagation in ferroelectric single crystals: effect of microstructure on the fracture process
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2011)
Article
Accés obertCrack propagation during the indentation test of a ferroelectric single crystal is simulated using a phase- eld model. This model is based on variational formulations of brittle crack propagation and domain evolution in ... -
Piezoelectric mimicry of flexoelectricity
Abdollahi Hosnijeh, Amir; Vazquez Sancho, Fabian; Catalan, Gustau (American Institute of Physics (AIP), 2018-11-15)
Article
Accés obertThe origin of “giant” flexoelectricity, orders of magnitude larger than theoretically predicted, yet frequently observed, is under intense scrutiny. There is mounting evidence correlating giant flexoelectriclike effects ... -
Revisiting pyramid compression to quantify flexoelectricity: a three-dimensional simulation study
Abdollahi Hosnijeh, Amir; Millán, Daniel; Peco, Christian; Arroyo Balaguer, Marino; Arias Vicente, Irene (2015-03-03)
Article
Accés obertFlexoelectricity is a universal property of all dielectrics by which they generate a voltage in response to an inhomogeneous deformation. One of the controversial issues in this field concerns the magnitude of flexoelectric ... -
Three-dimensional simulation of crack propagation in ferroelectric polycrystals: Effect of combined toughening mechanisms
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2014-02-15)
Article
Accés restringit per política de l'editorialWe simulate the fracture processes of ferroelectric polycrystals in three dimensions using a phase-field model. In this model, the grain boundaries, cracks and ferroelectric domain walls are represented in a diffuse way ...