Exploració per autor "Abdollahi Hosnijeh, Amir"
Ara es mostren els items 1-20 de 24
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A flexoelectric microelectromechanical system on silicon
Bhaskar, Umesh Kumar; Banerjee, Nirupam; Abdollahi Hosnijeh, Amir; Wang, Zhen; Scholm, Darrell G.; Rijnders, Guus; Catalan, Gustau (2016)
Article
Accés obertFlexoelectricity allows a dielectric material to polarize in response to a mechanical bending moment and, conversely, to bend in response to an electric field. Compared with piezoelectricity, flexoelectricity is a weak ... -
A phase-field fracture model of ferroelectric materials under electro-mechanical loading
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2011)
Text en actes de congrés
Accés restringit per política de l'editorialA 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 ... -
An efficacious method to assemble a modern multi-modal robotic team: dilemmas, challenges, possibilities and solutions
Abdollahi Hosnijeh, Amir; Samani, Hooman Aghaebrahimi (Daisuke Chugo, Sho Yokota, 2012-01-05)
Capítol de llibre
Accés obertA modern multiagent robotic platform consists of a cooperative team of humans which develop a collaborative team of robots. The multi-modal nature of both the system and the team causes a complex problem which needs to ... -
Computational evaluation of the flexoelectric effect in dielectric solids
Abdollahi Hosnijeh, Amir; Peco Regales, Christian; Millán, Daniel; Arroyo Balaguer, Marino; Arias Vicente, Irene (American Institute of Physics (AIP), 2014-09-07)
Article
Accés restringit per política de l'editorialFlexoelectricity is a size-dependent electromechanical mechanism coupling polarization and strain gradient. It exists in a wide variety of materials, and is most noticeable for nanoscale objects, where strain gradients are ... -
Conducting crack propagation driven by electric fields in ferroelectric ceramics
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2013-11)
Article
Accés restringit per política de l'editorialFerroelectric 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 ... -
Constructive and destructive interplay between piezoelectricity and flexoelectricity in flexural sensors and actuators
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2015)
Article
Accés obertFlexoelectricity is an electromechanical effect coupling polarization to strain gradients. It fundamentally differs from piezoelectricity because of its size-dependence and symmetry. Flexoelectricity is generally perceived ... -
Converse flexoelectricity yields large piezoresponse force microscopy signals in non-piezoelectric materials
Abdollahi Hosnijeh, Amir; Domingo, Neus; Arias Vicente, Irene; Catalan, Gustau (2019-03-20)
Article
Accés obertConverse flexoelectricity is a mechanical stress induced by an electric polarization gradient. It can appear in any material, irrespective of symmetry, whenever there is an inhomogeneous electric field distribution. This ... -
Crack initiation patterns at electrode edges in multilayer ferroelectric actuators
Abdollahi Hosnijeh, Amir; Arias Vicente, Irene (2012-12)
Article
Accés obert -
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 ...