Siamak Soleymani Shishvan

Siamak Soleymani Shishvan
University of Tabriz · Department of Civil Engineering

About

44
Publications
6,097
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514
Citations
Citations since 2017
29 Research Items
411 Citations
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140

Publications

Publications (44)
Article
The growth of voids at the electrode/electrolyte interface of a solid state Li battery is analysed by establishing a framework that uses the Onsager formalism to couple the power-law creep deformation of the Li electrode and flux of Li+ through a single-ion conductor solid electrolyte. For realistic combinations of the interfacial resistance and el...
Article
Composites such as architected metamaterials made from elastic materials can display energy absorbing or dissipative behavior associated with snap-through and other instabilities. These instabilities result in conversion of elastic strain energy of the elastic parent material of the composite to kinetic energy which is then dissipated over longer t...
Article
A new gradient-based formulation for predicting fracture in elastic-plastic solids is presented. Damage is captured by means of a phase field model that considers both the elastic and plastic works as driving forces for fracture. Material deformation is characterised by a mechanism-based strain gradient constitutive model. This non-local plastic-da...
Preprint
A new gradient-based formulation for predicting fracture in elastic-plastic solids is presented. Damage is captured by means of a phase field model that considers both the elastic and plastic works as driving forces for fracture. Material deformation is characterised by a mechanism-based strain gradient constitutive model. This non-local plastic-da...
Article
We analyse the initiation of void growth in the Li electrode during the stripping phase of an Li-ion cell with a solid (ceramic) electrolyte. We first show that standard Butler-Volmer kinetics fails to predict the observed void formation. This motivated us to recognise that void initiation/growth involves power-law creep of the Li electrode that is...
Article
Tensile and creep responses of Cu–Nb composites are predicted at 400°C using a high-temperature discrete dislocation plasticity (DDP) framework where the multilayer composites are idealized as two-dimensional unit cells with periodic boundary conditions. Considering the fact that the interfaces in multilayer composites dominate their plastic respon...
Article
In this study, the behavior of recycled steel fiber reinforced concrete (RSFRC) is investigated through uniaxial cyclic compression and biaxial tests conducted on 56 cubic specimens with four admixtures of RSF-content. The results obtained from cyclic compression tests show that the presence of RSFs reduces the damage of specimens in the post-peak...
Article
Full-text available
We have analysed the response of cells on a bed of micro-posts idealized as a Winkler foundation using a homeostatic mechanics framework. The framework enables quantitative estimates of the stochastic response of cells along with the coupled analysis of cell spreading, contractility and mechano-sensitivity. In particular the model is shown to accur...
Article
Concrete is one of the most widely used building materials in the world and the use of fiber-reinforced concrete (FRC) in structures, to increase its tensile strength and improve its behavior, has been extensively developed in recent decades. It is necessary to determine the constitutive equations of FRCs when the numerical investigation of the beh...
Article
Lithium-ion batteries with single ion-conductor ceramic electrolytes short-circuit when subjected to charging currents above a critical current density. Here, we analyse the rate at which a lithium (Li) filament (sometimes referred to as a dendrite) will grow from the cathode towards the anode during charging of such batteries. The filament is mode...
Article
Full-text available
In the presence of anisotropic biochemical or topographical patterns, cells tend to align in the direction of these cues—a widely reported phenomenon known as “contact guidance.” To investigate the origins of contact guidance, here, we created substrates micropatterned with parallel lines of fibronectin with dimensions spanning multiple orders of m...
Article
We idealise dendrite growth in a ceramic electrolyte by climb of a thick edge dislocation. Growth of the dendrite occurs at constant chemical potential of Li+ at the dendrite tip: the free-energy to fracture and wedge open the electrolyte is provided by the flux of Li+ from the electrolyte into the dendrite tip. This free-energy is dependent on the...
Article
Full-text available
Nowadays, steel fiber reinforced concretes (SFRCs) are widely used in practical applications. Significant experimental research has thus been carried out to determine the constitutive equations that represent the behavior of SFRCs under multiaxial loadings. However, numerical modelling of SFRCs via FEM has been challenging due to the complexities o...
Article
Commitment of stem cells to different lineages is inherently stochastic but regulated by a range of environmental bio/chemo/mechanical cues. Here, we develop an integrated stochastic modelling framework for predicting the differentiation of hMSCs in response to a range of environmental cues, including sizes of adhesive islands, stiffness of substra...
Article
One of the recurring anomalies in the hydrogen induced fracture of high strength steels is the apparent disconnect between their toughness and uniaxial tensile strength in identical hydrogen environments. Here we propose, supported by detailed atomistic and continuum calculations, that unlike macroscopic toughness, hydrogen-mediated tensile failure...
Preprint
Full-text available
Commitment of stem cells to different lineages is inherently stochastic but regulated by a range of environmental bio/chemo/mechanical cues. Here we develop an integrated stochastic modelling framework for predicting the differentiation of hMSCs in response to a range of environmental cues including sizes of adhesive islands, stiffness of substrate...
Article
A special type of cable bracing system comprising a pre-stressed cable and a drum interacting via frictional contact is proposed for lateral resistance of structures, and an analytical solution for the response of this system is developed. The response of the system is highly non-linear due to the existence of frictional contact as well as geometri...
Article
Full-text available
Contact guidance—the widely known phenomenon of cell alignment induced by anisotropic environmental features—is an essential step in the organization of adherent cells, but the mechanisms by which cells achieve this orientational ordering remain unclear. Here, we seeded myofibroblasts on substrates micropatterned with stripes of fibronectin and obs...
Article
Full-text available
Cells are quintessential examples of out-of-equilibrium systems, but they maintain a homeostatic state over a timescale of hours to days. As a consequence, the statistics of all observables is remarkably consistent. Here, we develop a statistical mechanics framework for living cells by including the homeostatic constraint that exists over the inter...
Preprint
Full-text available
Contact guidance- the widely-known phenomenon of cell alignment induced by anisotropic environmental features is an essential step in the organization of adherent cells, but the mechanisms by which cells achieve this orientational ordering remain unclear. Here we seeded myofibroblasts on substrates micropatterned with stripes of fibronectin and obs...
Article
Biological spread cells exist in a perpetually fluctuating state and therefore cannot be described in terms of a unique deterministic system. For modeling approaches to provide novel insight and uncover new mechanisms that drive cell behavior, a framework is required that progresses from traditional deterministic methods (whereby simulation of an e...
Article
Discrete dislocation plasticity (DDP) analysis of the high-temperature cyclic deformation of two- phase composites comprising a plastic matrix and elastic precipitates is presented. Deformation of the matrix is by climb-assisted glide of dislocations while the precipitates deform by a combination of bulk elasticity and stress-driven interfacial dif...
Article
Discrete dislocation plasticity (DDP) analysis of the high-temperature cyclic deformation of two-phase composites comprising a plastic matrix and elastic precipitates is presented. Deformation of the matrix is by climb-assisted glide of dislocations while the precipitates deform by a combination of bulk elasticity and stress-driven interfacial diff...
Article
Full-text available
The continuum theory of dislocations is applied to formulate the problem of a double ended dislocation pileup under quadratic applied stress. Accordingly, a second order stress gradient plasticity model is presented to address the contribution of the first and the second stress gradients in the effect interpretation. The model is employed to predic...
Article
Discrete dislocation plasticity (DDP) analysis of the high temperature creep deformation of a single crystal Ni superalloy comprising Ni3 Al precipitates ( ) in a Ni matrix (γ) is presented. The precipitates remain elastic but can also deform due to the stress-driven inter-diffusion of the Al within the Ni on the interface while plastic deformation...
Article
Full-text available
Effects of particle size on metal matrix composites are studied within the Continuum theory of Mechanism-based Strain Gradient (CMSG) plasticity. This theory has been quite successful in predicting the size-dependent plastic behavior in a wide variety of problems. Two-dimensional (plane-strain) analyses carried out on the composite unit cell models...
Article
2016 Elsevier Ltd We present a discrete dislocation plasticity (DDP) framework to analyse the high temperature deformation of multi-phase materials (composites) comprising a matrix and inclusions. Deformation of the phases is by climb-assisted glide of the dislocations while the particles can also deform due to stress-driven interfacial diffusion....
Article
Plastic deformation around a stationary mode I crack in an isotropic material is studied within the continuum theory of stress gradient plasticity (sGP). This model, as a lowerorder plasticity theory, has been quite successful in predicting the size-dependent plastic behavior in micro-torsion as well as micro-bending. However, its application to a...
Article
We present a discrete dislocation plasticity (DDP) framework to analyse the high temperature deformation of multi-phase materials (composites) comprising a matrix and inclusions. Deformation of the phases is by climb-assisted glide of the dislocations while the particles can also deform due to stress-driven interfacial diffusion. The general framew...
Article
A continuum implementation of stress gradient plasticity is established to analyze passivated thin films under tension. It is verified and evaluated by investigation of the tensile response of passivated Cu films with different thicknesses and grain sizes. The material parameters are fitted to the stress-strain experimental data, while the length s...
Article
The displacement field for dislocation dipoles periodically arranged along both x- and y-directions is found to be conditionally convergent. That is, different displacement fields are obtained depending on the order of the summation to be adopted. From the two summations, one can be performed analytically; however, the other one has to be performed...
Article
Natural clay soils due to anisotropy have a different behavior from disturbed and remolded specimens. The Modified Cam Clay (MCC) model, as a fundamental critical state model, cannot capture this behavior with enough accuracy. However, anisotropic models that known as rotational hardening models can efficiently simulate the anisotropic behavior. Sp...
Research
Full-text available
Natural clay soils due to anisotropy have a different behavior from disturbed and remolded specimens. The Modified Cam Clay (MCC) model, as a fundamental critical state model, cannot capture this behavior with enough accuracy. However, anisotropic models that known as rotational hardening models can efficiently simulate the anisotropic behavior. Sp...
Article
The plastic behavior of particle-reinforced composites is studied by the continuum theory of stress gradient plasticity. This theory has been quite successful in predicting the size-dependent behavior in micro-torsion and -bending. Analyses are carried out on the axisymmetric unit cell finite element models for two sets of SiC/Al composites. Subseq...
Article
The behaviour of a dislocation pileup with a finite-strength source is investigated in the presence of various stress gradients within a continuum model where a free-dislocation region exists around the source. Expressions for dislocation density and stress field within the pileup are derived for the situation where there are first and second spati...
Article
Full-text available
Analyses of monotonic loading of a plane-strain mode I crack in an fcc single crystal under small-scale yielding are carried out using discrete dislocation plasticity (DDP) incorporating anisotropic elasticity. Two crystallographically symmetric crack orientations are considered where plane-strain plastic deformation is achieved by the nucleation a...
Article
Full-text available
Small-scale yielding around a stationary mode I crack in a cubic single crystal is analyzed in terms of plane-strain elastically anisotropic discrete dislocation plasticity (DDP). Two symmetric crack orientations are considered with two objectives in mind. First, we study the sensitivity to materials aspects such as dislocation source density and e...
Article
The increasing application of plane-strain testing at the (sub-) micron length scale of materials that comprise elastically anisotropic cubic crystals has motivated the development of an anisotropic two-dimensional discrete dislocation plasticity (2D DDP) method. The method relies on the observation that plane-strain plastic deformation of cubic cr...
Article
Full-text available
Two-dimensional (2D) discrete dislocation plasticity simulations are carried out to investigate the Bauschinger effect (BE) in freestanding thin films. The BE in plastic flow of polycrystalline materials is generally understood to be caused by inhomogeneous deformation during loading, leading to residual stress upon unloading. This inhomogeneity ca...
Article
A method is proposed to estimate the size-dependent yield strength of columnar-grained freestanding thin films. The estimate relies on assuming a distribution of the size of Frank–Read sources, which is then translated into a log-normal distribution of the source strength, depending on film thickness, grain size and theoretical strength of the mate...
Article
In this paper a new algorithm based on the reproducing kernel method is presented for linear transient analysis using very large time steps. In the conventional time integration methods, the required accuracy is always achieved by either decreasing the size of time steps or increasing the order of approximations. The proposed method, however, does...
Article
Full-text available
In this paper, the main characteristics of Frank–Read (F–R) sources used in a mechanism-based discrete dislocation plasticity (M-DDP) analysis are estimated by employing a recently developed non-singular continuum elastic theory of dislocations. The critical nucleation stress, τnuc, is determined more accurately because the dislocation core effects...

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