A canonical rate-independent model of geometrically linear isotropic gradient plasticity with isotropic hardening and plastic spin accounting for the Burgers vector [PDF]
Continuum Mechanics and Thermodynamics, 2019, 2016 In this paper we propose a canonical variational framework for rate-independent phenomenological geometrically linear gradient plasticity with plastic spin. The model combines the additive decomposition of the total distortion into non-symmetric elastic and plastic distortions, with a defect energy contribution taking account of the Burgers vector ...
arxiv +1 more source
Gradient Enhanced Strain Hardening and Tensile Deformability in a Gradient-Nanostructured Ni Alloy
Nanomaterials, 2021 Gradient-nanostructured material is an emerging category of material with spatial gradients in microstructural features. The incompatibility between gradient nanostructures (GNS) in the surface layer and coarse-grained (CG) core and their roles in extra ...
Xinlai An +6 more
doaj +1 more source
Global existence results for viscoplasticity at finite strain [PDF]
Archive Rational Mech. Analysis 227 (2018) 423-475, 2016 We study a model for rate-dependent gradient plasticity at finite strain based on the multiplicative decomposition of the strain tensor, and investigate the existence of global-in-time solutions to the related PDE system. We reveal its underlying structure as a generalized gradient system, where the driving energy functional is highly nonconvex and ...
arxiv +1 more source
Fracture in distortion gradient plasticity [PDF]
arXiv, 2020 In this work, distortion gradient plasticity is used to gain insight into material deformation ahead of a crack tip. This also constitutes the first fracture mechanics analysis of gradient plasticity theories adopting Nye's tensor as primal kinematic variable. First, the asymptotic nature of crack tip fields is analytically investigated.
arxiv
Dislocation microstructures and strain-gradient plasticity with one active slip plane
, 2015 We study dislocation networks in the plane using the vectorial phase-field model introduced by Ortiz and coworkers, in the limit of small lattice spacing.
Conti, Sergio +2 more
core +1 more source
A porous crystal plasticity constitutive model for ductile deformation and failure in porous single crystals [PDF]
, 2018 The author thankfully acknowledges the financial support of EPSRC funding (EP/ L021714/1).Peer ...
Siddiq, Amir
core +1 more source
Strength and plasticity of Cr/CrXN multilayers with gradient nanoarchitectures
Materials Research LettersRefining grain size and enhancing thermally assisted grain boundary activation are fundamental strategies for improving the plasticity of high-strength ceramic materials.
Heda Bai +10 more
doaj +1 more source
A theory for grain boundaries with strain-gradient plasticity
International Journal of Solids and Structures, 2014 AbstractIn this work, the effect of the material microstructural interface between two materials (i.e., grain boundary in polycrystalls) is adopted into a thermodynamic-based higher order strain gradient plasticity framework. The developed grain boundary flow rule accounts for the energy storage at the grain boundary due to the dislocation pile up as ...
Yida Zhang +2 more
openaire +2 more sources
Dissipation-consistent modelling and classification of extended plasticity formulations [PDF]
, 2018 A unified classification framework for models of extended plasticity is presented. The models include well known micromorphic and strain-gradient plasticity formulations.
McBride, A.T. +2 more
core +2 more sources
Theoretical and Applied Mechanics Letters, 2014 The plastic deformations of tempered martensite steel representative volume elements with different martensite block structures have been investigated by using a nonlocal crystal plasticity model which considers isotropic and kinematic hardening produced
Martin Boeff +2 more
doaj +1 more source