Results 1 to 10 of about 285,935 (162)
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.
Sandra Fuentes-Alonso +2 more
arxiv +7 more sources
Stress-gradient plasticity. [PDF]
Proc Natl Acad Sci U S A, 2011 A new model, stress-gradient plasticity, is presented that provides unique mechanistic insight into size-dependent phenomena in plasticity. This dislocation-based model predicts strengthening of materials when a gradient in stress acts over dislocation source–obstacle configurations.
Chakravarthy SS, Curtin WA.
europepmc +6 more sources
Localization analysis of variationally based gradient plasticity model [PDF]
International Journal of Solids and Structures, 50(1), 256--269
(2013), 2012 The paper presents analytical or semi-analytical solutions for the formation and evolution of localized plastic zone in a uniaxially loaded bar with variable cross-sectional area.
Aifantis +17 more
core +2 more sources
Localization Analysis of an Energy-Based Fourth-Order Gradient Plasticity Model [PDF]
European Journal of Mechanics - A/Solids, 55, pp. 256--277, 2016, 2015 The purpose of this paper is to provide analytical and numerical solutions of the formation and evolution of the localized plastic zone in a uniaxially loaded bar with variable cross-sectional area.
Jirásek, Milan +2 more
core +2 more sources
Strain gradient plasticity: energetic or dissipative? [PDF]
Acta Mechanica Sinica, 2015 It has been established by computation, and confirmed by analysis, for an infinite slab of strain-gradient sensitive material subjected to plane-strain tensile loading, that passivation of the lateral boundaries at some stage of loading inhibits plastic ...
Fleck, NA, Willis, JR
core +5 more sources
On fracture in finite strain gradient plasticity [PDF]
International Journal of Plasticity, 2016 In this work a general framework for damage and fracture assessment including the effect of strain gradients is provided. Both mechanism-based and phenomenological strain gradient plasticity (SGP) theories are implemented numerically using finite deformation theory and crack tip fields are investigated.
E. Martínez-Pañeda, C.F. Niordson
openaire +8 more sources
Gradient plasticity in gradient nano-grained metals [PDF]
Extreme Mechanics Letters, 2016 Gradient nano-grained (GNG) metals are a unique class of materials with spatial gradients in grain size, typically from the surface to the bulk. Here the gradient mechanical behavior in GNG copper is studied by a crystal plasticity finite element model that accounts for grain-size-dependent yield strengths.
Xiaoyan Li +5 more
openaire +2 more sources
HOMOGENIZATION IN GRADIENT PLASTICITY [PDF]
Mathematical Models and Methods in Applied Sciences, 2011 This paper yields a two-scale homogenization result for a rate-independent elasto-plastic system. The presented model is a generalization of the classical model of linearized elasto-plasticity with hardening, which is extended by a gradient term of the plastic variables.
openaire +4 more sources
Dislocation plasticity in thin metal films [PDF]
, 2002 This article describes the current level of understanding of dislocation plasticity in thin films and small structures in which the film or structure dimension plays an important role. Experimental observations of the deformation behavior of thin films,
Arzt, E. +3 more
core +1 more source
Some properties of the dissipative model of strain-gradient plasticity [PDF]
, 2016 A theoretical and computational investigation is carried out of a dissipative model of rate-independent strain-gradient plasticity and its regularization.
Carstensen, C +4 more
core +2 more sources