Trapping and escape of dislocations in micro-crystals with external and internal barriers
We perform three-dimensional dislocation dynamics simulations of solid and annular pillars,
having both free-surface boundary conditions, or strong barriers at the outer and/or inner …
having both free-surface boundary conditions, or strong barriers at the outer and/or inner …
Dislocation escape-related size effects in single-crystal micropillars under uniaxial compression
H Tang, KW Schwarz, HD Espinosa - Acta Materialia, 2007 - Elsevier
The size-dependence of the plastic response of single-crystal micropillars at
submicron/micron length scales under compression was investigated using three …
submicron/micron length scales under compression was investigated using three …
Micro-pillar plasticity: 2.5 D mesoscopic simulations
AA Benzerga - Journal of the Mechanics and Physics of Solids, 2009 - Elsevier
The plastic behavior of micro-and nano-scale crystalline pillars is investigated under
nominally uniform compression. The transition from forest hardening to exhaustion …
nominally uniform compression. The transition from forest hardening to exhaustion …
Surface-controlled dislocation multiplication in metal micropillars
CR Weinberger, W Cai - Proceedings of the National …, 2008 - National Acad Sciences
Understanding the plasticity and strength of crystalline materials in terms of the dynamics of
microscopic defects has been a goal of materials research in the last 70 years. The size …
microscopic defects has been a goal of materials research in the last 70 years. The size …
Plasticity of bcc micropillars controlled by competition between dislocation multiplication and depletion
Recent micropillar experiments have shown strong size effects at small pillar diameters. This
“smaller is stronger” phenomenon is widely believed to involve dislocation motion, which …
“smaller is stronger” phenomenon is widely believed to involve dislocation motion, which …
Stochastic behaviors in plastic deformation of face-centered cubic micropillars governed by surface nucleation and truncated source operation
Three dimensional dislocation dynamics (DD) simulations are performed to investigate the
governing mechanism of size dependent plastic deformation in submicron face-centered …
governing mechanism of size dependent plastic deformation in submicron face-centered …
Discrete dislocation simulations of the plasticity of micro-pillars under uniaxial loading
J Senger, D Weygand, P Gumbsch, O Kraft - Scripta Materialia, 2008 - Elsevier
Recent experiments have shown an unexpected strong size effect in uniaxial compression
tests of metallic micro-pillars, such as the flow stress increases with decreasing pillar …
tests of metallic micro-pillars, such as the flow stress increases with decreasing pillar …
Dislocation-source shutdown and the plastic behavior of single-crystal micropillars
H Tang, KW Schwarz, HD Espinosa - Physical review letters, 2008 - APS
Dislocation dynamics simulations have been used to study the stress-strain response of
single-crystal micropillars containing initial dislocation networks generated via a relaxation …
single-crystal micropillars containing initial dislocation networks generated via a relaxation …
Temperature insensitivity of the flow stress in body-centered cubic micropillar crystals
Plasticity of body-centered cubic (bcc) crystals is known to have a strong dependence on
temperature, as a direct consequence of the thermally-activated process of kink pair …
temperature, as a direct consequence of the thermally-activated process of kink pair …
Micro-pillar plasticity controlled by dislocation nucleation at surfaces
A model of micro-pillar plasticity controlled by the nucleation of dislocations at free surfaces
was developed using methods of dislocation dynamics innovated by Johnston and Gilman …
was developed using methods of dislocation dynamics innovated by Johnston and Gilman …