Strain Localization Modes within Single Crystals Using Finite Deformation Strain Gradient Crystal Plasticity
Article dans une revue avec comité de lecture
The present paper aims at providing a comprehensive investigation of the abilities and limitations of strain gradient crystal plasticity (SGCP) theories in capturing different kinds of localization modes in single crystals. To this end, the small deformation Gurtin-type SGCP model recently proposed by the authors, based on non-quadratic defect energy and the uncoupled dissipation assumption, is extended to finite deformation. The extended model is then applied to simulate several single crystal localization problems with different slip system configurations. These configurations are chosen in such a way as to obtain idealized slip and kink bands as well as general localization bands, i.e., with no particular orientation with respect to the initial crystallographic directions. The obtained results show the good abilities of the applied model in regularizing various kinds of localization bands, except for idealized slip bands. Finally, the model is applied to reproduce the complex localization behavior of single crystals undergoing single slip, where competition between kink and slip bands can take place. Both higher-order energetic and dissipative effects are considered in this investigation. For both effects, mesh-independent results are obtained, proving the good capabilities of SGCP theories in regularizing complex localization behaviors. The results associated with higher-order energetic effects are in close agreement with those obtained using a micromorphic crystal plasticity approach. Higher-order dissipative effects led to different results with dominant slip banding.
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Communication avec acteCAI, Lei; JEBAHI, Mohamed; ABED-MERAIM, Farid (2019)Strain gradient crystal plasticity (SGCP) represents a very promising way to account for size effects in miniaturized components, thanks to the intrinsic length scale(s) embedded. Most of the existing SGCP models are based ...
On the application of strain gradient crystal plasticity to study strain localization phenomena in single crystals Communication sans acteCAI, Lei; JEBAHI, Mohamed; ABED-MERAIM, Farid (2021)Strain localization is an important plastic instability process occurring prior to fracture. It is usually observed in the form of narrow bands of intense plastic shear strain in deformed bodies undergoing severe inhomogeneous ...
Communication sans acteJEBAHI, Mohamed; CAI, Lei; ABED-MERAIM, Farid (2020)Thanks to their capabilities in capturing size effects, strain gradient plasticity theories have received a strong scientific interest in the last two decades. However, despite the great scientific effort on these theories, ...
Communication sans acteCAI, Lei; JEBAHI, Mohamed; ABED-MERAIM, Farid (2021)
Strain gradient crystal plasticity model based on generalized non-quadratic defect energy and uncoupled dissipation Article dans une revue avec comité de lectureJEBAHI, Mohamed; CAI, Lei; ABED-MERAIM, Farid (Elsevier, 2020)The present paper proposes a flexible Gurtin-type strain gradient crystal plasticity (SGCP) model based on generalized non-quadratic defect energy and uncoupled constitutive assumption for dissipative processes. A power-law ...