The backstress effect of evolving deformation boundaries in FCC polycrystals

• Published in: International journal of plasticity Vol. 27; no. 8; pp. 1252 - 1266
• Main Authors: Brahme, Abhijit P., Inal, Kaan, Mishra, Raja K., Saimoto, S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.08.2011; Elsevier
• Subjects: Backstress; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Crystal plasticity; Deformation; Deformation and plasticity (including yield, ductility, and superplasticity); Density; Electron back scatter diffraction; Exact sciences and technology; Finite element analysis; Fundamental areas of phenomenology (including applications); Granular solids; Hardening; Inelasticity (thermoplasticity, viscoplasticity...); Kinematics; Material form; Mathematical analysis; Mathematical models; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Physics; Plasticity; Rheology; Solid mechanics; Static elasticity (thermoelasticity...); Strain paths; Structural and continuum mechanics; Unit cell; Crystal plasticity; Unit cell; Backstress; Finite element analysis; Strain paths; Eshelby tensor; Representative volume element; Geometrical shape; Electron backscattering; FCC crystals; Stress path; Dislocations; Exact solution; Finite element method; Inelasticity; Mesoscale; Internal stresses; Kinematic hardening; Granular materials; Modelling; Microstructure; Flow stress; Strain rate
• ISSN: 0749-6419; 1879-2154
• DOI: 10.1016/j.ijplas.2011.02.006

Shape change of metal systems generates deformed microstructures of dislocation arrays that are comprised of walls of high density separating low density cells. The flow stresses of these composite structures are equilibrated by an evolving internal stress due to the blockage of dislocation passage resulting in kinematic hardening in the meso-scale. The method of intra-granular backstress of Eshelby using Kröner based approach in closed form formulae can easily be incorporated into a crystal–plasticity-based model to predict the kinematic hardening. We have previously developed finite element analyses based on the rate dependent crystal plasticity theory, which can incorporate electron backscatter diffraction (EBSD) maps. We will use this model with inclusion of the calculated backstress to investigate the effect of changes in strain paths.