期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.01.092
关键词
Bauschinger effect; Crystal plasticity; Dislocation pileup
类别
资金
- POSCO [2011-0009801]
- World Class University (WCU) through the National Research Foundation [R32-10147]
A multi-scale micro-mechanical model was proposed to predict the cyclic behavior of dual-phase steels. The approach proposed in this study incorporates a simplified dislocation density model into the crystal plasticity finite element method (CP-FEM). The back stress resulting from dislocation pileups was used to reproduce the transient hardening behavior during load reversal. The simulations conducted using representative volume elements for the dual-phase steels lead to the following conclusions: (1) the large Bauschinger effect (BE) and permanent softening in dual-phase steels originate primarily from the inhomogeneity due to the soft and hard phases; (2) the elastic incompatibility due to the grain orientation distribution generates some BE, but is not sufficient to explain the measured stress-strain curve; and (3) the inclusion of the back stress produced by the dislocation pileup can explain the strain hardening stagnation during reverse loading. (C) 2012 Elsevier B.V. All rights reserved.
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