Analysis of cyclic plasticity using a polycrystalline model taking account of size effect

作者：Zhang Jing; Zhang Keshi; Xu Lingbo

来源：Chinese Journal of Solid Mechanics, 2012, 33(3): 233-241.

• Back stress
• Constitutive relations
• Crystal plasticity
• Crystalline grains
• Cyclic loadings
• Cyclic plasticity
• Explicit algorithms
• Grain size
• Grain size effect
• Hardening function
• Material characteristics
• Polycrystalline copper
• Polycrystalline models
• Representative volume element (RVE)
• Size effects
• Strain cycles

In this contribution, a representative volume element (RVE) containing some anisotropic crystalline grains is modeled in order to analyze the plasticity behavior of polycrystal. All crystalline grains consisting of the poly-crystal are assumed to follow the Taylor';s hypothesis. To take the grain size effect into account, a hardening function which includes both the grain size and the material characteristic length was proposed; also, a back stress model was introduced to capture the directional hardening of crystals. An explicit algorithm for the present constitutive model is developed, and then implemented into the VUMAT subroutine of ABAQUS. Finite element analyses of a pure polycrystalline copper applied to the symmetric strain cycle show that the present model can reasonably capture the grain size dependent cyclic plasticity behavior.

• 出版日期2012
• 单位广西大学