Crystal plasticity constitutive model for BCC based on the dislocation density

NIE Junfeng; TANG Zhenrui; ZHANG Haiquan; LI Hongke; WANG Xin

doi:10.16511/j.cnki.qhdxxb.2017.25.037

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Journal of Tsinghua University(Science and Technology) ›› 2017, Vol. 57 ›› Issue (7) : 780-784. DOI: 10.16511/j.cnki.qhdxxb.2017.25.037

NUCLEAR ENERGY AND NEW ENERGY

Crystal plasticity constitutive model for BCC based on the dislocation density

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Abstract

Crystal plasticity theory is a fundamental theory that combines the crystal microscopic slip mechanism with macroscopic plastic deformation to predict meso-scale plastic deformation. The dislocation density has an important influence on the hardening behavior of metal crystals. This paper presents a constitutive model based on crystal plasticity theory and dislocation motion theory for the BCC crystal structure. The model is used to study the mechanical behavior of a BCC lattice. Using the UMAT subroutine in ABAQUS for numerical simulations of a uniaxial tensile tests of single crystal and polycrystal iron. The results show that the constitutive model effectively simulates the mechanical behavior of the uniaxial tensile test for single crystal and polycrystal iron.

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crystal plasticity / dislocation motion / body center cubic (BCC) / uniaxial tensile / finite element method (FEM)

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NIE Junfeng, TANG Zhenrui, ZHANG Haiquan, LI Hongke, WANG Xin. Crystal plasticity constitutive model for BCC based on the dislocation density[J]. Journal of Tsinghua University(Science and Technology). 2017, 57(7): 780-784 https://doi.org/10.16511/j.cnki.qhdxxb.2017.25.037

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