Investigate earing of TWIP steel sheet during deep-drawing process by using crystal plasticity constitutive model

J Yang,Y Cai,B Wang,X.R Guo,C.Y Sun,Y Qin,S J Yuan,F Vollertsen,J Lin,T A Dean

doi:10.1051/matecconf/20152112002

Abstract

By combining the nonlinear finite element analysis techniques and crystal plasticity theory, the macroscopic mechanical behaviour of crystalline material, the texture evolution and earing-type characteristics are simulated accurately. In this work, a crystal plasticity model exhibiting deformation twinning is introduced based on crystal plasticity theory and saturation-type hardening laws for FCC metal Fe-22Mn-0.6C TWIP steel. Based on the CPFE model and parameters which have been determined for TWIP steel, a simplified finite element model for deep drawing is promoted by using crystal plasticity constitutive model. The earing characteristics in typical deep-drawing process are simulated well. Further, the drawing forces are calculated and compared to the experimental results from reference. Meanwhile, the impacts of drawing coefficient and initial texture on the earing characteristics are investigated for controlling the earing.

Highlights

With the rise of automobile industry in recent years, more demands and higher standards are set for it out of the great importance attached to environmental protection and energy saving, including lower fuel consumption and higher security
Based on the crystal plasticity finite element (CPFE) model and parameters which have been determined for TWIP steel, a simplified finite element model for deep drawing is promoted by using crystal plasticity constitutive model
The earing-type of TWIP steel depends on the initial texture, and the earing ratio varies a lot under different initial texture, while the initial texture does not affect the force so much

Summary

Introduction

With the rise of automobile industry in recent years, more demands and higher standards are set for it out of the great importance attached to environmental protection and energy saving, including lower fuel consumption and higher security. For a better understanding on the effect of slip and twinning during plastic deformation of TWIP steel, the research on twinning and slipping mechanism of TWIP steel under crystal plasticity constitutive relation model has become the focus in recent years [5]. The impact of drawing coefficient and initial texture on the erringtype, earing ratio and drawing forces is discussed to get corresponding conclusions

CPFE model and the deep-drawing process of TWIP steel

Polycrystal plasticity homogenization method

Results and discussion

Conclusions