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

Abstract

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.

Dynamics of periodic mechanical structures containing bistable elastic elements: From elastic to solitary wave propagation

“…However, as discussed above, bistable or multistable building blocks in periodic solids and structures also promise interesting nonlinear dynamic effects, including solitary-wave propagation, which provides opportunities to focus acoustic signals in mechanical metamaterials [4,80,81]. Homogeneous solids undergoing finite elastic deformation [82] as well as periodic media experiencing nonlinear elastic instabilities [83] have been shown to exhibit acoustic band gaps that are controllable by the amount of nonlinear predeformation, yet the investigated waves again operate in the linear elastic regime.…”