Advanced constitutive modeling of AHSS sheets forapplication to springback prediction after U-draw double stamping process

10th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes

Choi, Jisik^1 ; Lee, Jinwoo^2 ; Lee, Myoung-Gyu^3 ; Barlat, Frederic^1

Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang

790-784, Korea, Republic of^1

Materials Deformation Department, KIMS, Changwon

51508, Korea, Republic of^2

Department of Materials Science and Engineering, Korea University, Seoul

136-713, Korea, Republic of^3

关键词: Anisotropic hardenings;    Bauschinger effects;    Constitutive parameters;    Finite element codes;    In-plane compression;    Mechanical characterizations;    Nonproportional loading;    Springback prediction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/734/3/032029/pdf
DOI  :  10.1088/1742-6596/734/3/032029

来源: IOP

【 摘 要 】

The reduction of springback for a U-shaped channel using a double drawing process was investigated. In this test, the punch strokes of the 1stand 2ndstamping steps were controlled and each followed by unloading. The simulations were conducted using kinematic and distortional hardening models, which were implemented into a finite element (FE) code to describe the Bauschinger effect and its associated anisotropic hardening effects during strain path change. In addition to the usual mechanical characterization tests, in-plane compression- tension experiments were conducted on DP980 and TWIP980 to determine the constitutive parameters pertaining to load reversal. Experimental and FE simulated results of the channel shape were compared for both materials in order to understand the effect of anisotropic hardening under non-proportional loading on springback.