Issues associated with the use of Yoshida nonlinear isotropic/kinematic hardening material model in Advanced High Strength Steels

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

Shi, Ming F.^1 ; Zhang, Li^2 ; Zhu, Xinhai^2

United States Steel Corporation, 5850 New King Court, Troy

MI

48098, United States^1

Livermore Software Technology Corporation, 7374 Las Positas Road, Livermore

CA

94551, United States^2

关键词: Advanced high strength steel;    Automotive component;    Forming simulations;    Hardening materials;    Industrial scale;    Material parameter;    Springback prediction;    Tension and compression;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/734/3/032118/pdf
DOI  :  10.1088/1742-6596/734/3/032118

来源: IOP

【 摘 要 】

The Yoshida nonlinear isotropic/kinematic hardening material model is often selected in forming simulations where an accurate springback prediction is required. Many successful application cases in the industrial scale automotive components using advanced high strength steels (AHSS) have been reported to give better springback predictions. Several issues have been raised recently in the use of the model for higher strength AHSS including the use of two C vs. one C material parameters in the Armstrong and Frederick model (AF model), the original Yoshida model vs. Original Yoshida model with modified hardening law, and constant Young's Modulus vs. decayed Young's Modulus as a function of plastic strain. In this paper, an industrial scale automotive component using 980 MPa strength materials is selected to study the effect of two C and one C material parameters in the AF model on both forming and springback prediction using the Yoshida model with and without the modified hardening law. The effect of decayed Young's Modulus on the springback prediction for AHSS is also evaluated. In addition, the limitations of the material parameters determined from tension and compression tests without multiple cycle tests are also discussed for components undergoing several bending and unbending deformations.