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Meeting Materials Science & Technology 2019
Symposium Formability and Fracture of Metal Sheets
Presentation Title Distortional Anisotropic Hardening Model for Describing Complex Bauschinger and Transient Effects in Metal Forming Simulations
Author(s) Myoung-Gyu Lee, Hongjin Choi, Jinwoo Lee, Hyukjong Bong, Kwang Seon Shin
On-Site Speaker (Planned) Myoung-Gyu Lee
Abstract Scope A new hardening law for describing complex flow behaviors of metals is proposed. The model is based on distortional anisotropic hardening concept developed to represent the Bauschinger and transient behaviors when loading directions are changed. The loading path changes are observed in metal forming process and their modeling in FE simulations is essential to enhance overall quality of process optimization. Particularly, this study focuses on the anisotropy of yield stress and hardening under reversed and orthogonal loadings, which is not well explained by kinematic hardening introducing translation of yield surface. Instead, distortion of yield surface as a function of plastic deformation can predict these features in efficient way. The model with properly suggested evolution equations for state variables are numerically implemented into user subroutines of an FE program, which is validated by reproducing unique features of anisotropic hardening responses in the examples of metal deformation under various loading path changes.
Proceedings Inclusion? Definite: At-meeting proceedings


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