|About this Abstract
||NUMISHEET 2022: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||Implementation of Polynomial Yield Functions and Flow Potentials in Finite Element User Material Subroutines
||Seung-Yong Yang, Wei Tong
|On-Site Speaker (Planned)
Polynomial yield functions and flow potentials were implemented in ABAQUS Standard and Explicit user material subroutines (UMAT and VUMAT) and LS-DYNA UMAT for the analysis of plastic deformation of sheet metals. As an important step to check the validity of the input material parameters of polynomial functions, a certification of convexity was implemented in the user material subroutines for Gotoh's quartic yield function and sixth-order and eighth-order homogenous polynomial stress functions. An option was also provided to compute the second-order plastic work rate for the non-associated quadratic and quartic plasticity models. The capability of a quadratic polynomial yield function implemented in user material subroutines was first verified by comparison with ABAQUS rate-independent associated plasticity model which uses the same yield function. The implementation of non-quadratic polynomial anisotropic plasticity models was further verified via some forming simulation examples of selected sheet metals.
||Definite: At-meeting proceedings