|About this Abstract
||NUMISHEET 2021: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||A Measurement of Tension/Compression Asymmetry in Stress and R-value and the Establishment of a Constitutive Model Based on Non-associated Flow Rule
||Nobuyasu Noma, Shinnosuke Uda, Toshihiko Kuwabara, Tomoyuki Hakoyama
|On-Site Speaker (Planned)
The tension/compression asymmetry in stress and r-value are investigated. Test materials are three dual phase steels with different grades. From the experimental results, stress asymmetry in tension and compression is measured while the r-values are almost identical to each other in tension and compression for all the test materials. Therefore, it is revealed that the test materials show the non-normal deformation behavior in the compressive stress state. In order to reproduce this behavior, a constitutive model based on non-associated flow rule is established. In this study, the asymmetric yield function is chosen to describe the yield surface. On the other hand, Hill’s quadratic yield function based on r-values is chosen as a plastic potential function. The validation of these constitutive models is also performed based on the material testing results. Consequently, it is demonstrated that the non-associated flow rule can accurately reproduce the deformation behavior both in tension and compression.
||Definite: At-meeting proceedings