|About this Abstract
||NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes
||S-01: Modeling of the Anisotropic Behavior in Plasticity
||Rate-dependent Tension and Compression Hardening Behaviors of Ahss for Sheet Metal Forming Simulation
||Hoon Huh, G. Joo, J. Kwon
|On-Site Speaker (Planned)
This paper is concerned with evaluation of rate-dependent hardening behaviors of AHSS sheets with novel tension and compression testing devices. Hardening behaviors in tension and compression are indispensable for accurate numerical simulation of sheet metal forming and subsequent spring-back. In addition, it is important to consider the strain rate effect for hardening behaviors in tension and compression because sheet metal deformation prevails at intermediate strain rates up to several hundred’s per second in press shops of automotive industry. Hardening behaviors are evaluated in tension‒compression for TRIP980 and TWIP980 steel sheets at various strain rates ranging from 0.001 s−1 to 100 s−1 in terms of the flow stress considering the Bauschinger effect and the permanent softening. It is confirmed from the experiments that the Bauschinger effect decreases as the strain rate increases. The permanent softening defines the stress offset between flow stress curves in tension‒compression and monotonic tension with large deformation after loading reversal. It is observed that the stress offset is dependent on the inherent characteristics of steel sheets as well as the strain rates.