Tension/compression test of auto-body steel sheets with the variation of the pre-strain and the strain rate

This paper investigates the tension/compression hardening behaviour of autobody steel sheets with the variation of the pre-strain and the strain rate.To conduct tension/compression tests with the variation of the pre-strain and the strain rate, an experimental method was established by using a newly developed clamping device to suppress buckling of a specimen.The clamping device provides the supporting force from compression-type coil springs during the test with a conventional dynamic material fatigue testing machine.From experiments, the tension/compression hardening behaviour was observed with the variation of the pre-strain and the strain rate.Effects of the pre-strain and the strain rate on the hardening behaviour were also investigated based on the tension/compression test results.