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

Abstract

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.

Designing a Uniaxial Tension/Compression Test for Springback Analysis in High-Strength Steel Sheets

“…These results were achieved with a maximum lateral force of approximately −2.3 kN (−517 psi), which is significantly less than the 8 kN (1800 psi) to 10 kN (2250 psi) restoring force reported in the literature [31,19]. These low friction results validated the principal philosophy behind our design.…”

Comparison of the hardening behaviour of different steel families: From mild and stainless steel to advanced high strength steels

“…Yoshida et al [39] suggested bonding five pieces of sheets together before machining them so that the thickness of the specimen was 5.0 mm. Bae and Hug [33] used a spring-loaded clamping device in various strain rates. More recently, a transparent wedge device was designed to prevent the buckling of thin sheets, allowing full field strain measurements of the specimen using digital imaging methods [40].…”

“…This test only achieves a maximum deformation of approximately 3%; however it could be appropriate to characterize low deformation processes such as the roll levelling process, in which the maximum material deformation is usually lower than 2%. Nevertheless, the test is difficult to perform, due to the tendency of the specimen to buckle in compression [33].…”

Effect of Punch Speed on Amount of Springback in U-bending Process of Auto-body Steel Sheets

“…Using experimental method proposed by Bae and Huh, 2011, tension/compression tests of SPCC and DP780 were carried out at the strain rates of 0.001/s and 1/s. True stres the tension/compression tests and hardening curves expand with the increase strain rates for both steel sheets.…”

“…However, strain rate is known to be an important parameter to influence the hardening behavior of sheet metals. Moreover, Bae and Huh (2011) recently carried out the tension/compression test of steel sheets in order to investigate the effect of the strain rate on the tension/compression hardening behaviour. The tension/compression hardening behaviour of steel sheets changes sensitively with the variation of the strain rate.…”