Development of a multiaxial stress testing system with quasi-high strain rate for light weight materials for next generation transportation vehicles

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A servo-controlled biaxial stress testing machine was developed for the accurate measurement of the biaxial stress-strain curves of sheet metals under quasi-high strain rates. Tubular specimens were fabricated by bending sheet samples and welding the sheet edges. The deformation behavior and forming limit stresses and strains of a cold rolled IF steel sheet (SPCE), an aluminum alloy sheet and a high strength steel sheet were successfully measured. Moreover, a differential work hardening model that is capable of reproducing the work hardening behavior of the test materials under biaxial tension has been successfully developed. The experimental results quantitatively agreed with those calculated using a strain localization analysis based on the Marciniak-Kuczyński approach. Thus, it has been verified that the proposed multiaxial material testing method is useful for determining accurate constitutive models for sheet metals.