Abstract
Dynamic failure of the spot welded automotive steel sheets, similar and dissimilar combinations of TRIP980 and GMW2 sheets, was analyzed with finite element (FE) simulations. The strain rate-sensitivity of the base sheets was considered to investigate the influence of dynamic loading on failure behavior of the welded sheets. Mechanical properties were first identified under the quasi-static loading as the reference condition. Hardening behavior and fracture criterion were identified by numerical inverse method applied to the standard tensile test and a miniature tensile test for the base sheet and the weld nugget, respectively. Moreover, strain rate-sensitivities of the base sheets were inversely characterized as a function of strain and strain rate. Dynamic lap-shear and coach-peel coupon tests were performed to evaluate the dynamic failure behavior of the welded sheets. Peak strength, failure mode and load-displacement curves of the coupon tests were predicted with the FE simulations. The combined experimental and numerical approach showed that the strain rate-sensitivity of the base sheet played a key role on determination of failure characteristics in coupon tests.
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