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Due to an increasing usage of dual phase (DP) steels in the automotive industry, it is necessary to fully investigate the mechanical response of DP steels during sheet forming processes or crash events. In this work, the mechanical response of DP600 obtained at different strain rates was used to calibrate the Yld2004-18P yield function at each level of strain rate, and the effect of strain rate on the flow surface was evaluated. Results showed that variation in the material anisotropy coefficients as a function of strain rate can alter the shape of the flow surface of DP600. The current modelling approach is shown to provide a frame work for the incorporation of strain rate-dependence of anisotropy within finite element simulations of sheet metal forming and crashworthiness.

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