•Complex equations include strain hardening, strain-rate sensitivity, and temperature sensitivity.•Reduced starting sets from 28 to 3, an improvement of 8500%.•Uniqueness and accuracy verified for 6 AHSS: DP590/780/980, TRIP780, CP1180, TWIP.•Constitutive equations extrapolate to large, balanced-biaxial strains accurately (up to 6X).•Final equations suitable for predicting shear fracture of AHSS; new form for TWIP.
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A. Twinning-induced plasticity (TWIP) steel,A. Phase transformation (TRIP) steel,B. Constitutive behavior,B. Advanced high strength steel (AHSS)
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