ABSTRACT
Studying on the accuracy of forming limited diagram for H340LAD-Z steel on the platform of dynaform software, virtual material method is used to adjust the value of exponent in Barlat’s yield surface m, exponent for Swift exponential hardening n, Lankford parameter r. The virtual material parameters are studied in this paper. Overall distribution of uniaxial tensile strain at break test is obtained with XJTUDIC three-dimensional digital speckle strain measurement and analysis system. The results show that the optimal level parameters can be obtained when m = 4, r = 0.8, n = 0.18 and ultimate displacement relative error is decreased from 15% to 6.3%.
