Transactions of Materials and Heat Treatment

Title：Prediction of sheet metal forming limit diagram by applying ductile fracture criterion

Authors： YU Xin-hong ZHAI Ni-zhi ZHAI Jiang-bo(Department of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China)

Unit：

KeyWords： forming limit diagram ductile fracture criterion numerical simulation

ClassificationCode：TG386.4

year,vol(issue):pagenumber：2007,32(5):44-47

Abstract：

To predict the forming limit diagrams(FLD) of sheet metals,Oyan ductile fracture criterion was introduced into numerical simulation.The influence of normal anisotropic coefficient on the item in different strains of the criterion were discussed and material constants in the criterion were obtained by testing the fracture strains of uniaxial tensile and plan strain stretching.The forming limit was predicted in the male punch bulging test by substituting the values of stress and strain of every time step obtained from numerical simulation into ductile fracture criterion.Oyan ductile fracture criterion was applied to predict the FLD of A5182-O and SPCC.The results indicate that the combination of ductile fracture criterion and numerical simulation can successfully predict the forming limit diagram of sheet metals.

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Reference：

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