Abstract
The effect of yield surface shape on sheet forming limits based on Marciniak and Kuczynski approach is studied. In order to describe the material behaviour, several yield functions have been used, particularly the one proposed in Part I. It is shown that the geometric parameter related to the yield surface shape, introduced recently by Barlat, is able to represent approximately the effect of yield surface shape on stretching limits. A diagram called “yield surface shape hardening diagram (YSSHD)” is proposed in order to describe the effect of yield surface shapes on forming limit diagrams (FLDs) more precisely. It is shown that different yield surfaces lead to the same FLDs when their YSSHDs are the same. However, similar yield surfaces lead to quite different FLDs when their YSSHDs are different. Also, it is found that the experimental FLDs of many materials can be explained by choosing an exponent parameter M between 5 and 10 in the yield function proposed in Part I ( Barlat & Lian[1989]).
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