On the basis of risk section strength formula of Whitely and analyzing stressstrain distribution of the cylinder part in the process of deep drawing, a prediction formula suitable for anisotropic materials was proposed and the error source of formula calculation was explored, considering the effect of plastic strain ratio on sheet metal forming limit. The result shows that the difference between calculated pressure and experimental value is within 4.4%, which can more accurately reflect the relationship of deformation capability of sheet metal and deformation degree.
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