javani - Associate Professor, Mechanical Engineering , Isfahan University of Technolgy , Isfahan, Iran
Farzin - M.SC, Mechanical Engineering , Isfahan University of Technolgy , Isfahan, Iran
Mashayekhi - P.H.D Candiate, Mechanical Engineering , Isfahan University of Technolgy , Isfahan, Iran

Since in blanking processes, requirements concerning product dimensions are becoming more severe, the author aims to investigate virtually the blanking process parameters and also it takes in to consideration the role of a new parameter in crack initiation named Die to Punch corner ratio (RD/RP ) that has not been studied before. In addition stress distributions through the Die in blanking of two adjacent holes are of concern. Consequently minimum gap between these two adjacent holes can be obtained for various die and sheet materials, which is a valuable and to the authors knowledge a missing data in the die design literature. The effects of different criteria on the blanking force have been compared and therefore the methodology for choosing appropriate press machine can be realized

Blanking, Gurson damage model, crack initiation