The polycarbonate plate is adopted in our study. The relations between: Punching force and clearance; Formation and devlopment of plastic deformation in workpieees; Formation and extension of macroscopic cracks arestudied by compared method. The relation between punching force and clearance in the elastic deformation region is shown graphically. And, the relation between punching force and the size of specimen is also shown in curves. Finally, qualitative analysis is made for phenomena occured after plastic...
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