Correct Answer - Option 3 : In the flange of the blank, bi-axial tension and compression and in the wall of cup, simple uni-axial tension
Deep Drawing: when cup height is more than half the diameter is termed deep drawing. During deep drawing, in the flange of blank, there is bi‐axial tension and compression stresses and in the wall of cup uni-axial tensile stress.
State of stress in other metal working:
Blanking: In blanking, the piece being punched out becomes the work-piece and any major burrs or undesirable features should be left on the remaining strip. Blanking is a shearing operation.
Stretch forming: It is a method of producing contours in sheet metal. Thinning and strain hardening is inherent in the process. Stretch forming is a sheet metal forming process in which the sheet metal is intentionally stretched and simultaneously bent to have the shape change. It is a type of cold drawing. Stress-induced is mainly tensile.
Coining: It is essentially a cold‐forging operation except for the fact that the flow of the metal occurs only at the top layers and not the entire volume. In the coining process, compressive forces are there.
