Fatigue Strength

The uni-axial forces applied to sheet metal during stamping are primarily tensile. Depending on the shape of the formed product, the stamping force may induce a residual stress on the workpiece. While “work hardening” can actually increase the tensile strength of the material, the residual stresses of the stamping operation may decrease the material's resistance to fatigue. These residual stresses resemble the bending a paperclip back and forth. It is possible that the material will fracture at a stress much lower then the tensile strength. Fatigue Analysis helps determine a material's behavior and fatigue strength characteristics given a specified design and stamping process. Fatigue Analysis allows the designer to ensure that the stamping process and selected materials are compatible to prevent excessive failure and scrap.