Abstract
This paper describes the process of stress coining that improves fatigue performance at the hole. In stress coining, residual compressive stresses are induced at the edge of the hole, the elastic-plastic boundary in the plate material is located slightly away from the hole, the minimum and maximum pressures which establish the residual stresses are determined, the residual stresses and their distributions in the partially elastic zone and partially plastic zone are analyzed, and the minimum and maximum mandrel sizes are determined as well as the lower and upper limits of the mandrel-hole interference in the mandrel design. Numerical solutions are given for varieties of different mandrel materials, plate materials, and hole sizes.
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