Application of the Concept of Local Fatigue Strength after Shot Peening of Notched Components Based on Numerical Simulations
Shot Peening is a well established mechanical surface treatment to induce compressive residual stresses and work hardening into the surface layer of components exposed to cyclic loading. Due to the induced changes in the surface layer, the fatigue limit increases significantly. The concept of local fatigue strength is based on the comparison of the locally effective fatigue limit with locally active loads in order to estimate the maximum outer loading that will not exceed fatigue limit. In this paper an approach of using simulated surface characteristics after shot peening for the determination of the local fatigue strength will be presented. The complex stress distribution due to cyclic bending of notched geometries will also be determined by FEM. Finally the simulated estimation of the fatigue limit of differently notched specimens of AISI 4140 will be verified with experimentally determined fatigue limits.
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
M. Klemenz and V. Schulze, "Application of the Concept of Local Fatigue Strength after Shot Peening of Notched Components Based on Numerical Simulations", Materials Science Forum, Vols. 638-642, pp. 912-917, 2010