Residual stress investigation of ceramic-shot-peened flange pin with finite element analysis

Abstract

The flange pin of landing gears, which is made of high strength low alloy, is peened with ZirShot-ZC600 ceramic shots. The residual stresses generated in the peened flange pin, which will affect the fatigue performance of the pin, are investigated with finite element analysis (FEA). Three-dimensional FEA model is created to simulate the target surface and shot peening flow which is generated randomly using the MATLAB program. It is revealed that the residual stresses of the peened surface layer in longitudinal, circumferential and radial direction all vary in depth from the target surface and they are all compressive with the maximum compressive stresses occurring at subsurface. The effects of target surface curvature and shot peening angle on the residual stress profiles in the peened surface are also studied. The FEA simulation results show that the maximum residual stresses in flat surface are greater than that in the surface with curvature and with increasing peening angle, the location of the maximum residual stresses moves down in depth from the peened surface.