Shot Peening and Media Finish Effect on Residual Stress and Surface Roughness

High Cycle Fatigue (HCF) is one of the critical factors determining the performance of high-pressure compressors in jet engines. In addition to specific vibrational modes, residual stress and surface roughness also play important roles in fatigue life and failure modes. Shot peening and media finishing are the two primary processes used to impart residual stress and smooth rough surfaces, respectively. However, each process involves different intensities and media types, such as steel or ceramic, which in turn affect the level of residual stress and surface roughness. This presentation demonstrates the effect of peening media on both residual stress and surface roughness, as well as the geometric effect on surface roughness evaluation.