An Indentation Technique for Evaluating Residual Stresses Generated by Shot Peening

Author:  Siavash Ghanbari & David F. Bahr | Center for Surface Engineering & Enhancement, Purdue University
Source:  The Shot Peener magazine, Vol 34, Issue 1, Winter 2020
Doc ID:  2020011
Year of Publication:  2020
Abstract:  
Introduction: Residual stresses, those present in a material in the absence of load or changes in the temperature, can be related to the microstructure of the materials or macroscopic scale. Since shot peening creates small elastoplastic deformation on the surface and creates compressive elastic residual stresses into the depth of a part, evaluating those stresses is a key aspect of process development. We present here a refined method for using nanoindentation to map residual stresses in cross-sectioned parts. The technique is validated by both conventional x-ray methods and simulations of the double-side shot-peened thin wall sheet.