Experimental Fatigue Life Quantification of the Effect of Blending Surface Damage on Shot-Peened Aluminum Specimens
Maxime Lapalme, Marc Ouellet, Guillaume Biron
May 8, 2017

Experimental Fatigue Life Quantification of the Effect of Blending Surface Damage on Shot-Peened Aluminum Specimens
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Experimental Fatigue Life Quantification of the Effect of Blending Surface Damage on Shot-Peened Aluminum Specimens
Authors / Details: Maxime Lapalme, Marc Ouellet, Guillaume BironAbstract
This paper presents the results of an experimental test program aimed at the investigation of the effect on fatigue life of blending surface damage on shot-peened parts. The test program was performed on shot-peened aluminum specimens where a surface damage was introduced on the specimen by machining a notch after the shot-peening operation. This notched area was then blended to a smooth surface before performing a four point bending fatigue test. The results showed little detrimental effect of the blending operation and, in some cases, improvement on the fatigue life of the specimen compared to a baseline shot-peened and undamaged specimen. These results were investigated with fractography, residual stress measurement using X-ray diffraction and a Discrete Element Model (DEM) - Finite Element Model (FEM) to simulate the blending and assess the redistribution of the residual stresses in the specimens.