Comparison Between Vibratory Peening and Shot Peening Processes

Author:  Hongyan Miao, Leo Canals, Brian McGillivray, Martin Lévesque
Source:  ICSP-13
Doc ID:  2017124
Year of Publication:  2017
Introduction: Vibratory finishing is a surface treatment in which components are inserted in an oscillating bowl containing polishing media. The media flow around the component polishes its surface and decreases its roughness [1-3]. Shot peening (SP) is another surface treatment that involves projecting hard particles onto a components surface, at high velocity. These impacts induce surface compressive residual stresses which increase fatigue life. However, the process increases surface roughness, which have a detrimental effect on fatigue life. Vibratory finishing is often used after shot peening to improve the surface finish. Vibratory peening (VP) is a relatively new process that relies on the same principles as vibratory finishing for inducing compressive residual stresses like those induced by shot peening. The process combines the improved surface finish from vibratory finishing and compressive residual stresses induced by shot peening, which should deliver better fatigue lives than conventional methods. While the effects of shot peening on fatigue life have been extensively studied in the literature, very few authors studied the fatigue life improvement induced by vibratory peening [4, 5]. The process is relatively new and high technology industries, like aerospace, require sound investigations of the underlying fundamental mechanisms involved in the process before considering investing in more extensive studies that would eventually lead to the process acceptance. Objectives

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