Effects of Shot Peening on Fatigue Crack Initiation and Propagation Performance of Aeronautical Materials

Author:  Yukui Gao
Source:  ICSP-13
Doc ID:  2017083
Year of Publication:  2017
Abstract:  
Introduction: Many high strength or ultrahigh strength metallic materials are used in the aircraft industryto manufacture the main components, such as landing gears, wings or engine parts including engine disc or blades. For these metallic alloys, the fatigue properties are affected mainly by surface treatments. To improve the fatigue properties, surface enhancement processes are applied to modify the surface integrity. Surface integrity is a comprehensive concept and it includes many aspects of surface. In the views of fatigue property, the main parameters of surface integrity are residual stresses in surface layer, surface roughness and microstructure [1]. The structural integrity is mainly determined by surface integrity because many fractures occur at surfaces, especially at some defects.