1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110004, China;
2. Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China
Abstract：The influence of shot peening on the tension-tension fatigue properties of 2XXX aluminum alloy was studied. The microstructure, microhardness, residual stress and tension-tension fatigue performance of the specimens were analyzed,before and after shot peening.The results show that the structure and microstructure of the specimens have no obvious change,but the roughness,residual compressive stress and microhardness increase obviously, which are 6.25, 3.85, 1.12 times respectively of samples without shot peening. The tension-tension fatigue properties improve greatly,average life of the shot peening specimens is 1.67 times of that specimens without shot peening. Under 99.9% survival rate, the safety life of specimens after shot peening is 1.45 times of that specimens without shot peening. After shot peening, the fatigue crack source on the surface changes to one source from multi sources.
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