Affiliation:
1. School of Mechanical and Electronic Engineering, Central South University of Forestry and Technology, Changsha 410083, China
Abstract
This study explores the impact of shot peening residual compressive stress on repairing surface cracks in the 7075-T651 aluminum alloy. Two models were developed for crack repair via shot peening and fatigue test finite element modeling. A multi-step numerical simulation introduced shot peening-induced residual stress into the fatigue test model, and subsequent simulations analyzed the crack repair mechanism. The research results indicate that increasing pressure and projectile size improve repair effectiveness, but higher pressure causes material damage, and larger projectiles decrease fatigue life. Crack repair effectiveness decreased with higher loading levels, more significantly at higher loads. Experimental and simulation results matched well, validating the simulation model for shot peen repair processes and offering optimization possibilities.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces