Paper Title:

Study on the Improvement of Fatigue Crack Growth Performance of 6061-T6 Aluminum Alloy Subject to Laser Shot Peening

Periodical Key Engineering Materials (Volume 464)
Main Theme Functional Manufacturing Technologies and Ceeusro II
Edited by Long Chen, Yongkang Zhang, Aixing Feng, Zhenying Xu, Boquan Li and Han Shen
Pages 391-394
DOI 10.4028/www.scientific.net/KEM.464.391
Citation Cheng Dong Wang et al., 2011, Key Engineering Materials, 464, 391
Online since January, 2011
Authors Cheng Dong Wang, Jian Zhong Zhou, Shu Huang, X.D. Yang, Z.C. Xu, Hong Yan Ruan
Keywords Fatigue Crack Growth, Laser Shot Peening, Numerical Simulation, Residual Stress
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Abstract

In order to enhance mechanical property and restrain crack growth of 6061-T6 aluminum alloy, laser shot peening (LSP) was employed to induce compressive residual stress and plastic deformation on the surface of metal. The FEA code ABAQUS and MSC. Fatigue were used to simulate crack growth of Compact tension (CT) specimens treated by LSP. The numerical simulation results showed that LSP can effectively inhibit the crack growth, decrease the crack growth rate as well as increase the final crack size, and as a consequence, fatigue life was extended. Adding peening times could get deeper compressive residual stress field which strengthen material surface and restrain crack growth, but the fatigue stress intensity factor threshold decreases.