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| Research on Fatigue Life of Aluminum Alloy With Fastener Hole by Laser Shock Processing |
| ZHAO Yong1, JIANG Yinfang2, PENG Taotao2, WAN Quanhong1 |
( 1. AVIC Chengdu Aircraft Design & Research Institute, Chengdu 610000, China；
2. School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China ) |
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Abstract The effect on fatigue life and fracture morphology of 7050-T7451 aluminum alloy hole by laser shock
processing (LSP) was investigated. ABAQUS was used to study the stress distribution of hole wall path and surface path
of the hole under different peak pressures. The LSP test and the fatigue tensile test were carried out based on the simulation
results. The results show that laser double-sided shock processing on the sides of the sheet forms a depth of residual compressive
stress layer, and in the center forms a range of residual tensile stress layer, which is also the main reason for the
transfer of fatigue source froms the hole angle to center of the hole wall. Under the stress level of 165.8MPa, 195.0MPa and
275.4MPa, the fatigue life of the samples increased by 451%, 216% and 116% respectively. After LSP, the fatigue source
position of the sample is transferred from the hole angle to the inside of the pore wall, and the area of fatigue crack area is
obviously increased. The research show that LSP can obviously improve the fatigue properties of the aluminum alloy with
fastener hole, but the strengthening effect decreases with the increase of the external load.
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2017, 
