Fatigue Crack Growth of Peened Friction Stir-Welded 7075 Aluminum Alloy under Different Load Ratios

被引：0
|
作者：
Omar Hatamleh
Scott Forth
Anthony P. Reynolds
机构：
[1] NASA–Johnson Space Center,Structures Branch
[2] NASA–Johnson Space Center,Materials Branch
[3] University of South Carolina,Mechanical Engineering Department
来源：
Journal of Materials Engineering and Performance | 2010年 / 19卷
关键词：
fatigue crack growth; friction stir welding; laser peening; shot peening; stress ratio, 7075;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The effect of peening on the fatigue crack growth performance of friction stir-welded 7075 aluminum alloy was investigated. The fatigue crack growth rates were assessed for laser- and shot-peening conditions at stress ratios (R) of 0.1 and 0.7. The surface and through thickness residual stress distributions were characterized for the different regions in the weld. The results indicate a significant reduction in fatigue crack growth rates using laser peening compared to shot peening and the as-welded condition. The effect of the compressive stresses obtained through laser peening was deemed responsible for increasing the resistance to fatigue crack growth of the welds.
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页码：99 / 106
页数：7
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