Fatigue Behavior of Dissimilar 5754/7075 and 7075/5754 Spot Friction Welds in Lap-Shear Specimens

被引：0
|
作者：
Tran, V. -X. [1 ]
Pan, J. [1 ]
Pan, T. [2 ]
机构：
[1] Univ Michigan, Ann Arbor, MI 48109 USA
[2] Oakland Community Coll, Oakland, CA USA
来源：
SAE INTERNATIONAL JOURNAL OF MATERIALS AND MANUFACTURING | 2010年 / 3卷 / 01期
基金：
美国国家科学基金会;
关键词：
D O I：
10.4271/2010-01-0961
中图分类号：
U [交通运输];
学科分类号：
08 ; 0823 ;
摘要：
Fatigue behavior of spot friction welds or friction stir spot welds in lap-shear specimens of dissimilar aluminum 5754-O and 7075-T6 sheets is investigated based on experimental observations and two fatigue life estimation models. Optical micrographs of the 5754/7075 and 7075/5754 welds after failure under cyclic loading conditions are examined to understand the failure mechanisms of the welds. The micrographs show that the 5754/7075 welds mainly fail from the kinked fatigue crack through the lower sheet thickness. Also, the micrographs show that the 7075/5754 welds mainly fail from the kinked fatigue crack through the lower sheet thickness and from the fracture surface through the upper sheet thickness. A kinked fatigue crack growth model based on the stress intensity factor solutions for finite kinked cracks and a structural stress model based on the closed-form structural stress solutions are adopted to estimate the fatigue lives of the 5754/7075 and 7075/5754 welds in lap-shear specimens. The fatigue life estimations based on the kinked fatigue crack growth model and the structural stress model agree well with the experimental results.
引用
收藏
页码：608 / 614
页数：7
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