Fatigue assessment on 7075/2A12 aluminum alloy friction stir welding lap joints

IF 1.5 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Ruijie Wang, Zhongde Wang, Guoshou Liu
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引用次数: 0

Abstract

Constant amplitude loading fatigue tests were carried out for 7075/2A12 dissimilar aluminum alloy friction stir welding (FSW) lap joints, and the fatigue fracture characteristics were observed accordingly. Experimental observation suggested that the effective lap sheet thickness had a salient effect on the fatigue strength of the specimen. Specimens tend to fail at the lower sheet thickness under low relatively loading, while fail at the hook root at higher loading. There exists a competition between the two failure cases, and the fracture site changes with loading levels. The stress/strain at the periphery of the weld nugget were discerned by elastic and elasto–plastic finite element analyses respectively, which were then utilized to evaluate the fatigue life by local life prediction approaches and notch stress methods. Two widely used local stress approaches, the Morrow’s modified Manson-Coffin (MMC) damage model and the Smith-Watson-Topper (SWT) damage model both could give reasonable results relatively close to experimental lives within the low cycle life regime. The notch stress method could give relatively closer life in the high cycle life regime.

7075/2A12 铝合金搅拌摩擦焊搭接接头的疲劳评估
对 7075/2A12 异种铝合金搅拌摩擦焊(FSW)搭接接头进行了恒定振幅加载疲劳试验,并观察了相应的疲劳断裂特性。实验结果表明,有效搭接板厚度对试样的疲劳强度有显著影响。在低相对载荷下,试样倾向于在较低板材厚度处失效,而在较高载荷下则在钩根处失效。两种失效情况之间存在竞争,断裂部位随加载水平而变化。通过弹性和弹塑性有限元分析,分别确定了焊块外围的应力/应变,然后利用局部寿命预测法和缺口应力法评估了疲劳寿命。两种广泛使用的局部应力方法,即莫罗改进的曼森-科芬(MMC)损伤模型和史密斯-沃森-托普(SWT)损伤模型,都能在低循环寿命范围内给出相对接近实验寿命的合理结果。缺口应力法在高循环寿命范围内可给出相对接近的寿命。
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来源期刊
Journal of Mechanical Science and Technology
Journal of Mechanical Science and Technology 工程技术-工程:机械
CiteScore
2.90
自引率
6.20%
发文量
517
审稿时长
7.7 months
期刊介绍: The aim of the Journal of Mechanical Science and Technology is to provide an international forum for the publication and dissemination of original work that contributes to the understanding of the main and related disciplines of mechanical engineering, either empirical or theoretical. The Journal covers the whole spectrum of mechanical engineering, which includes, but is not limited to, Materials and Design Engineering, Production Engineering and Fusion Technology, Dynamics, Vibration and Control, Thermal Engineering and Fluids Engineering. Manuscripts may fall into several categories including full articles, solicited reviews or commentary, and unsolicited reviews or commentary related to the core of mechanical engineering.
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