The fatigue fracture mechanism of Al7075 aluminum alloy clinching joints

Author:

Zhang Yue12,Lu Yan1ORCID,Peng Ruitao12ORCID,Xu Honghe1,Zhu Linwei1,Wang Tao1

Affiliation:

1. School of Mechanical Engineering and Mechanic, Xiangtan University, China

2. Postdoctoral Flow Station of Mechanics, Xiangtan University, China

Abstract

Lightweight aluminum alloys are widely used in automotive structural parts. Clinching (press-joining) is one of the most promising alternatives to welding for joining aluminum alloys, and as the failure of the joint is mainly caused by fatigue, the fatigue properties of the clinched joints directly affect the reliability and safety of the connected specimens. To gain a deeper understanding of this phenomenon, the static mechanical and fatigue properties of Al7075 aluminum alloy single-lap clinched joints were studied using static strength and tensile-tensile fatigue tests. The F–N curves of the joints were fitted using a straight-line and three-parameter power function method. The fractured samples and wear scars were analyzed by scanning electron microscopy and energy-dispersive spectroscopy. The results showed that the neck of the clinched joint and the upper sheet near the joint experienced the highest degree of fatigue fracture, the fretting wear debris consisted mainly of alumina and metallic aluminum, and the fretting wear was of a mode that differed from the two modes identified in the literature that we have dubbed “upper sheet inter-sheet region fretting wear.”

Funder

National Natural Science Foundation of China

Outstanding Postdoctoral Innovative Talents Program of Hunan Province

Publisher

SAGE Publications

Subject

Mechanical Engineering,General Materials Science

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Mechanical properties and microstructure of aluminum alloy 7075-T6 spot-welding joint;Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering;2023-09-04

2. Research advances in fatigue behaviour of clinched joints;The International Journal of Advanced Manufacturing Technology;2023-05-10

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