多轴载荷下搅拌摩擦点焊接头的失效预测:一种失效经验模型

doi:10.11896/cldb.18090197

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Abstract As a solid phase welding technology, friction stir spot welding (FSSW) is a new process which is suitable for the joining of key components of automotive aluminum body, and the joints are in a state of significant multi-axial stress during service. In this paper, conventional FSSW welded joints were fabricated with 5052H32 and 6061T6 of automotive aluminum alloys under various joining conditions. The failure strength of multi-angle quasi-static tension was obtained by multi-axis loading tests. Thus, the macroscopic failure criterion which depended on resultant force under multi-axial load was proposed. Then the empirical criterion model of critical load was given using the power function form. The failure envelopes fitted well with the measured data, and the maximum prediction error was 11.8%. Moreover, the effect of different automotive joining conditions on static failure envelopes of FSSW joints was discussed. This empirical model provides reliable predictions for engineering applications, contributing to the strength safety evaluation and the modeling of this finite joint element.

Key words： automotive aluminum alloy friction stir spot welding(FSSW) multi-axis tensile strength empirical failure model

Published: 31 July 2019

CLC number:

U466

Fund:This work was financially supported by the National Key Research and Development Plan (2016YFB0101601-7), the Jilin Province School Co-construction Project (SXGJSF2017-2-1-5).

About author:: Biao Zhangreceived his M.S. degree in June 2017 from Guangxi University in engineering. From September 2017 to the present, he has studied mechanical engineering (body engineering) for Ph.D. in Automobile Engineering College of Jilin University, focusing on the research of lightweight connection of automotive body structures.
Xin Chen received his Ph.D.degree in vehicle engineering from Jilin University in 2008. He is currently a professor and doctoral supervisor at Automobile Engineering College of Jilin University, and participates in the research fields of vehicle structure design and lightweight as well as NVH analysis and control.

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	ZHANG Biao
	CHEN Xin
	PAN Kaixuan
	ZHAO Kangming
	YU Guishen

Cite this article:

ZHANG Biao,CHEN Xin,PAN Kaixuan, et al. Failure Prediction of Friction Stir Spot Welded Joints Under Multi-axis Loads: an Empirical Failure Model[J]. Materials Reports, 2019, 33(18): 3096-3100.

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http://www.mater-rep.com/EN/10.11896/cldb.18090197 OR http://www.mater-rep.com/EN/Y2019/V33/I18/3096

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