| METALS AND METAL MATRIX COMPOSITES |
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| Mechanical Performance and Fretting Behavior of Self-piercing Riveted Joint of TA1 Titanium Alloy |
| ZHAO Lun1,2, HE Xiaocong1, ZHANG Xianlian1, DING Yanfang1, LIU Yang1, DENG Cong1
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1 Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500;
2 Department of Mechanical Engineering, Blekinge Tekniska Högskola, Karlskrona 37179; |
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Abstract The present work mainly focused on the self-piercing riveted (SPR) joint of TA1 titanium alloy. The tensile-shear test and fatigue test were conducted to analyze the mechanical performance of the joints, and the tensile-shear failure mechanism, fatigue failure mechanism and fretting behavior of the joints were investigated at a microscopic level by scanning electron microscope. The results exhibited that the tensile-shear failure mode assumed rivet shank pull-out from the bottom sheet and some degree of fracture located at the rivet neck, while the main fatigue failure mode was fracture of the upper sheet whose fatigue limit was approximately 1.18 kN. Fatigue cracks initiated at pierced sheet surface’s contact site with rivet head, and were propagated along the sheet thickness direction and sheet width direction under continuous fretting wear and fatigue cyclic stress, and finally resulted in joint break. The severity of fretting wear could influence fatigue failure mode of the joints. Fretting wear of the upper sheet initiated from W direction of sheet width, and spread gradually to L direction of sheet length with fretting wear process.
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Published: 22 November 2018
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2018, Vol. 32 
