| RESEARCH PAPER |
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| Fatigue Properties and Failure Mechanisms of Self-piercing Riveted T Joints in Aluminum-Lithium Alloys |
| CHENG Qiang, HE Xiaocong, XING Baoying, ZHANG Yue
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| Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500 |
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Abstract In order to study the fatigue properties of self-piercing riveted(SPR) T joints, three sets of T joints (1420 aluminum-lithium alloys joined with itself (AA joints), with H62 copper alloys (HA joints) and with 410 stainless steel(SA joints)) were prepared. Fatigue test were conducted on the basis of peeling test. The effectiveness of test data was analyzed by two-parameter Weibull distribution, and the equations of fatigue load-fatigue life curves were calculated by least square method. Scanning electron microscope was adopted to observe the appearance of the joints fracture. The results show that the fatigue life of SA joints was the most sensitive to the load fluctuation which were loaded on joints, and fatigue life decreased with the increasing relative slippage. The weak point of the joints transferred from rivets to sheets. From micro-view, the fracture features of crack initiation region is flatter than the fracture features of crack transient zone which are mainly the intergranular fracture or the dimple.
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Published: 25 June 2017
Online: 2018-05-08
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2017, Vol. 31 
