| METALS AND METAL MATRIX COMPOSITES |
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| Fatigue Properties and Failure Mechanisms of Self-piercing Riveted Joints in Metal Foam Sandwich Structures |
| LIU Yang, HE Xiaocong, XING Baoying, DENG Cong, ZHANG Xianlian
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| Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500 |
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Abstract Fatigue experiments were carried out on the self-piercing riveted (SPR) joint of aluminum alloy and the foam metal sandwich structures. Based on the three parameter empirical formula, S-N curve fitting method was used to draw the F-N curves of the joints. The fatigue life of the joints and the influence of the metal foam interlayers on the fatigue properties of the SPR joint were analyzed. The fatigue failure fracture of the joints was observed by scanning electron microscope (SEM), and the microscopic failure mechanism was analyzed. The results show that the metal foam interlay reduces the fatigue life of the SPR joint, and different metal foam has the different influence on fatigue performance of SPR joint. Under the high fatigue load, the copper foam sandwich joint has better fatigue performance. The fatigue failure modes of the three groups of joints are the lower sheet fracture, and the cracks easily occur in the locked region under the high fatigue load. The crack initiates at one side of the lower sheet under the low fatigue load, and extends to the other side of the sheet along the underside of the locked region.
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Published: 31 July 2018
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1 Banhart J. Manufacture, characterisation and application of cellular metals and metal foams[J]. Progress in Materials Science,2001,46(6):559.
2 Crupi V, Epasto G, Guglielmino E. Impact response of aluminum foam sandwiches for light-weight ship structures[J]. Metals,2011,1(1):98.
3 Raj S V, Ghosn L J. Failure maps for rectangular 17-4PH stainless steel sandwiched foam panels[J]. Materials Science & Engineering A,2007,474(1):88.
4 Degischer, Hans-Peter. Handbook of cellular metals: Production, processing, applications[M]. German: Wiley-VCH,2002:98.
5 He X C, Pearson I, Young K. Self-pierce riveting for sheet mate-rials: State of the art[J]. Journal of Materials Processing Technology,2008,199(1-3):27.
6 Ueda M, Miyake S, Hasegawa H, et al. Instantaneous mechanical fastening of quasi-isotropic CFRP laminates by a self-piercing rivet[J]. Composite Structures,2012,94(11):338.
7 Mori K, Abe Y, Kato T. Mechanism of superiority of fatigue strength for aluminium alloy sheets joined by mechanical clinching and self-pierce riveting[J]. Journal of Materials Processing Techno-logy,2012,212(9):1900.
8 Chun C S, Kim H K. Fatigue strength of self-piercing riveted joints in lap-shear specimens of aluminium and steel sheets[J]. Fatigue & Fracture of Engineering Materials & Structures,2016,39(9):1105.
9 Huang L, Shi Y, Guo H, et al. Fatigue behavior and life prediction of self-piercing riveted joint[J]. International Journal of Fatigue,2016,88:96.
10 He X C, Deng C, Zhang X L. Fretting behavior of SPR joining dissimilar sheets of titanium and copper alloys[J]. Metals,2016,6(12):312.
11 Cheng Qiang, He Xiaocong, Xing Baoying, et al. Fatigue properties and failure mechanisms of self-piercing riveted T joints in aluminum-lithium alloys[J]. Materials Review B:Research Papers,2017,31(6):84(in Chinese).
程强,何晓聪,邢保英,等.铝锂合金T型自冲铆接头疲劳特性及失效机理[J].材料导报:研究篇,2017,31(6):84.
12 Zhang J, Yang S. Self-piercing riveting of aluminum alloy and thermoplastic composites[J]. Journal of Composite Materials,2015,49(12):1493.
13 Gao Zhentong, Fu Huimin, Liang Meixun. A method for fitting S-N curve[J]. Journal of Beijing Institute of Aeronautics and Astronautics,1987(1):115(in Chinese).
高镇同,傅惠民,梁美训.S-N曲线拟合法[J].北京航空学院学报,1987(1):115. |
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2018, Vol. 32 
