3钉带衬套复合材料/金属接头拉伸疲劳性能试验研究

doi:10.11896/cldb.20090226

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Abstract Countersunk bolt joints with sleeves have been used in composite connection structures, and the fatigue properties need to be studied. In this study,a static tensile test is carried out on a single lap CFRP/titanium alloy bolted joint with 3-countersunk head bolt and sleeves, and the load-displacement curves, ultimate tensile strength and off-set bearing strength of the joint are measured. On this basis, 67% of the joint’s ultimate load is determined as the maximum tensile fatigue load. The joint is tested with a stress ratio of 0.1 and compared with the joint without sleeves to investigate the sleeves’ influence on the joint’s fatigue performance. The results show that the use of the sleeves improves the stress distribution and increases the fatigue life of the structure by 98.4%. At the same time, hole bearing and net section tensile failure of the laminate occurred in the static tensile test. In the fatigue test, tensile fatigue failure of the titanium alloy plate occurred, and bolt fatigue fracture also occurred in some joints without sleeves. It is found that the fatigue failure mode of the composite/metal mechanical joint varies with the load level due to the large differences in the fatigue performance of the two types of materials, and the metal structure is prone to damage when the load is lower a certain level.

Key words： composite material bolted joint single lap countersunk bolt with sleeve tensile fatigue

Published: 12 November 2021

CLC number:

V214

Corresponding Authors: xiaoquan_cheng@buaa.edu.cn

About author:: Ziqian An, postgraduate of Beihang University, focusing on the research of structural analysis and design technology of composite materials.
Xiaoquan Cheng received his Ph.D. degree in aircraft design and engineering from Beihang University (BUAA) in 1998. He is currently a professor in School of Aeronautical Science and Engineering of BUAA. His research interests are damage tolerance design and ana-lysis technology of composite structures of aircraft structures.

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	AN Ziqian
	SHU Maosheng
	CHENG Yujia
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	CHENG Xiaoquan

Cite this article:

AN Ziqian,SHU Maosheng,CHENG Yujia, et al. Experimental Study on Tensile Fatigue Properties of Composite/Metal Bolted Joints with 3-pin and Sleeves[J]. Materials Reports, 2021, 35(20): 20081-20086.

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http://www.mater-rep.com/EN/10.11896/cldb.20090226 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20081

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