Numerical modeling and experimental study of preload degradation in composite/metal threaded joint systems

doi:10.16731/j.cnki.1671-3133.2025.09.013

Modern Manufacturing Engineering ›› 2025, Vol. 540 ›› Issue (9): 99-104.doi: 10.16731/j.cnki.1671-3133.2025.09.013

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Numerical modeling and experimental study of preload degradation in composite/metal threaded joint systems

YIN Xiaojian^1,2, LI Xujian^1,2, TAO Xingwei^1,2, WANG Wenchao^1,2, LI Hao³, LIU Chang⁴

1 Henan Aerospace Precision Manufacturing Co.,Ltd.,Xinyang 464000,China;
2 Henan Provincial Key Laboratory of Fastening and Connecting Technology,Xinyang 464000,China;
3 School of Mechanical Engineering,Tianjin University,Tianjin 300354,China;
4 School of Mechanical Engineering,Tiangong University,Tianjin 300387,China

Received:2025-01-10 Online:2025-09-18 Published:2025-09-23

Abstract

Abstract: CFRP composite materials and aluminum alloy bolted structures were taken as the research objects to analyze the effects of different materials of the connected parts on the preload degradation.Based on ABAQUS/Standard software,a parametric finite element model of a real threaded bolt node was constructed to analyze the effects of different factors on the preload degradation. As the thickness of the connected parts increases,the degree of preload degradation decreases gradually. The stresses are mainly concentrated in the threaded part,and the increase in the thickness of the connected part slows down the stress degradation. Under static loading condition,the preload decayed by 6 538,5 542 and 5 437 N after 200 hours for 4.0,4.5 and 5.0 mm thicknesses of the connected parts,respectively.

Key words: bolt connection, preload degradation, CFRP composite materials, aluminum alloy

CLC Number:

V215.1

YIN Xiaojian, LI Xujian, TAO Xingwei, WANG Wenchao, LI Hao, LIU Chang. Numerical modeling and experimental study of preload degradation in composite/metal threaded joint systems[J]. Modern Manufacturing Engineering, 2025, 540(9): 99-104.

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Numerical modeling and experimental study of preload degradation in composite/metal threaded joint systems

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