Numerical study of failure behavior of glass fiber composite material and aluminum alloy double-bolt hybrid joint under tensile loading

doi:10.19936/j.cnki.2096-8000.20250528.003

Abstract

Abstract: The design of the joint between composite and metal material is a key critical problem in aircraft structural design. It is of great significance to deeply study the mechanical properties and failure modes of composite and metal mechanical connection structures to improve the safety and reliability of aircraft composite and metal hybrid structures. Therefore, this paper established a numerical failure prediction model for the double-bolt hybrid joint of orthogonal braided GFRP laminates and an aluminum alloy plate subjected to tensile loading based on the finite element method. The related finite element simulation analysis and model tests were carried out. The comparison of numerical and experimental results show that the presented numerical model has high accuracy. On this basis, combined with the experimental and numerical results, the differences on failure modes and load bearing capacities between the pure bolted joint and the bonded-bolted hybrid joint under tensile loading were investigated. It is found that the adhesive layer of bonded-bolted hybrid joint can reduce the stress concentration near the bolt hole and improve the stiffness of the whole connection structure. Moreover, the load bearing capacity of bonded-bolted hybrid joint increases by 27.8% compared to pure bolted joint. The research results can provide some useful references for the design of composite-metal connection structure.

Key words: GFRP, aluminum alloy, joint, finite element simulation, failure mode, load bearing capacity

CLC Number:

TB332

YANG Xiao, HE Na, XIAO Peng, ZHU Qiang, CAI Wei, HU Haixiao, CAO Dongfeng. Numerical study of failure behavior of glass fiber composite material and aluminum alloy double-bolt hybrid joint under tensile loading[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(5): 22-30.

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