Study on thermal deformation behavior of composite-aluminum alloy hybrid bolt joint under temperature load

doi:10.19936/j.cnki.2096-8000.20260328.005

Abstract

Abstract: The composite-metal connection structure of aircraft will inevitably experience high or low temperature environment during service, and the stiffness and strength properties of composites will be degraded to different degrees under the action of high and low temperature loads, and the deformation mismatch caused by internal stresses arising from thermal expansion will have an negative impact on the bolt load distribution of the connection structure, which will endanger the safety and integrity of the structure. Therefore, this paper takes the composite-aluminium alloy double-bolt single-lap connection structure as the research object, and carries out a series of high-temperature (80 ℃) and low-temperature (-40 ℃) loading tests for different composite-aluminium alloy connection structures. The hole peripheral strain change law of the connection structure under the high and low temperature ambient loading is studied, and the influences of the composite material type, the adhesive layer and the bolt spacing on the hole peripheral strain of the connection structure are discussed. The results show that influence of temperature loading on the deformation non-coordination of carbon fiber composite-aluminium alloy connection joints is very significant, and the appropriate reduction of bolt spacing and the introduction of adhesive layer between the interfaces can effectively alleviate the impact of thermal stress caused by deformation mismatch. The research results of this paper can provide a certain reference for the design of connection structure of aircraft under temperature load.

Key words: composite, aluminum alloy, connection joint, high and low temperature, hole peripheral strain

CLC Number:

TB332

YANG Xiao, HE Na, ZHU Qiang, NI Zhixiang, LIU Chong, CHEN Zhenyi, SHAO Zekai, CAI Wei, HU Haixiao, CAO Dongfeng. Study on thermal deformation behavior of composite-aluminum alloy hybrid bolt joint under temperature load[J]. COMPOSITES SCIENCE AND ENGINEERING, 2026, 0(3): 38-48.

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