Progressive damage study of composite countersunk head bolt lap structures under thermal mechanical coupling

doi:10.19936/j.cnki.2096-8000.20220328.001

Abstract

Abstract: This paper presents a numerical study of the damage expansion process and strength of composite laminates with countersunk head bolted connections. A new three-dimensional progressive damage model is developed to predict the load carrying capacity and damage extension of composite countersunk bolt lap structures under the combined effects of temperature and bolt torque. The model integrates the composite constitutive equations considering thermal strain, failure and material degradation criteria, temperature-induced stiffness and strength correction parameters into the VUMAT subroutine, and quasi-static simulations using a thermal mechanical coupling approach. The results show that the progressive damage model can accurately predict the influence of temperature and bolt torque on the ultimate load carrying capacity of the lap joint structure, and can clearly reflect the failure mechanism and damage extension process. As the temperature rises, the ultimate load bearing strength of the lap structure decreases when the torque exceeds 15 N·m. The laminate fibre damage is mainly influenced by the 0° directional load, the laminate matrix damage is mainly influenced by the 90° directional load, and the failure unit extends along the applied load direction to the free boundary failure.

Key words: composite materials, countersunk bolt connection, VUMAT, temperature, bolt torque, progressive damage model

CLC Number:

TB332

YU Fen, LIU Guo-feng, HE Zhen-peng, JIN Wei, LI Bai-chun, SUN Ai-jun, QIAN Jun-ze, ZHANG Gui-chang. Progressive damage study of composite countersunk head bolt lap structures under thermal mechanical coupling[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(3): 5-14.

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