高温老化对CFRP/铝合金粘接接头失效的影响

doi:10.13229/j.cnki.jdxbgxb20180530

Abstract

Abstract:

To reveal the degradation rules of adhesively bonded Carbon Fiber Reinforced Plastic (CFRP)/aluminum alloy subjected to high temperature environment, adhesive joints under shear, normal and combined shear and normal stress states were manufactured, and degraded at 80 ℃ (high temperature) for 10, 20, 30, 40, 50 days. The failure strength and failure mode were analyzed, and a response surface of failure criterion was built for the failure prediction. Results show that with increasing proportion of normal stress, the failure strength decreases more obviously and the failure mode changes from cohesive failure to mixed failure of fiber tear, interface and cohesive, which is mainly caused by the degradation of CFRP. The average relative errors of the response surface of failure criterion is about 3.0%, which can be used to predict the failure of adhesive joints under different stress states. Therefore, it is necessary to reduce the proportion of normal stress in adhesively bonded CFRP/aluminum alloy joints to improve the load capacity. Besides, the effect of fiber tear has to be taken into consideration in the failure prediction of CFRP/aluminum alloy joints.

Key words: vehicle engineering, adhesive joints, high temperature degradation, failure rule

CLC Number:

U463.82

Guo⁃feng QIN,Jing⁃xin NA,Wen⁃long MU,Wei TAN,Jian⁃ze LUAN,Hao SHEN. Degradation failure of adhesively bonded CFRP/aluminum alloy subjected to high temperature environment[J].Journal of Jilin University(Engineering and Technology Edition), 2019, 49(4): 1063-1071.

Figures/Tables 13

Table 1

Material properties of CFRP"

	$E x$ /GPa	$E y$ /GPa	$G x y$ /GPa	$ν x y$
单向	$125 ± 12$	$10 ± 2$	$7 ± 0.6$	0.07
斜纹	$55 ± 5$	$55 ± 5$	$4 ± 0.5$	0.14

Table 1

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Degradation failure of adhesively bonded CFRP/aluminum alloy subjected to high temperature environment

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