Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (4): 1063-1071.doi: 10.13229/j.cnki.jdxbgxb20180530

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

Guo⁃feng QIN1,2(),Jing⁃xin NA1(),Wen⁃long MU1,Wei TAN1,Jian⁃ze LUAN1,Hao SHEN1   

  1. 1. State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China
    2. Teachers College for Vocational and Technical Education, Guangxi Normal University, Guilin 541004,China
  • Received:2018-05-27 Online:2019-07-01 Published:2019-07-16
  • Contact: Jing?xin NA E-mail:qinguofengjlu@163.com;najx@jlu.edu.cn

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

Table 1

Material properties of CFRP"

Ex/GPaEy/GPaGxy/GPaνxy
单向125±1210±27±0.60.07
斜纹55±555±54±0.50.14

Fig.1

Dimensions of adhesive joints"

Fig.2

Schematic diagrams of test"

Fig.3

Work fixture"

Fig.4

Failure strength of adhesive joints as a function of degradation time"

Fig.5

Fitting results of failure strength of adhesive joints varying with degradation time"

Fig.6

Representive fracture surfaces of TSJs after different aging time"

Fig.7

Representive fracture surfaces of SJ45° after different aging time"

Fig.8

Representive fracture surfaces of BJs after different aging time"

Fig.9

SEM fracture surfaces of fiber tear"

Fig.10

Failure criteria of CFRP/aluminum alloy adhesive joints after different degradation time"

Fig.11

Fitting precision of failure criteria after different degradation time"

Fig.12

Response surface of failure criteria as function of degradation time"

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