Volume 21 Issue 5
Nov.  2021
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2021  >  21(5): 149-160
QIN Guo-feng, MI Pei-wen, NA Jing-xin. Effect of moisture absorption of adhesive and CFRP on the failure of composite material adhesive joints[J]. Journal of Traffic and Transportation Engineering, 2021, 21(5): 149-160. doi: 10.19818/j.cnki.1671-1637.2021.05.013
Citation: QIN Guo-feng, MI Pei-wen, NA Jing-xin. Effect of moisture absorption of adhesive and CFRP on the failure of composite material adhesive joints[J]. Journal of Traffic and Transportation Engineering, 2021, 21(5): 149-160. doi: 10.19818/j.cnki.1671-1637.2021.05.013
shu

Effect of moisture absorption of adhesive and CFRP on the failure of composite material adhesive joints

doi: 10.19818/j.cnki.1671-1637.2021.05.013
  • 1.

    Teachers College for Vocational and Technical Education, Guangxi Normal University, Guilin 541004, Guangxi, China

  • 2.

    State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, Jilin, China

Funds:

National Natural Science Foundation of China 52102473

National Natural Science Foundation of China 51775230

Guangxi Science and Technology Project GuikeAD20159010

More Information
  • Author Bio:

    QIN Guo-feng(1990-), male, assistant professor, PhD, qinguofeng@gxnu.edu.cn

  • Received Date: 2021-05-09
    Available Online: 2021-11-13
  • Publish Date: 2021-10-01
    Abstract
  • The effects of adhesive and composite materials were decoupled. Adhesive, carbon fiber reinforced plastic (CFRP), and CFRP/aluminum alloy adhesive joints were immersed in water at room temperature for different durations, and the effect of different stress states on the failure of adhesive joints was investigated. Analysis of the failure strength and failure mode of the quasi-static failure test was the main method, combined with the chemical analysis of Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The failure mechanisms of adhesive and CFRP after moisture absorption were studied, and the effect of moisture absorption on the failure mechanism of composite material adhesive joints was revealed. Analysis results show that the adhesive is hydrolyzed after 30 d moisture absorption, the failure strength decreases by approximately 53.7%, and the failure strain is approximately 3.2 times of the adhesive without moisture absorption. Interface failure of CFRP occurs because of the decrease in the adhesivity after moisture absorption, but it improves after polishing. The mechanical properties of the fiber/matrix interface decreases after moisture absorption, which caused the fiber tear of CFRP to be subjected to a normal stress state. The failure strength of CFRP/aluminum alloy adhesive joints decreases by approximately 23%, and ductile fracture and interface failure of the fracture surface of the adhesive occurs after moisture absorption for 30 d. Through the failure analysis of adhesive, CFRP, and CFRP/aluminum alloy adhesive joints after moisture absorption, it's determined that the failure of CFRP/aluminum alloy adhesive joints under shear stress is mainly affected by the performance reduction of the adhesive after moisture absorption, and the interface failure is the secondary cause. The failure of CFRP/aluminum alloy adhesive joints under normal stress is also influenced by the fiber tear of the CFRP owing to the performance reduction. 3 tabs, 20 figs, 30 refs.

     

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