Damage mechanism of carbon⁃fiber⁃reinforced polymeric composites under electric⁃wet coupling action

doi:10.19491/j.issn.1001-9278.2022.10.006

Abstract

Abstract:

In this paper， the damage mechanism of carbon⁃fiber⁃reinforced polymeric composites with an aviation structure was studied under the electro⁃wet coupling multiple fields. The electro⁃wet coupling environment⁃test platform was used to perform an electro⁃wet coupling treatment for the composites. The surface temperature of the composite samples was monitored in real time， and the evolution rule of the surface temperature with current intensity and electrification time was obtained. Moreover， a change in weightlessness rate under different current intensity was also obtained for the composite samples. The bending properties of the composite samples treated with different environmental conditions were measured， and their fracture morphology and surface morphology were observed and analyzed. The results indicated that the higher the energization current intensity， the higher is the stable surface temperature of the composite samples. The surface stable temperature of the composite samples increased with an increase in energization time at the same current value， and the moisture absorption tended to be greater than the dehumidification. After the 10 A electric⁃wet coupling treatment for 96 h， the composite samples reached the equilibrium of moisture absorption and dehumidification， and the samples after 12 A and 15 A electric⁃wet coupling treatment presented different mass losses. After the electro⁃wet coupling treatment at different current intensities， the sample interface was damaged to a certain extent. This makes the bending strength decrease， and the decrease range is positively correlated with the current intensity.

Key words: composite, electrothermal response, weightlessness rate, flexural performance, interfacial property

CLC Number:

TQ327.3

WANG Zhiping, CHEN Hao, LU Pengcheng. Damage mechanism of carbon⁃fiber⁃reinforced polymeric composites under electric⁃wet coupling action[J]. China Plastics, 2022, 36(10): 39-45.

Figures/Tables 7

Fig.1. CFRP specimen of carbon fiber reinforced resin matrix composite material and CFRP specimen with end face coated with conductive silver glue

Fig.2. Cycle times and temperature changes of electric⁃wet coupling treatment under different environmental conditions

Fig.3. The change of specimen weight loss rate with time under different current values of electric⁃wet coupling treatment

Fig.4. Flexural strength of CFRP specimens before and after electric⁃wet coupling treatment

Fig.5. Bending failure characteristics of CFRP specimens treated with different environmental conditions

Fig.6. The micro⁃morphology of the side surface of the sample after treatment under different environmental conditions

Fig.7. Micro⁃morphology of the cross⁃section perpendicular to the fiber direction of the samples under different environmental conditions

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