Effect of electrophoretic baking on mechanical properties of EP/CF and EP/CF/GF composites

doi:10.19491/j.issn.1001-9278.2024.03.001

Abstract

Abstract:

A series of CFRP with different laminating modes was prepared through VARTM， which included the EP/CF and EP/CF/GF composites. Their mechanical properties before and after electrophoretic baking were compared， and their failure mechanism was explored. The results indicated that the ［±45 °］ laminating method and the addition of GF mat increased the permeability of the composite system significantly. After electrophoretic baking， the tensile strength of the CF［0/90 °］， CF［±45 °］， and CF/GF［±45 °］ composites decreased by 15.65 %， 12.05 %， and 6.77 %， respectively， and their modulus decreased by 9.08 %， 16.39 %， and 10.04 %， respectively. The tensile strength and modulus of the CF/GF［0/90 °］ composite increased by 7.74 % and 6.95 %， respectively. According to the flexural performance after electrophoretic baking， the flexural strength of the CF［0/90 °］， CF/GF［0/90 °］， CF［±45 °］， and CF/GF［±45 °］ composites decreased by 7.62 %， 8.23 %， 15.89 %， and 48.39 %， respectively， and their modulus decreased by 9.23 %， 3.69 %， 17.85 %， and 34.38 %， respectively. There was little effect of electrophoretic baking on the compression performance of these four composite systems. After electrophoretic baking， the energy storage modulus and loss modulus of the CF［0/90 °］ and CF［±45 °］ composites increased， whereas the CF/GF［0/90 °］ and CF/GF［±45 °］ composites showed a decrease in these two moduli.

Key words: carbon fiber reinforced plastic, vacuum?assisted resin transfer molding, permeability, electrophoretic baking

CLC Number:

TQ323.5

CUI Xiaofeng, FANG Mei, DU Songlin, ZHANG Na, HUANG Ming, GAO Guoli, XU Jingwei. Effect of electrophoretic baking on mechanical properties of EP/CF and EP/CF/GF composites[J]. China Plastics, 2024, 38(3): 1-6.

Figures/Tables 9

Fig.1. Schematic diagram of VARTM

Fig.2. Schematic diagram of fiber layering

Fig.3. The square of the resin flow distance as a function of time

Fig.4. Tensile properties of CFRP samples before and after electrophoretic baking

Fig.5. Flexural properties of CFRP samples before and after electrophoretic baking

Fig.6. Compressive properties of CFRP samples before and after electrophoretic baking

Fig.7. Energy storage modulus， loss modulus and loss factor of CF［0/90 °］ and CF/GF［0/90 °］ before and after electrophoresis

Fig.8. Energy storage modulus， loss modulus and loss factor of CF ［±45 °］ and CF/GF ［±45 °］ before and after electrophoresis

Fig.9. SEM of tensile fracture of ［0/90 °］ CFRP samples before and after electrophoretic baking

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