Low⁃velocity Impact and Damage Detection of Epoxy/Glass and Carbon Fiber Composite Plates

doi:10.19491/j.issn.1001-9278.2021.06.008

Abstract

Abstract:

To study the influence of the position of glass fiber （G） layer on the impact damage degree of carbon fiber （C） composite panel， the impact tests were carried out for the ［CC］_2s，［CCCG］_s，［GCCC］_s and ［CCGC］_s composite plates using a drop weight impact test machine under the conditions of 15 J and 25 J impact energy， and the curves of contact force， energy and displacement as a function of time were obtained. A water immersion ultrasonic C?scan system was used to inspect the surface and internal damages of the composite plate after the impact tests. The results indicated that under the same energy impact， the growth rate of contact force of the ［GCCC］_s composite plate was higher than those of the other three types of composite plates， and the peak value of contact force was also larger than those of the other three kinds of composite plate. There was no significant difference between the maximum displacement of punch acting on the ［CC］_2s，［CCCG］_s，［GCCC］_s and ［CCGC］_s composite plates under an impact of 15 J energy. However， the glass fiber appeared on the outer surface of the composite sheet under the 25 J energy impact， and the displacement of the punch was the smallest. This indicated that the impact resistance of glass fiber was improved remarkably with an increase in impact energy. In addition， the damage area of glass fiber on the surface was smaller than those of the other three composite sheets， indicating that the toughness of glass fiber was higher than that of other composite plates due to its better capability to inhibit damage diffusion.

Key words: glass fiber, carbon fiber, composite plate, low?velocity impact, ultrasonic C?scan, damage area

CLC Number:

TQ327

HUANG Zhichao, LUO Qiang, LAI Jiamei, LIU Shuaihong. Low⁃velocity Impact and Damage Detection of Epoxy/Glass and Carbon Fiber Composite Plates[J]. China Plastics, 2021, 35(6): 46-52.

Figures/Tables 11

Fig.1. VARTM process diagram

Fig.2. Production of VARTM

Fig.3. Impact samples

Fig.4. INSTRON CEAST9340 clamping device of impact testing machine

Fig.5. Contact force?time curves at dfferent impact energy

Fig.6. Energy absorption?time curves at dfferent impact energy

Fig.7. Displacement time curves at dfferent impact energy

Fig.8. Maximum displacement of punch under different energy impact

Fig.9. Impact damage at different energy

Fig.10. Damage of different composite plates at different depths under 25 J impact energy

Fig.11. SEM of impact cross section of composite plates

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