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This study investigates the response characteristics of the first-order modal frequency of 100 × 150 × 4 mm epoxy resin/carbon fiber composite plates under varying impact energies (0–45 J, with a 5 J increment) through drop-weight impact tests. The influence of pre-treatment at -10 ℃ on the frequency evolution characteristics is also analyzed. Experimental results reveal that within the impact energy range of 5–20 J, the first-order frequency exhibits a nonlinear trend of first increasing and then decreasing. In the 20–35 J range, a significant linear positive correlation with impact energy is observed, with the frequency reaching a peak at 35 J before slightly declining. After -10 ℃ pre-treatment, the frequency under 25 J impact significantly decreases compared to 20 J, while it recovers at 30 J but remains lower than the 35 J treatment result. Notably, the first-order frequency of the temperature-treated specimen under 35 J impact remains the highest, demonstrating the temperature's regulatory role in the material's damage evolution path. This study provides theoretical insights for impact damage assessment and structural design of composite materials under extreme temperature conditions.

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Construction and Verification of Modal Damage Model for Carbon Fiber Composite Materials Under Temperature-Shock Coupling Action

  • 会议论文

  • 发表日期：

    2026年

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  • Ziliang Xia,
  • Hongfei Zu,
  • Tianming Ju,
  • Jingxiao Huang

摘要

This study investigates the response characteristics of the first-order modal frequency of 100 × 150 × 4 mm epoxy resin/carbon fiber composite plates under varying impact energies (0–45 J, with a 5 J increment) through drop-weight impact tests. The influence of pre-treatment at -10 ℃ on the frequency evolution characteristics is also analyzed. Experimental results reveal that within the impact energy range of 5–20 J, the first-order frequency exhibits a nonlinear trend of first increasing and then decreasing. In the 20–35 J range, a significant linear positive correlation with impact energy is observed, with the frequency reaching a peak at 35 J before slightly declining. After -10 ℃ pre-treatment, the frequency under 25 J impact significantly decreases compared to 20 J, while it recovers at 30 J but remains lower than the 35 J treatment result. Notably, the first-order frequency of the temperature-treated specimen under 35 J impact remains the highest, demonstrating the temperature's regulatory role in the material's damage evolution path. This study provides theoretical insights for impact damage assessment and structural design of composite materials under extreme temperature conditions.