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<p>The structural impact resistance reliability of carbon fiber reinforced plastics (CFRP) under long-term current exposure is a critical issue in aircraft design. In this study, electro-thermal effect decoupling was realized through temperature field monitoring. Woven CFRP laminates were subjected to continuous direct current loading of 0&#xa0;A, 2&#xa0;A, 4&#xa0;A and 6&#xa0;A for 1&#xa0;h, followed by ballistic impact tests using an air gun to acquire strain responses and macroscopic failure modes. The experimental results indicate that the ballistic impact resistance of the laminates gradually deteriorates with the increase of current intensity. Frequency-domain analysis reveals that the spectral energy of strain responses becomes more concentrated as the current rises, reflecting a continuous reduction in the structural energy dissipation capacity against impact. In the time domain, the strain variation slows down, structural oscillation intensifies, and the initial strain duration upon impact extends from 7.9 ms to 19.2 ms. Meanwhile, the failure modes become increasingly severe with the growth of current intensity. Combined with the continuous reduction in specimen resistance during electrification, the evolution of the above macroscopic mechanical responses implies that current loading induces changes in matrix properties, which are strongly correlated with the degradation of interlaminar impact load transfer capacity. This study provides macroscopic experimental references for the structural reliability evaluation of CFRP structures in electric physical fields.</p>

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The Damage Mechanism of Ballistic Impact Performance of CFRP Braided Laminates Under Continuous Direct Current with Varied Current Intensities

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Di Gai,
  • Ximing Yang,
  • Zhipeng Yao,
  • Tongsu Wang,
  • Lin Huo,
  • Jianwei Zhang

摘要

The structural impact resistance reliability of carbon fiber reinforced plastics (CFRP) under long-term current exposure is a critical issue in aircraft design. In this study, electro-thermal effect decoupling was realized through temperature field monitoring. Woven CFRP laminates were subjected to continuous direct current loading of 0 A, 2 A, 4 A and 6 A for 1 h, followed by ballistic impact tests using an air gun to acquire strain responses and macroscopic failure modes. The experimental results indicate that the ballistic impact resistance of the laminates gradually deteriorates with the increase of current intensity. Frequency-domain analysis reveals that the spectral energy of strain responses becomes more concentrated as the current rises, reflecting a continuous reduction in the structural energy dissipation capacity against impact. In the time domain, the strain variation slows down, structural oscillation intensifies, and the initial strain duration upon impact extends from 7.9 ms to 19.2 ms. Meanwhile, the failure modes become increasingly severe with the growth of current intensity. Combined with the continuous reduction in specimen resistance during electrification, the evolution of the above macroscopic mechanical responses implies that current loading induces changes in matrix properties, which are strongly correlated with the degradation of interlaminar impact load transfer capacity. This study provides macroscopic experimental references for the structural reliability evaluation of CFRP structures in electric physical fields.