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<p>This study investigates the damage process and residual compressive strength of three-dimensional four-directional braided carbon fiber composites under simultaneous impact conditions. By designing different braiding angles between the two impact positions, impact point spacings, and impact methods, impact experiments were conducted on specimens with 15° and 30° braiding angles using an impact energy of 30&#xa0;J, along with ultrasonic C-scan for damage detection. Experimental results show that when the impact point spacing is small, the simultaneous impact effect is significant, leading to a larger damage area and lower residual strength. In contrast, when the impact point spacing is large, the damage area decreases, and the residual strength increases. Different braiding angle significantly influence the damage propagation of the specimens. The specimens with a 15° braided angle exhibit damage primarily along the longitudinal direction, whereas the specimens with a 30° braiding angle show more uniform damage. The impact method has a minimal effect on the remaining strength of the 15° specimens, indicating their superior strength performance, whereas the 30° specimens exhibit a more pronounced nonlinear failure mode. This study provides a theoretical basis for optimizing the performance of composite materials under complex impact environments.</p>

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Analysis of the Residual Compressive Strength of Three-Dimensional Four-Directional Braided Carbon fiber Composites Under Simultaneous Impact Conditions

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Yongxin Niu,
  • Shi Yan,
  • Zixiang Meng,
  • Songming Cai

摘要

This study investigates the damage process and residual compressive strength of three-dimensional four-directional braided carbon fiber composites under simultaneous impact conditions. By designing different braiding angles between the two impact positions, impact point spacings, and impact methods, impact experiments were conducted on specimens with 15° and 30° braiding angles using an impact energy of 30 J, along with ultrasonic C-scan for damage detection. Experimental results show that when the impact point spacing is small, the simultaneous impact effect is significant, leading to a larger damage area and lower residual strength. In contrast, when the impact point spacing is large, the damage area decreases, and the residual strength increases. Different braiding angle significantly influence the damage propagation of the specimens. The specimens with a 15° braided angle exhibit damage primarily along the longitudinal direction, whereas the specimens with a 30° braiding angle show more uniform damage. The impact method has a minimal effect on the remaining strength of the 15° specimens, indicating their superior strength performance, whereas the 30° specimens exhibit a more pronounced nonlinear failure mode. This study provides a theoretical basis for optimizing the performance of composite materials under complex impact environments.