Self-healing composites using microvascular channel networks have been intensively studied. Microvascular networks in composite in-plane directions are normally utilized to deliver healing agents to damaged areas. However, this channel configuration is not optimal to form robust networks and to infuse large damaged areas. This study proposes a self-healing system using multiple short microvascular channels in the through-thickness direction. First, the advantage of using this channel configuration was confirmed through delamination filling tests. Next, the feasibility of this channel configuration was evaluated by tensile tests and four-point bending tests. Double cantilever beam tests were then conducted to confirm its healing function. Finally, this system was applied to composite stiffened panels and the healing performance was evaluated using compression testing following panel indentation. The healing system almost fully recovered the original strength, confirming its high potential under practical conditions. Additionally, the weight reduction potential of the self-healing system was discussed through a strength comparison of specimens with different thicknesses.

中文翻译：

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使用多个全厚度微血管通道的自修复复合材料结构

已经深入研究了使用微血管通道网络的自修复复合材料。复合平面方向上的微血管网络通常用于将愈合剂输送到受损区域。然而，这种通道配置对于形成强大的网络和注入大面积的损坏区域来说并不是最佳的。本研究提出了一种在厚度方向上使用多个短微血管通道的自愈系统。首先，通过分层填充测试证实了使用这种通道配置的优势。接下来，通过拉伸试验和四点弯曲试验评估了这种通道配置的可行性。然后进行双悬臂梁测试以确认其愈合功能。最后，该系统应用于复合加筋板，并在板压痕后使用压缩测试评估愈合性能。愈合系统几乎完全恢复了原始强度，证实了其在实际条件下的巨大潜力。此外，通过对不同厚度试样的强度比较，讨论了自愈系统的减重潜力。