Autonomous stimulus triggered self-healing in smart structural composites
Autonomous stimulus triggered self-healing in smart structural composites
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DOI：
10.1088/0964-1726/21/9/094027
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发表时间：
2012-09
影响因子：
4.1
通讯作者：
C. Norris;J. A. White;G. McCombe;P. Chatterjee;I. Bond;R. Trask
中科院分区：
文献类型：
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作者：
C. Norris;J. A. White;G. McCombe;P. Chatterjee;I. Bond;R. Trask
受生物系统感知和自主修复损伤能力的启发，这项研究成功地展示了结构复合材料中的第一个自主、刺激触发的自我修复系统。传感和愈合机制都依赖于层压复合材料内的微血管通道。对于触发机制，对单个充满空气的容器进行加压、密封和监测。在落锤冲击（10 J）时，加压容器和那些对环境开放的容器之间的分层和微裂纹连通性导致压力损失，使用合适的传感器，触发泵将愈合剂输送到损伤区。使用这种自主愈合方法，实现了冲击后压缩强度的几乎完全恢复（平均94%）。一个简化的替代系统，愈合剂连续流过血管，类似于血液流动，被发现提供100%的恢复材料的原始强度。光学显微镜和超声波C扫描提供了进一步的证据，大规模输液的基质损伤与愈合剂。这种生物启发技术的成功实施可以大大提高航空航天结构的完整性和可靠性，同时通过提高性能/重量比和延长使用寿命来提供好处。
Inspired by the ability of biological systems to sense and autonomously heal damage, this research has successfully demonstrated the first autonomous, stimulus triggered, self-healing system in a structural composite material. Both the sensing and healing mechanisms are reliant on microvascular channels incorporated within a laminated composite material. For the triggering mechanism, a single air filled vessel was pressurized, sealed and monitored. Upon drop weight impact (10 J), delamination and microcrack connectivity between the pressurized vessel and those open to ambient led to a pressure loss which, with the use of a suitable sensor, triggered a pump to deliver a healing agent to the damage zone. Using this autonomous healing approach, near full recovery of post-impact compression strength was achieved (94% on average). A simplified alternative system with healing agent continuously flowing through the vessels, akin to blood flow, was found to offer 100% recovery of the material’s virgin strength. Optical microscopy and ultrasonic C-scanning provided further evidence of large-scale infusion of matrix damage with the healing agent. The successful implementation of this bioinspired technology could substantially enhance the integrity and reliability of aerospace structures, whilst offering benefits through improved performance/weight ratios and extended lifetimes.