Smart and repeatable easy-repairing and self-sensing composites with enhanced mechanical performance for extended components life
Smart and repeatable easy-repairing and self-sensing composites with enhanced mechanical performance for extended components life
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DOI：
10.1016/j.compositesa.2022.107337
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
T. D. Thorn;Yi Liu;X. Yao;D. Papageorgiou;P. Robinson;E. Bilotti;T. Peijs;Han Zhang
中科院分区：
文献类型：
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作者：
T. D. Thorn;Yi Liu;X. Yao;D. Papageorgiou;P. Robinson;E. Bilotti;T. Peijs;Han Zhang
具有自修复和自感知智能功能的结构复合材料在航空航天、汽车和可再生能源领域受到特别关注。然而，目前大多数自修复方法要么需要相对复杂的修复网络设计，要么在引入修复剂后牺牲碳纤维复合材料系统的初始机械或热性能。在此，一种基于常用热塑性交织材料的极其简单的方法已被证明可以实现可重复的易于修复和自传感功能，同时与未改性的碳纤维/环氧树脂系统相比，其机械性能也得到了提高。此外，由于热塑性塑料的高玻璃化转变温度，可修复的复合材料在高达80°C时具有不变的存储模量，解决了以前热塑性塑料可修复环氧基体系的限制。峰值载荷保留率高（99%），层间断裂韧性恢复良好（34%）。最重要的是，在连续四个损伤和愈合周期后，机械性能仍然比未修改的系统更好。基于压阻法实现了可重复的原位损伤传感。这种基于“旧”方法的“新”发现，与当前的复合材料制造完全兼容，可能会克服机械性能和修复功能之间存在的冲突，为延长部件的使用寿命提供新的解决方案，从而实现复合材料领域的可持续发展。
Structural composites with smart functionalities of self-healing and self-sensing are of particular interest in the fields of aerospace, automotive, and renewable energy. However, most of the current self-healing methodologies either require a relatively complex design of the healing network, or sacrifice the initial mechanical or thermal performance of the carbon fibre composite system after introducing the healing agents. Herein, an extremely simple methodology based on commonly used thermoplastic interleaves has been demonstrated to achieve repeatable easy-repairing and self-sensing functionalities, alongside enhanced mechanical performance in comparison with unmodified carbon fibre/epoxy system. Moreover, due to the high glass transition temperature of the thermoplastic, the repairable composites are shown to have an unchanged storage modulus up to 80 °C, solving the previous limitation of repairable epoxy matrix systems with thermoplastics. High retention of peak load (99%) and a decent recovery of interlaminar fracture toughness (34%) was achieved. Most importantly, the mechanical properties remained greater than the unmodified system after four consecutive cycles of damage and healing. Repeatablein-situdamage sensing was achieved based on the piezoresistive method. This “new” discovery based on an “old” approach, which is fully compatible with current composite manufacturing, may overcome existing conflicts between mechanical performance and healing functions, providing a new solution to extend components’ service life towards a more sustainable development of the composite sector.