In this study, macro fiber composite (MFC) assisted in-situ healing of unidirectional fiber reinforced polymer (FRP) composite was investigated and characterized by double cantilever beam (DCB) tests. Biomimetic healing of delamination damage in carbon fiber reinforced composite (CFRP) was achieved by using a blend of biphasic healant: polycaprolactone (PCL) and polyurethane shape memory polymer (SMP). When the damage initiated at the fiber matrix interface or through the matrix, the thermoplastic SMP/PCL blend closed the crack due to localized stimulus (heat) provided by MFC. Crack closure was followed by healing via PCL healant using the same stimulus. Protocol for characterizing the healing efficiency of CFRP composite was established. The experimental results demonstrated that the localized healing method not only enables the in situ healing but also outperforms conventional healing methods in terms of healing efficiency. The MFC actuated healing yielded up to ∼160% recovery of virgin interlaminar fracture property and ∼70% flexure property recovery for seven healing cycles. This novel healing system can thus provide efficient in-situ healing in aerospace structures using MFC sensors as self-healing actuators, and bridge the gap between the laboratory scale and large-scale industrial application of self-healing polymer composite.

在这项研究中，宏观纤维复合材料（MFC）辅助原位愈合的单向纤维增强聚合物（FRP）复合材料，并通过双悬臂梁（DCB）测试进行了表征。碳纤维增强复合材料（CFRP）中脱层损伤的仿生修复通过使用双相修复剂：聚己内酯（PCL）和聚氨酯形状记忆聚合物（SMP）的混合物来实现。当在纤维基质界面处或通过基质引发破坏时，由于MFC提供的局部刺激（热量），热塑性SMP / PCL共混物关闭了裂缝。裂纹闭合后，使用相同的刺激通过PCL愈合剂进行愈合。建立了表征CFRP复合材料愈合效率的方案。实验结果表明，局部愈合方法不仅可以实现原位愈合，而且在愈合效率方面也优于传统的愈合方法。MFC驱动的愈合在七个愈合周期中可恢复约160％的原始层间断裂特性，并恢复约70％的挠曲特性。因此，这种新颖的修复系统可以使用MFC传感器作为自修复驱动器在航空航天结构中提供有效的原位修复，并弥合实验室规模与自修复聚合物复合材料在大规模工业应用之间的差距。