Abstract
In this article, laminated composite with the ability to heal low velocity impact induced delamination designed, fabricated, and tested. The self-healable and recyclable composite is made of a self-healable and recyclable vitrimer-based shape memory polymer (VSMP) as the matrix, unidirectional Saertex glass fiber as the reinforcement, and tension programmed shape memory alloy (SMA) wires (Flexinol) as z-pins. This design followed the strategy of close-then-heal (CTH) for delamination healing. Low velocity impact tests, compression after impact tests, and self-healing of impact induced delamination were investigated. The tension programmed SMA z-pins helped resist delamination during impact; the shape memory effect of the vitrimer and SMA z-pins, together with the external pressure used, helped narrow/close the delamination through constrained shape recovery during heating. The narrowed/closed delamination can be healed repeatedly by the VSMP itself. The novel hybrid composite laminate is a promising composite for sustainable structural applications.
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