On the cyclic delamination-healing capacity of vitrimer-based composite laminates

This study aims to investigate the self-healing capability of a composite laminate composed of novel bio-based benzoxazine vitrimers when subjected to delamination-healing cycles. The composite laminate is manufactured using compression resin transfer moulding. To quantify the interlaminar shear strength (ILSS) and induced damage, three-point bending tests were conducted on short-beam shear specimens. The healing of interfacial damages was achieved by applying pressure (1 MPa) at 170 degrees C. Three healing experiments were performed with different thermal cycling durations: 1, 10, and 60 min. The extent of interfacial healing was evaluated through four repetitions of delamination-healing cycles. Despite a gradual decrease in ILSS values with each cycle, the specimens subjected to a 60-minute healing process exhibit remarkable recovery. After three cycles, 80 % of the ILSS is restored, highlighting the highly efficient healing capability of the vitrimer-based composite.

Automated summary

This study investigates the self-healing capability of a novel bio-based benzoxazine vitrimer composite laminate. The laminate is manufactured using compression resin transfer moulding, and three-point bending tests are conducted to assess interlaminar shear strength (ILSS) and induced damage. Interfacial damages are healed through pressure and temperature. The results show that the composite has highly efficient healing capability, with 80% of the ILSS restored after a 60-minute healing process.