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• W3119393607 abstract "Laminated composites are highly susceptible to delamination, and delamination due to fatigue loading is one of the most critical damage modes in composite structures that may lead to a catastrophic failure. Hence, it is paramount to investigate and quantify the delamination crack growth behavior due to fatigue loading and explore methods to heal the delamination. Therefore, double cantilever beam (DCB) specimens of a carbon fiber-reinforced polymer (CFRP) composite containing thermoplastic healants were manufactured, and the Mode-I fatigue delamination experiments were carried out for virgin and five healing cycles. The main objective of using thermoplastic healants- polycaprolactone (PCL) and shape memory polymer (SMP) was to heal the cracks formed during fatigue loading as well as to regain its load-carrying capacity. The healing was initially achieved with the help of an oven where the heating was provided to close the cracks using thermoplastic healants, but later in-situ healing was achieved by activating macro fiber composite (MFC) attached to the DCB specimen. For virgin and healed specimens’ experimental data, the Paris law parameters were extracted, and the results obtained from different specimens were found to be similar upon the comparison. Furthermore, the slope parameter of the Paris law for the healed specimens was found to be almost 75% ~ 86% of the virgin specimen, thereby suggesting the excellent healing performance of the specimens under fatigue loading. In this study, the in-situ healing performance of Mode-I interlaminar fracture of CFRP composites subjected to fatigue loading for up to seven healing cycles was investigated. The in-situ healing was performed by activating macro fiber composite (MFC) attached to the DCB specimen after 5000 cycles of loading. For the fifth, sixth, and seventh in-situ healing cycles, there was 10% ~ 12% reduction in crack growth after 21,000 cycles with respect to the virgin cycle. The substantial increase in maximum Mode-I strain energy release rate (Gmax) observed after in-situ healing was likely due to the increase in stiffness of the DCB specimen material along the healed zone. More work is needed to investigate the exact mechanism. We envision that these findings will be immensely helpful in extending the service life of composites via ins-situ healing and may also result in significant repair cost savings." @default.
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• W3119393607 date "2021-01-04" @default.
• W3119393607 modified "2023-10-16" @default.
• W3119393607 title "In-situ Healing of Mode-I Fatigue Crack in Fiber Reinforced Composites" @default.
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• W3119393607 doi "https://doi.org/10.2514/6.2021-0403" @default.
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