Crack healing is achieved by the dissolution and redistribution of thermoplastic-rich regions into the damage volume. The transverse cracks rupture the microcapsules and release of the encapsulated solvent into the crack plane. Composite specimens are fabricated with a stacking sequence from self-healing prepreg tapes and loaded in transverse tension until crack saturation is achieved. This dual functionality is achieved via the microencapsulation of a solvent-based healing agent doped with aggregation induced emission (AIE) luminogens and the subsequent dispersion of such microcapsules in carbon prepreg containing a thermoplastic-toughened epoxy matrix. In this work, we introduce a microcapsule-based self-reporting and self-healing strategy for simultaneous detection and repair of cracks in FRPs. N2 - The performance of fiber-reinforced polymer (FRP) composites is limited by susceptibility to transverse microcracking and interfacial debonding. © 2021, The Society for Experimental Mechanics, Inc. Sang Yup Kim for helpful suggestions, undergraduate researchers Alexander Kosyakov, Enola Ma, and Aiden Kamber for microcapsule synthesis and characterization, and use of the Imaging Technology group and shared user facilities at the University of Illinois Beckman Institute. T1 - Autonomous Healing and Indication of Transverse Crack Damage in Carbon Fiber Composite LaminatesĪcknowledgements This work was supported as part of the AFOSR Center of Excellence in Self-Healing, Regeneration and Remodeling, award FA-0017. The healing efficiency of the composite specimens is assessed by comparing the applied stress levels and strain fields associated with cracking events pre- and post-healing.", The self-reporting functionality is evaluated by correlating the presence of microcracks with regions of damage-induced fluorescence. Using a small load frame that mounts under an optical microscope, we measure full-field surface strains during loading of the composite specimens via digital image correlation (DIC). Evaporation of the solvent leaves solid thermoplastic in place of the crack and allowing AIE luminogens to aggregate and fluoresce. The healing efficiency of the composite specimens is assessed by comparing the applied stress levels and strain fields associated with cracking events pre- and post-healing.Ībstract = "The performance of fiber-reinforced polymer (FRP) composites is limited by susceptibility to transverse microcracking and interfacial debonding. The performance of fiber-reinforced polymer (FRP) composites is limited by susceptibility to transverse microcracking and interfacial debonding.
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