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This paper presents the study of repeatable self-healing capability of thermoplastic healing agent poly-caprolactone (CAPA-6506) and shape memory polymer (SMP) in a fiber reinforced polymer composite structure. This self-healing is inspired by the bio-mimetic process of'close then heal'mechanism where the thermally actuated SMP causes the closing of cracks and the thermoplastic healing agent performs the healing. In this study, two types of sixteen layered unidirectional carbon fiber reinforced thermoset polymer (SC-780) composites were tested:(1) with SMP (containing 6.4 vol% of CAPA and 0.6 vol% of SMP), and (2) without SMP (containing 6.4 vol% of CAPA only). To quantify the healing efficiency in terms of Mode-I interlaminar fracture toughness, double-cantilever beam tests were carried out for seven separate healing cycles by following the ASTM-D5528-13 standard. The tests yielded promising results …