In this study, compression-after-impact (CAI) test, compression test after repairing impact damage by thermal fusion bonding (CAR_TFB), compression tests with specimen removed the residual stress (CAR_A) and out-of-plane deformation (CAR_D) caused by the dent below melting point, were carried out in order to evaluate the efficiency of repair of carbon fiber reinforced thermoplastic (CFRTP) laminates with barely visible impact damage (BVID) and to experimentally confirm the existence of a threshold of the damage length. Cross-ply laminates used for specimens was made of carbon fiber/polyamide 6 unidirectional semi-prepreg which have 0.043 mm in thickness and 54% in fiber volume fraction. Not only strength of CAR_TFB, but also that of CAR_A and CAR_D were recovered to the same level of compressive strength of intact specimen, although internal impact damages in CAR_A and CAR_D specimens were not bonded by thermal fusion. The results show that residual stress and/or out-of-plane deformation were govern the residual compressive strength of the laminates with BVID. Thus, not only thermal fusion bonding but also repairing only dent below melting point are expected as one of the promising repair method to recover the compressive strength of the CFRTP laminates with BVID.
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