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This study focused on the effect of patch bonding to mechanical properties of damaged Carbon Fiber Reinforced Thermo Plastics ( CFRTP ). In this study, CFRTP in which matrix was made of PA6 was fabricated to investigate the bending properties. The 0.1mm thick of PA6 sheet and a plain woven CF were stacked and pressed under 240 °C, 3 MPa with 3 min to fabricate the prepreg. The prepregs were stacked with quasi-isotropic laminate configuration of [0-90/±45]5s. The fabricated CFRTP was cut into 70×10×2.5 mm of strip specimen. The damage morphology of CFRTP was studied under four-point bending load. The observation of side view of specimen during the bending test suggested that the local delamination was appeared when the 2.0% of bending strain was applied. According to the increment of bending strain, the damage was initiated from compressive side to tensile side. The effect of patch bonding on bending strength and modulus were evaluated. Test result showed that the damaged specimen would be repaired when appropriate layer of patch was bonded. The bending modulus of repaired specimen was predicted by the calculated model. Calculated result suggested that the effect of patch bonding on bonding modulus was simply estimated by laminated beam theory.

Fundamental Research of Repair for Bending Damaged Carbon Fiber Reinforced Thermoplastics under Bending Load