Abstract
This study focused on the effect of patch bonding on mechanical property 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 plain woven CF was stacked and pressed under 240℃, 2.5 MPa for 3 min to fabricate the prepreg. The prepreg was 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 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 compression side to the tension side. The effect of patch bonding on bending strength and modulus was 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 calculated model. Calculated result suggested that the effect of patch bonding on bonding modulus was simply estimated by laminated beam theory.
