Study on Patch Bonding for Recovery of Damaged Carbon Fiber Reinforced Thermoplastics Subjected to Four-Point Bending Load

Kiyotaka Obunai, Tadao Fukuta, Koichi Ozaki, Rei Yamagishi, Masahiro Yamamoto


The purpose of this study is to investigate the fracture behavior and repairability of carbon fiber reinforced thermoplastics (CFRTP). At first, four-point bending tests were conducted to characterize the bending characteristics of fabricated CFRTP. The test results show that local delamination first appeared when the applied bending strain was 2.0%. When the bending strain reached 2.5%, the failure of the fiber due to local buckling was observed at the compression side of the specimen. Secondly, the effect of patch bonding on the bending strength and flexural modulus was also evaluated. Test results showed that damaged specimen could be repaired by bonding of an appropriate patch layer. Patch bonding at the compression side was more effective than at the tension side. The flexural modulus of a repaired specimen was estimated by the laminate beam model.

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Journal of Materials Science Research   ISSN 1927-0585 (Print)   ISSN 1927-0593 (Online)

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