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

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

doi:10.5539/jmsr.v2n3p60

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…1,5 Among the CFRP, carbon-fiber-reinforced thermoplastics (CFRTP) are expected to have better mass productivity and recyclability than the conventionally used thermosetting CFRP. 4,6,7 Many studies on the improvement of mass productivity of CFRTP have been reported, 8 but their recyclability remains to be considered, although thermoplastic polymer can be re-melted and reshaped. As a method to mold CFRTP, carbon fiber thermoplastic prepreg sheets heated and pressed after having been cut into a desired shape and stacked.…”

Section: Introductionmentioning

confidence: 99%

Recycling of carbon-fiber-reinforced polypropylene prepreg waste based on pelletization process

Tomioka¹,

Ishikawa²,

Okuyama

et al. 2017

Journal of Composite Materials

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This research proposes a technique to recycle carbon-fiber-reinforced polypropylene thermoplastics based on a pelletization process followed by injection molding. Experiments were designed with different process conditions to evaluate the efficient performance of the recyclates. In this study, the properties of the recyclates with various fiber contents were compared with those of conventional virgin products. The study confirmed that the recycled composite is as usable for injection molding as virgin conventional materials in terms of flowability and mechanical properties. The recycled composite is suggested to have better interfacial adhesion between the fiber and the resin than conventional materials because of the good impregnation of the carbon fibers in the carbon-fiber-reinforced-thermoplastic waste. In conclusion, the recycling of carbon-fiber-reinforced-thermoplastic prepreg waste using the proposed method is simple, effective and it would be economical.

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Section: Introductionmentioning

confidence: 99%

Recycling of carbon-fiber-reinforced polypropylene prepreg waste based on pelletization process

Tomioka¹,

Ishikawa²,

Okuyama

et al. 2017

Journal of Composite Materials

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“…In the case of long-fiber composites, owing to their anisotropic mechanical characteristics, interlaminar failure often occurs between the layers in the first or second stage of fracturing (Nishikawa, et al, 2006). Such failure is also seen in the case of CFRTPs (Obunai, et al, 2013), while CFRTPs have higher fracture toughness than Carbon-fiber-reinforced-thermosets (CFRTS). In the case of CFRTS, a number of methods for increasing the interlaminar toughness, such as the modification of the matrix (Kim, et al, 1992), stitching of reinforcements (Liu, 1991), and Z-pining (Dai, et al, 2004), have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Effect of hot needle punching on bending and inter-laminar characteristics of CF/PA6 composite

Obunai

Fukuta

Ozaki

et al. 2016

Mechanical Engineering Journal

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The purpose of this study is to investigate how affect the hot needle punching on bending strength and inter-laminar fracture toughness of CFRTP. Four types of needle in which tip shape were different was used to investigate the effect of needle shape on bending strength and interlaminar fracture toughness of CFRTP. CFRTP specimen was heated to soften the matrix of PA6, and then needle punching was conducted to specific number of times per unit area. The bending characteristics and interlaminar fracture toughness of CFRTP were evaluated by four point bending test and double cantilever beam (DCB) test, respectively. Test results showed that when punching was done using a needle with a notch at the tip, it resulted in the realignment of the yarn fibers along the out-plane direction of the punched specimen. It also led to the breakage of the fibers, owing to excessive bending. Moreover, due to the high viscosity of the matrix resin, the void was generated when the needle was pulled out from the composite. The interlaminar fracture toughness of the CFRTP specimens improved when punching was performed at stab density of 12 cm −2 or more. Finally this paper revealed that the mode I fracture toughness of the needle-punched CFRTP specimens is dependent on both of crack bridging of the realigned fiber and pin-like resin structure. Effect of hot needle punching on bending and inter-laminar characteristics of CF/PA6 composite

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Experimental Evaluation of Delamination Repair and Compressive Strength of CF/PAEK via Thermal Fusion Aimed at Application to Actual Structures

KANESAKI,

FUKUTA,

OZAKI

et al. 2024

Journal of the Japan Society for Composite Materials

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

Cited by 3 publications

References 4 publications

Recycling of carbon-fiber-reinforced polypropylene prepreg waste based on pelletization process

Recycling of carbon-fiber-reinforced polypropylene prepreg waste based on pelletization process

Effect of hot needle punching on bending and inter-laminar characteristics of CF/PA6 composite

Experimental Evaluation of Delamination Repair and Compressive Strength of CF/PAEK via Thermal Fusion Aimed at Application to Actual Structures

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