Microcracking and Compressive Strength Degradation of Carbon Fiber/Polyimide Resin Composites by Thermal Cycling

Katoh, Hisaya; Shimokawa, Tomotsugu; Hamaguchi, Yukihisa; Mizuno, Hiroshi; Nakamura, Hiroyuki; Asagumo, Ryoji

doi:10.2472/jsms.53.1109

Cited by 1 publication

(2 citation statements)

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“…Carbon Fiber Reinforced Plastic (CFRP), which has a high level of specific stiffness and strength, is focused on as a structural material for reusable launch vehicles, which will be used under water and in thermal cycling environments. Therefore, the effects of water absorption [1][2][3][4][5][6][7] and thermal cycling [8][9][10] on the mechanical properties of CFRP have been studied.…”

Section: Introductionmentioning

confidence: 99%

“…The flexural property and Mode I interlaminar fracture toughness of CFRP after water absorption and freezing decreased with an increase in immersion time. Katoh et al [8] reported on the compressive strength of CFRP during thermal cycling, which decreased with an increase in the number of cycles because of the initiation of cracks in CFRP during thermal cycling. The mechanical properties of water absorbed CFRP during thermal cycling should be investigated in respect of its application as a structural material in reusable launch vehicles.…”

Section: Introductionmentioning

confidence: 99%

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Residual flexural property of water absorbed CFRP during thermal cycling

Katogi¹,

Takemura²,

Iijima³

2016

WIT Transactions on the Built Environment

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This study investigated the effect of water absorption on the residual flexural property of CFRP during thermal cycling. Water absorption tests of CFRP and epoxy resin were conducted for 3 hours and 100 hours at 90°C. Thermal cycling tests of water absorbed CFRP and epoxy resin were also conducted. The temperature of the thermal cycling test ranged from-196ºC to room temperature, and the maximum number of cycles was 10 3 cycles. A static three-point flexural test of water absorbed CFRP was conducted after the thermal cycling test. A damage observation of CFRP during thermal cycling was performed. A singleedge notched bending test of water absorbed epoxy resin was also conducted. As a result, the following conclusions were obtained. In the case where the water absorption rate was 0.3% (3 hours), the flexural strength and modulus of CFRP decreased with an increase in the number of cycles. In the case where the water absorption rate was 1.1% (100 hours), there was almost no change in the flexural strength and modulus of CFRP. From the damage observation, crack initiations in the cross section of 0.3% and 1.1% water absorbed CFRP were found during thermal cycling. The number of cracks in the cross section of 0.3% and 1.1% water absorbed CFRP increased with an increase in the number of cycles. The Mode I fracture toughness of 2.6% (100 hours) water absorbed epoxy resin increased compared with that of 0.7% (3 hours) water absorbed epoxy resin during thermal cycling. Therefore, the flexural property of CFRP was affected by the Mode I fracture toughness of water absorbed epoxy resin.

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