Effect of Water Absorption on Flexural Strength and Creep Property of Carbon Fiber Reinforced Composite

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  • 炭素繊維強化複合材料の曲げ強度及びクリープ特性に及ぼす吸水の影響
  • タンソ センイ キョウカ フクゴウ ザイリョウ ノ マゲ キョウド オヨビ クリープ トクセイ ニ オヨボス キュウスイ ノ エイキョウ

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In this study, effects of water absorption on flexural strength and creep property of carbon fiber reinforced composite (CFRP) as well as epoxy resin were examined. Weight gains were measured after immersion in distilled water at room temperature, 50°C, 70°C and 90°C. Static flexural tests were conducted after immersion for 30 and 60 days. The flexural creep test of CFRP was carried out in the temperature range from 50°C to 80°C. As a result, weight gain increased with an increase of water temperature for the both CFRP and epoxy. Weight gain after 30 days at 90°C was not saturated, that was caused by the crack initiation in the matrix. The flexural strength of CFRP was decreased with an increase of water temperature of immersion, because of increasing number of cracks in matrix and debondings at the interface between fiber and matrix. The dimension of thickness also increased. The time to creep fracture was dependent on the temperature of environmental water. The steady state creep rate was much increased for CFRP immersed in a water over 70°C.

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