炭素繊維強化エポキシ樹脂複合材料(CFRP)の疲労特性に及ぼす水分吸収の影響

概要

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This paper discusses the environmental degradation behavior of carbon-fiber-reinforced plastic (CFRP) laminated material, due to water absorption. In order that the CFRP materials can be used more effectively as structural members with higher safety and reliability for factories, it is considered indispensable to understand in detail the influence of environment factors that accelerate dynamic degradation, such as fatigue. A summary of the results is as follows. Fick's diffusion law is applicable to analysis of water desorption and absorption characteristics of the uni-directional fiber reinforced (UD) and plain woven reinforced (CL) materials. The desorption and absorption processes are diffusion-controlled processes within matrix resins, including the skin layer. The properties of the skin layer significantly influence the fatigue life of the CFRP laminates. Furthermore, the decrease of fatigue strength is caused by the lowering of molecular weight in the regions of resin close to the reinforced fibers in the skin layer, when a small amount of absorbed water and repeated stress coexist.
一般社団法人日本機械学会の論文
1994-03-25