CF強化ナイロン46の低速度疲労き裂進展特性に及ぼす強化繊維のブリッジング効果

概要

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The influences of carbon fiber (CF) on fatigue crack propagation (FCP) of advanced Nylon 46 (N46) were studied in comparison with glass fiber (gf)-reinforced N46. FCP properties were estimated vertical to the injection direction of the molding plate. Three kinds of specimens were tested : 30 wt %gf-, 15 wt %CF- and 30 wt %CF-reinforced N46 (described as gf30, CF15 and CF30, respectively). The values ofΔK at da/dN=10^<-9> m/cycle, ΔK(10^<-9>), were 2.8, 2.8 and 3.2 MPa √<m>, respectively. From fractography using SEM, it was shown that the effect of reinforced fibers on FCP was manifested as fiber bridging. Furthermore, from thermographic nondestructive testing using infrared thermography, it was found that the variation in FCP of each specimen was related to the crack tip opening displacement.
一般社団法人日本機械学会の論文
1995-10-25