先進強化ナイロン46の疲労信頼性に関する基礎的研究 : 第1報,平衡吸湿状態下・射出方向への低速度疲労き裂進展に及ぼす充てん物の影響

概要

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The influences of fillers on fatigue crack propagation (FCP) of advanced Nylon 46 were studied. In particular, with a focus on the fatigue reliability of filler-reinforced Nylon 46 in practical usage, FCP was estimated in parallel with the injection direction of the specimen controlled for the equilibrium moisture content under 23℃ and 50% R. H. The three kinds of tested materials Were short E-glass fiber-, Miker mineral- and EPM rubber-reinforced Nylon 46, which are reterred to as G, M and R material respectively. The threshold of FCP, ΔK_th for G, M and R material was 1.4, 1.2 and 1. 0 MPa√<m> respectively. So, the resistance of G material against FCP was found to be superior in all materials. Fractography using SEM showed that the fatigue crack near threshold in G material propagated through the matrix in a zigzag line. Therefore, it could be interpreted that the variation in the property of FCP of each tested material was caused by the difference in the roughness of the fracture surface.
一般社団法人日本機械学会の論文
1992-08-25