連続繊維強化金属基複合材料の引張強さにおよぼすマトリックスの降伏応力と靱性の影響に関する計算機シミュレーション実験

Abstract

Influences of yield stress and ductility of matrix on tensile strength of unidirectional continuous fiber-reinforced metal matrix composites with high interfacial bonding strength were studied by means of a Monte-Carlo computer simulation method. In the case where the ductility of matrix was high, the strength of composites increased with increasing yield stress of matrix but the efficiency of reinforcement became low at high yield stress. In this case, the strength decreased monotonically with increasing scatter of strength of fiber when the yield stress was low, while it decreased, reaching minimum, and then increased when the yield stress was high. In the case where the ductility of matrix was low, the strength was low especially when the volume fraction of fiber was high and scatter of strength of fiber was large. Depending on the values of yield stress and ductility of matrix, following cases were found; the case where the strength increased linearly with inctreasing volume fraction of fiber and it was approximately described by the rule of mixtures, the case where the strength was approximately described by the rule of mixtures when volume fraction of fiber was low but it became lower than the same rule when the volume fraction was high, and the case where the strength increased linearly with increasing volume fraction of fiber but it was much lower than the rule of mixtures.