一方向連続繊維強化複合材料中の面内せん断形き裂のき裂進展抵抗に及ぼす繊維橋渡し効果

概要

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The fiber bridging effect, which affects the crack extension resistance in fibrous composites, is discussed in the case of in-plane shear mode crack extensions parallel to fibers in unidirectional fiber-reinforced composites. We first consider the formation process of a bridging fiber and then make a model of this single fiber bridging to characterize precisely the behavior of a bridging fiber under the relative displacement between upper and lower crack surfaces. By using this model, the force acting on crack surfaces through a bridging fiber is estimated. Then, introducing stochastic process of fiber breakage, we obtain the quantitative relationship between the relative crack surface displacement and the equivalent cohesive stress which is the probabilistic expectation of forces acting on crack surfaces due to a large number of bridging fibers. We numerically simulate the crack extension behavior with the cohesive stress acting on crack surfaces, and find that the simulated result is in agreement with the experimental results of a unidirectional glass fiber-reinforced epoxy composite. We finally conclude that the in-plane shear mode crack extension is greatly affected by the stochastic process of fiber breakage.
一般社団法人日本機械学会の論文
1989-05-25