アルミナ粒子分散エポキシ樹脂の切欠きからの破壊と疲労

概要

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In order to clarify the notch effects on the fracture strength and fatigue strength of alumina particulate -filled epoxide composite, four-point bend tests were conducted on the notched specimens with various root radii. The fractographic features were correlated to fracture mechanics parameters. The results obtained are summarized as follows; (1) Under monotonic or repeated loading, a crack initiated at the notch root by debonding the epoxy-alumina particles. (2) An approximate method for predicting the fracture stress of notched parts under monotonic loading from K_<Ic> and tensile strength of smooth specimens was presented. (3) The crack initiation stage was the major part of fatigue life. The crack propagation stage was negligibly short. (4) The K_<Ic> criterion holds for the onset of unstable fracture not only under monotonic loading but also under fatigue with non-zero stress ratio.
社団法人日本材料学会の論文
1984-10-15