破壊じん性値がき裂速度依存性を有するセラミックスの破壊じん性値の初期き裂長さおよび試験片形状依存性

概要

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It has been pointed out by the authors that in conventional fracture toughness K_I tests of crack-rate sensitive, perfectly brittle materials, a crack begins to extend before a maximum load(fracture load, P_<max>)appears in a load-deflection curve. The amount of the extension depends upon the compliance of the testing machine, initial crack length x_0 and specimen geometry. Therefore, the obtained K_I-values(an apparent K_I;K_<Ii>)are always underestimated as far as the values are evaluated by using P_<max> and x_0. The present paper aims to show how the K_<Ii>-value depends on x_0 and specimen geometry. Both numerical simulation and experimental data on a glass and an alumina ceramic show that the K_<Ii>-value increases with x_0 and also the value depends upon specimen geometry(3 point bending, CT and single edge cracked tensile specimens).
社団法人日本材料学会の論文
1995-04-15