き裂を有するぜい性材料の静疲労試験結果の解析法 : ソーダライムガラスによる実験的検証

概要

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The present paper aims to verify experimentally the author's previous analytical method on the static fatigue data of brittle materials with an initial crack. The experimental results obtained on a soda-lime glass showed very good agreement with the analysis as follows : (1) the newly defined "normalized time to failure", (〓_〓)_N=T_〓/(W/a^^・^*)/〓^1_<x_0>{[x_0F(x_0)]/[xF(x)]}^ndx, is very useful to analyze the experimental data ; the initial stress-intensity K_<1i>-values for two kinds of specimens (single edge cracked 3 point bending and tensile specimens) with different crack length are well expressed by a unique function of the (〓_〓)_N(T_〓;the time to failure, W;the specimen width, x_0;non-dimensional initial crack length, F;the specimen's geometry factor and n;a constant), (2) a sharp gap in K_1 at the Region II on ∈^^・ -K_1 diagram still appears in the K_<1i>-T_〓 relation (or σ_a-T_〓 relation, σ_a;the applied stress) though it becomes a little gentle, and (3) the existence of the lowest value of K_1 (the threshold) is experimentally clarified and the Region 0 was found.
社団法人日本材料学会の論文
1994-11-15