JIS R 1607三点曲げ破壊靭性試験片のコンプライアンスと応力拡大係数の解析

概要

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To use for single specimen determination of R-curve with three-point bending of JIS R 1607 type II specimen (span-to-width ratio, S/W=7.5), calculation formulas for analyses with the elastic compliance method are presented. Numerical analyses of stress intensity factor and specimen compliance are carried out and based on these results, crack length and stress intensity factor are expressed as functions of specimen compliance. These are defined in the entire range of crack length relative to specimen width, a/W. A formula of a/W as a function of specimen compliance, inverse compliance, is also derived. In this procedure, two different techniques, boundary collocation and finite element method, are performed independently. The results of the both calculation show good agreement in the most range of a/W and the uncertainty is estimated to be within 0.8%. The reliability of proposed formulas is also examined in experiments. Crack length and stress intensity factor of borosilicated glass samples are calculated with proposed formulas and verified with other experimental facts. As a result of these experiments the reliability of calculated values is estimated to be within 3%.
公益社団法人精密工学会の論文
2002-06-05