OS0503 き裂の応力拡大係数解析用ひずみゲージの開発 : 第1報 開口モード応力拡大係数の解析式と精度検証実験 OS0503 Development of Strain Gages to Analyze the Stress Intensity Factor of a Crack Tip : 1st Report: Formulations for Opening Mode Stress Intensity Factor and Verification with Experiments

Strain gages to measure only the stress intensity factor are only one or two kinds so far. They are not easy nor practical to analyze the stress intensity factor. Therefore, this paper reports on the development of strain gages dedicated to analyze the stress intensity factor easily and practically. The authors have made the strain gages for trial purpose. The strain gage was pasted to the crack tip of the plate tension specimens, having the opening mode crack. The authors carried out the tensile tests of the test pieces that pasted such strain gauges. As results, the experimental values of the opening mode stress intensity factors to be able to count by calculator were obtained within ±10% compared with analytical values.