超小形ひずみゲージによるモードI応力拡大係数の実験解析法

概要

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This paper describes a method of measurement for the Mode I stress intensity factor (S.I.F), which uses extremely small-sized strain gages consisting of 5 measuring grids. The strain gages used in this study are extremely small consisting of 5 grids with a gage length of 0.15 mm and pitch of 0.5 mm. This paper proposes two kinds of methods of stress intensity factor alalysis. One of them uses only one datum of the nearest gage at the crack tip ("1-point gage method"), and the other uses 5 gage datums which are used in the extrapolation ("5-point gage method"). The experiments are carried out using center-cracked test specimens (CCT) and single-edge-cracked plate tension specimens (SECT). For the SECT specimen, the accuracy of the S.I.F mode I determined by the experiments is within ±13 percent for the "5-point gage methed" and "1-point gage method", compared to the analytical value.
1993-09-25