砂岩の疲労試験

概要

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A crank-lever type fatigue testing machine has been designed for the study of fatigue property of rocks. By means of this testing machine, the pulsating compression test has been undertaken for three kinds of rocks : the "Iwaki" sandstone, the "Kimachi" sandstone, and the "Tako" sandstone. From the test, the following results have been obtained. (1) When the S-N curve of the rock begins to be independent of the number of cycles to failure, the number of cycles to failure at that time lies in the order of 10^4 and 10^5. This order is much less than the order in the case of steel, which is between 10^6 and 10^7. (2) The width of stress-strain hysteresis loop of the rock under the pulsating compression has a tende ncy to narrow as the number of cycles increases, and when the rock approaches to failure, the width of hysteresis loop widens again. (3) Young's modulus of the rock has a tendency to decrease as the number of cycle increases.
社団法人日本材料学会の論文
1968-10-15