<報文>単粒子の疲労破壊

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Fatigue fracture for four kinds of glassy materials and two kinds of minerals were investigated under two environmental conditions of air and water. Specimens were shaped into spheres having the nominal diameters of 0.09 cm for soda glass beads and 2.0 cm for the other kinds of samples. The experiment was made under the repeated compressive stress generated by a universal testing machine and two fatigue testing apparatus utilizing an electro-magnet. The experimental results are summarized as follows : 1) It can be seen from the S-N curves measured for the glassy materials that the fatigue life under dry crushing is longer than that under wet crushing, and its fatigue strengthes are distinguishable from the sphere compressive strengthes determined by the static compressive loading test. 2) The endurance limit of soda glass beads appears near the mean number of cycles N of 10^6,and its value is about 0.2 in the ratio of the repeated compressive stress to the sphere compressive strength. 3) It can be seen from the measurement of frequency of survival till the number of cycles N of 20 for the minerals that the fatigue life under the dry crushing is longer than that under the wet crushing. 4) In the glassy materials, fracture energy, new surface produced and fracture surface energy decrease with the decrease of the repeated compressive stress. On the other hand, in the minerals, fracture energy and fracture surface energy increase with the decrease of the repeated compressive stress, but new surface produced is approximately constant as independent of the repeated compressive stress. 5) In the fatigue fracture test, the influences of water on fracture energy, new surface produced and fracture surface energy are infinitely small.
東北大学の論文
1979-09-22

<報文>単粒子の疲労破壊

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