Fatigue Fracture of Single Particles

概要

論文の詳細を見る
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 apparatuses utilizing an electromagnet. The experimental results are summerized 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 untill 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) For 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, for the minearls, fracture energy and fracture surface energy increase with the decrease of the repeated compressive stress, but new surface produced is remained approximately constant independently of the repeated compressive stress. 5) The influences of water on fracture energy, new surface produced and fracture surface energy are negligible under the fatigue fracture test.
東北大学の論文

Fatigue Fracture of Single Particles

スポンサーリンク

概要

著者

関連論文

スポンサーリンク