多段重複繰返し応力によるき裂発生とその進展

概要

論文の詳細を見る
Many studies have hitherto been published on multiple repeated stress tests, most of which are based on the final fatigue fracture consideration. The research on the fatigue has mainly been made in consideration. The research on the fatigue has mainly been made in consideration. The research on the fatigue has mainly been made in consideration of the effect of repeated cycle stress based on the number of cycles and stress amplitude at final fracture. In this report the auther tries to take into account no only the failure point but also, and still more, the crack initiating point and the crack propagation process. This report is intended then to show the progress of fatigue in two separate steps, first up to the crack initiation period and then during the crack propagation period. The test has been made by means of a rotary bending fatigue testing machine, using as specimen a low carbon steel (0.17%C) bar with a V shaped notch. The results obtained are as follows in brief. (1) In the test of constant stress amplitude, the rate of crack propagation dλ/dN is low when the crack is initiated, then it shows a sudden increase after a certain depth of the crack is attained. This may be attributed to the stress concentration on the crack which begins to show crack-tip. (2) The effect of the repeated cycle stress prior to initiation of the crack on the width of the crack and the number of the crack initiating cycle seems to follow the linear damage law.
社団法人日本材料学会の論文
1966-02-15

多段重複繰返し応力によるき裂発生とその進展

スポンサーリンク

概要

著者

関連論文

スポンサーリンク