Fatigue Life of Metallic Materials under Varying Repeated Stresses of Two Different Stress Waves

• Published in: Nippon Kikai Gakkai Rombunshū Vol. 23; no. 127; pp. 136 - 141
• Main Authors: NISHIHARA, Toshio, YAMADA, Toshiro
• Format: Journal Article
• Language: Japanese; English
• Published: The Japan Society of Mechanical Engineers 1957
• ISSN: 0029-0270; 2185-9485
• DOI: 10.1299/kikai1938.23.136

The fatigue tests under varying repeated stresses which consisted of two different bending stresses (the first and second stress waves), were carried out by the specially designed testing machine, using notched specimens of 0.22%, 0.61% carbon steels and super duralumin. These test results were analyzed by the calculating method given to predict the fatigue life of metallic materials subjected to varying repeated stresses like this. And the following are concluded : (1) The analytical fatigue life of 0.22% carbon steel and super duralumin under stresses like this has a good agreement with the test results. (2) In the case of 0.61% carbon steel, the second stress wave has no influence on the fatigue life when the ratio of the second stress wave to the first stress wave, λ, is smaller than about 0.8, and the analytical fatigue lives have a good agreement with the test results only when λ is greater than about 0.8.