Distribution of Variance of Fatigue Lives of Ferrous Metals by the Analysis of Fatigue Strength Databaseby Tsuyneshichi Tanaka, Ritsumeikan Univ, Japan,
Hideaki Nakayama, Ritsumeikan Univ, Japan,
Takashi Iwaya, Ritsumeikan Univ, Japan,
Abstract: The purpose of this study is to determine the distribution characteristics of variance of fatigue lives of carbon and alloy steels, especially from the viewpoint of their dependence on applied stress levels. The database used in this analysis is the 'Database on Fatigue Strength of Metallic Materials' compiled by the JSMS Committees on Fatigue and on Reliability Engineering. In the case of carbon steels the variance of fatigue lives is well fitted by the log-normal distribution with its median value decreasing with an increase of applied stress. This fact allows us to estimate the variance of fatigue lives at a certain stress with a given confidence level. But in the case of alloy steels, scatter of the variance becomes adruptly large at the lowest stress level, presumably depending on the defect sensitivity of high strength alloy steels.
Subject Headings: Databases | Fatigue tests | Alloys | Strength of materials | High-strength steel
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