金属材料疲労強度データベースによる機械構造用炭素鋼の確立疲労特性の解析(<小特集>信頼性工学小特集)

概要

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A database on the fatigue strength of metallic materials was compiled by collecting the experimental fatigue data of the last 20 years in Japan on a nationwide scale as a project in JSMS Committee on Fatigue. In particular attention to statistical fatigue properties, the authors have been analyzing P-S-N characteristics of carbon steels for machine structural use in this database. When these fatigue data were plotted altogether on S-N coordinates, they were widely dispersed due to a wide range of strength levels of metals. The tensile strength σ_B was taken up as a typical parameter of the strength level, and the applied stress was normalized by σ_B. Then all the data were replotted as a σ_a/σ_B-N diagram. Thus we have all the data points yielded in a relatively narrow scatter band. By examining the effects of material and testing conditions on S-N property, it was found that all the S-N plots were succesfully classified into the following four groups; (1) S10C〜S15C, (2) S20C〜S40C, (3) S45C〜S58C(pered), and (4) S45C〜S58C(Except for Quenched & Tempered). Quantitative P-S-N characteristics were finally analyzed for each group based on the stress dependency of the fatigue life distribution. The theoretical results thus obtained were in good agreement with the statistical fatigue properties of respctive groups of the materials.
1987-09-15