著者

皮籠石 紀雄 西谷 弘信 後藤 真宏 豊廣 利信 北山 智

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.59, no.557, pp.57-61, 1993-01-25

被引用文献数

2 2

---

Statistical analysis is necessary in evaluating the fatigue life of structures. In the present study, rotating bending fatigue tests were carried out on specimens with two small blind holes of a 5052 A1 alloy in order to investigate the distribution characteristics of the fatigue crack growth life based on the small-crack growth law dl/dN= C_1σ^n_al. The crack growth rate in each specimen was determined uniquely by σ^n_al, therefore the crack growth life can be predicted by the small-crack growth law. On the assumption that the value of n is a fixed one and the value of C_1 is a random variable, the distribution of the crack growth rate can be evaluated through the value of C_3 in the relationship dl/dN=C_3l. C_3 follows a Weibull distribution approximately. The calculated distribution of the ocracy growth life based on the small-crack growth law and the distribution of C_3 was in good agreement with the experimental results.