二個の貫通欠陥をもつ平板試験片の疲労寿命分布に関する研究
1989 年 38 巻 425 号 p. 130-136
詳細
1989 年 38 巻 425 号 p. 130-136
Statistical fatigue crack growth tests were carried out under axial loading by using 2017-T3 Al alloy plate specimens having a single defect or double defects through thickness. Theoretical derivations were attempted on the fatigue life distributions of a single-defect and double-defect specimens. The former theoretical distribution was derived based on the empirical distribution of the observed crack initiation lives and Paris' law of crack propagation. By using the same assumptions, the latter theoretical distribution was derived on the basis of crack coalescence probability assuming that the failure occurs immediately after the coalescence of cracks. These results were in good agreement with the experimental trends.
