き裂発生・進展挙動の変動特性を基礎とした非鉄金属材料の確率疲労特性に関する研究(<特集>信頼性工学)

概要

論文の詳細を見る
A large scale database MSDRD on mechanical properties of structural materials was constructed by the Research Group for Statistical Aspects of Materials Strength. In order to extract and analyze the material strength data from MSDRD, a software of STANAD was also developed by this research group. In the present study, fatigue data of aluminum alloys such as 2024-T4 and 5083BE-O were newly analyzed by the same software. Paying particular attention to the statistical feature of the crack initiation and propagation behaviors, statistical fatigue properties (P-S-N characteristics) were theoretically analyzed for smooth and notched specimens. Total fatigue life N_f is given by sum of the crack initiation life N_i and the crack propagation life N_p. Thus we can derive the distribution function of N_f from the respective probability density functions of N_i and N_p by applying the convolution integral. It was finally found that distribution characteristics of fatigue lives in a wide stress range were well explained by the present analytical model.
社団法人日本材料学会の論文
2001-01-15