長寿命域の疲労寿命分布に関する統計的一考察

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The main purpose of the present study was to investigate the fatigue life distribution at stress levels around the endurance limit σ_w. Three multiple-type rotating bending testing machines were manufactured, each of which can test eighteen specimens simultaneously. Approximately twenty specimens were tested at each respective stress level around the endurance limit σ_w with the maximum number of stress cycles of about 5×10^8. The specimens used were heat treated rimmed steel CH10R bars. The results were analyzed using the Weibull distribution of mixed type. The major conclusions are as follows; (1) In the stress range aboveσ_w, there are fixed relationships between the parameters of Weibull distribution and the stress, that is, the shape parameter m is constant, and the scale and location parameters, a and γ, have linear relationships on log a-σ and log γ-log σ diagrams. (2) The Weibull distribution of mixed type F(N)=p_1F_1(N)+p_2F_2(N), p_1+p_2=1, is well fitted to the fatigue life distributions at the stress levels around σ_w. The parameters m_1, a_1 and γ_1 of F_1(N) are given by extending m-σ, log a-σ and log γ-logσ relations in the stress range well above σ_w to the stress range around σ_w. And F_2(N) appears only at the stress levels around σ_w, whose parameter m_2 is constant and parameters a_2 and γ_2 have different linear relationships on log a_2σ and log γ_2-logσ diagrams.
社団法人日本材料学会の論文
1976-09-15

長寿命域の疲労寿命分布に関する統計的一考察

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