繰返し衝撃荷重に対する構造用炭素綱の疲労強度についての破壊確率論的推定(<小特集>信頼性工学小特集)

概要

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Properties of the scatter distribution of impact fatigue strength were experimentally investigated on smoothed and circumferentially notched specimens of four structural carbon steels. Based on the probability relations between parameters of impact fatigue strength and static tensile properties, the impact fatigue strength was estimated analytically from static tensile properties. The results obtained were summarized as follows ; (1) The impact fatigue strength a shows the scatter of a logarithmic normal distribution and can be evaluated as the probability value by the following formula. σN_f^m^^_0^α^aT^m_0=α^cD_0μs^u where N_f is the life to failure, T is the duration time of an impact load, D_0 and m_0 are the parameters of impact fatigue strength, a and c are the experimental constants, α is the stress concentration factor and μ and s are the parameters of scatter properties. (2) The parameters of scatter properties for the impact fatigue strength, μ and s, can be estimated from those of the static tensile properties (σ_B, φ)with a logarithmic normal distribution. (3) The scatter of impact fatigue strength for the notched specimens must be estimated about 1. 03 times as large as that for the smoothed ones. (4) The scatter of impact fatigue strength for the smoothed specimens needs to be estimated 1. 032 times as large as that of static tensile strength.
社団法人日本材料学会の論文
1981-01-15