SMF3035HIP焼結材の回転曲げ疲労に対する線形切欠力学による評価

概要

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Fatigue tests of HIP'ed SMF3035 were conducted on specimens with a circumferential groove whose diameters were different. As a result, it is successfully confirmed that linear notch mechanics (LNM) is available for the examination of notch effects in the fatigue of HIP'ed SMF3035. The master curves useful for the estimation of notch effects in HIP'ed SMF3035 were also produced by arranging the experimental data, based on the LNM. The main results obtained are as follows : Estimation of σ_<W1>, σ_<W2> of HIP'ed SMF3035 with arbitrary shape is performed well by the LNM by using the master curve of K_tσ_<W1>, K_tσ_<W2> vs. 1/ρ. There is some relationship between the notch radius of the branch point ρ_O and the static stress-strain curve. The notch radius of the branch point ρ_O is almost 0.5 mm, which is larger than that of steel having the same carbon content, and this may be caused by the different features of the pearlite structure in these two materials.
社団法人日本機械学会の論文
1991-02-25