ステンレス鋳鋼切欠材および段付材の疲労強度 : 線形切欠力学に基づく検討

概要

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Fatigue tests were carried out on notched and shouldered specimens of a cast stainless steel under rotating bending and reversed torsion. It is shown that the fatigue strength of a notched or a shouldered specimen having an arbitrary size under the two loading conditions can be predicted systematically based on the concept of the linear notch mechanics (LNM). The main results are summarized as follows : (1) In the case of rotating bending, it was found that the fatigue strength of notched and shouldered specimens having an arbitrary size can be estimated on the basis of the LNM. (2) In the case of reversed torsion, the value of τ_<w1> (fatigue limit based on crack initiation) can be estimated successfully using the LNM. But the value of τ_<w2> cannot be estimated using the LNM, because the final fracture of the specimen is not controlled by the stress fields of the minimum section alone. (3) The fatigue limit based on crack initiation under the two loading conditions can be estimated systematically using the LNM.
一般社団法人日本機械学会の論文
1997-11-25