疲れ層の変化と応力　：　ひずみ履歴仕事

概要

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　A torsional fatigue test was undertaken on S35C steel test pieces to find experimentally the relationship among the hysteresis work， the temperature rise due to fatigue，and the development of the　fatigued zone over the surface layer of the tested part.The important result reached is summarized as follows :　　　1） ω kcal/cm^3/cycle being the accumulated fatigue energy per a cycle and q kcal/cm^3/cycle the heat generation per a cycle， on ω-，q-lｏｇ N ｃｏ-ｏｒｄｉｎａｔｅ，ω-ｌｏｇ　N　ｃｕｒｖｅ　ｗas parabollic of the 2nd. order with its axis parallel to ω-axis and with a maximum ω-value.　　　2）The depth of the fatigued layer， evaluated on the assumption that the accumulated fatigue energy at the fracture cycle is equal to the static fracture energy， was of the same order as the most frequent depth of fatigue cracks observed by a x200 optical microscope.　It is concluded that this assumption is almost valid and no energy will be stored in the deeper interior of the material.
北見工業大学の論文