浸炭焼入れ鋼の切欠曲げ疲労強度に及ぼす残留応力と平均応力の影響

概要

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Influences of residual stress and mean stress on the endurance limits of gas-carburized specimens which were post-treated with shot peening and/or chemical polishing have been examined.(1)The residual stress influence coefficient m_r (inclination in a diagram of endurance limit and residual stress)is larger in the case of as carburized and shot peened specimens which have a oxidized layer than in the case of chemical polished and shot peened plus chemical polished specimens which the oxidized layer is removed.This means the oxidized layer behaves as a defect.(2)When abovementioned m_r was compared with the mean stress influence coefficient m(inclination in a endurance limit diagram), the m_r was about a half in specimens which included shot peening in the process though both agreed in as carburized and chemical polished specimens.It is necessary to treat separately with the residual stress and the mean stress when the process especially includes shot peening.
社団法人日本機械学会の論文
2000-01-25