炭素鋼のねじり疲れにおけるすべり帯の変化とき裂の進展との関係

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The　growth　of　slip　bands　and　the　propagation　of cracks　were　simultaneously observed　by　the　metaloscope　of S 35 C　plain　test　pieces　under　completely　reversed torsional stress cycle. 　　1）The length of the slip bands　and　the　cracks showed　a　similar　tendency of change with the progress of the cycle. Throughout the total fatigue life the cracks are considered to be formed mostly from the persistent slip bands. 2）At the failure cycle the length of the slip bands was shorter and that of the cracks　longer　for　the　larger　stress　amplitude　than　for　the　smaller. As　the　cycle proceeds the cracks seem rather to start from the existent stress concentration sources than to trouble to develop slip lines or bands. 　3）For each over-stress amplitude， smaller than the yielding point， the slip bands became visible at the cycle of about 1％ of the failure cycle. 　　4）For the specimen anisotropic with the axially banded structure as the roII-effect， axial slip bands and cracks as well were　predominant and for one which was made isotropic by the high temperature annealing， such predominance almost vanished. 　　5）The　surface　hardness　of pearlite　of the　fatigued specimen was 0.97 to 1.12 times the hardness of the virgin specimen，the number being larger for the larger stress amplitude，while that of ferrite was just 0.90 to 0.98 times，without such relation with the amplitude.
北見工業大学の論文

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追分重義
北見工業大学

炭素鋼のねじり疲れにおけるすべり帯の変化とき裂の進展との関係

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