Fatigue Damage of 6-4 Brass Specimens

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  • 繰返し応力によって6-4黄銅が受ける被害について
  • クリカエシ オウリョク ニ ヨッテ 6-4 オウドウ ガ ウケル ヒガイ ニ ツイテ

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Abstract

By annealing and electro-polishing technique it was shown that the fatigue damage of 6-4 brass specimens is confined within a thin surface layer of the specimens. The thickness of the damaged layer becomes thicker when the applied stress is high and the number of stress repetitions is large. The rate of growth of the thickness of the damaged layer begins to increase rapidly, when its thickness exceeds some threshold value (in the present case, 30∼50 microns). The fatigue damage occurring beneath the surface layer of the specimen seems to be of strain-hardening character and it disappears by stress relief annealing. It seems from this work that the fatigue limit is the stress under which the thickness of the damaged layer remains within some limit, even if the number of stress repetitions is infinitely large.

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