On the Phenomena of Change of Amplitude of Strain and Stress Accompanied by the Constant Stress and Strain Amplitude Test

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  • 定応力および定ひずみ疲れ試験におけるひずみおよび応力の挙動について
  • テイオウリョク オヨビ テイヒズミ ツカレ シケン ニ オケル ヒズミ オヨビ オウリョク ノ キョドウ ニ ツイテ

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Abstract

The charactaristics of the stress and strain amplitudes accompanied by the strain and stress cycling of constant amplitudes were investigated during the all life of test. Their phenomena are devided into five stages. If stress or strain amplitude has a value enough to fracture within 1000 cycles, the first and the second stages vanish. The fatigue strength of constant stress amp1itude cycling is a little larger than the fatigue strength of the constant strain amplitude cycling. This may be explained by the phenomena of double repeated stress in two levels. The change of stressstrain hysterisis loop accompanied by cyclings is different from the changes of stress amplitude ; although the dynamic modulus of elasticity does not change from about half life to fracture, the form of hysterisis loop changes and the area of loop decreases there.

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