試作せる複合ひずみ波形ねじり疲れ試験機およびその試験結果について

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  • Composite Strain Wave Fatigue Testing Machine and Some Experimental Results
  • シサクセル フクゴウ ヒズミハケイネジリ ツカレ シケンキ オヨビ ソノ シケン ケッカ ニ ツイテ

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In this paper the influence of strain wave form on fatigue life was investigated as one of the fundamental researches on fatigue phenomena under actual load. A torsional fatigue testing machine was designed to generate a composite wave form γ=γ1'sin (2πft)+γ2'sin (4πft), and some experiments were carried out on a mild steel. The principle of the machine is to combine two different strain waves γ1' and γ2'. The result is as follows : The strain amplitude smaller than the endurance strain γw has little influence on the fatigue damage. And the fatigue life under the composite waves are approximately predicted by using γp-N curve or γ-N curve and the linear damage law. Also, it has been revealed that the endurance strain limit is nearly equal to the torsional strain at yield point.

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