Torsional Fatigue Strength of Piano Wires under the 2-Step Multiple Repeated Varying Strain Amplitudes

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  • 二段二重重複繰返し変動ひずみ下での線材のねじり疲れ強さ
  • 二段二重重複繰返し変動ひずみ下での線材のねじり疲れ強さ-3-腐食期間の影響
  • ニダン ニジュウ チョウフク クリカエシ ヘンドウ ヒズミカ デ ノ センザイ
  • 3rd Report, Effect of Corrosion Terms
  • 第3報 腐食期間の影響

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In order to investigate the torsional fatigue strength of the corroded specimen, the author was carried out the torsional fatigue tests under the condition the multiple repeated varying strain in two strain levels. The test specimens consist of 0.84% C Piano wires corroded 3 months, 6 months and 12 months in 3% NaCl solution.<br>The principal results obtained are summarized as follows:<br>(1) The fatigue strength of Piano wires corroded in 3% NaCl solution is much lower than that in air. The rate of decrease in fatigue strength is smallest for 3 months corroded specimen, and was largest for 12 months corroded specimen among three corrosion terms.<br>(2) From the torsional fatigue test results under 1-step varying strain amplitude in air obtained by using the linear damage criterion is possible an estimate of the fatigue life of the corroded specimen.<br>(3) The test result shows the linear relationship between the total hysteresis energy and the number of cycles to fracture or the total varying strain amplitude, when they are plotted on a log-log scale.

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