低温における切欠き材の疲れ強さ

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タイトル別名
  • The Fatigue Strength of Notched Specimens at Low Temperatures
  • テイオン ニ オケル キリカキ ザイ ノ ツカレ ツヨサ

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抄録

Fatigue tests on killed-steel, mild steel and 18-8 stainless steel, using notched and unnotched specimens under tension-compression stress have been made at room temperature, -55°C and -195°C. The test results obtained are summarized as follows : (1) The endurance limits and the fatigue reduction factor for notched specimens increase with decreasing testing temperature and also the endurance limits for very sharply notched specimens at low temperature are nearly equal to that at the room temperature.(2) At -195°C the endurance limit for unnotched specimen made of killed-steel is larger than that for 18-8 stainless steel stecimen, and the endurance limits for notched specimens having the stress concentration factor α=4 are equal to 18 kg/mm2 in both steels. The severe embrittlement of the killed-steel shown by Charpy impact test at low temperature is not reflected to the same extent in the fatigue test results.(3) The endurance ratio (fatigue limit/UTS) for notched specimens made of killed-steel remains constant with decreasing testing temperature from the room temperature to -55°C and then decreases with lowering temperature to -195°C, whereas the endurance ratio for notched specimens made of 18-8 stainless steel is less than that for killed-steel specimen and decreases with lowering testing temperature.

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