周期的階段状温度変動下のクリープ

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タイトル別名
  • Creep under Step-wise Temperature Cycling
  • シュウキテキ カイダンジョウ オンド ヘンドウ カ ノ クリープ

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抄録

In the present paper, the analytical relation of creep under temperature cycling to static creep under steady temperature is presented and is examined by the creep tests under step-wise temperature cycling on low carbon steel, 13 chrominum steel and 18-8 stainless steel. The following are the conclusions from the present study : (1) The experimental creep curves of multiple cycle of step-wise temperature variation under fixed tensile stress are fairly close to the analytical ones based on the concept of "mechanical equation of state in solid" for the case of small value of τ/p, where τ/p denotes the ratio of τ, the time exposed to the reference temperature, to the period p of every cycle. The creep curves under such cyclic temperatures can be predicted from the results of test at constant temperature within an error of 5 per cent in term of strain. (2) The creep strain under cyclic temperatures can be predicted easily form the static creep test data by introducing the equivalent steady temperature Te as defined by Eqs. (9) and (10). The analytical results are in good agreement with the experimental ones.

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