Influence of Temperature History on Creep

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  • クリープにおける温度履歴の影響
  • クリープ ニ ヨル オンド リレキ ノ エイキョウ

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Abstract

In the present paper, some problems of temperature history on transient stage creep are discussed, and the experimental and analytical results on 0.15 per cent carbon steel are presented. From these results the following are concluded : (1) In the case of single temperature cycle as shown in Fig.5 (a) under fixed tensile stress, the "incubation period" is observed immediately after the lowering of temperature and it is found that the period depends on the time interval t' elapsed under a higher temperature level, being larger for the larger t'. (2) In the case of Fig.5 (b), it is found that the amount of strain increment just after the raise of temperature is likely to depend on both the time interval t' elapsed under a lower temperature level, being slightly larger for the larger t', and the strain at which the temperature is lowered from the reference temperature T0, being larger for the small strain. (3) The effect of temperature history on creep is composed of transitional change in internal yield stress, that is, recovery or aging, where the internal yield stress is defined as the local stress at which deformation beings without the aid of thermal fluctuation. (4) From a practical point of view, however, these effects are negligibly small and the concept of "mechanical equation of state in solid" is applicable to the prediction of creep under such temperature variation, within an error of 5 per cent in terms of strain.

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