高温疲れに及ぼす繰返し速度の影響

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  • Influence of Frequency of Stress Cycles on Fatigue at Elevated Temperature
  • コウオン ツカレ ニ オヨボス クリカエシ ソクド ノ エイキョウ

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Rotating bending tests under constant strain amplitude were carried out on a 0.55 percent carbon steel and a 13 chromium steel. The test temperature was ranged from 450°C to 600°C and the frequency of stress cycles was 170 and 1 500 cpm. The results are discussed together with the results of low carbon steel obtained previously and the following conclusion is established. Both the 0.55 percent carbon steel and the 13 chromium steel exhibited the same fatigue characteristics above a critical temperature as that of the low carbon steel. These characteristics may be regarded as the general ones for the materials of stable structure. It may be summarized as follows : When fatigue tests are made at different frequencies under the same strain amplitude, specimens fracture approximately after the same number of strain cycles in the range of large strain amplitude, whereas for small amplitude fractures occur in nearly equal duration of time. These tendencies suggest that the fatigue at elevated temperature is a sort of rate processes and is closely connected with the plastic deformation of material under alternating load. These results were interpreted on the basis common to the dynamic creep rupture.

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