Influence of Frequency of Stress Cycles on Fatigue at Elevated Temperatures

概要

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Rotating bending fatigue tests under constant strain amplitude were carried out with a 0.55 percent carbon steel and a 13 chromium steel to study the influence of frequency of stress repetition on the fatigue strength of materials. The test temperature was from 450℃ to 600℃ and the frequencies of stress cycles were 170 and 1500 c.p.m. Both the 0.55 percent carbon steel and the 13 chromium steel showed the fatigue behavior characteristic to the elevated temperature above a critical temperature. That is, at a large amplitude, the specimens fractured at a definite number of stress cycles irrespective of frequency and, at a smaller amplitude, specimens tested at lower frequency fractured at less cycles than those at higher frequency. These characteristics are the same as those of low carbon steel studied previously, and suggest that the fatigue at elevated temperatures is a sort of rate processes and is closely related with the plastic deformation of material under alternating load. Interpretations were made on the common basis with the dynamic creep rupture.
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