3種類の実験室大気条件下におけるS35C焼ならし平滑材の疲労挙動

概要

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Rotating bending fatigue tests of normalized 0.37% C steel smooth specimens were carried out in room air. In order to clarify the effect of air conditions on the fatigue damage, both the temperature and humidity of air were changed for each test. Air conditions used in the tests were moist air at 20℃, moist air at 35℃ and dry air at 35℃. The effect of atmosphere on fatigue behavior was investigated in detail based on successive observations of the surface. Decrease in temperature increased fatigue life ; the effect of moisture was not clear compared to that of temperature. The statistical investigation of crack initiation and propagation behaviors indicated that the temperature strongly affects the crack initiation process ; conversely, moisture plays an important role in the propagation process of cracks smaller than 0.3mm. Moreover, the distribution characteristics of crack initiation life, crack propagation life, fatigue life and crack growth rate were analyzed by assuming either a Weibull distribution or a log-normal distribution.
一般社団法人日本機械学会の論文
1996-06-25