鋼の回転曲げ疲労過程で発生するひずみエネルギ変化に及ぼす温度変化の影響

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By applying a method of analyzing the plastic and quasi-elastic strain energies on the actual fatigue tests of carbon steel, the authors previously made clear the effect of temperature change in the atmosphere around specimens on the change in strain energy of one kind of carbon steel and obtained the ralationships between these energies and the structural changes appearing gradually on the surface of specimen. Furthermore, the dependence of the features of fractographs on the temperature conditions was also investigated. In the present experiment, the following four cases were adopted as the temperature conditions of atmosphere around the specimen: (1) the constant temperature at +20±2℃ up to rupture of the specimen, (2) the constant temperature at -20±2℃, (3) changing the temperature from +20℃ to -20℃ after a certain number of cycles and (4) changing the temperature in the reverse way of (3). The main results obtained are as follows: (1) The circumferential temperature change brought in a certain stage on the fatigue process has important effects upon several fatigue phenomena including the strain energy changes and the failure repetitions of a specimen. (2) The change in the sum of quasi-elastic strain energy with the progress of fatigue can be expressed generally in Σ^^q__<q=1> (U)_q=A・q^k up to rupture of specimen. where A is the initial value defined by the ordinary elastic energy calculation. q is the number of stress repetitions. k is a constant depending upon the property of test material, the method of experiment and the circumferential temperature condition.
社団法人日本材料学会の論文
1974-04-15

鋼の回転曲げ疲労過程で発生するひずみエネルギ変化に及ぼす温度変化の影響

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