ひずみ波形の疲労強度に及ぼす影響について : 双子波の場合

概要

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Fatigue tests in torsion were conducted under completely reversed strain amplitude in order to investigate the influence of strain wave forms on fatigue strength. The changes of stress amplitude were measured during the fatigue test. And approximate hysteresis loops were assumed. The test results are 1) the hysteresis energy of the secondary wave must be larger than limiting value to cause fatigue damage, 2) twin waves are more liable to cause hardening than sinusoidal wave, 3) at the higher plastic strain range (or hysteresis energy range), the twin waves which are equal in total plastic strain (or total hysteresis energy) in one cycle, show the same fatigue live, but at the lower plastic strain range (or hysteresis energy range), the more φ increases, the more the fatigue live increases and 4) the law of linear cumulative damage makes it possible to predict fatigue lives fairly accurately through the use of plastic strain or hysteresis energy.
社団法人日本材料学会の論文
1963-04-15