捩り疲労試験における疲労累積の実験的研究

概要

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Previously the authors reported, how and why the fatigue torque T_W and other factors to quantify fatigue effects in the torsional fatigue test, could be measured and obtained. In this study, the experiment was carried out to obtain those values with more accuracy, reconditioning the chucking device of specimens so that the torque at the spot nearer to the specimen could be measured and making the repeating speed smaller, than in the previous experiment. 0verstresses less than the yielding point, i.e. 11.5〜20.3 kg/mm^2 were repeated on S 35 C specimens at the speed of 15 cps. The transitions of T_W/T, q_a .and Q/W through the stress-repeated life showed some remarkable characteristics, which are appreciable from the criterion of the so-called stages of fatigue process. Here, T_W＝fatigue torque, T＝testing torque, Q＝fatigue heat generation per a cycle, W＝fatigue work per a cycle, q_a＝increase of Q per a cycle.
北見工業大学の論文