日本金属学会誌

J. Japan Inst. Metals, Vol. 16, No. 9 (1952),
pp. 479-482

A New Theory of Fatigue Founded on the Hypothesis that the Distribution of Internal Stresses Varies with Fatigue. (Part III) Alternating Tension and Compression of a Round Bar.

Ryûtaro Nagai1

1Department of Physics, Tokyo Gakugei University,

Abstract:

The chief difference from the theories in the first and second reports is that the condition of the total moment maintained constant is replaced by the condition of the total stress maintained constant. In the case of a round bar where the stresses in the interior are smaller than those on the periphery, the following formulae are obtained:

When the stresses in the interior are larger than those on the periphery, we have
In the special case of almost homogeneous distribution of strains, the fatigue strength σ W for completely reversed cycles of longitudinal stress tends toward H1 which is equal to the fatigue strength for completely reversed bending stress, in our idealized models, in agreement with experiments(1)(2).


(Received 1952/5/12)

Keywords:


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.