Plastic Fatigue Life of Steel Subjected to a Multiple Repeated Stress under Rotary Bending

概要

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The fatigue damage most closely related to the practical fatigue life of the material should be the accumulation of a power function of the plastic strain. On the basis of this concept, the authors proposed a fracture criterion based on strain under varying strain amplitude instead of the linear damage law, (Σn/N)_f=1,based on stress. The fracture criterion under varying strain amplitude is expressed as below : In the present report, this criterion was extended and applied to the results of the plastic fatigue tests on steels under rotary bending which were carried out over several years in their laboratory. The experimental results were summarized by the above criterion and compared with those calculated by the linear damage law. As a result, this criterion based on strain is found applicable to the estimation of the fatigue life as precisely as under the linear damage law. Although the linear damage law is well established for the low-cycle fatigue, it is expected that the criterion based on strain will be more effective for the ordinary fatigue of comparatively lower stress levels than for the low-cycle fatigue.
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