履歴法による実働応力下の疲れ寿命の推定法

概要

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At the fatigue test under actual load, the induced strains become rather stabilized after some number of cycles, and the stress-strain curves show loops according to the stress wave forms. Therefore, plastic strain ε_p is supposed to be caused by the deviatric stress of each stress peak i from the mean stress of the wave. Then, the influence of other stress peaks for the ε_p of a peak is analogized bv the static stress-strain curve in the plastic range. And the stress amplitude of ordinary fatigue test that causes the same plastic strain as the peak i is called as an equivalent stress amplitude σ_<eq, i> and its cumulative distribution curve is drawn. And then, program test or cumulative fatigue damage law according to the distribution curve is adopted the evaluation of fatigue lives under the actual stress wave form.
一般社団法人日本機械学会の論文
1964-04-25