衝撃プログラム荷重下における疲労強度と疲労損傷の累積について

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To clarify the understressing effect in the two-steps program load condition involving the transitional impact load at the rise time to higher stress level σ_1, a series of the rotating bending fatigue test have been planned and conducted. On this experiment, the maximum stress σ_<max> introduced by the impact loading and program period m, which is the sum of the period for the primary stress m_1 and that for the secondary stress m_2, were taken as the experimental variables. On the other hand, the period for the primary stress, m_1, was held constant as m_1 = 2 sec., and the magnitudes of the primary and secondary stress, σ_1 and σwere fixed to the values of 13.4 kg/mm^2 and 11.0kg/mm^2 respectively to lie below the fatigue limit of the fundamental S-N curve obtained under the constant load condition. The main results obtained are as follows: It was recognized that the understressing following the maximum stress acted as the weakening factor as a whole in the range of this experiment, and that the cumulative damage in the meaning of the Miner's rule became larger. In other words, the weakening effect of the understressing gradually decreased when the magnitude of the maximum stress took a higher value especially in the case of the relatively short program period m=4. And then, according to the estimation from the view point of the hysteresis energy calculated with the assumption that the cumulative hysteresis energy needed for failure takes the same values in spite of the difference in load pattern, it was revealed that the weakening effect of the understressing increased in its amount but decreased in its contribution fraction when the program period m became longer.
社団法人日本材料学会の論文
1979-02-15

衝撃プログラム荷重下における疲労強度と疲労損傷の累積について

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