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cyclic number 【數學】完全數。

cyclic poets

The fatigue behavior of strength , stiffness , and deformation of concrete is analysed systematically . the fatigue equation is established . the empirical expressions of the total longitudinal strain and the elastic modulus are given , and the relationships between the increasing rate of the total second - stage strain and the decreasing rate of the elastic modulus with the cyclic number are obtained 系統地分析了砼抗拉、拉-壓疲勞強度、剛度、變形規律;建立了相應的s - n關系,提出了縱向總應變、彈性模量的經驗公式,及其第二階段總應變增長率、彈性模量衰減率分別與疲勞壽命的關系式。