In this paper, equivalent tangent modulus is introduced, Poisson ratio effect factor is obtained, Constitutive relation to be easy use in finite element analysis is founded.
本文引入等效切线模量，给出了泊松比影响因子，建立了在有限元分析中使用方便的本构关系。
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The critical aspect ratio of the fiber is defined as the crosspoint of the tangent value of the inflexion and the asymptote of the maximum elastic modulus.