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李良权, 徐卫亚, 王伟. 基于西原模型的非线性黏弹塑性流变模型[J]. 力学学报, 2009, 41(5): 671-680. DOI:10.6052/0459-1879-2009-5-2008-068
引用本文: 李良权, 徐卫亚, 王伟. 基于西原模型的非线性黏弹塑性流变模型[J]. 力学学报, 2009, 41(5): 671-680.DOI:10.6052/0459-1879-2009-5-2008-068
Liangquan Li, Weiya Xu, Wei Wang. A nonlinear viscoelastoplastic rheological model based on nishihara's model[J]. Chinese Journal of Theoretical and Applied Mechanics, 2009, 41(5): 671-680. DOI:10.6052/0459-1879-2009-5-2008-068
Citation: Liangquan Li, Weiya Xu, Wei Wang. A nonlinear viscoelastoplastic rheological model based on nishihara's model[J].Chinese Journal of Theoretical and Applied Mechanics, 2009, 41(5): 671-680.DOI:10.6052/0459-1879-2009-5-2008-068

基于西原模型的非线性黏弹塑性流变模型

A nonlinear viscoelastoplastic rheological model based on nishihara's model

  • 摘要:在西原模型的基础上,引入能反映加速蠕变起始点的非线性黏塑性元件和瞬时塑性变形的塑性元件,建立了一个能完整反映蠕变全过程的非线性黏弹塑性流变模型. 在其一维流变模型结构的基础上建立三维的流变模型,推导三维流变方程,接着探讨了在三轴压缩试验中确定三维蠕变参数的方法,并对参数进行了敏感性分析. 用三轴压缩试验结果验证模型的有效性,结果表明模型能很好地模拟蠕变的三阶段,并且在多级偏应力水平下可以采用同一组蠕变参数.

    Abstract:A new nonlinear viscoelastoplastic rheological model is proposed to perfectly describe the global creep behavior in this paper. The present model is based on Nishihara's model by adding two additional elements: one is the nonlinear viscoplastic element which is used to define the onset of the tertiary creep stage; the other is the plastic element describing the instantaneous plastic deformation. Firstly, a three-dimensional model is formulated on the basis of its one-dimensional form. Then, the identification of rheological parameters is investigated in detail. Moreover, the parameter sensibility analysis is performed. The experimental results of triaxial creep test are used to verify the validity of the model. It is shown that the proposed nonlinear viscoelastoplastic rheological model can be used to perfectly describe three creep stages at multiple deviatoric stress levels with a set of rheological parameters.

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