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首页> 外文期刊>Pure and Applied Geophysics >Catastrophic Rupture Induced Damage Coalescence in Heterogeneous Brittle Media
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Catastrophic Rupture Induced Damage Coalescence in Heterogeneous Brittle Media

机译：灾难性破裂引起的非均质脆性介质中的损伤合并

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摘要

In heterogeneous brittle media, the evolution of damage is strongly influenced by the multiscale coupling effect. To better understand this effect, we perform a detailed investigation of the damage evolution, with particular attention focused on the catastrophe transition. We use an adaptive multiscale finite-element model (MFEM) to simulate the damage evolution and the catastrophic failure of heterogeneous brittle media. Both plane stress and plane strain cases are investigated for a heterogeneous medium whose initial shear strength follows the Weibull distribution. Damage is induced through the application of the Coulomb failure criterion to each element, and the element mesh is refined where the failure criterion is met. We found that as damage accumulates, there is a stronger and stronger nonlinear increase in stress and the stress redistribution distance. The coupling of the dynamic stress redistribution and the heterogeneity at different scales result in an inverse cascade of damage cluster size, which represents rapid coalescence of damage at the catastrophe transition.
机译：在异质脆性介质中，损伤的演化受到多尺度耦合效应的强烈影响。为了更好地理解这种影响，我们对损害的演变进行了详细的调查，尤其是针对巨灾过渡。我们使用自适应多尺度有限元模型（MFEM）来模拟非均质脆性介质的损伤演化和灾难性破坏。对于初始剪切强度遵循威布尔分布的非均质介质，研究了平面应力和平面应变两种情况。通过对每个单元应用库仑破坏准则来诱发损坏，并在满足破坏准则的情况下优化单元网格。我们发现，随着损伤的累积，应力和应力再分布距离的非线性会越来越强。动态应力重新分布和不同尺度上的异质性的耦合导致了破坏簇大小的反向级联，这代表了在突变过渡时破坏的快速合并。

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  • 来源
    《Pure and Applied Geophysics》 |2006年第9期|1847-1865|共19页
  • 作者

    Feng Rong; Haiying Wang; Mengfen Xia; Fujiu Ke; Yilong Bai;

  • 作者单位

    State Key Laboratory of Nonlinear Mechanics (LNM) Institute of Mechanics Chinese Academy of Sciences;

    State Key Laboratory of Nonlinear Mechanics (LNM) Institute of Mechanics Chinese Academy of Sciences;

    State Key Laboratory of Nonlinear Mechanics (LNM) Institute of Mechanics Chinese Academy of SciencesDepartment of Physics Peking University;

    State Key Laboratory of Nonlinear Mechanics (LNM) Institute of Mechanics Chinese Academy of SciencesDepartment of Applied Physics Beihang University;

    State Key Laboratory of Nonlinear Mechanics (LNM) Institute of Mechanics Chinese Academy of Sciences;

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  • 正文语种 eng
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  • 关键词

    Heterogeneity; damage evolution; FEM; damage coalescence; catastrophic rupture; stress redistribution;

    机译：异质性;损伤演化;有限元;损伤合并;灾难性破裂;应力重新分布;

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