Abstract A micromechanics-based plastic damage model including localised failure is proposed in the present work for heterogenous materials which can be treated as a porous matrix reinforced by mineral inclusions. This model explicitly considers the influences of pores and inclusions volume fractions, also the solid phase dilatancy on the overall mechanical performance. The induced damage in solid phase is also considered. Based on this two-scale model, the bifurcation analysis is performed to detect both the onset and orientation of localization band. Numerical simulations are carried out for different cases. It is found that the material’s microstructure affects importantly the onset point of the localization and the post-localization behavior. As an example of validation, the proposed model enhanced with localization analysis is then adopted to predict the overall mechanical response before and post localization of this typical claystone. Comparing with the experimental results, the capacity of this enhanced modelling is clearly demonstrated.

中文翻译：

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一种基于微力学的增强塑性损伤模型，包括异质岩土材料的定位分析

摘要 目前的工作中提出了一种基于微观力学的塑性损伤模型，包括局部失效，用于异质材料，可以将其视为由矿物包裹体增强的多孔基体。该模型明确考虑了孔隙和夹杂物体积分数的影响，以及固相膨胀对整体机械性能的影响。还考虑了固相中的诱导损伤。基于这个双尺度模型，进行分叉分析以检测定位带的起始和方向。针对不同情况进行数值模拟。结果表明，材料的微观结构对定位的起始点和定位后的行为有重要影响。作为验证的例子，然后采用通过定位分析增强的建议模型来预测这种典型粘土岩定位前后的整体力学响应。与实验结果相比，这种增强建模的能力得到了清晰的证明。