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首页> 外文会议>Fifth International Seminar on Geometry Continua and Microstructures; Sep 26-28, 2001; Sinaia, Romania >Micromechanical Models for Anisotropic Damage in Ductile Materials Accounting for the Evolution of Microstructure
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Micromechanical Models for Anisotropic Damage in Ductile Materials Accounting for the Evolution of Microstructure

机译：考虑到微观结构演变的延性材料各向异性损伤的微力学模型

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摘要

This study reviews two models of anisotropic damage in ductile materials and compare their predictions with numerical cell calculations. Both models, considered in the present study, give instantaneous constitutive relations derived from an effective dissipation potential for the porous material, and evolution equations for microstructural parameters (size, shape and distribution of voids). These models belong to two different classes of modeling of the effective behaviour of porous materials. In the first model (GMS), the dissipation potential is obtained by an extension of Gurson's analysis to spheroidal voids. The second model (KPCW) is based on a variational formalism, which use a linear comparison solid to derive the effective behavior of the porous material. The comparisons with numerical simulations show that the first model is accurate when the stress triaxiality is high, while the second model is accurate for low stress triaxiality.
机译：这项研究回顾了韧性材料中两种各向异性损伤的模型，并将它们的预测与数值单元计算进行了比较。在本研究中考虑的两个模型都给出了从多孔材料的有效耗散潜力得出的瞬时本构关系，并给出了微结构参数（空隙的大小，形状和分布）的演化方程。这些模型属于多孔材料有效行为建模的两个不同类别。在第一个模型（GMS）中，耗散潜力是通过将Gurson分析扩展到球状空隙获得的。第二个模型（KPCW）基于变式形式，它使用线性比较实体来得出多孔材料的有效行为。与数值模拟的比较表明，当应力三轴性较高时，第一个模型是准确的，而对于应力三轴性较低，第二个模型是正确的。

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