An elasto-plastic damage constitutive model with double yield surfaces for saturated soft rock
An elasto-plastic damage constitutive model with double yield surfaces for saturated soft rock
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DOI：
10.1016/j.ijrmms.2010.01.002
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发表时间：
2010-04
影响因子：
7.2
通讯作者：
C. Zhou;F. Zhu
中科院分区：
文献类型：
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作者：
C. Zhou;F. Zhu
基于不可逆热力学理论和损伤力学理论，建立了具有双屈服面的弹塑性损伤本构模型。考虑了两种塑性变形机制，包括塑性摩擦和塑性孔洞变形机制。塑性摩擦屈服准则由考虑体积变形效应的抛物线开函数建立，屈服函数在应力空间中的运动受其中心位置和旋转硬化规则的支配。同时，采用Gurson准则建立了塑性孔洞屈服准则，并利用所提出的摩擦屈服模型确定了多孔材料的基质变形。定义了一个损伤变量来描述各种微观缺陷的发展。对不同围压条件下的三轴压缩试验数据进行了数值计算，并与试验数据进行了比较，验证了模型的合理性。
An elasto-plastic damage constitutive model with double yield surfaces is developed based on irreversible thermodynamics theory and damage mechanics theory. Two kinds of plastic deformation mechanisms, including plastic friction and plastic pore deformation mechanisms, are considered. The plastic friction yield criterion is established by a parabolic open function that incorporates the volumetric deformation effect, and the motion of yield function in stress space is governed by its center position and rotation hardening rule. Meanwhile, a plastic pore yield criterion is established by adopting Gurson's criterion using the proposed friction yield model to determine the matrix deformation of porous materials. A damage variable is defined to describe the development of various microscopic defects. Comparisons between numerical predictions and experimental data of triaxial compression tests are presented with various confining pressure conditions to verify the rationality of the proposed model.