A micro-mechanics based plastic damage model for quasi-brittle materials under a large range of compressive stress
A micro-mechanics based plastic damage model for quasi-brittle materials under a large range of compressive stress
复制标题
大范围压应力下准脆性材料的基于微观力学的塑性损伤模型
DOI：
10.1016/j.ijplas.2017.10.004
复制
发表时间：
2018
影响因子：
9.8
通讯作者：
Jian-Fu Shao
中科院分区：
文献类型：
--
作者：
Lun-Yang Zhao;Qi-Zhi Zhu;Jian-Fu Shao
本文提出了一种新的基于细观力学的准脆性材料在大范围压应力作用下的塑性损伤模型。损伤是由于微裂纹的萌生和扩展，而塑性变形则与沿微裂纹的沿着摩擦滑动直接相关。然后，这两个耗散过程被物理耦合。基于Mori-Tanaka均匀化方法和热力学框架，推导了宏观状态方程，定义了损伤和塑性的局部驱动力。提出了描述损伤演化和塑性流动的新准则。这些准则考虑了材料损伤抗力随围压的变化以及微裂纹表面粗糙度在摩擦滑动过程中的退化。给出了宏观峰值强度和体积压缩-压缩转变的解析分析。提出了一种由常规三轴压缩试验确定模型参数的具体标定方法。对三种不同材料的实验数据和一个非常大的范围内的应力所提出的模型的效率进行了验证。所提出的模型很好地捕捉了材料力学行为的所有主要特征。
In this paper, a new micro-mechanics based plastic damage model is proposed for quasi-brittle materials under a large range of compressive stress. The damage is due to initiation and propagation of micro-cracks while the plastic deformation is directly related to frictional sliding along micro-cracks. The two dissipation processes are then physically coupled. With the Mori-Tanaka homogenization procedure and thermodynamics framework, the macroscopic state equations are deduced and the local driving forces of damage and plasticity are defined. New specific criteria are proposed for the description of damage evolution and plastic flow. These criteria take into account the variation of material resistance to damage with confining pressure and the degradation of surface asperity of micro-cracks during the frictional sliding. An analytical analysis of macroscopic peak strength and volumetric compressibility-dilatancy transition is provided. A specific calibration procedure is further proposed for the determination of all model's parameters from conventional triaxial compression tests. The efficiency of the proposed model is verified against experimental data on three different materials and for a very large range of stress. All main features of mechanical behaviors of materials are well captured by the proposed model.
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DOI：
--
发表时间：
1993
期刊：
--
影响因子：
--
作者：
C. Martin
通讯作者：
C. Martin
DOI：
10.1007/bf00186851
发表时间：
1965
期刊：
International Journal of Fracture Mechanics
影响因子：
--
作者：
E. Hoek;Z. Bieniawski
通讯作者：
E. Hoek;Z. Bieniawski
一种精细的微机械损伤摩擦模型，可预测受压岩石材料的强度
DOI：
10.1016/j.ijsolstr.2015.02.005
发表时间：
2015-05
影响因子：
3.6
作者：
Q.Z. Zhu;J.F. Shao
通讯作者：
J.F. Shao
影响因子：
2.5
作者：
E. Hoek;Z. Bieniawski
通讯作者：
E. Hoek;Z. Bieniawski
DOI：
10.1002/nag.551
发表时间：
2007-02
影响因子：
4
作者：
A. Jefferson;T. Bennett
通讯作者：
A. Jefferson;T. Bennett