Site-bond Modelling of Structure-failure Relations in Quasi-brittle Media
Site-bond Modelling of Structure-failure Relations in Quasi-brittle Media
复制标题
准脆性介质中结构-失效关系的位点键建模
DOI：
10.1016/j.mspro.2014.06.302
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Jivkov A
中科院分区：
文献类型：
--
作者：
Jivkov A
准脆性介质的非线性行为源于分布的微裂纹。这是方便地分析离散格模型。一个3D的网站键模型是专门为具有三相微观结构的材料：刚性夹杂物在一个兼容的矩阵含有孔隙。的变形行为是基于解析导出的债券性质，长度尺度和宏观弹性常数之间的关系。微观结构模型映射基于夹杂物和孔隙的尺寸分布和体积密度，通常通过分析3D图像获得。内含物数据用于计算所需的长度比例。孔隙数据用于定义单个键的失效行为。该方法在水泥基材料和核石墨中的应用在本卷中分别介绍。
The non-linear behaviour of quasi-brittle media emerges from distributed micro-cracking. This is analysed conveniently by discrete lattice models. A 3D site-bond model is specialised here for materials with three-phase microstructures: stiff inclusions in a compliant matrix containing pores. The deformation behaviour is based on analytically derived relations between bond properties, length scale and macroscopic elastic constants. The microstructure-model mapping is based on size distributions and volume densities of inclusions and pores, typically obtained through analyses of 3D images. Inclusions data is used to calculate the required length scale. Pores data is used to define the failure behaviour of individual bonds. Applications of the methodology to cement-based materials and nuclear graphite are presented separately in this volume.