On mesoscale modeling of concrete: Role of heterogeneities on local stresses, strains, and representative volume element
On mesoscale modeling of concrete: Role of heterogeneities on local stresses, strains, and representative volume element
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混凝土的细观建模：异质性对局部应力、应变和代表性体积单元的作用
DOI：
10.1016/j.cemconres.2022.107031
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发表时间：
2023
影响因子：
11.4
通讯作者：
Hurley, Ryan C.
中科院分区：
文献类型：
--
作者：
Thakur, Mohmad M.;Henningsson, N. Axel;Engqvist, Jonas;Autran, Pierre-Olivier;Wright, Jonathan P.;Hurley, Ryan C.
只有在实验和模拟中考虑混凝土的非均匀微观结构，才能全面理解混凝土的力学。我们首次将介观建模、原位 X 射线计算机断层扫描成像和原位 3D X 射线衍射测量相结合，研究异质性对混凝土宏观和微观响应的作用。这里的重点是微米级的异质性：骨料、水泥浆、界面过渡区、高密度相和空隙。我们特别寻求回答所有级别的异质性是否对于预测至关重要：（a）弹性宏观应力应变响应，（b）微观弹性应力应变集中，以及（c）弹性响应的代表性体积单元尺寸。结果表明，异质性对基体相中的局部应变有显着影响，而异质性对单个晶粒中的应力影响极小。
The mechanics of concrete can be understood comprehensively only if its heterogeneous microstructure is considered in experiments and simulations. We combine mesoscale modeling, in-situ X-ray computed tomography imaging, and in-situ 3D X-ray diffraction measurements for one of the first times to investigate the role of heterogeneities on macroscopic and microscopic responses in concrete. The focus here is on heterogeneities at the micron scale: aggregates, cement paste, interfacial transition zone, high-density phases, and voids. We specifically seek to answer whether all levels of heterogeneities are essential in predicting: (a) elastic macroscopic stress–strain response, (b) microscopic elastic stress–strain concentrations, and (c) representative volume element size for elastic responses. The results demonstrate the significant influence of heterogeneities on local strains in matrix phases and the minimal influence of heterogenities on stresses in individual grains.