Two- and three-dimensional micromechanical viscoelastic finite element modeling of stone-based materials with X-ray computed tomography images
Two- and three-dimensional micromechanical viscoelastic finite element modeling of stone-based materials with X-ray computed tomography images
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DOI：
10.1016/j.conbuildmat.2010.06.066
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发表时间：
2011-02-01
影响因子：
7.4
通讯作者：
Dai, Qingli
中科院分区：
文献类型：
--
作者：
Dai, Qingli
本文提出了二维和三维微观力学有限元（FE）模型预测的粘弹性性能，包括动态模量和相位角的石基材料（以沥青混合料为例）。非均质沥青混合料是由极不规则集料、沥青基质和少量空隙组成的混合料。沥青混合料的内部微观结构与X射线计算机断层扫描（CT）成像技术捕获。通过重新配置扫描的水平表面图像创建2D和3D数字样本。数字样本的有限元网格是用每个骨料和沥青基质内的图像像素的位置生成的。沿着这两个相的边界，聚集体和基质有限元共享节点以连接变形。微观力学有限元模型是通过将捕获的微观结构和成分特性（粘弹性沥青基质和弹性集料）。将广义麦克斯韦模型应用于粘弹性沥青基质，通过对室内试验数据的非线性回归分析，标定了模型参数。采用基于位移的有限元方法对单轴压缩正弦循环加载进行了模拟。总体而言，预测的动态模量和相位角从二维和三维微观力学模型进行了比较有利的沥青混合料试样的实验室测试数据。使用数字样本的3D模拟比2D模型产生更好的预测。这些结果表明，开发的细观力学有限元模型有能力准确地预测全球的石材基材料的粘弹性性能。(C)2010爱思唯尔有限公司版权所有。
This paper presents 2D and 3D micromechanical finite element (FE) models to predict the viscoelastic properties including dynamic modulus and phase angle of stone-based materials (using an example of asphalt mixtures). Heterogeneous asphalt mixtures are consisted of very irregular aggregates, asphalt matrix and a small amount of air voids. The internal microstructure of asphalt mixtures was captured with X-ray computed tomography (CT) imaging techniques. The 2D and 3D digital samples were created with the reconfiguration of the scanned horizontal surface images. The FE mesh of digital samples was generated with the locations of image pixels within each aggregate and asphalt matrix. Along the boundary of these two phases, the aggregate and matrix FEs share the nodes to connect the deformation. The micromechanical FE model was accomplished by incorporating the captured microstructure and ingredient properties (viscoelastic asphalt matrix and elastic aggregates). The generalized Maxwell model was applied for viscoelastic asphalt matrix with calibrated parameters from the nonlinear regression analysis of the lab test data. The displacement-based FE simulations were conducted for the uniaxial compression under sinusoidal cyclic loading. Overall, the predicted dynamic modulus and phase angle from 2D and 3D micromechanical models were compared favorably with lab test data of the asphalt mixture specimens. The 3D simulation with digital samples generated better prediction than the 2D models. These results indicate that the developed micromechanical FE models have the ability to accurately predict the global viscoelastic properties of the stone-based materials. (C) 2010 Elsevier Ltd. All rights reserved.