3D meso-scale fracture modelling and validation of concrete based on in-situ X-ray Computed Tomography images using damage plasticity model
3D meso-scale fracture modelling and validation of concrete based on in-situ X-ray Computed Tomography images using damage plasticity model
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DOI：
10.1016/j.ijsolstr.2015.05.002
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发表时间：
2015-08-15
影响因子：
3.6
通讯作者：
Zhang, Chuanzeng
中科院分区：
文献类型：
--
作者：
Huang, Yujie;Yang, Zhenjun;Zhang, Chuanzeng
建立了基于原位X射线层析成像(XCT)图像的混凝土三维细观有限元模型，并进行了验证。来自巴西式XCT测试的微尺度图像首先被压缩，然后使用带有堆叠算法的体素六面体网格技术将其转换为可管理的中尺度3D网格。用连续损伤塑性模型来模拟复杂的损伤和断裂行为。在试件表面和内部的损伤演化和断裂过程方面，模拟和XCT压缩试验之间有很好的定性一致性。模拟了三维单轴拉伸试验，发现孔洞的分布对强度和裂纹形态有很大的影响。基于图像的三维模型被证明在阐明2D研究无法模拟的复杂裂纹萌生和扩展行为的基本机制方面非常有前途。(C)2015爱思唯尔有限公司。保留所有权利。
Three-dimensional (3D) meso-scale finite element models of concrete based on in-situ X-ray Computed Tomography (XCT) images are developed and validated in this study. The micro-scale images from a Brazilian-like XCT test are first compressed and then transformed into manageable meso-scale 3D meshes using a voxel hexahedron meshing technique with a stacking algorithm. The continuum damage plasticity model is used to simulate complicated damage and fracture behaviour. Excellent qualitative agreement is found between modelling and the XCT compression test in terms of damage evolution and fracture process on both the surface and interior of the specimen. 3D uniaxial tension tests are also simulated, and it is found that the distribution of voids have profound influences on the strength and crack patterns. The image-based 3D models are proved very promising in elucidating fundamental mechanisms of complicated crack initiation and propagation behaviour that 2D studies are incapable of modelling. (C) 2015 Elsevier Ltd. All rights reserved.