Construction of 3D Digital Model of Aggregate in Discrete Element Method

被引：0
|
作者：
Li Z. [1 ]
Wang Z. [1 ]
Wu W. [1 ]
Sun Y. [2 ]
机构：
[1] School of Civil Engineering and Transportation, South China University of Technology, Guangzhou
[2] Guangdong Provincial Academy of Building Research Group, Guangzhou
来源：
Hunan Daxue Xuebao/Journal of Hunan University Natural Sciences | 2019年 / 46卷 / 11期
基金：
中国国家自然科学基金;
关键词：
Aggregat; Discrete element method; Fish code; Highway engineering;
D O I：
10.16339/j.cnki.hdxbzkb.2019.11.012
中图分类号：
学科分类号：
摘要：
Based on 3D modeling and PFC 5.0 platform FISH language, a method for constructing aggregate 3D discrete element model was developed. The aggregate particle geometry was constructed based on three-dimensional modeling and the aggregate geometry was imported into the PFC 5.0 platform to construct a clump template that can characterize the aggregate geometry. Then, clump template was called to generate clump in a certain space for aggregate discrete element simulation. In order to evaluate the effectiveness and accuracy of the method, the degree of filling was used to evaluate the effect of clump on the geometry of the aggregate and the number of unit spheres was used to quantify the impact of virtual aggregates on computational efficiency. The relationship between geometric shape accuracy and the efficiency of the filling algorithm was analyzed. In addition, the effect of fill algorithm parameters on fill level and number of unit spheres was explored. The results show that the number of geometrical feature points of aggregates is 1 000 ~ 2 000, which can take advantage of the filling algorithm. The clump block generated by the recommended parameters of the filling algorithm can better balance the filling precision and calculation efficiency. The method can realize the low-cost and high-efficiency generating three-dimensional discrete element model of aggregate, and provide powerful technical support for further digital test piece simulation. © 2019, Editorial Department of Journal of Hunan University. All right reserved.
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页码：106 / 113
页数：7
相关论文
共 20 条
  • [1] Wang H.N., Zhang C., Fang J., Et al., Study on low temperature performance and microstructure of rubber hot recycled mixture, Journal of Hunan University(Natural Sciences), 41, 11, pp. 123-128, (2014)
  • [2] Zhang D., Research on morphology of coarse aggregates and its mechanical performance by discrete element modeling, pp. 11-14, (2013)
  • [3] Chang G., Meegoda J., Micromechanical model for temperature effects of hot-mix asphalt concrete, Transportation Research Record Journal of the Transportation Research Board, 1687, 1, pp. 95-103, (1999)
  • [4] Chang G., Meegoda J., Micromechanical simulation of hot mix asphalt, Journal of Engineering Mechanics, 123, 5, pp. 495-503, (1997)
  • [5] Ng K., Dai Q., Investigation of fracture behavior of heterogeneous infrastructure materials with extended-finite-element method and image analysis, Journal of Materials in Civil Engineering, 23, 12, pp. 1662-1671, (2011)
  • [6] Chen J.S., Huang B.S., Chen F., Et al., Application of discrete element method to superpave gyratory compaction, Road Materials & Pavement Design, 13, 3, pp. 480-500, (2012)
  • [7] Khanal M., Tomas J., Application of DEM to evaluate and compare process parameters for a particle failure under different loading conditions, Granular Matter, 12, 4, pp. 411-416, (2010)
  • [8] Lu M., Mcdowell G.R., The importance of modelling ballast particle shape in the discrete element method, Granular Matter, 9, 1-2, (2007)
  • [9] Liu Y., You Z., Visualization and simulation of asphalt concrete with randomly generated three-dimensional models, Journal of Computing in Civil Engineering, 23, 6, pp. 340-347, (2009)
  • [10] Wang J.Y., Qian Z.D., Wang L.B., Three-dimensional visualization discrete element modeling of the crack development of epoxy asphalt concrete, Journal of Hunan University(Natural Sciences), 41, 6, pp. 112-119, (2014)
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