3D XCT Mesostructure Characterization and Image-Based Discrete Element (DE) Modelling of Failure Patterns in Coal Gangue Particles (CGPs)

The paper presents an application of milli- and micro-XCT to mesostructure characterization of CGPs and failure patterns analysis using dynamic impact simulations. In this study, XCT scanning experiments are firstly conducted on CGPs, followed by a series of image analyses with qualitative results. Then, the 3D mesomorphological parameters and internal composition of individual particles are quantitatively characterized. Finally, dynamic impact loading in y-axis direction is modelled to investigate the 3D mesostructure and different impact velocity effects on failure patterns of individual particles. The studies show that the mesomorphological parameters present different distribution characteristics in individual CGPs. The approximate location of gangue phase is the key parameter that should be taken into account to study failure patterns as well as fracture mechanism of the heterogeneous rock materials. The XCT image-based numerical model proved to be an effective tool that gives insights into the mesodeformation mechanisms of heterogeneous coal rock (HCR) undergoing dynamic impact failure behavior.

[1]  F. Demir.  Prediction of elastic modulus of normal and high strength concrete by artificial neural networks , 2008 .

[2]  Colin Thornton,et al.  How do agglomerates break , 2004 .

[3]  Jan D. Miller,et al.  Particle damage and exposure analysis in HPGR crushing of selected copper ores for column leaching , 2011 .

[4]  J. Malaiškienė,et al.  Dependence of ceramics physical–mechanical properties on chemical and mineralogical composition , 2011 .

[5]  R. Ketcham.  Three-dimensional grain fabric measurements using high-resolution X-ray computed tomography , 2005 .

[6]  C. L. Lin,et al.  Particle damage during hpgr breakage as described by specific surface area distribution of cracks in the crushed products , 2012 .

[7]  Rajneesh Sharma,et al.  Three-Dimensional In Situ XCT Characterisation and FE Modelling of Cracking in Concrete , 2018, Complex..

[8]  Mark A. Knackstedt,et al.  Multi-scale characterisation of coastal sand aquifer media for contaminant transport using X-ray computed tomography , 2011 .

[9]  Ling Liu,et al.  The algorithm of accelerated cracks detection and extracting skeleton by direction chain code in concrete surface image , 2016 .

[10]  K. Gao,et al.  Modelling heterogeneous coal-rock (HCR) failure patterns under dynamic impact loads using image-based finite element (FE) and discrete element (DE) model , 2020 .

[11]  H. Sebastian Seung,et al.  Trainable Weka Segmentation: a machine learning tool for microscopy pixel classification , 2017, Bioinform..

[12]  Aimin Sha,et al.  Pavement crack classification based on chain code , 2010, 2010 Seventh International Conference on Fuzzy Systems and Knowledge Discovery.

[13]  Veerle Cnudde,et al.  High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications , 2013 .

[14]  Jan D. Miller,et al.  3D characterization and analysis of particle shape using X-ray microtomography (XMT) , 2005 .

[15]  C. L. Lin,et al.  Improved 3D image segmentation for X-ray tomographic analysis of packed particle beds , 2015 .

[16]  Shuzhi Ma,et al.  The Application Of 3-D Discontinuity Network Modeling In Geotechnical Engineering , 2004 .

[17]  Jan D. Miller,et al.  Ultimate recovery in heap leaching operations as established from mineral exposure analysis by X-ray microtomography , 2003 .

[18]  Qingbin Li,et al.  Prediction of elastic modulus and Poisson’s ratio for unsaturated concrete , 2007 .

[19]  A. Chaffee,et al.  Mechanical/thermal dewatering of lignite. Part 3: Physical properties and pore structure of MTE product coals , 2007 .

[20]  Brahmeshwar Mishra,et al.  Impact breakage of particle agglomerates , 2001 .

[21]  C. Du,et al.  Numerical simulation of the impact-breakage behavior of non-spherical agglomerates , 2015 .

[22]  Behrouz Ahmadi-Nedushan,et al.  Prediction of elastic modulus of normal and high strength concrete using ANFIS and optimal nonlinear regression models , 2012 .

[23]  W. S. Rasband,et al.  ImageJ: Image processing and analysis in Java , 2012 .

[24]  A. R. Videla,et al.  Watershed Functions Applied to a 3D Image Segmentation Problem for the Analysis of Packed Particle Beds , 2006 .

[25]  Colin Thornton,et al.  Numerical simulations of impact breakage of a spherical crystalline agglomerate , 2000 .

[26]  D. Wildenschild,et al.  X-ray imaging and analysis techniques for quantifying pore-scale structure and processes in subsurface porous medium systems , 2013 .

[27]  Jan D. Miller,et al.  Cone beam X-ray microtomography — a new facility for three-dimensional analysis of multiphase materials , 2002 .

[28]  Jan D. Miller,et al.  3D characterization of individual multiphase particles in packed particle beds by X-ray microtomography (XMT) , 2007 .

[29]  Markus Oeser,et al.  Investigation on fatigue damage of asphalt mixture with different air-voids using microstructural analysis , 2016 .

[30]  Thomas Kempka,et al.  Physical and mechanical behavior of claystone exposed to temperatures up to 1000 °C , 2014 .

[31]  Ch. Zhang,et al.  Two-dimensional X-ray CT image based meso-scale fracture modelling of concrete , 2015 .

[32]  Yoshitaka Adachi,et al.  Microstructure Detection by Advanced Image Processing , 2017 .

[33]  Jean-Christophe Cuillière,et al.  Generation of a finite element MESH from stereolithography (STL) files , 2002, Comput. Aided Des..

[34]  C. Du,et al.  Particle size distribution of coal and gangue after impact-crush separation , 2017 .

[35]  Jan D. Miller,et al.  Evaluation of a CT-based coal washability analysis system under simulated on-line conditions , 2002 .

[36]  Jing Hu,et al.  A study on fatigue damage of asphalt mixture under different compaction using 3D-microstructural characteristics , 2017 .

[37]  Mark de Berg,et al.  Computational geometry: algorithms and applications , 1997 .

[38]  Y. Matsushita,et al.  Numerical Analysis of 3-D Microstructure of Coke Using Micro X-ray CT , 2012 .

[39]  Sushanta K. Mitra,et al.  Multi scale characterization of coal structure for mass transport , 2015 .