Particle morphology has great influence on mechanical behaviour and hydro/thermal/electrical con-ductivities of granular materials.Surface reconstruction and mesh generation are critical to consider realistic particle shapes in various computational simulations.This study adopts the combined finite-discrete element method (FDEM) to investigate single particle crushing behaviour.Particle shapes were reconstructed with spherical harmonic (SH) in both spherical and Cartesian coordinate systems.Furthermore,the reconstructed surface mesh qualities in two coordinate systems are investigated and compared.Although the efficiency of the two SH systems in reconstructing star-like shapes is nearly identical,SH in Cartesian coordinate system can reconstruct non-star-like shapes with the help of surface parameterisation.Meanwhile,a higher triangular mesh quality is generated with spherical coordinate.In single particle crushing tests,the low mesh quality produces more fluctuations on load-displacement curves.The particles with more surflcial mesh elements tend to have a lower contact stiffness due to more contact stress concentrations induced by complexity of morphology features and more volumetric tetrahedral elements.The fracture patterns are also influenced by mesh quality and density,e.g.a particle with fewer mesh elements has a simpler fragmentation pattern.This study serves as an essential step towards modelling particle breakage using FDEM with surface mesh directly from SH reconstruction.

Deheng Wei;Budi Zhao;Yixiang Gan

School of Civil Engineering,The University of Sydney,Sydney,NSW,2006,Australia;School of Civil Engineering,University College Dublin,Dublin,Ireland

岩石力学与岩土工程学报（英文版）

[1]Deheng Wei;Budi Zhao;Yixiang Gan-.Surface reconstruction with spherical harmonics and its application for single particle crushing simulations)[J].岩石力学与岩土工程学报（英文版）,2022(01):232-239

ductivities,parameterisation,surflcial

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