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Simple particle shapes for DEM simulations of railway ballast: influence of shape descriptors on packing behaviour.
Granular Matter ( IF 2.3 ) Pub Date : 2020-03-23 , DOI: 10.1007/s10035-020-1009-0 Bettina Suhr 1 , Klaus Six 1
中文翻译:
铁路道砟 DEM 模拟的简单粒子形状:形状描述符对包装行为的影响。
更新日期:2020-03-23
Granular Matter ( IF 2.3 ) Pub Date : 2020-03-23 , DOI: 10.1007/s10035-020-1009-0 Bettina Suhr 1 , Klaus Six 1
Affiliation
Abstract
In any DEM simulation, the chosen particle shape will greatly influence the simulated material behaviour. For a specific material, e.g. railway ballast, it remains an open question how to model the particle shape, such that DEM simulations are computationally efficient and simulation results are in good accordance with measurements. While DEM shape modelling for railway ballast is well addressed in the literature, approaches mainly aim at approximating the stones’ actual shape, resulting in rather complex and thus inefficient particle shapes. In contrast, very simple DEM shapes will be constructed, clumps of three spheres, which aim to approximate shape descriptors of the considered ballast material. In DEM simulations of the packing behaviour, a set of clump shapes is identified, which can pack at porosities observed at track sites, as well as in lab tests. The relation between particle shape (descriptors) and obtained packing (characteristic) is investigated in a correlation analysis. The simulated packing’s porosity is strongly correlated to four shape descriptors, which are also strongly correlated among each other. Thus, to derive simple shape models of a given particle shape, matching one of these shape descriptors, might be a good first step to bring simulated porosities closer to measured ones. The conducted correlation analysis also shows that packing’s coordination number and isotropic fabric are correlated to more shape descriptors, making it more difficult to estimate the effect of particle shape on these quantities.Graphic abstract
中文翻译:
铁路道砟 DEM 模拟的简单粒子形状:形状描述符对包装行为的影响。