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首页> 外文期刊>Journal of Engineering Mechanics >Aggregate Representation Approach in 3D Discrete-Element Modeling Supporting Adaptive Shape and Mass Property Fitting of Realistic Aggregates
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Aggregate Representation Approach in 3D Discrete-Element Modeling Supporting Adaptive Shape and Mass Property Fitting of Realistic Aggregates

机译：3D离散元素建模的聚集成形方法支持适应性的形状和大量性能拟合的现实聚集体

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摘要

Accurate representations of aggregates in stone-based materials are crucial to conducting reliable discrete-element (DE) simulations based on the microstructure of such materials. The objective of this study was to develop an adaptive representation method for aggregates to obtain corresponding clumps of spheres that closely fit realistic shapes and the inertia of the aggregates. Based on the developed three-dimensional (3D) solid model of each aggregate, the methodology consisted of three main steps, as follows: (1) the aggregate contour was displaced with surface spheres of different sizes in predefined fitting accuracy; (2) consequently, the internal space of the model was filled with inner spheres; and (3) eight spheres for inertia calibration were incorporated, with the sphere clump consisting of surface and inner spheres to generate the DE representation of the aggregate. DE representations of 11 aggregate particles were developed using the proposed method. Results imply that the obtained DE representation can occupy the volume of the aggregate more than 99.5% with a properly defined fitting accuracy and fit the aggregate in inertia very well. A numerical simulation of asphalt mixture compaction was conducted using the aggregate models generated in this study. The numerical simulation indicates that the aggregate models generated using the proposed method can be successfully used to generate stone-based materials such as asphalt mixtures.
机译：基于石材材料中的聚集体的精确表示对于进行基于这些材料的微观结构进行可靠的离散元素（DE）模拟至关重要。本研究的目的是开发一种自适应表示方法，用于聚集体以获得紧密符合拟合现实形状和聚集体的惯性的相应球体。基于每个聚集体的开发的三维（3D）固体模型，该方法包括三个主要步骤，如下：（1）骨料轮廓以预定义的拟合精度的不同尺寸的表面球体移位; （2）因此，模型的内部空间充满了内部球体; （3）掺入惯性校准的八个球体，具有由表面和内球组成的球形团块，以产生聚集体的DE表示。使用该方法开发了11个骨料颗粒的DE表示。结果暗示所获得的DE表示可以占据99.5％的总体积，具有适当定义的合适精度，并非常适合惯性骨料。使用本研究中产生的聚集模型进行沥青混合混合物压实的数值模拟。数值模拟表明使用所提出的方法产生的聚合模型可以成功地用于产生基于石材的材料，例如沥青混合物。

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