Numerical modeling method for three-dimensional irregular-shaped particle putting based on voxel matrix

A numerical modeling and irregular technology, applied in CAD numerical modeling, design optimization/simulation, etc., which can solve the problems of limiting the wide application of particle placement methods, low particle packing density, and large calculation time.

Active Publication Date: 2020-05-15
ZHEJIANG UNIV
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Problems solved by technology

However, these methods still have many limitations and deficiencies, such as only suitable for convex particles or star-shaped particles, the packing density of particles is low, and a large amount of computing time is required
This largely limits the widespread application of the above particle delivery methods

Method used

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  • Numerical modeling method for three-dimensional irregular-shaped particle putting based on voxel matrix
  • Numerical modeling method for three-dimensional irregular-shaped particle putting based on voxel matrix
  • Numerical modeling method for three-dimensional irregular-shaped particle putting based on voxel matrix

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Embodiment example

[0059] In this case, the method described is used to simulate the random distribution of coarse aggregate in concrete, thereby establishing a model of the internal mesostructure of reinforced concrete beams. X-ray CT technology is used to scan the internal structure of the concrete block in three dimensions, and then threshold segmentation and binarization are performed on the experimental data, so as to extract the three-dimensional shape information of the real aggregate and establish an aggregate database. The gradation of concrete coarse aggregate can be expressed by the particle size distribution function:

[0060]

[0061] In the formula, d is the particle diameter, f is the cumulative volume fraction of the diameter smaller than d, and d 63 is the diameter corresponding to the cumulative volume fraction of 63.21%, and a is the index parameter. Based on the experimental data of coarse aggregate gradation, the parameter in the above equation is taken as d 63 =10, a=3...

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Abstract

The invention relates to the field of building material design, and aims to provide a numerical modeling method for three-dimensional irregular-shaped particle putting based on a voxel matrix. The method comprises geometrical shape description of particles, random putting of the particles and overlapping judgment of the particles, wherein the geometrical shape description of the particles is usedfor accurately describing geometrical information of the three-dimensional irregular-shaped particles, and the random putting of the particles comprises random placement and rotation of the particles,overlapping judgment of the particles and recording of geometrical transformation information of the particles; the overlapping judgment of the particles refers to overlapping judgment of three-dimensional irregular-shaped particles based on a voxel matrix, and comprises extraction of a local matrix and matrix comparison. The feeding efficiency of particles can be greatly improved, and the feeding time is shortened; higher particle stacking density is realized; the method is suitable for various irregular-shaped particles which comprises spherical particles, polyhedral particles, non-convex particles and the like; the method is suitable for complex boundary conditions and large-scale particle feeding.

Description

technical field [0001] The invention relates to the field of building material design, in particular to a numerical modeling method for three-dimensional irregular particle delivery based on a voxel matrix. Background technique [0002] Composite materials are heterogeneous materials prepared by two or more materials through a composite process, usually composed of a continuous phase matrix and particles wrapped by the matrix. In order to study the overall performance of the material, such as mechanical behavior and transmission characteristics, it is necessary to establish a geometric model of the composite material. The particles inside the composite material need to meet certain constraints, that is, the particles do not overlap each other. Therefore, establishing an efficient and practical overlapping determination method is a key issue in particle delivery. [0003] Most of the existing delivery methods are based on simple geometric shapes: for two-dimensional composi...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F111/10
Inventor 田卒士田野纪豪栋金南国金贤玉徐鑫
Owner ZHEJIANG UNIV
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