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Modeling method for high-compactness discrete particle heterogeneous system

A modeling method and discrete particle technology, applied in the field of computational materials science, can solve the problems of time-consuming calculation, high calculation cost, insufficient packing density of particle phase, etc., and achieve the effect of ensuring uniformity

Active Publication Date: 2017-12-01
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can solve the problems of insufficient packing density of the particle phase such as random feeding, and the Voronoi method cannot be used for concave particles and cannot control the particle gradation. It is time-consuming, and requires two mesh divisions of shell elements and solid elements, and the calculation cost is high
Also, this method works well when all particles are inside a certain space, but requires special handling when particles intersect model boundaries

Method used

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  • Modeling method for high-compactness discrete particle heterogeneous system
  • Modeling method for high-compactness discrete particle heterogeneous system
  • Modeling method for high-compactness discrete particle heterogeneous system

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A modeling method for a high-density two-dimensional discrete particle multiphase system, comprising the following steps:

[0061] (1) Draw up the contour shape and size of the model, that is, determine the modeling space and its boundary, such as figure 1 The model boundary in , 2 is the model boundary;

[0062] (2) Generate a compact model of each particle according to the predetermined gradation, such as figure 1 The compaction model of each particle in , 1 is the compaction model of the particle;

[0063] (3) Divide the compact model of each particle into two-dimensional plane units, and assign thermoelastic material properties;

[0064] (4) Divide the model boundary into two-dimensional planar units, and assign rigid body material properties independent of temperature;

[0065] (5) Define the contact between particles and between particles and the model boundary as surface-surface contact, so that mutual penetration does not occur;

[0066] (6) In the modeling ...

Embodiment 2

[0080] A method for modeling the three-dimensional mesostructure of high-density particle-reinforced composite materials, comprising the following steps:

[0081] (1) Draw up the contour shape and size of the model, that is, determine the modeling space and its boundary;

[0082] (2) According to the predetermined gradation, the volume sum of the particles in each size range is drawn up, that is, the volume sum of the particle phases in the i~j size range is set as V (i-j) ;

[0083] (3) In the modeling space, randomly obtain several particle models in the size range of i×α~j×α, wherein, α=0.8, so that the volume sum of each particle model is V (i-j) ×β, each particle does not interfere with the surrounding particles, thus the compact model of each particle in the i~j size range is obtained;

[0084] The method for obtaining several particle models in the size range of i×α~j×α includes the following steps:

[0085] a. In the modeling space, randomly generate a point, and us...

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Abstract

The invention discloses a modeling method for a high-compactness discrete particle heterogeneous system. The method comprises the following steps that: determining a model boundary; drawing up the volume sum of particle phases in each dimension range in the model; generating the compression models of the particle models in all dimension ranges; carrying out expansion on each particle in the compression model; and obtaining a high-compactness particle accumulation model. The method can be used for enhancing the modeling of microstructures including particle reinforced composite materials, soft substance particle materials, particle accumulation materials and the like, and can be expanded and applied to short fiber enhanced composite materials. By use of the method, a modeling problem generated when particles and the model boundary are cross is solved, and the modeling method can be applied to the modeling and the analysis of a composite material specimen of which the edge is subjected to machining.

Description

technical field [0001] The invention belongs to the field of computational materials science, and in particular relates to a mesoscale modeling method for the mesoscopic structure of a high-density discrete particle multiphase system, in particular to the mesoscopic structure of particle-reinforced composite materials, soft matter-based granular materials, and particle-packed materials The modeling method can also be extended to short fiber reinforced composites. Background technique [0002] In particle-reinforced composites and soft matter systems composed of particles such as concrete and debris flow, the properties of materials, such as mechanical properties and transport properties, depend heavily on the mesoscopic structure of the material. Therefore, multi-scale modeling for the structure of such materials is of great significance for the performance analysis of materials and the optimal design of material structures. [0003] Granular materials, as complex multi-sca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2111/10
Inventor 季忠刘韧张纪芝生培瑶邹方坤
Owner SHANDONG UNIV
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