Burger model and application thereof

A model and volume model technology, applied in CAD numerical modeling, testing material strength by applying stable shear force, testing material strength by applying stable tension/pressure, etc., can solve the problem of lack of scientific rigor and inaccurate parameters And other issues

Active Publication Date: 2020-10-30
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the calculation process, the MAXWELL body model needs to determine the parameters. In the existing technology, it is a method of parameter matching. The obtained parameters are not accurate and lack scientific rigor.

Method used

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  • Burger model and application thereof
  • Burger model and application thereof
  • Burger model and application thereof

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Embodiment Construction

[0060] The technical solution of the present invention is further described below.

[0061] A Burger model, the Burger model is used to simulate the long-term contact between a first coarse-grained soil particle and an entity, the solid is a rigid wall or a second coarse-grained soil particle with the same material properties as the first coarse-grained soil particle, the Burger model include:

[0062] Make the friction coefficient take an extreme value of 1.0, even if the calculation formula of the discrete element nonlinear contact rheological model parameters does not consider the effect of the slider;

[0063] Set the pull switch to 1, that is, the contact between the first coarse-grained soil particles and the entity only produces pressure, not tension;

[0064] Make the parameters of the four discrete element nonlinear contact rheological models of the Kelvin body model (K body) in the Burger model infinite, that is, the Kelvin body model only transmits loads in the Bur...

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Abstract

The invention discloses a Burger model and application thereof. The Burger model is used for simulating long-time contact between first coarse-grained soil particles and an entity, and the entity is arigid wall or second coarse-grained soil particles with the same material property as the first coarse-grained soil particles. The Burger model comprises the steps that the extreme value of the friction coefficient is 1.0; the tension switch is set to be 1; four discrete element nonlinear contact rheological model parameters of a Kelvin body model in the Burger model are made infinite; the four discrete element nonlinear contact rheological model parameters of an MAXWELL body model in the Burger model are respectively one expression, and the calculation is scientific and accurate.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a Burger model and its application. Background technique [0002] The nonlinear contact model provided by the discrete element program PFC3D (Particle Flow Code in Three Dimensions) for non-viscous granular materials—the modified H-M model (Simplified Hertz-Mindlin contactmodel), the relationship between the normal force and the normal displacement is a curve, However, the normal secant stiffness is always about 1.5 times the normal tangent stiffness, that is, the curvature of the curve is constant, so it is determined that it can only be applied more accurately under the conditions of small strain and compression. If the interparticle contact properties obtained through experiments can be realized in PFC3D, it is difficult to use the existing contact constitutive model, and the program must be redeveloped. [0003] In addition, the built-in Burger m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G01M5/00G01N3/08G01N3/24G06F111/10
CPCG01N3/08G01N3/24G01M5/005G01N2203/0019G01N2203/0025G01N2203/0075G01N2203/0212G01N2203/0246G01N2203/0298G01N2203/0682
Inventor 王子寒韩静肖成志景晓昆黄达
Owner HEBEI UNIV OF TECH
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