Discrete element method-based damping calculation simulation method for a macrostructure of a non-cohesive particle material

A granular material and macro-structure technology, applied in computing, special data processing applications, instruments, etc., it can solve the problem that discrete element software cannot accurately calculate structural damping, etc., and achieve the effect of accurate and effective testing.

Active Publication Date: 2019-05-31
SOUTHEAST UNIV
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Problems solved by technology

[0003] Technical problem to be solved: This application mainly proposes a method for calculating and simulating the macroscopic structural damping of non-cohesive granular materials based on the discrete element method, which solves the technical problems existing in the prior art that the discrete element software cannot accurately calculate the structural damping, etc., and provides A Discrete Element Method Based Calculation and Simulation Method for Macrostructure Damping of Unbonded Granular Materials

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  • Discrete element method-based damping calculation simulation method for a macrostructure of a non-cohesive particle material
  • Discrete element method-based damping calculation simulation method for a macrostructure of a non-cohesive particle material
  • Discrete element method-based damping calculation simulation method for a macrostructure of a non-cohesive particle material

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Embodiment 1

[0028] Such as figure 1 As shown, a method for calculating and simulating macrostructure damping of non-bonded granular materials based on the discrete element method includes the following steps:

[0029] Step 1: Establish a virtual numerical test model, such as figure 1 As shown in (A), the non-cohesive granular material refers to any granular material and structure with elastic characteristics and non-cohesive properties. The particle size is within 30mm, and the internal structure of the material system is The squeezing effect of particles is mainly to form a skeleton structure, and the instability state is mainly caused by sliding friction between particles. The non-cohesive particle materials refer to but not limited to gravel and sand, which are established based on discrete element software PFC Virtual numerical test piece, the size of the test piece is not limited. Three fixed virtual walls are set on the bottom and left and right sides to simulate the test piece cont...

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Abstract

The invention discloses a discrete element method-based damping calculation simulation method for a macrostructure of a non-cohesive particle material. The method comprises the following steps of establishing a virtual numerical test model; Performing nano indentation and nano scratch test to obtain constitutive parameters; Calculating and monitoring damping dissipation energy and friction energyvalues; And calculating the damping evolution of the macrostructure of the non-bonded particle material based on the state accumulation mode of each calculation step. The method has the advantages that the method is used;, The method comprises the following steps of: accumulating states of calculation steps under discrete element software; the defect that continuous integration cannot be carried out under a discrete element method is broken through; secondly, the corresponding relation between dissipation energy of particles in the structure under the action of dynamic load and damping of thecorresponding structure in each period is established, a macroscopic damping accurate calculation method of the non-bonded particle group structure under the discrete system is provided on the basis,and important guarantee is provided for long-term performance estimation of the non-bonded particle material.

Description

Technical field [0001] The invention relates to a method for calculating and simulating macrostructure damping of non-bonded granular materials based on a discrete element method, and belongs to the technical field of road engineering. Background technique [0002] In road engineering, non-cohesive granular materials are widely used, such as graded gravel and sand. When non-cohesive granular materials are used in different road structure layers, it is necessary to ensure the stability of their structure. Non-cohesive granular materials are generally embedded and squeezed to form a strong skeleton structure. When subjected to external loads, their Plasticity, permanent deformation, and failure forms are mainly caused by the change of the particle's compaction state and the continuous sliding of the particles. Under dynamic load, the macroscopic modulus and stiffness of the structure composed of the particle system cannot directly and accurately characterize the internal particle ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 马涛丁珣昊顾临皓徐光霁吴少鹏肖月
Owner SOUTHEAST UNIV
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