A Method for Identifying Kinetic Chain of Granular System

Abstract

The invention belongs to the technical field of granular system power transmission chain identification, and relates to a method for identifying a granular system power transmission chain. The method includes the steps that firstly, a granular system is loaded, and granular system images before and after deformation are collected to be used as an original image and a target image respectively; then, the original image and the target image are analyzed, and after a displacement field and a strain field in the granular system surface of the target image at the corresponding moment are obtained, the stress of each point is obtained according to the strain of each point in the strain field; afterwards, image edge detection is conducted on the target image, granular centroids are identified, the coordinates of the granular centroids and the position coordinates of contact points of all granules are read, a force equilibrium and torque equilibrium equation is established for each granule, and the size and orientation of contact force at different contact points on all the granules are acquired through calculation; at last, the contact force of each granule is drawn, and the graph which is continuously represented by the contact force between adjacent granules is the path of the power transmission chain. The method is simple, scientific in principle, convenient and flexible to use, high in practicability, large in development prospect and wide in applied range.

Description

Technical field: [0001] The invention belongs to the technical field of particle system force chain identification, and relates to a method for particle system power chain identification, which calculates macroscopic physical quantities such as particle force and displacement in real time, and realizes the identification and extraction of the particle system power chain. Background technique: [0002] As a complex system formed by the interaction of a large number of discrete particles, granular matter is ubiquitous in nature, daily life, and production. Its mechanical properties are between solids and liquids, and are far more complex than ordinary solids and liquids. Solid mechanics, fluid mechanics theory or condensed matter physics knowledge to explain. In 2005, granular matter and turbulent flow were listed as one of the 100 scientific problems by Science. The research on the basic mechanics of granular matter has become the frontier of science in recent years, and it i...

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Problems solved by technology

However, the photoelastic experiment carried out at this stage is only a model experiment, and the real particles cannot be measured by the photoelastic method due to their different shapes, textured surfaces and opaque materials. Therefore, the results of the photoelastic experiment can only be real sand particles. The force model and constitutive relationship of soil particles provide a reference, which is not enough for most practical projects to be directly adopted, and has certain limitations

At the same time, there is no relevant report on the actual measurement method of the kinetic chain of the real particle system

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