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Normal contact force testing method of spherical particle system under impact action

A technology of spherical particles and impact action, applied in the direction of force/torque/work measuring instruments, measuring devices, measuring force components, etc., can solve the problems of particle material breaking, experiment failure, and no quantitative control of impact load, etc., to achieve accuracy High, simple operation method, and the effect of improving accuracy

Active Publication Date: 2018-09-14
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Often in such methods, they do not have quantitative control over the magnitude of the impact load applied, resulting in fragmentation of the particulate material and failure of the experiment
On the other hand, many experimental methods only measure the contact force between granular materials, and do not study the dissipation law of the contact force between particles in depth, so their experimental conclusions are not perfect

Method used

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  • Normal contact force testing method of spherical particle system under impact action
  • Normal contact force testing method of spherical particle system under impact action
  • Normal contact force testing method of spherical particle system under impact action

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1, the device that the present application adopts is: comprise impact force hammer 12, force hammer pressure sensor 13, signal converter 11, dynamic signal test analysis device 10, experiment ball 1, film pressure sensor 2, plexiglass circular tube 3, Wire 4, support plate 5, connecting screw 6, fixing sleeve 7, data acquisition and processing circuit box 8 and computer 9.

[0046] The fixing sleeve is installed on the support plate through the connecting screw, one end of the plexiglass tube is installed on the support plate through the fixing sleeve, and the experimental ball is placed in the plexiglass tube. On a straight line, the thin-film pressure sensor is placed between the experimental ball and the experimental ball. The thin-film pressure sensor is connected to the data acquisition and processing circuit box through a wire, and the data acquisition and processing circuit box is connected to the computer; the impact hammer is used to apply the impact ...

Embodiment 2

[0059] The pressurizing mechanism includes a gas supply bottle, a gas storage chamber, a fixed bracket, a loading plate and a piston; the gas supply bottle, the gas storage chamber and the loading plate are connected in sequence through a gas pipeline; the gas supply bottle is provided with a barometer and a gas valve switch; The gas supply bottle is connected to the gas storage chamber through the gas transmission pipe, and the gas storage chamber is equipped with a control switch and a pressure gauge; the gas storage chamber acts on the loading plate through the gas transmission pipe, and one end of the fixed bracket is sealed with a seamless steel pipe; the loading plate is connected On the other end of the fixed bracket; the piston is located below the loading plate and at the upper end of the plexiglass tube; the side of the loading plate in contact with the piston is provided with an impact sensor; the outer diameter of the piston is consistent with the inner diameter of t...

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Abstract

The invention relates to the field of measurement tests of a normal contact force of a particle system under an impact force and in particular relates to a normal contact force testing method of a spherical particle system under an impact effect. The normal contact force testing method comprises the following steps: vertically stacking a plurality of experiment balls in an organic glass round pipe; sticking a thin film pressure sensor capable of detecting pressure on a contact surface between the experiment balls; applying an impact load on the experiment ball at the top by adopting a pressurizing mechanism, and recording the impact load applied by the pressurizing mechanism through a force hammer sensor; recording the size of the contact force between the experiment balls through the thinfilm pressure sensor and a data acquisition and processing circuit box; applying the different impact loads and repeating testing steps. The normal contact force testing method provided by the invention can be used for quantitatively controlling the size of the impact load so that a relatively reasonable force application range is determined; a dissipation rule of the normal contact force betweenthe balls also can be researched through a time-history curve of applying the load through a force hammer, and a time-history curve of the normal contact force between the balls.

Description

technical field [0001] The invention relates to the field of measurement tests for finding contact force when a particle system is impacted, in particular to a method for testing normal contact force of a spherical particle system under impact. Background technique [0002] In the field of civil engineering, the essential composition of rock mass or soil is mainly composed of bulk materials. Since the contact process of bulk material particles is not a simple mechanical process, the relevant experimental methods and theoretical systems have not yet been formed. But it is also a hot topic of research by relevant experts at home and abroad. [0003] As an irreplaceable numerical simulation method for the study of bulk particles, the discrete element method focuses on the study of the motion mechanism of the bulk particles, and the experimental research on the contact force of the bulk particles is helpful to further grasp the motion mechanism of the bulk particles. A large nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00G01L5/16G01L5/00
CPCG01L5/0052G01L5/16G01N15/00
Inventor 单鹏刘军程毅刘明清刘光昆赵伏田肖治民蓝鹏张超金胜兵
Owner HOHAI UNIV
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