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A contact stress visual test loading device for granular materials and using method thereof

A technology of contact stress and loading equipment, which is applied in the direction of analyzing materials, testing material strength by applying stable shear force, testing material strength by applying stable tension/pressure, etc. Problems such as heterosexuality and contact stress cannot be directly tested and observed

Active Publication Date: 2021-08-13
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the deformation and strength analysis methods of granular materials are evaluated by observing the strain of granular materials, while the research on the complex stress of granular materials is only obtained through the conversion of the granular constitutive relationship, but this conversion method ignores the granular material Inhomogeneity and anisotropy, especially the contact stress between particles cannot be directly observed experimentally, this advanced conversion method has caused great limitations to our research on the mechanics of granular materials

Method used

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  • A contact stress visual test loading device for granular materials and using method thereof
  • A contact stress visual test loading device for granular materials and using method thereof
  • A contact stress visual test loading device for granular materials and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The steps of pure shear horizontal loading mode are as follows:

[0060] (1) Make a granular sample 510 according to the size of the sample container, put the granular sample 510 into the experimental container, and fix it on the internal support device of the loading device 500, turn the cross knob 523, and insert the slideway pin 524 into the slideway 512 In the reserved hole, the horizontal baffle 505 cannot move up and down.

[0061] (2) Press the button 544, the horizontal baffle 505 and the vertical baffle 503 can rotate, and adjust the horizontal shear screw head 501 to adjust the sample container to a vertical state, press the button 544 again to make the button pop up, At this time, the horizontal baffle 505 and the vertical baffle 503 cannot rotate, and the horizontal shear screw head 501 is fixed to keep the vertical baffle 503 from being displaced during the axial loading process.

[0062] (3) Rotate the cross knob 523 to make the card pin 524 withdraw from...

Embodiment 2

[0065] The steps for pure shear loading are as follows:

[0066] (1) Make a particle sample 510 according to the size of the sample container, put the sample into the experimental container, and fix it on the internal support device of the loading device 500, turn the cross knob 523, and insert the slideway pin 524 into the pre-set position of the slideway 512. Stay in the hole so that the horizontal baffle 505 cannot move up and down.

[0067] (2) Press the button 544, the horizontal baffle 505 and the vertical baffle 503 can rotate, and adjust the horizontal shear screw head 501 so that the lateral horizontal shear screw head 501 lightly touches the stress-displacement sensor, from the side The reading at this time is zero to the stress displacement meter 502, ensuring that the sample container is adjusted to a vertical state at this time.

[0068] (3) Start loading from the reading zero, record the image state with the photoelastic experimental equipment every certain read...

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Abstract

The invention relates to the technical fields of photoelasticity and particle mechanics, and discloses a loading device for a granular material contact stress visualization test, which includes an independently working photoelastic experimental device and a loading device. The loading device includes a rectangular frame, and the middle part of the upper end of the rectangular frame passes through a vertical axis. A horizontal baffle is connected to the screw head, and a vertical baffle is connected to the middle of the front side of the rectangular frame through a horizontal shearing screw head; a method of using it is also disclosed, wherein the particle sample is loaded by a loading device, and the photoelastic test equipment is used to load the sample. The dynamic stress change of the granular sample is dynamically captured, and finally the image of the stress change is analyzed by the computer. In the present invention, through the three loading modes of the loading device, in-depth research on the contact stress state of the granular material can be made, and the photoelastic experimental equipment can provide the most intuitive image display for the stress distribution (force chain) of the granular material, and Computer software is used to analyze the image to obtain the stress distribution at each position.

Description

technical field [0001] The invention relates to the technical fields of photoelasticity and particle mechanics, in particular to a loading device for a granular material contact stress visualization test and a use method thereof. Background technique [0002] Granular material refers to small and round substances (Particle). The simplest particle shape is a sphere. Particles with a particle size of 40-500 μm and a gas-solid density difference of 1400-4000 kg / m3 are called coarse particles; particles with a particle size of 20-100 μm and a gas-solid density difference of less than 1400 kg / m3 It is called fine particle (Fine particle); the particle system composed of many particles with small particle size intervals is called particle swarm. [0003] At present, the deformation and strength analysis methods of granular materials are evaluated by observing the strain of granular materials, while the research on the complex stress of granular materials is only obtained through...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/02G01N3/08G01N3/24G01L5/00
CPCG01L5/00G01N3/02G01N3/08G01N3/24
Inventor 耿大新刘鑫磊胡文韬陶彪王俊廖煜祺孟成吴金亮魏日祥曹超超
Owner EAST CHINA JIAOTONG UNIVERSITY
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