Split type three-dimensional pressure device and strain waveform pattern collecting method

A three-dimensional pressure, split-type technology, applied in the direction of measuring devices, using stable tension/pressure to test the strength of materials, analyzing materials, etc., can solve the problems of unable to test the mechanical properties of materials and unable to preload the specimen in three axes, etc., to achieve Novel and unique structure, good effect and easy to use

Pending Publication Date: 2019-08-02
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional SHPB (Hopkinson pressure bar test) device cannot perform triaxial preloading on specimens, let alone conduct material mechanical performance tests on materials such as rocks under coupled dynamic and static loads. Therefore, its improvement and innovation potential must do

Method used

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  • Split type three-dimensional pressure device and strain waveform pattern collecting method
  • Split type three-dimensional pressure device and strain waveform pattern collecting method
  • Split type three-dimensional pressure device and strain waveform pattern collecting method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0072] Example 1: The impact test is carried out on a mortar simulation material with a compressive strength of 9MPa. The relevant parameters are as follows, and the original waveform is as follows Figure 5 As shown, the stress-strain curve is shown in Figure 6 Shown:

[0073] Table 1 calculation results

[0074]

example 2

[0075] Example 2: The impact test is carried out on a mortar simulation material with a compressive strength of 6MPa. The relevant parameters are as follows, and the original waveform is as follows Figure 7 As shown, the stress-strain curve is shown in Figure 8 Shown:

[0076] Table 2 calculation results

[0077]

example 3

[0078] Example 3: The impact test is carried out on a mortar simulation material with a compressive strength of 4MPa. The relevant parameters are as follows, and the original waveform is as follows Figure 9 As shown, the stress-strain curve is shown in Figure 10 Shown:

[0079] Table 3 calculation results

[0080]

[0081] From the above experiments, it can be seen that due to the combined loading of axial static pressure and confining pressure on the specimen, it can be seen from the original waveform diagram collected that the incident wave has a straight section, and constant strain rate loading is achieved. Under the action of axial pressure and confining pressure, the dynamic compressive strength of the specimen is improved, and due to the existence of confining pressure, the strain increases first and then decreases at the end of loading. The combined loading experimental device modified from the traditional SHPB device The same as the one-dimensional stress wave ...

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Abstract

The invention relates to a split type three-dimensional pressure device and a strain waveform pattern collecting method. The device comprises a base, a pressure chamber and an oil cylinder, wherein the pressure chamber and the oil cylinder are fixed on the base. A first sliding cushion block and a second sliding cushion block are arranged at the two ends of the pressure chamber respectively and are connected to the inner cavity in a sliding manner to seal the two ports. The oil cylinder includes a cylinder body and a piston arranged at the center of the cylinder body in a sliding manner; a sensor connecting plate is fixedly connected to one end, being close to the pressure chamber, of the piston; and a force sensor is arranged at one side, away from the oil cylinder, of the sensor connecting plate. Under the combined effect of the impact dynamic load and the three-axis static load, combined loading of the axial static pressure and the confining pressure is realized based on dynamic load applying to the roc sample. Confining pressure preloading is carried out by the pressure chamber and axial pressure preloading is carried out through the oil cylinder, so that preloading of the three-axis force is carried out on the test piece; and thus the condition of testing of mechanical properties of the material under dynamic and static load coupling loading of rock and other materials ismet.

Description

technical field [0001] The invention relates to a split-type three-dimensional pressure device, which can cooperate with a Hopkinson compression bar to conduct a material mechanical performance test on materials such as rocks under the action of dynamic and static load coupling loading. Background technique [0002] In natural and engineering rock masses, a considerable part of the rocks are often in a certain state of in-situ stress before the action of dynamic loads. In underground rock mass engineering, the ground stress cannot be ignored, and basically increases with the increase of depth. A large number of blasting engineering practices and theoretical studies have shown that the initial ground stress has an important impact on ground shock propagation, rock mass destruction and blasting effect. The Hopkinson compression bar technology was proposed by J.Hopkinson and B.Hopkinson in 1949. On this basis, Kolsky proposed a separate Hopkinson compression bar for measuring ...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N3/313G01N3/06
CPCG01N3/12G01N3/313G01N3/068G01N3/066G01N3/06G01N2203/0026G01N2203/0048G01N2203/0075G01N2203/0256
Inventor 余永强龚健范利丹张白梅张文龙杨蒙孙亮周鑫
Owner HENAN POLYTECHNIC UNIV
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