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RA-AF-E rock material brittle failure crack classification method based on acoustic emission parameters

A technology of brittle fracture and brittle failure, which is applied in material analysis using acoustic wave emission technology, material analysis using sound wave/ultrasonic wave/infrasonic wave, material analysis, etc. question

Active Publication Date: 2020-10-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To sum up, the current acoustic emission parameter discrimination method does not have a clear k-value division method and the identified fracture types are not comprehensive

Method used

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  • RA-AF-E rock material brittle failure crack classification method based on acoustic emission parameters
  • RA-AF-E rock material brittle failure crack classification method based on acoustic emission parameters
  • RA-AF-E rock material brittle failure crack classification method based on acoustic emission parameters

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Effect test

Embodiment 1

[0041] A RA–AF–E classification method for brittle fracture cracks of rock materials based on acoustic emission parameters is used to classify the types of cracks in the failure process of rock materials in the direct shear test. The specific implementation steps are as follows:

[0042] Step 1: If Figure 4 As shown in , the direct shear test (150mm×150mm×150mm) was carried out on the rock-like specimens to obtain the acoustic emission data during the shear failure process of the rock-like specimens. The acoustic emission probes are randomly arranged, the acoustic emission threshold value is 45dB, the sampling frequency is 1MHz, the preamplifier gain is set to 40dB, the acoustic emission monitoring system is always synchronized in real time during the mechanical loading process, the acoustic emission parameters of the whole process are obtained, and the RA is calculated. , AF, E.

[0043] Step 2: Take RA as the x-axis, AF as the y-axis, and E as the z-axis, and express each ...

Embodiment 2

[0048] A RA-AF-E rock material brittle fracture crack classification method based on acoustic emission parameters is used to classify the crack types in the failure process of rock material three-point bending test specimens. The specific implementation steps are as follows:

[0049] Step 1: If Figure 8 , the bending test (150mm×150mm×150mm) was carried out on the rock mass gypsum specimen to obtain the acoustic emission data of the rock mass specimen during the bending and tensile failure process. The acoustic emission probes are randomly arranged, the acoustic emission threshold value is 45dB, the sampling frequency is 1MHz, the preamplifier gain is set to 40dB, the acoustic emission monitoring system is always synchronized in real time during the mechanical loading process, the acoustic emission parameters of the whole process are obtained, and the RA is calculated. , AF, E.

[0050] Step 2: Take RA as the x-axis, AF as the y-axis, and E as the z-axis, and express each po...

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Abstract

The invention discloses an RA-AF-E rock material brittle failure crack classification method based on acoustic emission parameters. The method comprises the following steps of step 1, taking an energyparameter of an acoustic emission positioning point as an intensity characteristic of a crack, and calculating an intensity value E of each rupture point position and a corresponding RA value and anAF value; 2, representing each point in a three-dimensional space taking RA-AF-E as a coordinate axis; 3, according to the energy characteristics of different fracture types and the corresponding acoustic emission data characteristics, the fracture point types being classified through a space plane; and 4, projecting the divided areas into an RA-AF plane, and establishing a more accurate crack type classification method. The method is simple and easy to implement, overcomes defects that an original method is unclear in fracture division, incomplete in fracture type division, multiple in influence factors and the like, is convenient to apply practically, and has high division precision; in addition, the fracture classification method is wide in application field and has important significance in revealing the stress fracture mechanism of brittle materials.

Description

technical field [0001] The invention belongs to the field of deep mine engineering rock mass mechanics and geotechnical engineering research, and specifically relates to an RA-AF-E rock material brittle fracture crack classification method based on acoustic emission parameters. Background technique [0002] The microfracture of brittle rock materials can be divided into tension cracks, shear cracks and tensile-shear composite cracks. However, regardless of the type of fracture, part of the energy stored in the rock will be released in the form of elastic stress waves during its formation process. This phenomenon is called acoustic emission (AE) of the rock. Previous studies have shown that different rupture behaviors correspond to different characteristics of acoustic emissions. Therefore, acoustic emission signals can be used to analyze the fracture tension-shear characteristics of the rock failure process, to study the crack propagation evolution process and law caused by...

Claims

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Application Information

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IPC IPC(8): G01N29/14G01N29/44
CPCG01N29/14G01N29/4409G01N29/4472
Inventor 夏元友刘夕奇王刚刘昌昊阎要锋吝曼卿
Owner WUHAN UNIV OF TECH