Test piece for testing rock II-type dynamic fracture toughness and testing method

A fracture toughness and specimen technology, which is applied in the field of rock type II dynamic fracture toughness test and specimen field of rock type II dynamic fracture toughness test, can solve problems such as complex structure, achieve simple loading operation and low processing difficulty , to avoid the effect of secondary fracture

Inactive Publication Date: 2017-02-15
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the technical status quo of existing rock type II dynamic fracture toughness test specimens with complex structures, auxiliary devices with complex structures to apply confining pressure and complicated test operations when testing rock type II dynamic fracture toughness, the present invention aims to provide Specimen for rock type II dynamic fracture toughness test and rock type II dynamic fracture toughness test method to simplify the structure of rock type II dynamic fracture toughness test specimen and rock type II dynamic fracture toughness test method

Method used

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  • Test piece for testing rock II-type dynamic fracture toughness and testing method
  • Test piece for testing rock II-type dynamic fracture toughness and testing method
  • Test piece for testing rock II-type dynamic fracture toughness and testing method

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Embodiment 1

[0045] In the present embodiment, the structural schematic diagram of the specimen used for rock type II dynamic fracture toughness test is as follows figure 1 As shown, the test piece is made by cutting the cylindrical core drilled on the construction site through a diamond slicer.

[0046] The test piece used for rock type II dynamic fracture toughness test, the test piece includes a disc-shaped test piece body 1, the radius R=25mm, thickness B=20mm of the disc-shaped test piece body, two Two slots 3, two rectangular mounting planes 2 with the same shape and size are processed on the disc-shaped test piece body 1, the two mounting planes are formed by removing part of the disc-shaped test piece body, perpendicular to the disc-shaped test piece body The same diameter and through the upper and lower disc surfaces of the test piece body, the ratio of the width H of the installation plane to the radius R of the disc-shaped test piece body is 0.35, the central angle β correspondi...

Embodiment 2

[0048] In the present embodiment, the structural schematic diagram of the specimen used for rock type II dynamic fracture toughness test is as follows figure 1 As shown, the test piece is made by cutting the cylindrical core drilled on the construction site through a diamond slicer.

[0049] The test piece used for rock type II dynamic fracture toughness test, the test piece includes a disc-shaped test piece body 1, the radius R=50mm, thickness B=30mm of the disc-shaped test piece body, two Two slots 3, two rectangular mounting planes 2 with the same shape and size are processed on the disc-shaped test piece body 1, the two mounting planes are formed by removing part of the disc-shaped test piece body, perpendicular to the disc-shaped test piece body The same diameter and through the upper and lower disc surfaces of the test piece body, the ratio of the width H of the installation plane to the radius R of the disc-shaped test piece body is 0.52, that is, the width H of the ins...

Embodiment 3

[0051] In the present embodiment, the structural schematic diagram of the specimen used for rock type II dynamic fracture toughness test is as follows figure 1 As shown, the test piece is made by cutting the cylindrical core drilled on the construction site through a diamond slicer.

[0052] The test piece used for rock type II dynamic fracture toughness test, the test piece includes a disc-shaped test piece body 1, the radius R=25mm, thickness B=25mm of the disc-shaped test piece body, two Two slots 3, two rectangular mounting planes 2 with the same shape and size are processed on the disc-shaped test piece body 1, the two mounting planes are formed by removing part of the disc-shaped test piece body, perpendicular to the disc-shaped test piece body The same diameter and through the upper and lower disc surfaces of the test piece body, the ratio of the width H of the installation plane to the radius R of the disc-shaped test piece body is 0.4, that is, the width H of the inst...

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Abstract

The invention discloses a test piece for testing rock II-type dynamic fracture toughness and a testing method. The test piece is a disc-shaped test piece with two cutting grooves, two rectangular mounting planes identical in shape and size and perpendicular to a diameter are processed at positions, symmetric according to a same diameter, of a test piece body, the cutting grooves which are identical in shape and size are positioned on a same diameter of the test piece body, cutting groove faces are along side face thickness direction and diameter direction of the test piece, and openings of the cutting grooves extend into the test piece and penetrate upper and lower disc plate faces of the test piece. The testing method includes: mounting the test piece between an incidence rod and a transmission rod of a Hopkinson press rod testing device; utilizing an impact rod to impact the front end face of the incidence rod, wherein generated stress waves are shaped by a waveform shaping piece arranged on the front end face of the incidence rod and then act on the test piece through the incidence rod; collecting incidence strain, reflection strain and transmission strain in the whole process from impact starting to failing of the test piece by strain pieces arranged on the incidence rod and the transmission rod, and calculating to acquire rock II-type dynamic fracture toughness.

Description

technical field [0001] The invention belongs to the field of rock mechanics and engineering, in particular to a test piece for testing rock type II dynamic fracture toughness and a method for testing rock type II dynamic fracture toughness. Background technique [0002] Water conservancy, transportation, petroleum, mining and other engineering fields all involve the fracture of rock materials. In order to ensure the safety and stability of engineering structures, it is necessary to prevent fractures from occurring, and in blasting excavation, tunneling, and oil and gas exploitation, it is necessary to use fracture phenomena to improve rock breaking efficiency. Fracture toughness, as a mechanical parameter that characterizes the ability of materials to resist crack growth, is of great value in both engineering applications and theoretical research. According to the different loads on the crack body, the fracture can be divided into three basic modes: type I, type II and type...

Claims

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Application Information

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IPC IPC(8): G01N3/30G01N1/28
CPCG01N1/28G01N3/30
Inventor 戴峰魏明东徐奴文许媛刘燚赵涛
Owner SICHUAN UNIV
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