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Test piece assembly for testing rock I-II compound dynamic fracture toughness and testing method

A fracture toughness and composite technology, applied in the field of rock mechanics and engineering, can solve the problems of complex preparation process, lack of maturity and feasibility, and achieve the effect of low processing difficulty, flexible method, and easy test accuracy.

Inactive Publication Date: 2017-07-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the complex preparation process of the existing rock I-II composite fracture toughness test specimens and the technical status quo of no mature and feasible rock I-II composite fracture toughness test method, the present invention aims to provide a method for rock Specimen components and test methods for I-II composite dynamic fracture toughness test, to simplify the preparation process of rock I-II composite dynamic fracture toughness test specimen and rock I-II composite dynamic fracture toughness test method

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  • Test piece assembly for testing rock I-II compound dynamic fracture toughness and testing method
  • Test piece assembly for testing rock I-II compound dynamic fracture toughness and testing method

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Embodiment 1

[0046] In the present embodiment, the structure of the specimen assembly for rock I-II composite dynamic fracture toughness test is as follows Picture 1-1 , Figure 1-2 and figure 2 As shown, the specimen is cut by a diamond slicer from a granite cylindrical core drilled on the rock engineering site.

[0047] The specimen assembly for the rock I-II compound dynamic fracture toughness test consists of a specimen body 1 with a notch 2 and a loading platform 3 and an indenter 4 against the specimen body, and the specimen body is Semi-disc-shaped plate, the radius R of the specimen body is R=25mm, and the thickness B=20mm. The cut groove 2 on the specimen body extends from the straight side plane of the semi-disc specimen along the axisymmetric plane of the semi-disc specimen to the inside of the specimen. And run through the two semicircular surfaces of the test piece body, the depth of the groove is a=7.5mm, and the width of the groove is t=0.8mm. The loading platform 3 on t...

Embodiment 2

[0049] In the present embodiment, the structure of the specimen assembly for rock I-II composite dynamic fracture toughness test is as follows Picture 1-1 , Figure 1-2 and figure 2 As shown in Fig. 1, the specimen is processed by machine tools from sandstone cylindrical cores drilled in the rock engineering field.

[0050] The specimen assembly for the rock I-II compound dynamic fracture toughness test consists of a specimen body 1 with a notch 2 and a loading platform 3 and an indenter 4 against the specimen body, and the specimen body is Semi-disc-shaped plate, the radius R of the specimen body is R=37.5mm, the thickness B=30mm, and the cut groove 2 on the specimen body faces the inside of the specimen symmetrically from the plane of the straight side of the semi-disc specimen along the axis of the semi-disc specimen Extending and penetrating through the two semicircular surfaces of the test piece body, the depth of the groove is a=15mm, and the width of the groove is t=...

Embodiment 3

[0052] In the present embodiment, the structure of the specimen assembly for rock I-II composite dynamic fracture toughness test is as follows Picture 1-1 , Figure 1-2 and figure 2 As shown, the specimen is made of a marble cylindrical core drilled on the rock engineering site and processed by a diamond slicer.

[0053] The specimen assembly for the rock I-II compound dynamic fracture toughness test consists of a specimen body 1 with a notch 2 and a loading platform 3 and an indenter 4 against the specimen body, and the specimen body is Semi-disc-shaped plate, the radius R of the test piece body is R=50mm, the thickness B=40mm, and the cut groove 2 on the test piece body extends from the straight side plane of the half-disk test piece along the axisymmetric face of the half-disc test piece to the interior of the test piece And run through the two semicircular surfaces of the test piece body, the depth of the groove a = 15mm, the width of the groove t = 1mm. The loading pl...

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Abstract

The invention discloses a test piece assembly for testing rock I-II compound dynamic fracture toughness and a testing method. The test piece assembly comprises a test piece body with a groove and a loading platform, and cylindrical pressing heads supporting and abutting against the test piece body. The test piece body is a semi-disc-shaped plate, the groove stretches into a test piece from the straight side plane of the semi-disc-shaped test piece along the axial symmetry surface of the semi-disc-shaped test piece, the loading platform is located in the center of the arc surface of the semi-disc-shaped test piece, and the table plane is parallel to the straight side plane of the test piece. The pressing heads are straight arc cylindrical surface pressing heads. During testing, the two cylindrical pressing heads are located on the two sides of the groove respectively, the test piece assembly is arranged between an incidence rod and a transmission rod of a Hopkinson pressure bar testing device, the test piece is collided through an impact bar of the testing device, and the I-II compound dynamic fracture toughness of the rock test piece is tested through strain signals. The preparation process of the rock I-II compound dynamic fracture toughness testing test piece and the testing process of the rock I-II compound dynamic fracture toughness are greatly simplified.

Description

technical field [0001] The invention belongs to the field of rock mechanics and engineering, and in particular relates to a test piece assembly for testing rock I-II composite dynamic fracture toughness and a method for testing rock I-II composite dynamic fracture toughness. Background technique [0002] Rock fracture toughness is an important parameter in rock fracture mechanics to characterize the ability of rock materials to resist crack propagation. According to the different loads on fractured rocks, the fracture toughness of rocks can be subdivided into three basic categories: Type I (opening type), Type II (sliding type) and Type III (tearing type). In engineering, the probability of pure type I, pure type II or pure type III fractures in rocks is extremely small, and the real fracture mode is often I-II composite type. Therefore, rock I-II composite fracture toughness has become an indispensable material parameter in the theoretical research and engineering applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N3/02G01N3/307
Inventor 戴峰魏明东刘燚徐奴文赵涛许媛
Owner SICHUAN UNIV
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