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Test piece component and test method of brittle material I-III mixed mode fracture toughness test

A fracture toughness, brittle material technology, applied in the direction of using stable shear force to test material strength, using stable tension/pressure to test material strength, analyzing materials, etc., can solve problems such as difficulty in application, and achieve easy Simple processing, loading method and testing process, simple structure

Inactive Publication Date: 2017-03-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the difficulty in applying the existing I-III composite load, the need to use a complex structure of the test piece and the use of a complex structure of the loading device, and the technical status quo of the complex fracture toughness test operation of the brittle material I-III composite type, the present invention aims to In order to effectively simplify the test operation of brittle materials I-III composite fracture toughness by providing specimen components and test methods for brittle materials I-III composite fracture toughness test

Method used

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  • Test piece component and test method of brittle material I-III mixed mode fracture toughness test

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Embodiment 1

[0038] In the present embodiment, the structural representation of the specimen assembly used for the composite fracture toughness test of brittle materials I-III is as follows Figure 1~3 As shown, the body of the test piece is made by cutting a concrete block with a diamond slicer.

[0039] The specimen assembly for the composite fracture toughness test of brittle materials I-III consists of a specimen body 1 with a notch 2 and columns for supporting the compression specimen body, and the specimen body is a square flat plate The plate on the surface, the thickness of the plate is B=25mm, the side length of the plate surface is L=100mm, the groove passes through the center of the plate surface of the specimen body and the groove surface of the groove is parallel to the left and right sides of the specimen body, and the groove runs through the specimen On the front and rear sides of the body, the depth a of the groove is a=10mm, and the width of the groove is 1mm; the columns ...

Embodiment 2

[0041] In the present embodiment, the structural representation of the specimen assembly used for the composite fracture toughness test of brittle materials I-III is as follows Figure 1~3 As shown, the body of the specimen is made of rock blocks cut by a diamond slicer.

[0042] The specimen assembly for the composite fracture toughness test of brittle materials I-III consists of a specimen body 1 with a notch 2 and columns for supporting the compression specimen body, and the specimen body is a square flat plate The plate on the surface, the thickness of the plate is B=75mm, the side length of the plate surface is L=150mm, the groove passes through the center of the plate surface of the specimen body and the groove surface of the groove is parallel to the left and right sides of the specimen body, and the groove runs through the specimen On the front and rear sides of the body, the depth of the groove is a=45mm, and the width of the groove is 1mm; the columns include two sup...

Embodiment 3

[0044] In the present embodiment, the structural schematic diagram of the specimen assembly for brittle material I-III composite fracture toughness test is similar to Figure 1~3 , the body of the specimen is made of rock blocks cut by a diamond slicer.

[0045] The specimen assembly for the composite fracture toughness test of brittle materials I-III consists of a specimen body 1 with a notch 2 and columns for supporting the compression specimen body, and the specimen body is a square flat plate The plate on the surface, the thickness of the plate is B=40mm, and the side length of the plate surface is L=200mm. On the front and rear sides of the body, the depth of the groove is a=12mm, and the width of the groove is 0.8mm; the columns include two supporting columns 3 between the plate surface where the groove of the test piece body is located and the working platform of the universal testing machine and a pressing column 4 located between the other side of the test piece body...

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Abstract

The invention discloses a test piece component and a test method of a brittle material I-III mixed mode fracture toughness test. The test component comprises a test piece body with a grooving and column bars for supporting and pressing the test piece body, the test piece body is a plate with square and flat surfaces, the grooving passes through the center of the test piece body plate surface, the groove surface of the grooving is parallel to the left and right side surface of the test piece body, and the grooving penetrates the front and back side of the test piece body; the column bars comprise two supporting column bars which are between the plate surface where the test piece body grooving is positioned and a universal testing machine workbench as well as a pressing column bar which is positioned between the other side plate surface of the test piece body and a universal testing machine work head, the supporting column bars and the pressing column bar are column bars with the same structure, and at least one side of each column bar is a straight arc column surface, wherein the surface and the test piece body plate surface form a line contact. During test, the universal testing machine carries out loading by the pressing column bar and the supporting column bars for the test piece body in a displacement control mode till the test piece is failure.

Description

technical field [0001] The invention belongs to the field of engineering material mechanics, and in particular relates to a test piece assembly and a test method for testing the fracture toughness of brittle materials I-III composite. Background technique [0002] Civil, petroleum, mining, water conservancy, transportation and other engineering fields all involve the fracture of brittle materials such as concrete or rock. In oil and gas mining, tunneling, and blasting excavation, it is necessary to use the fracture phenomenon and try to improve the efficiency of rock breaking. In order to ensure the safety and stability of the engineering structure, it is necessary to prevent the occurrence of fractures. 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. [0003] In fracture mechanics, according to the different loading modes of the cra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/24
CPCG01N3/08G01N3/24G01N2203/0026G01N2203/0067
Inventor 戴峰魏明东徐奴文刘燚许媛赵涛
Owner SICHUAN UNIV
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