Method for testing brittle material dynamic-shear fracture toughness and implementation device thereof

A shear fracture, brittle material technology, applied in the direction of using a stable shear force to test the material strength, etc., can solve the problems of crack initiation, unavoidable tensile stress components, and no pure shear fracture. The effect of accurate testing

Inactive Publication Date: 2014-09-17
SICHUAN UNIV
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  • Description
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Problems solved by technology

At the same time, there is an important problem in the above-mentioned shear fracture test, that is, the geometric configuration of the sample and the corresponding experimental loading conditions are difficult to avoid the additional tensile stress component at the crack tip in the test. Shear fracture, the result is that the crack deviates from the original crack surface and expands

Method used

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  • Method for testing brittle material dynamic-shear fracture toughness and implementation device thereof
  • Method for testing brittle material dynamic-shear fracture toughness and implementation device thereof
  • Method for testing brittle material dynamic-shear fracture toughness and implementation device thereof

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Embodiment 1

[0028] The indoor dynamic shear fracture toughness testing experimental device of this embodiment has a structure as attached figure 1As shown, its composition mainly includes the impact bomb launching device 1, the incident rod 4, the corrugated shaping sheet 3 arranged at the front end of the incident rod, the transmission rod 5, the strain gauge 7 attached to the incident rod and the transmission rod, and the holding cylinder Type sample installation device, confining pressure chamber 8, and data acquisition and processing system 11, the rear end of the incident rod is located in the confining pressure chamber, the front end of the incident rod passes through the front end of the confining pressure chamber and corresponds to the launch bore of the impact bomb launcher, and the transmission rod The front end passes through the back end of the confining pressure chamber and extends into the confining pressure chamber and is set opposite to the rear end of the incident rod to f...

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Abstract

The invention discloses a method for testing brittle material dynamic-shear fracture toughness and an implementation device thereof. The method comprises the following steps of installing a cylindrical sample with annular precracks on a Hopkins pressure lever dynamic experiment device, applying a dynamic shear force for two ends of the cylindrical sample with the annular precracks arranged between an incident bar and a transmission bar by impacting the incident bar by an impact pellet, and calculating dynamic-shear fracture toughness KIIC of the brittle material and a corresponding loading rate by a strain value, incident bar and transmission bar cross sectional areas, pressure lever elasticity modulus and sample confining pressure value according to a formula provided by the invention. The method can acquire dynamic-shear fracture toughness of a quasi-brittle material and fills in gap of the research field.

Description

technical field [0001] The invention belongs to the field of performance testing of brittle materials, and in particular relates to a method for testing the dynamic shear fracture toughness of brittle materials by using a cylindrical sample designed with prefabricated cracks and an implementing device thereof. technical background [0002] The shear fracture toughness of brittle materials such as rock and concrete is a very important mechanical property of brittle materials. According to the documents retrieved by the inventor, the current measurement of the shear fracture toughness of brittle materials such as rocks and concrete is mostly performed on a material testing machine under static or quasi-static conditions. Tensile shear samples, etc. At the same time, there is an important problem in the above-mentioned shear fracture test, that is, the geometric configuration of the sample and the corresponding experimental loading conditions are difficult to avoid the additio...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 戴峰徐奴文魏明东李彪许媛马悦
Owner SICHUAN UNIV
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