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Method for testing tensile strength of fragile material

A technique of tensile strength, test method, applied in the direction of using stable tension/compression to test the strength of materials, special data processing applications, instruments, etc., can solve problems such as influence

Inactive Publication Date: 2005-06-01
喻勇
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

This method solves the influence of factors such as height-to-diameter ratio k and Poisson’s ratio μ on the stress distribution of the sample, and can adopt a strength theory that is more reasonable than Griffith’s strength theory, such as Mohr’s strength theory or Yu Maohong’s unified strength theory, etc. , the tensile strength of the material can be satisfactorily measured

Method used

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  • Method for testing tensile strength of fragile material
  • Method for testing tensile strength of fragile material
  • Method for testing tensile strength of fragile material

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Embodiment Construction

[0037] The specific implementation of the present invention will be described below by taking the Mohr intensity theory as an example.

[0038] If you want to test the tensile strength of a brittle material, you need to know the uniaxial compressive strength σ of this material in advance C and Poisson's ratio μ. These two parameters can be obtained by existing test methods.

[0039] On the cross-section of the platform sample, the angle between the two ends of the platform and the line connecting the center of the section is called the central angle. Select a platform sample with a central angle of 30 degrees, the sample diameter may be 50mm, and the sample height-to-diameter ratio ranges from 0.1 to 1.0. Place the sample on the press, force the upper and lower platforms of the sample, and load the sample to destroy it. Observe the crack initiation point of the first failure in the sample. If the crack initiation point is on the compression center line of the end face of th...

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Abstract

The present invention is platform Brazil sample test method of measuring the tensile strength of fragile material. By means of 3D elastic mechanical number analysis, the stress distribution regulation of the fragile material in different height / diameter ratio and different Poisson's ratio conditions may be obtained. Proper fragile material strength theory is selected and the cracking initiating from the end surface center line of the sample is stipulated as the effective damage, so as to obtain tensile strength calculation formulas for the test under different height / diameter ratio and different Poisson's ratio conditions. Based on the tensile strength calculation formulas, the material tensile strength based on the strength theory may be obtained through measuring the sample sizes, Poisson's ratio, damage load and compression strength.

Description

technical field [0001] The invention relates to a method for testing the tensile strength of brittle materials, that is, a method for testing the tensile strength of brittle materials by using a Brazilian disc sample with a platform. Background technique [0002] As a basic mechanical parameter of materials, tensile strength plays an irreplaceable role in scientific research and production practice. People have always attached great importance to the research on the testing method of tensile strength of materials. However, due to the obvious brittle characteristics of brittle materials (such as rocks and concrete), it is very difficult to directly measure their tensile strength. People generally use indirect methods to test the tensile strength of brittle materials, and the most commonly used method is Disc Brazilian test method (hereinafter referred to as the Brazilian test). [0003] The Brazilian test is to radially load the disk sample. The load of the testing machine a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G06F19/00
Inventor 喻勇
Owner 喻勇
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