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A method for testing the tensile modulus of brittle materials

A technology of tensile modulus and brittle materials, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems that are not easy and the accuracy of the results is difficult to guarantee, and achieve the effect of overcoming errors

Inactive Publication Date: 2011-12-14
CENT SOUTH UNIV
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  • Description
  • Claims
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Problems solved by technology

However, how to ensure that the strain gauge is just attached to the center of the sample tension area and completely perpendicular to the tension direction during the strain gauge pasting process is not easy to do, so the accuracy of the obtained results is sometimes difficult to guarantee

Method used

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  • A method for testing the tensile modulus of brittle materials
  • A method for testing the tensile modulus of brittle materials
  • A method for testing the tensile modulus of brittle materials

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Embodiment 1

[0020] Before testing the tensile modulus of a material, it is necessary to measure the Poisson's ratio of the material, which can be obtained through a conventional uniaxial static pressure test. Then a cylindrical sample (such as a diameter of 50 mm) can be selected, and the ratio of the height to diameter (diameter) of the sample can be 1:1. Place the sample on the Brazilian splitting test machine (refer to the RMT150 series splitting loading system developed by the Wuhan Institute of Geotechnical Sciences, Chinese Academy of Sciences), and place displacement sensors at both ends of the central diameter of the sample in the vertical loading direction to measure the displacement. The specimen splits and fails. And record the failure load, the total transverse displacement of the sample when it is destroyed, and finally calculate the tensile modulus.

[0021] The specific process is as follows: (Brazil splitting test process refers to the national standard "Engineering Rock ...

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Abstract

The invention discloses a method for testing the tensile modulus of brittle materials, which is characterized in that the sample is placed on a Brazilian split testing machine, a linear load is applied to the sample symmetrically in the radial direction of the sample, and the sample is measured. The total displacement in the direction of the central diameter, the direction of the total displacement is perpendicular to the loading direction of the sample, and the tensile modulus Et of the material is calculated according to the following formula: where Et is the tensile modulus, σt is the Brazilian splitting resistance Tensile strength, where Pt is the linear load, L is the length of the sample, D is the diameter of the sample, μ is Poisson's ratio, and Δut is the total displacement in the direction of the center diameter of the sample. The method for testing the tensile modulus of brittle materials of the invention can ensure more accurate test results.

Description

technical field [0001] The invention relates to a method for testing the tensile modulus of brittle materials. technical background [0002] The tensile properties (including tensile strength, tensile modulus, etc.) of brittle materials such as rocks and concrete are very important properties. The methods currently used to determine the tensile parameters of brittle materials mainly include direct tensile test and indirect tensile test. Due to the difficulty in processing the samples for the direct tensile test, the indirect tensile test method is usually used for the tensile test. The Brazilian split test is currently the most commonly used indirect tensile test method. This method was recommended by the International Society for Rock Mechanics (ISRM) in 1978 as a method for determining the tensile strength of rock. This method is also one of the standard methods developed by the American Society for Testing and Materials. In China, the national standard "Engineering Ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
Inventor 宫凤强李夕兵
Owner CENT SOUTH UNIV
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