Method for assessing elastic modulus and strength of circular or circular-tube brittle material

A technology for brittle materials and elastic modulus, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve the problems that the existing measurement methods cannot be used for the testing of elastic modulus and strength and other material properties, and have not been found. , to achieve quick evaluation, simple operation, saving test funds and time

Active Publication Date: 2011-06-15
中国国检测试控股集团海南有限公司
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  • Application Information

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Problems solved by technology

For round tubes or ring-shaped brittle materials that cannot be processed into standard samples, such as tubes or rings with a wall thickness of less than 3mm, they cannot meet the requirements of the existing st

Method used

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  • Method for assessing elastic modulus and strength of circular or circular-tube brittle material
  • Method for assessing elastic modulus and strength of circular or circular-tube brittle material
  • Method for assessing elastic modulus and strength of circular or circular-tube brittle material

Examples

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Embodiment 1

[0055] Embodiment 1: Measuring the elastic modulus and strength of the glass circular tube at room temperature

[0056] The specific operation process is:

[0057] 1) Select a glass circular tube with an inner diameter of 15.70mm (inner radius r is 7.85mm) and an outer diameter of 17.74mm (outer radius R is 8.87mm) as the research object, and cut it into a circle with a width of 3.94mm Ring, grind and polish the side of the ring, and then use a diamond blade to cut a gap of about 2mm to form a gap ring glass sample;

[0058] 2) Fix the notched ring glass sample on the support table of the universal testing machine, and the notch is located at half of the height direction of the sample;

[0059] 3) Load the notched ring sample at a speed of 0.5 mm / min until the sample breaks, and use an inductance meter to record the compression amount Δδ of the sample in the direction of force application. Record that the critical load corresponding to the fracture of the sample is 6.76N, th...

Embodiment 2

[0062] Embodiment 2: measure aluminum oxide (Al 2 o 3 ) Elastic modulus and strength of ceramic tubes in different temperature ranges

[0063] The specific operation process is:

[0064] 1) When measuring the elastic modulus and strength at high temperature, the upper indenter and the supporting platform are both made of SiC. The upper indenter of the compression device is directly in contact with the sample support platform, which is used to calibrate the measurement error of the compression amount introduced by the fixture of the testing machine during the loading process. In this experiment, reach the test temperature and keep it warm for a period of time (generally 15 minutes) to keep the internal and external temperature of the sample consistent. Apply a load to 500N. The maximum load value can also be adjusted appropriately according to the load capacity of the test sample and the fixture. The loading rate is 0.5mm / min, record the load-displacement curve at this temp...

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Abstract

The invention provides a method for testing elastic modulus and breaking strength of a circular or circular-tube brittle material, which comprises the steps of: first machining a pipe or circular material sample to be tested into a notch ring sample, wherein the notch is positioned at the middle part of the sample in the height direction; applying a compression load to the notch ring sample, and calculating the elastic modulus of the material in online linear elastic range according to the obtained load increment, the corresponding compression displacement increment and the size of the sample; and applying the compression load to the sample till the sample is broken, and calculating the strength of the sample according to the critical load and the size of the sample. The method does not need a specific clamp, is not limited by the test environment and condition, can be used for tests in special environments of low temperature, high temperature, ultrahigh temperature, vacuum, toxic andharmful medium and the like in which conventional tests cannot be implemented, solves the problem of difficult machining of samples for testing elastic modulus and strength of pipe-shaped and circular parts, and has important actual application value.

Description

technical field [0001] The invention belongs to the field of material mechanical property detection, and relates to a method for evaluating the elastic modulus and strength of ring-shaped or round-tube-shaped brittle materials. The brittle material mainly refers to a class of materials with very small ultimate strain during fracture, such as ceramics and glass materials. Background technique [0002] The modulus of elasticity reflects the ability of a material to resist deformation caused by external forces, and is one of the basic mechanical properties of a material. Materials scientists and mechanics scientists all over the world have been looking for simple and accurate evaluation techniques for measuring elastic modulus. At present, the commonly used measurement methods are stress-strain method, bending method, displacement sensitive indentation method, acoustic resonance method and ultrasonic wave. The stress-strain method usually requires installing a strain gauge on...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 包亦望万德田刘正权刘小根李坤明
Owner 中国国检测试控股集团海南有限公司
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