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Non-contact type measurement indirect tensile strain method

A tensile strain, non-contact technology, applied in measurement devices, instruments, optical devices, etc., can solve the problems of low accuracy of measurement methods, limited measurement area, small measurement range, etc., to achieve easy operation, simple steps, The effect of high measurement accuracy

Inactive Publication Date: 2008-05-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problems of low precision, small measurement range and limited measurement area of ​​the existing indirect tensile strain measurement method, the present invention provides a non-contact method for measuring indirect tensile strain

Method used

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Embodiment Construction

[0030] The specific process of the method for non-contact measurement of indirect tensile strain in this embodiment is:

[0031] Step 1, prepare Marshall test piece;

[0032] Step 2, cutting the prepared Marshall test piece to a height of 63.5±1.3mm;

[0033] Step 3, performing artificial spotting on the cut end face of the test piece obtained in step 2, and then drying;

[0034] Step 4, fixing the test piece obtained in step 3 in the fixture of the mechanical loading instrument;

[0035] Step 5. Fix and place the lens of the CCD camera relative to the end face of the artificial speckled specimen;

[0036] Step 6, fixing a measuring light source between the end face of the artificially speckled test piece and the CCD camera, the measuring light source makes the light on the end face of the artificially speckled test piece uniform;

[0037] Step 7. Adjust the CCD camera so that the optical axis of the CCD camera is perpendicular to the end face of the artificially speckled t...

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Abstract

The invention provides a non-contact measuring method of indirect stretching strain and relates to a measuring method of stretching strain. The invention solves the problems that the prior measuring method of indirect stretching strain has low accuracy, small measuring range, limited measuring area, etc. In invention, the end surface of the measured component is artificially variegated and the image information of the artificial variegated end surface is recorded by a CCD camera in the loaded process of the measured component, and then the interrelated digital variegation method is adopted to analyze the image information, therefore, the strain information of the artificial variegated end surface of the measured component can be acquired. The invention adopts the developed interrelated digital variegation method of the prior art as the basis and combines the interrelated digital variegation method with the indirect stretching test, therefore, a novel measuring method of indirect stretching strain can be formed; the invention can be applied in the occasion with the requirement of measuring indirect stretching strain.

Description

technical field [0001] The invention relates to a method for measuring indirect tensile strain. Background technique [0002] Due to the simple method of the indirect tensile test, the stress state of the specimen during the test is very similar to the stress state of the asphalt concrete layer under the action of the wheel load. It is very easy to use this test to simulate the actual stress damage of the road surface. Many countries and Units are both researched and applied. However, as the key index of this test—accurate measurement of indirect tensile strain has always been the focus of research in various countries. Currently, the main methods for obtaining indirect tensile strain and their limitations are as follows: [0003] (1) Calculation method [0004] By measuring the total deformation of the specimen in the x and y directions during the test, the indirect tensile strain is obtained by substituting it into the plane elastic theory. The mechanical model of this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 谭忆秋吴思刚王强张魁公维强
Owner HARBIN INST OF TECH
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