Strain measurement method and device of object based on misplace relative theory

Abstract

A objects strain measurement method and system based on the principle of related dislocation includes digital imaging equipment, Coke set shot, wedge-shaped mirror and test pieces with double labeling. By using this method firstly it produces the double labeling being representatives of tensile deformation on the surface of the test object, secondly change the direction of the reflected light on the surface of object by a wedge mirror, the direction-changed light enters the digital imaging devices through the lens for Coke and get the double-labeled images with dislocation, finally, by using the figures related method which calculates the double labeling of displacement the object strain can be acquired. This invention effectively improves the image quality and the accuracy of figures related method. It calculates the marker images displacement with dislocation based on the figures related method, gets the object strain and improves the accuracy of the strain. It realizes the simple operation, the real-time nondestructive strain measurement with high precision and wide-range in a complex work environment.

Description

technical field [0001] The invention relates to an object strain measurement method and device based on the dislocation correlation principle. Background technique [0002] With the development of materials science and technology, accurate measurement of the mechanical properties of materials has become a necessary condition for the application of new materials. The test of mechanical properties of materials is mainly completed by the measurement of force and strain. The measurement of force is mainly realized by various load cells, while the measurement methods of strain are various, mainly including extensometer measurement and various optical methods. However, these traditional strain measurement methods have certain limitations in practical applications. [0003] The working principle of the extensometer is that the extensometer is clamped on the test piece, the blade is in contact with the test piece, the elongation of the test piece within the gauge length is felt, an...

AI Technical Summary

Problems solved by technology

However, due to the limitation of image magnification, the accuracy of strain calculation is not high

In the article "Research on High-precision Digital Image Correlation Measurement System and Its Technology", a method of digital correlation measurement using dual CCD technology is mentioned, which improves the strain solution accuracy of the digital correlation method, but due to the use of two CCD To carry out the test, the magnification of the imaging system composed of these two CCDs must be calibrated, otherwise the measurement results will have a large error, and this calibration process has strict requirements, complicated operation, and inconvenient use, so its application has also been restricted. certain limit

[0008] The above-mentioned methods have certain problems in practical application, and they cannot realize simple and convenient operation, real-time high-precision and large-range non-destructive strain measurement in complex working environments.

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