Experimental apparatus and method for detecting crazes and defects of organic glass

A technology of plexiglass and experimental equipment, which is applied in the direction of measuring equipment, material analysis through optical means, instruments, etc., can solve the problems of plexiglass damage, high requirements for the experience level of testing personnel, and heavy workload of microscope observation, etc., to achieve Intuitive effect of reduced workload, craze and defect distribution and size

Inactive Publication Date: 2016-04-13
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the point contact measurement method not only has a cumbersome process but also causes certain damage to the plexiglass itself. The microscope observation method has a large workload and requires a high level of experience for the inspectors.

Method used

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  • Experimental apparatus and method for detecting crazes and defects of organic glass

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Spray black and white paint spots on the surface of the speckle marker 5;

[0028] 2) digital image correlation method software and MATLAB software are installed in computer 4;

[0029] 3) Aim the CCD camera 1 at the surface of the speckle marker 5, adjust the position and focal length of the CCD camera 1, so that the surface of the speckle marker 5 forms a clear image in the middle of the field of view of the CCD camera 1, and display it in the computer 4 Calibrate how many pixels each millimeter on the surface of the speckle marker 5 corresponds to in the entire image, and take a picture;

[0030] 4) Place the plexiglass test piece 7 on the speckle marker 5;

[0031] 5) Control the CCD camera 1 to take another picture at the same position;

[0032] 6) Calculate the speckle field change before and after placing the plexiglass test piece 7 with the digital image correlation method software in the computer 4, and then obtain the light deflection angle generated befo...

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Abstract

The invention relates to an experimental apparatus and method for detecting crazes and defects of organic glass by using a digital gradient sensing process, belonging to the technical field of mechanics and nondestructive testing. According to the invention, the digital gradient sensing process is employed; a CCD camera is used for shooting pictures of a speckle field before and after placing of to-be-detected organic glass; digital gradient sensing technology is used for measuring changes in the deflection angle of light caused by the organic glass before and after placing of the to-be-detected organic glass; so detection of the organic glass is realized, and the distribution and sizes of crazes and defects in the organic glass are obtained. The digital gradient sensing technology used in the invention is optical non-contact overall-field measurement technology which is more convenient and simpler and reduces workload compared with traditional contact measurement methods. For non-contact measurement, a digital gradient sensing algorithm is added in the invention compared with the prior art, so results of the distribution and sizes of the crazes and defects in the organic glass are more visual and more accurate.

Description

technical field [0001] The invention relates to a device and method for detecting plexiglass silver streaks and defects by using a digital gradient sensitive method, and belongs to the technical fields of experimental mechanics and nondestructive testing. Background technique [0002] The plexiglass will inevitably produce certain defects (such as silver cracks, microcracks, etc.) in the process of manufacturing, processing and assembly. During the service period, under the joint action of load / environment, the defective parts of the local stress concentration will form cracks. When the cracks extend to A critical size will lead to rapid fracture of the plexiglass. Therefore it is necessary to detect and evaluate plexiglass crazes and defects. At present, the method of detecting silver streaks and defects of plexiglass mainly uses the point contact measurement method, or uses a microscope to observe the crack length and expansion. However, the point contact measurement met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/958
CPCG01N21/958
Inventor 郝文峰郭广平陈新文马丽婷邓立伟
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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