CN103557806A - Organic glass crazing maximum depth measuring method based on optical imaging - Google Patents
Organic glass crazing maximum depth measuring method based on optical imaging Download PDFInfo
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- CN103557806A CN103557806A CN201310562602.1A CN201310562602A CN103557806A CN 103557806 A CN103557806 A CN 103557806A CN 201310562602 A CN201310562602 A CN 201310562602A CN 103557806 A CN103557806 A CN 103557806A
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Abstract
The invention relates to an organic glass crazing maximum depth measuring method based on optical imaging. The organic glass crazing maximum depth measuring method based on the optical imaging comprises the following steps of (1) carrying out preparation work of crazing maximum depth measuring tests of an organic glass test piece, (2) adjusting the organic glass test piece to enable the organic glass test piece to be located at the optimal position for testing the crazing depth, (3) measuring the maximum depth of the crazing of the organic glass test piece by using a tool microscope, and (4) recording the measuring result of the maximum depth of the crazing of the organic glass test piece so that the measuring result can be taken as basic data for the research of the influence on the mechanical properties of the organic glass by the crazing. Based on the optical properties of the crazing, namely, the crazing has silver gloss under the irradiation of light rays while the rest part of the organic glass has light transmittance, the method for measuring the maximum depth of the crazing of the organic glass by using the tool microscope is provided, and the method is simple in test operation, easy to implement, low in cost and suitable for the measurement of the maximum depth of the crazing of the organic glass in engineering application.
Description
Technical field
The present invention relates to a kind of organic glass crazing depth capacity measuring method based on optical imagery, application tool microscope is observed organic glass, the depth capacity of crazing in measurement face, belong to experimental measurement method and technology field, be applicable to various types of organic glass crazing depth capacitys in engineering application and measure.
Background technology
Organic glass (PMMA) is the bulk polymer of methymethacrylate (MMA), is a kind of water white thermoplastics, is all the main material of the Transparent Parts such as aircraft cockpit all the time.Organic glass has many advantages that have in performance, as high in transmittance, proportion is little, intensity good, have good thermoplasticity and processing characteristics etc., makes the canopy, windscreen, view window of various aircraft etc. because being widely used in.Due to production technology, cost and the difference consideration to the performance of aircraft and purposes, also corresponding different to the requirement of Transparent Parts in Aviation, therefore there are many organic glass kinds.The current principal item of using on home-built aircraft has the casting poly (methyl methacrylate) plate of plasticising, as YB-2, YB-3; The casting poly (methyl methacrylate) plate of copolymerization, as YB-4; The oriented organo glass plate of plasticising, as DYB-2; The oriented organo glass plate of not plasticising, as DYB-3, MDYB-3; The oriented organo glass plate of copolymerization, as DYB-4, MDYB-4.No. 3 directed aerial organic glass of MDYB-3 aerial organic glass and grinding and polishing, there is good combination property, be the canopy of the various aircraft below 2.2 for the manufacture of Mach number, and likely accomplish that canopy and aircraft used with the life-span, used on partial domestic type.
The shortcomings such as for metal material, organic glass mechanical property is weak, and more problems in working service for a long time, often becomes and affect the fault of aircraft flight part, and main manifestations is that fault is many, poor stability, serviceable life are short.Pmma material or piece surface are subject to larger drawing stress, or are subject to the erosion of solvent or vehicle substance, or material processing, or improper to some extent in parts making assembling process, all can cause the generation of crazing.
Crazing is a kind of trickle crackle that appears at organic glass surface, under illumination, presents silvery white.Crazing and crackle fairly similar, difference is that in the middle of crackle be empty, has crazing matter to be connected in the cavity in the middle of crazing.Crazing development chap, the fracture of crazing matter, crackle.Crazing length dispersiveness is very large, the initial deficiency millimeter that occurs, and after development, from several millimeters to several centimetres, even tens centimetres.Heavier crazing also have a feature be direction unordered, mutually intersect.The above-mentioned feature of crazing is different from the crackle of hardware, is that the special micromechanism of high molecular polymer forms.
Crazing has a great impact the mechanical property of organic glass.The appearance of crazing and development, not only can reduce the transmittance of organic glass, has a strong impact on observation, and can reduce the mechanical property of material, causes intensity and plasticity to decline.The crackle being extended to by crazing and slotted eye crackle, if can not find in time, awing Quick Extended, can cause the air-shooting of hatchcover glass.In order to find in time canopy glass fault, guarantee flight safety, wherein an important maintenance work is exactly the depth parameter of grasping in time crazing, it is no more than and uses regulation.Therefore, need to measure the depth capacity of crazing, further research is containing the mechanical property of crazing organic glass.
At present, crazing to organic glass Effect on Mechanical Properties research and engineering application in, crazing depth survey is mainly to utilize Electron portable crazing degree of depth analyzer, by probing surface, measures certain any crazing degree of depth.In this crazing depth measurement method, the selection of measurement point has randomness, cannot guarantee accuracy and the representativeness of measurement result, and cannot verify its accuracy.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of measuring method of organic glass crazing depth capacity is provided, can solve crazing depth capacity crucial in the Mechanics Performance Testing of organic glass crazing measures, and be conducive to further analyze the impact of the crazing degree of depth on organic glass mechanical property, be applicable to engineering application, simple to operate, be easy to realize, and measuring accuracy is higher.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of organic glass crazing depth capacity measuring method based on optical imagery, and specific implementation step is as follows:
Steps A: carry out the preliminary work that organic glass test specimen crazing depth capacity is measured test;
Step B: adjust organic glass test specimen and make it in measuring the optimum position of the crazing degree of depth;
Step C: utilize tool microscope to measure organic glass test specimen crazing depth capacity;
Step D: record the measurement result of organic glass test specimen crazing depth capacity, using the data to organic glass Effect on Mechanical Properties research as crazing.
The preliminary work implementation procedure of carrying out the measurement of organic glass crazing depth capacity in described steps A is:
(A1) instrument and equipment of checking tool microscope measurement system, comprises tool microscope worktable;
(A2) open tool microscope measuring system, comprise two-dimensional coordinate Survey Software and soffit lighting lamp, and soffit lighting lamp is adjusted to suitable brightness;
(A3) select the object lens of suitable multiple.
In described step B, adjusting organic glass test specimen makes it in measuring the optimum position implementation procedure of the crazing degree of depth, be:
(B1) organic glass test specimen is placed on objective table, plane to be measured is towards object lens, and crazing depth direction is vertical with object lens axis direction;
(B2) adjust organic glass test specimen position, make crazing depth direction perpendicular to X-direction or the Y-direction of tool microscope.
In described step C, utilize tool microscope measurement organic glass test specimen crazing depth capacity implementation procedure to be:
(C1) adjust object lens to the distance on organic glass test specimen surface, imaging is clear on computers to make crazing;
(C2) according to the difference of brightness, in the visual field, comparatively bright belt-like zone is crazing region, and then differentiates crazing along two borders of depth direction;
(C3) moving stage, makes the crosshair on computer screen overlap with a border of crazing imaging, records this point coordinate, follows moving stage again, and crosshair is overlapped with another border of crazing imaging, records second point coordinate;
(C4) utilize calculate spacing function at 2 of tool microscope, the distance of output point-to-point transmission, i.e. crazing depth capacity measured value;
(C5) by step above, measure three times, get its mean value as crazing maximum depth value.
The invention has the advantages that:
(1) the present invention is based on the organic glass crazing depth capacity measuring method of optical imagery, compare with the existing Electron portable crazing degree of depth analyzer measuring method of utilizing, avoided the randomness of selection of measuring point, can measure exactly the depth capacity of organic glass crazing, filled up the blank of crazing depth survey technology, be conducive to carry out crazing organic glass Effect on Mechanical Properties is studied.
(2) the present invention is based on the organic glass crazing depth capacity measuring method of optical imagery, tool using microscope measurement system carries out the measurement of crazing depth capacity, and experimentation cost is cheap, and instrument and equipment is simple to operate, is easy to realize.
Accompanying drawing explanation
Fig. 1 is the crazing regional imaging under tool microscope;
Fig. 2 is operation chart of the present invention;
Fig. 3 is the clear crazing image schematic diagram that the present invention obtains;
Fig. 4 is the instrumentation plan of 0.4mm scratch depth organic glass test specimen 2, and wherein Fig. 4 (a) is first capture point, and Fig. 4 (b) is second capture point.
Embodiment
As shown in Figure 2, the inventive method specific implementation is:
1. carry out organic glass test specimen crazing depth capacity and measure the preliminary work of test;
The instrument and equipment of checking tool microscope measurement system, comprises tool microscope worktable etc.; Open tool microscope measuring system, comprise two-dimensional coordinate Survey Software and soffit lighting lamp, and soffit lighting lamp is adjusted to suitable brightness; Select the object lens of suitable multiple.
2. adjusting organic glass test specimen makes it in measuring the optimum position of the crazing degree of depth;
Organic glass test specimen is placed on objective table, and plane to be measured is towards object lens, and crazing depth direction is vertical with object lens axis direction; Adjust organic glass test specimen position, make crazing depth direction perpendicular to X-direction or the Y-direction of tool microscope, as shown in Figure 2.
3. utilize tool microscope to measure organic glass test specimen crazing depth capacity;
Adjust object lens to the distance of organic glass test specimen upper surface, imaging is clear on computers to make crazing; According to the difference of brightness, in the visual field, comparatively bright belt-like zone is crazing region, and then differentiates two borders of crazing on depth direction; Slowly moving stage, makes the crosshair on computer screen overlap with a border of crazing imaging, records this point coordinate, follows moving stage again, and crosshair is overlapped with another border of crazing imaging, records second point coordinate; Utilize calculate spacing function at 2 of tool microscope, the distance of output point-to-point transmission, i.e. crazing depth capacity measured value; By same step, measure three times, get its mean value as crazing maximum depth value.
4. record the crazing depth capacity measurement result of organic glass test specimen, using the data to organic glass Effect on Mechanical Properties research as crazing.
Embodiment 1: organic glass cut depth capacity is measured
Because organic glass crazing depth survey does not at present have method accurately, at this, utilize the measurement of organic glass scratch depth to verify the accuracy of the measuring method that the present invention proposes.Organic glass cut is to utilize high-precision carving machine process and go out, and its precision is 0.005mm.Utilize the organic glass crazing depth capacity measuring method that the present invention proposes also can measure organic glass cut depth capacity, and its measuring process is identical, measure respectively 0.2mm, the scratch depth of 0.3mm and 0.4mm scratch depth organic glass test specimen, its measurement result is as shown in table 1, wherein A, B, C represents respectively 0.2mm, and 0.3mm and 0.4mm scratch depth organic glass test specimen, get three test specimens for every type and measure.This measurement result shows that the organic glass crazing depth capacity measuring method that the present invention proposes can measure organic glass cut depth capacity exactly, can measure exactly organic glass crazing depth capacity exactly.
Table 1 cut depth capacity measured value
Embodiment 2: organic glass crazing depth capacity is measured
At research crazing, during on the affecting of organic glass mechanical property, all need to manually prepare crazing on organic glass test specimen surface.Here said crazing is called again stress solvent crazing, is to make by smearing organic solvent (such as alcohol) on the organic glass test specimen surface of bearing tension.In crazing preparation process, the surface that organic glass bears tension all the time with Ethanol Exposure, by setting the prefabricated time of crazing, can obtain the crazing of different depth.
A in the present embodiment 2, B, C is corresponding 10min respectively, and the organic glass test specimen of 18min and prefabricated time of 25min crazing, gets 5 test specimens for every type and measures, and its crazing depth capacity measurement result is as shown in table 2.From depth capacity measurement data, under same crazing preparation condition, crazing maximum depth value becomes along with the increase of prefabricated time of crazing greatly, and this is consistent with theoretical analysis.
Table 2 crazing depth capacity measured value
Non-elaborated part of the present invention belongs to those skilled in the art's known technology.
Claims (4)
1. the organic glass crazing depth capacity measuring method based on optical imagery, is characterized in that comprising the following steps:
Steps A: carry out the preliminary work that organic glass test specimen crazing depth capacity is measured test;
Step B: adjust organic glass test specimen and make it in measuring the optimum position of the crazing degree of depth;
Step C: utilize tool microscope to measure organic glass test specimen crazing depth capacity;
Step D: record the measurement result of organic glass test specimen crazing depth capacity, using the data to organic glass Effect on Mechanical Properties research as crazing.
2. a kind of organic glass crazing depth capacity measuring method based on optical imagery according to claim 1, is characterized in that: in described steps A, carrying out the preliminary work implementation procedure that organic glass crazing depth capacity measures is:
(A1) instrument and equipment of checking tool microscope measurement system, comprises tool microscope worktable;
(A2) open tool microscope measuring system, comprise two-dimensional coordinate Survey Software and soffit lighting lamp, and soffit lighting lamp is adjusted to suitable brightness;
(A3) select the object lens of suitable enlargement factor.
3. a kind of organic glass crazing depth capacity measuring method based on optical imagery according to claim 1, is characterized in that: in described step B, adjust organic glass test specimen and make it in measuring optimum position implementation procedure of the crazing degree of depth, be:
(B1) organic glass test specimen is placed on objective table, plane to be measured is towards object lens, and crazing depth direction is vertical with object lens axis direction;
(B2) adjust organic glass test specimen position, make crazing depth direction perpendicular to X-direction or the Y-direction of tool microscope.
4. a kind of organic glass crazing depth capacity measuring method based on optical imagery according to claim 1, is characterized in that: in described step C, utilize tool microscope to measure organic glass test specimen crazing depth capacity implementation procedure to be:
(C1) adjust object lens to the distance of organic glass test specimen upper surface, imaging is clear on computers to make crazing;
(C2) according to the difference of brightness, in the visual field, comparatively bright belt-like zone is crazing region, and then differentiates crazing along two borders of depth direction;
(C3) moving stage, makes the crosshair on computer screen overlap with a border of crazing imaging, records this point coordinate, follows moving stage again, and crosshair is overlapped with another border of crazing imaging, records second point coordinate;
(C4) utilize calculate spacing function at 2 of tool microscope, the distance of output point-to-point transmission, i.e. crazing depth capacity measured value;
(C5) by step above, measure three times, get its mean value as organic glass crazing maximum depth value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896516A (en) * | 2018-05-19 | 2018-11-27 | 芜湖新利德玻璃制品有限公司 | A kind of organic glass crazing detection device based on light transmittance |
| CN109013387A (en) * | 2018-07-17 | 2018-12-18 | 深圳市普盛旺科技有限公司 | Electrical core of power battery appearance detecting device |
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| JP2009214332A (en) * | 2008-03-07 | 2009-09-24 | Mitsubishi Electric Corp | Method and apparatus for manufacturing resin sheet |
| CN102252615A (en) * | 2010-05-19 | 2011-11-23 | 北京京东方光电科技有限公司 | Stamped mark width measuring device and method |
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Patent Citations (2)
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| JP2009214332A (en) * | 2008-03-07 | 2009-09-24 | Mitsubishi Electric Corp | Method and apparatus for manufacturing resin sheet |
| CN102252615A (en) * | 2010-05-19 | 2011-11-23 | 北京京东方光电科技有限公司 | Stamped mark width measuring device and method |
Non-Patent Citations (2)
| Title |
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| 李之达等: "PMMA银纹损伤实验研究", 《湘潭大学自然科学学报》, vol. 28, no. 03, 30 September 2006 (2006-09-30) * |
| 李倩妹等: "PMMA应力银纹损伤的实验研究", 《湖南工程学院学报(自然科学版)》, vol. 16, no. 03, 25 September 2006 (2006-09-25) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896516A (en) * | 2018-05-19 | 2018-11-27 | 芜湖新利德玻璃制品有限公司 | A kind of organic glass crazing detection device based on light transmittance |
| CN109013387A (en) * | 2018-07-17 | 2018-12-18 | 深圳市普盛旺科技有限公司 | Electrical core of power battery appearance detecting device |
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