CN1041450A - Elasto-plastic stress analysis light paster and grid sheet thereof - Google Patents
Elasto-plastic stress analysis light paster and grid sheet thereof Download PDFInfo
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- CN1041450A CN1041450A CN 88106438 CN88106438A CN1041450A CN 1041450 A CN1041450 A CN 1041450A CN 88106438 CN88106438 CN 88106438 CN 88106438 A CN88106438 A CN 88106438A CN 1041450 A CN1041450 A CN 1041450A
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- grid sheet
- paster
- light paster
- module
- grid
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- 239000004033 plastic Substances 0.000 title abstract description 9
- 229920003023 plastic Polymers 0.000 title abstract description 9
- 238000004458 analytical method Methods 0.000 title abstract description 7
- 239000004417 polycarbonate Substances 0.000 claims abstract description 46
- 229920000515 polycarbonate Polymers 0.000 claims abstract description 46
- 239000002245 particle Substances 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 4
- 241000216843 Ursus arctos horribilis Species 0.000 claims description 17
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000010792 warming Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 20
- 230000003287 optical effect Effects 0.000 abstract description 8
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 238000003556 assay Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The light paster system of a kind of bullet-plastic stress analysis usefulness is made by polycarbonate (PC) particle, and the available dedicated mould is made the grid sheet of being made up of a series of grizzly bars, and can be made into various difform curved surface light pasters and grid sheet thereof.System grid mould is mainly by the module and the block that scribble release agent on a series of surfaces, and cushion block constitutes.Polycarbonate light paster of the present invention and grid sheet thereof can carry out bullet-plastic stress assay determination to actual engineering structure, and can improve the measuring accuracy and the decomposition rate of optical patch method.
Description
The present invention relates to a kind of light paster and grid sheet and their manufacture method of elasto-plastic stress analysis usefulness.
Optical patch method is the stronger a kind of method of testing of practicality in the photo-measuring experimental mechanics, its outstanding advantage is not only can under lab study, and can also metal or nonmetal on, on the practical structures surface and under the actual working conditions, carry out whole audience stress analysis and working component is carried out quiet, dynamically reach play-plastic deformation's mensuration.Optical patch method is a kind of photoelastic technique of comparative maturity, but it is higher owing to lacking sensitivity for many years, the linear strain amount is big, the good and photosensitive material that is easy to obtain of performance and lack method of decomposing principle stress preferably etc., thereby limited the application widely of this method.
At present, polycarbonate (PC) is considered to elastooptic mateiral preferably in photo-measuring experimental mechanics.It highly sensitive, optical property, mechanical property is good, and especially linear strain amount is big, therefore is particularly suitable for structure is carried out the elasto-plastic stress analysis.People such as U.S. F. Zan Deman showed and mentioned in " photoelastic coating method " book in 1977, and in many macromolecular materials, polycarbonate is a light paster material preferably, and generally, it has many comprehensive premium properties, but it can not be used for the composite curvature surface.Polycarbonate can only be made the plane plate at present, does not still have the curved surface paster that PC makes, and therefore grizzly bar paster and grizzly bar curved surface paster etc. can only use at the planar section of structure, and the application of this elastooptic mateiral preferably of polycarbonate is restricted.
Another difficult problem that exists in the optical patch method is to lack the method for decomposing principle stress preferably, commonly used is angle beam method at present, since bigger with this method to the measuring error of isoclinic line parameter, particularly under the curved surface situation, sometimes be difficult to record, thereby influenced measuring accuracy.Nineteen sixty-five, O ' Reeam has proposed band (grid sheet) method, can obtain single strain value in this way, does not have the strain resolution problem, so this method has obtained people's attention.In order to solve actual needs, there is photosensitive one by one of human to stick into light paster screen.The band area that sticks in this way is little, and the grizzly bar broad, thereby transversal effect can't be eliminated.As the requirement of strip width, then not only be difficult to make, and can't paste, let alone on curved surface, used by W/h≤0.34.Also there is the method for human machining to process screen, but add clamping difficulty not only in man-hour, and owing to process with very thin slitting milling cutter, the plastics thermal diffusivity is bad, machining stress is very big in the screen, thereby the screen of making is of poor quality, can not be used for the stress test of actual components, more can not make various difform curved surface screens.
The objective of the invention is to, work out with highly sensitive, the polycarbonate pellets that performance is good is a raw material, directly in the laboratory, produce the technology of plane and curved surface light paster, particularly work out with the polycarbonate pellets is raw material, make the method for the curved surface light paster grid sheet of plane and different shape,, make it more to be widely used for the elasto-plastic stress analysis of actual engineering structure to improve the measuring accuracy and the decomposition rate of optical patch method.
Concrete solution of the present invention is as follows:
Polycarbonate pellets after processed, is put into cleaned making sheet mould, be warming up to 215 ℃～250 ℃, pressurization 1～3kg/cm
2, and reduce to room temperature after being incubated 0.2～4 hour, polycarbonate (PC) planar light paster.
PC planar light paster is placed on the curved portion place of measured parts or its analogue body, when being warming up to 170 ℃～205 ℃, being incubated and reducing to room temperature after 0.5～3 hour, PC curved surface light paster.
PC light paster grid sheet system makes the grid sheet of being made up of a series of grizzly bars by PC planar light paster through particular manufacturing craft, the width W of grizzly bar=0.3～2mm, ratio W/h≤0.34 of the width W of grizzly bar and grid sheet thickness h.Difference h-hc≤0.2mm of grid sheet thickness h and grizzly bar height hc.
This system grid particular manufacturing craft mainly scribbles 1 of release agent by a series of surface
#Module, 2
#Module and block, cushion block constitute.2
#Module and 1
#The difference of the height of module is the height of each grizzly bar, 1
#The width of module is the width of grizzly bar.
When making PC planar light paster grid sheet, at first make PC planar light paster plate, place it on die bottom plate or the mould pressurization 1～2kg/cm when being warming up to 210 ℃～240 ℃ then by above-mentioned technology
2, and reduce to room temperature after being incubated 0.2～3 hour.
When making PC curved surface light paster grid sheet, at first make PC planar light paster grid sheet, place it in the curved portion place of measured parts or its analogue body then, when being warming up to 170 ℃～200 ℃, be incubated 0.2～2 hour, reduce to room temperature then by above-mentioned technology.
Use above-mentioned technology and can be made into various difform PC curved surface light pasters and grid sheet thereof.
The present invention is a raw material with the PC particle, directly in the laboratory, produce various smooth pasters and grid sheet thereof, through optics and Mechanics Performance Testing, proof has higher optical sensitivity and less mechanics and optics creep, really be light paster material preferably, and the type testing of the diameter pressurized annulus through having theoretical solution etc., prove by the distribution curve of stress of the trial value of PC light paster grid sheet gained and Theoretical Calculation basic identical.And under the same terms, ratio error is bigger mutually with theoretical value to decompose principle stress gained stress value with angle beam method, and this just proves with the material of PC light paster grid sheet as the optical patch method test, truly has the effect that improves measuring accuracy.
As follows to the appended description of drawings of this instructions now:
Fig. 1 (a) is system grid particular manufacturing craft figure, and Fig. 1 (b) is planar gate sheet figure, and Fig. 1 (c) is grizzly bar figure.
Fig. 2 is that PC planar light paster is made thetagram.
Fig. 3 is that PC planar light paster grid sheet is made thetagram.
Fig. 4 is that PC curved surface light paster is made thetagram.
Fig. 5 is that PC curved surface light paster grid sheet is made thetagram.
Fig. 6 is PC light paster grid sheet annealing temperature curve figure.
Introduce below and implement several embodiments of the present invention.
At first raw material is carried out cleaning and dehydration, earlier the PC particle that cleans is placed in the container during dehydration, place then and carry out processed in the baking oven.Dehydration temperaturre is 120 ℃～150 ℃, and constant temperature time is 5～25 hours (under the condition of relative humidity about 60%).
Embodiment one: the making of PC planar light paster
Take out a certain amount of PC particle that had taken off water as required, put it in the cleaned making sheet mould, put into baking oven, control by temperature curve shown in Figure 2 then, when temperature rises to 215 ℃, add 1kg/cm thereon
2Pressure, be incubated and reduce to room temperature after 1 hour.
Embodiment two: the making of PC planar light paster grid sheet
1. cleaning and assemble particular manufacturing craft
At first will make all parts acetone scrub of grid mould, remove surface contaminants, and with its oven dry.All component surfaces after the oven dry are coated with one deck silicone oil make release agent, then with 1
#Module (3), 2
#Module (4), cushion block (6) and block (5) are assembled into the special use system grid mould shown in Fig. 1 (a).
Present embodiment PC planar light paster grid sheet is shown in Fig. 1 (b).Its each grizzly bar is shown in Fig. 1 (c).Its width W=1mm, the height hc=2.8mm of grizzly bar, the thickness h=3mm of grid sheet.
2. screen is made
At first press embodiment one and make PC planar light paster plate, then it is cleaned with alcohol and carry out dried.Be placed on the PC plate of handling well in the baking oven and install and make the grid mould.
Control by temperature curve shown in Figure 3, when temperature is raised to 216 ℃, add 1kg/cm
2Pressure, and the insulation, reduce to room temperature after 1.5 hours.
Embodiment three: thickness is the making of the PC curved surface light paster of 3mm
At first press embodiment one and make PC planar light paster plate, measure the size at parts position then according to actual desire, take out required area, and also dry with the wipes of alcohol wash clean.Again the desire of parts is surveyed position or its analogue body acetone scrub, put into baking oven after the oven dry.At last off-the-shelf PC plate is placed on the curved portion place of measured parts or its analogue body, controls by temperature curve shown in Figure 4.When temperature rises to 195 ℃, be incubated and reduce to room temperature after 1.5 hours.
Embodiment four: the making of PC curved surface light paster grid sheet
At first press embodiment two and make PC planar light paster grid sheet, undertaken by the step of embodiment three then, and control by temperature curve shown in Figure 5, when being warming up to 185 ℃, being incubated and reducing to room temperature (the grizzly bar end face of present embodiment is the convex surface curved surface) after 1.3 hours.
More than each embodiment PC light paster or its grid sheet all need before use in light field, check earlier, see that it has or not initial birefringence, if having then and need anneal.During annealing at first with alcohol with paster or grid sheet scrub, be placed on clean flat board, on the surface of parts or its analogue body, and put in the baking oven.Control by temperature curve shown in Figure 6 then, when being warming up to 160 ℃, being incubated and reducing to room temperature after 2 hours.
Claims (4)
1, a kind of light paster made from polycarbonate (PC) particle is characterized in that, this paster available dedicated mould is made the grid sheet of being made up of a series of grizzly bars (1) (2); And can be made into various difform curved surface light pasters and grid sheet thereof.
2, smooth paster according to claim 1 is characterized in that, the width W=0.3～2mm of grizzly bar (1), the width W of grizzly bar and the ratio w/h≤0.34. grid sheet thickness h of grid sheet thickness h and difference h-hc≤0.2mm of grizzly bar height hc.
3, smooth paster according to claim 1 is characterized in that,
PC planar light paster manufacture craft parameter is: be warming up to 215 ℃～250 ℃, pressurization 1～3kg/cm
2, and reduce to room temperature after being incubated 0.2～4 hour;
PC planar light paster grid sheet manufacture craft parameter is: be warming up to 210 ℃～240 ℃, pressurization 1～2kg/cm
2, and reduce to room temperature after being incubated 0.2～3 hour;
PC curved surface light paster manufacture craft parameter is: when being warming up to 170 ℃～205 ℃, being incubated and reducing to room temperature after 0.5～3 hour;
PC curved surface light paster grid sheet manufacture craft parameter is: when being warming up to 170 ℃～200 ℃, be incubated 0.2～2 hour, reduce to room temperature then.
4, smooth paster according to claim 1 is characterized in that, system grid particular manufacturing craft mainly scribbles 1 of release agent by a series of surface
#Module (3), 2
#Module (4) and block (5), cushion block (6) constitute; 2
#Module and 1
#The difference of the height of module is the height of each grizzly bar, 1
#The width of module is the width of grizzly bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106438 CN1017827B (en) | 1988-09-20 | 1988-09-20 | Optical posted sheet and its grid sheet for elastic-plastic stress analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106438 CN1017827B (en) | 1988-09-20 | 1988-09-20 | Optical posted sheet and its grid sheet for elastic-plastic stress analysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041450A true CN1041450A (en) | 1990-04-18 |
| CN1017827B CN1017827B (en) | 1992-08-12 |
Family
ID=4834244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88106438 Expired CN1017827B (en) | 1988-09-20 | 1988-09-20 | Optical posted sheet and its grid sheet for elastic-plastic stress analysis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017827B (en) |
-
1988
- 1988-09-20 CN CN 88106438 patent/CN1017827B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1017827B (en) | 1992-08-12 |
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