CN101593442A - Self can produce the photoelastic model of interference fringe - Google Patents
Self can produce the photoelastic model of interference fringe Download PDFInfo
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- CN101593442A CN101593442A CNA2009100324086A CN200910032408A CN101593442A CN 101593442 A CN101593442 A CN 101593442A CN A2009100324086 A CNA2009100324086 A CN A2009100324086A CN 200910032408 A CN200910032408 A CN 200910032408A CN 101593442 A CN101593442 A CN 101593442A
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Abstract
The invention discloses the photoelastic model that use in a kind of optic test field.Specifically be a kind ofly self can produce the photoelastic model of interference fringe.Comprise true form according to stressed object, make of makrolon material with the same or analogous model test piece of stressed body form, be attached with the polarisation rete closely on the two sides, front and back of model test piece.The invention has the beneficial effects as follows: adopt the model test piece of this invention can omit the polariscope of traditional photo-elastic instrument, complicated and huge light path system such as slide, make the complete miniaturization of photo-elastic instrument, be easy to carry, save equipment investment, particularly when the observation STRESS VARIATION, even give the certain external force of model with hand in the sun, can on model, observe change of interference fringes, be particularly suitable for the teacher intuitively shows stress distribution from symmetrical structure to the student, St. Venant principle, mechanical concept such as stress is concentrated, allow the student " see ess-strain ", directly perceived lively, convenient teacher on class carries, and really accomplishes to bring the laboratory into classroom.
Description
Technical field
The present invention relates to the photoelastic model that use in a kind of optic test field.Specifically be a kind ofly self can produce the photoelastic model of interference fringe.It is the model test piece that is used for the optical stresses test.
Background technology
Photoelastic method is a kind of optical stresses measuring method.It is to utilize the transparent material with birefringenct property to be made into and actual engineering structure, parts or the similar model of part geometry shape, and on model, apply the load similar to physical unit, can the computation model border and the stress of inner each point according to photoelasticity fringe, be converted into stress on actual engineering structure, parts or the part according to similarity theory again.But the problem that exists is: produce interference fringe in this general models, need the optical system of a cover necessary complexity of generation interference fringe as shown in Figure 1.S among the figure---light source, W---bosh, L
1---quasi-optical mirror, P---polarizer, Q
1---wave plate, M---model and loading frame, Q
2---wave plate, A---analyzing prism (analyser), L
2---imaging lens, F---color filter, R---light, T---projection.
Summary of the invention
For solving the problems of the technologies described above, the invention provides and a kind ofly self can produce the photoelastic model of interference fringe.Utilize the present invention, test specimen can have the time spent of doing of external force can produce interference fringe under ordinary light source, and the polariscope, slide etc. that omitted traditional photo-elastic instrument are complicated and huge light path system makes the complete miniaturization of photo-elastic instrument, is easy to carry, and saves equipment investment.
The scheme that technical solution problem of the present invention is adopted is: a kind ofly self can produce the photoelastic model of interference fringe, comprise true form according to stressed object, with the model test piece similar that makrolon material is made with stressed object, be attached with the polarisation rete closely on the two sides, front and back of model test piece.
Because the membrane material of light polarizing film is the high molecular polymer of doping iodine molecule, preferably polyethylene alcohol.The big molecular link of high molecular polymer all is complete uniform irregular ordered aggregation film forming on all directions, after stretching, nearly all macromolecular chain all is forced to extend according to the tensile force direction, has formed as the structure of fence with in the strong anisotropy of both direction in length and breadth.Because iodine molecule has asymmetric electronics (cloud) density when same direction is arranged, so the polarized light absorption coefficient difference of different directions.If the polarization direction of light is parallel with the iodine molecule long axis direction, then polarized light can be absorbed and unglazed seeing through; When if the polarization direction of light is vertical with the iodine molecule long axis direction, then polarized light can pass through fully, have only the linearly polarized photon parallel to see through with the absorption axes direction, see through light intensity also weakens thereupon, the model that the two sides is posted light polarizing film is placed in the light field, after light passes through light polarizing film, become linearly polarized light, when this linearly polarized light enters the polycarbonate transparent model of plane stress state, just it is mutually perpendicular to be decomposed into direction of vibration, two groups of light that velocity of propagation is different, and these two groups of light respectively with model in principle stress σ
1And σ
2Direction identical because the velocity of propagation difference of two groups of light in model, seeing through the optical path difference that produces behind the model is Δ, the optical path difference of any point is directly proportional with the deviator stress and the thickness of respective point, that is: Δ=ct (σ in the model
1-σ
2), two groups of light that leave model subsequently enter another light polarizing film, make two groups of light in the internal vibration of same plane, thereby interfere striped.By digital image processing techniques, can provide stress distribution by shape of stripes.
The invention has the beneficial effects as follows: adopt the model test piece of this invention can omit the polariscope of traditional photo-elastic instrument, complicated and huge light path system such as slide, make the complete miniaturization of photo-elastic instrument, be easy to carry, save equipment investment, particularly when the observation STRESS VARIATION, even give the certain external force of model with hand in the sun, can on model, observe change of interference fringes, be particularly suitable for the teacher intuitively shows stress distribution from symmetrical structure to the student, St. Venant principle, mechanical concept such as stress is concentrated, allow the student " see ess-strain ", directly perceived lively, convenient teacher on class carries, and really accomplishes to bring the laboratory into classroom.
Description of drawings
Fig. 1 is the prior art synoptic diagram;
Fig. 2 is a structural representation of the present invention.
Among the figure: 1, model test piece, 2, light polarizing film, 3, transparent adhesive tape.
Embodiment
As shown in Figure 2, the photoelastic model that self can produce interference fringe is made up of with the light polarizing film 2 that transparent adhesive tape 3 sticks on model test piece 1 front-back model test piece 1.Model test piece 1 is according to the true form of stressed object, with the makrolon material making, and is same or similar with stressed body form; The size of model test piece is amplified in proportion according to the experiment condition all directions or is dwindled; Transparent adhesive tape preferred epoxy glue.Two sides, front and back in model test piece is pasted with light polarizing film 2 closely with epoxide-resin glue, treat the epoxy resin full solidification after, can test.Light polarizing film thickness can both produce interference fringe preferably according to experimental result between 0.04 millimeter-0.40 millimeter, present embodiment adopts 0.20 millimeter.The light polarizing film size is covered with the two sides, front and back of model test piece.
Claims (8)
1, a kind ofly self can produce the photoelastic model of interference fringe, it is characterized in that: comprise true form according to stressed object, make of makrolon material with the same or analogous model test piece of stressed body form, be attached with the polarisation rete closely on the two sides, front and back of model test piece.
2, according to claim 1ly self can produce the photoelastic model of interference fringe, it is characterized in that: the membrane material of described polarisation rete is the high molecular polymer of doping iodine molecule.
3, according to claim 1ly self can produce the photoelastic model of interference fringe, it is characterized in that: the membrane material of described polarisation rete is the polyvinyl alcohol (PVA) of doping iodine molecule.
4, according to claim 1ly self can produce the photoelastic model of interference fringe, it is characterized in that: the polarisation rete is that light polarizing film is sticked on the two sides, front and back of model test piece closely with transparent adhesive tape.
5, describedly self can produce the photoelastic model of interference fringe according to claim 1 or 4, it is characterized in that: the polarisation rete is that light polarizing film is sticked on the two sides, front and back of model test piece closely with epoxide-resin glue.
6, according to claim 1ly self can produce the photoelastic model of interference fringe, it is characterized in that: light polarizing film thickness is 0.04 millimeter-0.40 millimeter.
7, according to claim 1ly self can produce the photoelastic model of interference fringe, it is characterized in that: the light polarizing film size is covered with the two sides, front and back of model test piece.
8, according to claim 1ly self can produce the photoelastic model of interference fringe, it is characterized in that: but the size of described model test piece is amplified in proportion according to the experiment condition all directions or is dwindled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100324086A CN101593442A (en) | 2009-06-13 | 2009-06-13 | Self can produce the photoelastic model of interference fringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100324086A CN101593442A (en) | 2009-06-13 | 2009-06-13 | Self can produce the photoelastic model of interference fringe |
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|---|---|
| CN101593442A true CN101593442A (en) | 2009-12-02 |
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| CNA2009100324086A Pending CN101593442A (en) | 2009-06-13 | 2009-06-13 | Self can produce the photoelastic model of interference fringe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162834A (en) * | 2013-03-05 | 2013-06-19 | 中北大学 | Multi-reflection single elastic light modulation Fourier transformation spectrometer light path structure |
| CN110186601A (en) * | 2019-04-29 | 2019-08-30 | 同济大学 | A kind of transmission-type photo-elastic instrument |
| CN110349486A (en) * | 2019-07-23 | 2019-10-18 | 南开大学 | A kind of large-scale demonstrator for light polarization phenomenon |
-
2009
- 2009-06-13 CN CNA2009100324086A patent/CN101593442A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162834A (en) * | 2013-03-05 | 2013-06-19 | 中北大学 | Multi-reflection single elastic light modulation Fourier transformation spectrometer light path structure |
| CN110186601A (en) * | 2019-04-29 | 2019-08-30 | 同济大学 | A kind of transmission-type photo-elastic instrument |
| CN110349486A (en) * | 2019-07-23 | 2019-10-18 | 南开大学 | A kind of large-scale demonstrator for light polarization phenomenon |
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Open date: 20091202 |