CN85100056A - Measure the optical means and the device of material mechanical performance under the high temperature - Google Patents
Measure the optical means and the device of material mechanical performance under the high temperature Download PDFInfo
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- CN85100056A CN85100056A CN 85100056 CN85100056A CN85100056A CN 85100056 A CN85100056 A CN 85100056A CN 85100056 CN85100056 CN 85100056 CN 85100056 A CN85100056 A CN 85100056A CN 85100056 A CN85100056 A CN 85100056A
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- China
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- charger
- temperature
- mechanical performance
- holograph
- simple bending
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Abstract
Measure the optical means and the device of material mechanical performance under the high temperature, belong to the field of optical method for measuring material mechanical performance.
The present invention is in the high-temperature heater of silica glass window is arranged, lay a resistant to elevated temperatures simple bending charger, measured material is put between two edges of a knife of this device with the plate sample type, between the holograph double exposure, in addition suitably moment of flexure is taken hologram with image plane holograph light path, and the amount of deflection that obtains to pull distributes, and use Least Square in Processing, obtain modulus of elasticity and Poisson's ratio.
The present invention is between 20 ℃ of-1000 ℃ of temperature, non-contact measurement.Method is simple, the precision height, and sample dimensions is little, saves starting material.
Description
The invention belongs to field with the optical method for measuring material property.
Close technology can be with reference to " some application of holographic interferometry " (SoMe Application of holographic interferometry.Experimental Mechanics Vol8 P405)
At present existing method of testing mostly is normal temperature greatly and measures, and high temperature measurement has mechanical means, requires test specimen big, and measuring accuracy is low.The useful speckle method of optical means is measured elongation in the face, but because flexural deformation and displacement sensitivity are low, precision is not high in the use.
The purpose of invention is simply, accurately, use non-contact method down 1000 ℃ of high temperature in afterburning mode, once record the elastic modulus and the Poisson's ratio of material.
The main points of invention: the proving installation of material mechanical performance and method of testing under the high temperature, it has one can be heated to 1000 ℃, and the height insulation resistance furnace that the constant temperature precision is 1 ℃ is equipped with a resistant to elevated temperatures simple bending charger in body of heater.Measured material is processed into the plate sample type to be put between the edge of a knife of simple bending charger.Moment of flexure in addition between holograph double exposure, the force cell and the beam of uniform strength are measured moment simultaneously, take the amount of deflection that hologram obtains plate with image plane holograph light path and distribute, and try to achieve elasticity modulus of materials and Poisson's ratio.
Accompanying drawing one, the device synoptic diagram of material mechanical performance under the measurement high temperature
Accompanying drawing two, image plane holograph index path
Below in conjunction with accompanying drawing device of the present invention and method of testing are further elaborated.
Measure the device of material property under the high temperature and partly form (seeing accompanying drawing one) by three.First partly is heating and temperature control part branch.What specialized designs was made can be warmed to 1000 ℃, the height insulation resistance furnace (1) that the constant temperature precision is 1 ℃, and filling high-quality thermal insulation material (5) furnace wall in, by the flue (14) that the silit clay product is made, the stove silk arranges that the assurance heating-up temperature is even.There is a demountable silica glass window (2) in stokehold cover plate (3) central authorities, and in order to reduce heat radiation, stokehold cover plate (3) is hollow cover plate, so that the water flowing cooling keeps low temperature, avoid hot-air convection, to obtain the interference fringe of high-quality.The refractory brick (4) that double-deck quartz glass is arranged is placed in front shroud (3) back, to increase the sealing of fire door, reduces thermal convection, keeps high constant temperature precision.
Second of this device partly is to load and the dynamometry part, put a simple bending charger at the rear portion of flue (14), it has a simple bending fixture stand (6) that still has excellent mechanical performances under 1000 ℃ high temperature, fixture stand (6) processes through hot investment casting with novel eutectic, simple bending loads two pairs of edges of a knife (15) of being manufactured by corundum and is added on the test specimen (7), give top screw (13) and add a preload for test specimen (7), drop to prevent test specimen.Dynamometry partly is by cooling jacket (9), sensor (10), and the beam of uniform strength (11) loads screw (12) and forms.Load the added load of screw (12) by the transmission of the beam of uniform strength (11), steel ball, force cell (10), water jacket (9) and ceramic bar (8).Because heap(ed) capacity is little, the resistance strain gage on the available precise force-measuring sensor and the beam of uniform strength is dynamometry simultaneously.The 3rd partly is light path part (seeing accompanying drawing two).Adopt image plane holograph light path, ((16) are divided into thing light and reference light and expand bundle back lighting test specimen (7) and dry plate (21) through catoptron (18) and beam expanding lens (19) respectively through spectroscope (17) by laser instrument for it.High-quality lens (20) the test specimen imaging on egative film.
Measuring method: measured material is processed into plate test specimen (7), and (it is of a size of 130mm * 25mm * 2.5mm) and puts on the simple bending charger and adding a moment of flexure between the double exposure of holograph on plate test specimen spare (7).Moment of flexure is got apart from calculating by the force cell (10) and the edge of a knife.The amount of deflection that is obtained by the image plane holograph distributes, and can derive elastic modulus, Poisson's ratio and moment of flexure and Deflection Relationship is according to the simple bending plate theory:
W(X、Y) = (6M
X(X
2- vY
2))/(Et
3)
M
XBe unit bending moment, t test specimen thickness of slab, X, Y are the coordinate figure of initial point with the central point of plate, W(X, Y) be amount of deflection with respect to central point.By plate center shape of a saddle iso-deflection line can try to achieve Poisson's ratio or.X
1, Y
1, X
2, Y
2For 2 coordinate figure of striped, work as Y=0, have
E=(3M
X(X
2 2-X
1 2))/((W
2-W
1) t
3) try to achieve elastic modulus E.
In order to improve measuring accuracy, desirable a plurality of sampled points calculate on microprocessor with least square method.
The present invention can measure elastic modelling quantity and the Poisson's ratio of various materials under any temperature between 20 ℃～1000 ℃. Method is simple, the precision height, and the test specimen handling ease, the size trifle is economized measured material.
Claims (5)
1, a kind of sensor [10] and the beam of uniform strength [11] method of the measurement mechanical property of dynamometry simultaneously of using, it is characterized in that test specimen [7] is placed on the charger in the high insulation heating furnace [1] between two edges of a knife [15], between twice holographic exposure, simple bending moment of flexure in addition, the deformation pattern of image plane holograph taking panel can disposablely measure elastic modulus and Poisson's ratio.
2,, it is characterized in that this method is applicable to that temperature is between 20 ℃-1000 ℃ according to the said method of claim 1.
3, a kind of is claim 1,2 said methods and the device that designs, it is characterized in that this device by a height insulation heating furnace (1) that is warmed to 1000 ℃, is provided with resistant to elevated temperatures charger in its body of heater, dynamometry and image plane holographic light path four partly constitute.
4, according to the said device of claim 3, it is characterized in that but high insulation heating furnace front surface has the protecgulum (3) of hollow water flowing cooling, detachable guartz windowpane (2) is housed at the front shroud center, is placed with the refractory brick (4) of double-deck quartz glass behind the protecgulum (3).
5, according to the said device of claim 3, it is characterized in that the novel eutectic of 1000 ℃ of high temperature of simple bending fixture stand (6) ability of said simple bending charger processes through hot investment casting, two pairs of edges of a knife (15) are that corundum is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100056A CN85100056B (en) | 1985-04-01 | 1985-04-01 | Optical method and device for testing the mechanical property of the materials in high temperature condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100056A CN85100056B (en) | 1985-04-01 | 1985-04-01 | Optical method and device for testing the mechanical property of the materials in high temperature condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100056A true CN85100056A (en) | 1986-07-09 |
| CN85100056B CN85100056B (en) | 1988-03-09 |
Family
ID=4790850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100056A Expired CN85100056B (en) | 1985-04-01 | 1985-04-01 | Optical method and device for testing the mechanical property of the materials in high temperature condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85100056B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100557410C (en) * | 2006-11-03 | 2009-11-04 | 厦门大学 | The in-situ measurement device that is used for high temperature distortion ceramic fiber |
| CN101813417A (en) * | 2010-03-19 | 2010-08-25 | 南昌航空大学 | High temperature moire experimental furnace |
| CN1997999B (en) * | 2004-03-29 | 2010-09-08 | 彼德·T·杰尔曼 | Systems and methods to determine elastic properties of materials |
-
1985
- 1985-04-01 CN CN85100056A patent/CN85100056B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1997999B (en) * | 2004-03-29 | 2010-09-08 | 彼德·T·杰尔曼 | Systems and methods to determine elastic properties of materials |
| CN100557410C (en) * | 2006-11-03 | 2009-11-04 | 厦门大学 | The in-situ measurement device that is used for high temperature distortion ceramic fiber |
| CN101813417A (en) * | 2010-03-19 | 2010-08-25 | 南昌航空大学 | High temperature moire experimental furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85100056B (en) | 1988-03-09 |
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