CN85100056B - Optical method and device for testing the mechanical property of the materials in high temperature condition - Google Patents
Optical method and device for testing the mechanical property of the materials in high temperature condition Download PDFInfo
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- CN85100056B CN85100056B CN85100056A CN85100056A CN85100056B CN 85100056 B CN85100056 B CN 85100056B CN 85100056 A CN85100056 A CN 85100056A CN 85100056 A CN85100056 A CN 85100056A CN 85100056 B CN85100056 B CN 85100056B
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Abstract
The present invention relates to an optical method and an optical device for measuring the mechanical properties of materials under high temperature, which belongs to the field of an optical method for measuring the mechanical properties of materials. In the present invention, a high temperature resistant pure bending loading device is installed in a high temperature heating stove of a silica glass window; a measured material is put between two cutting edges of the device in the mode of a plate test piece; during the interval of two times of holography exposure, a proper bending moment is added; a hologram is shot by the holography of an image plane in the mode of a union path; the bending deflection distribution is obtained and is processed by a least square method to solve the modulus of elasticity and poissons ratio. The present invention uses a non-contact mode of measurement from the temperature of 20 DEG C to 1000 DEG C. The method has the advantages of simplicity, high precision, small size of a test piece and material saving.
Description
The invention belongs to field with the optical method for measuring material property.
Close technology
1. " some application of holographic interferometry " (SoMe Application of holographic interferometry.Experimental Mechanics vo18 P405〕
2. " application of holography method in Experimental Mechanics " (collection of translations), Science Press, 1977.7(Beijing)
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, and 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.
Obtaining the method that the amount of deflection of plate distributes with holographic interferometry is: measured material is processed into the plate test specimen puts on the simple bending charger adding a moment of flexure between the double exposure of holograph on the plate test specimen.The amount of deflection that is obtained by the image plane holograph distributes, and can derive Poisson's ratio and moment of flexure and Deflection Relationship according to the simple bending plate theory and be:
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.Can try to achieve Poisson's ratio by plate center shape of a saddle iso-deflection line
X
1, Y
1, X
2, Y
2Be 1,2 coordinate on the striped.
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 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 is further elaborated.
Measuring the device of the mechanics of materials under the high temperature partly forms by three.(seeing accompanying drawing one).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, and 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), gives top screw (13) and adds a preload for test specimen (7), drops 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, it by laser instrument (16) through spectroscope (17), be 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, high-quality lens (20) the test specimen imaging on egative film.
The present invention can measure the elastic modulus 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 device of measuring material mechanical performance under the high temperature, it comprises:
A, the height insulation heating furnace that can be warmed to 1000 ℃, wherein, but the protecgulum (3) that hollow water flowing cooling is arranged in the front of heating furnace, 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)
B is arranged on the charger in the body of heater, and wherein, simple bending fixture stand (6) is for the novel eutectic of 1000 ℃ of high temperature of ability processes, and two pairs of edges of a knife (15) are that corundum is made,
C, measuring holographic interference system, wherein, image plane holograph light path, by laser instrument (16), through spectroscope (17), catoptron (18), and beam expanding lens (19), by lens (20) with the test specimen imaging on dry plate (21),
D, dynamometric system wherein, comprises cooling jacket (9), force cell (10), the beam of uniform strength (11) loads screw (12).
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 CN85100056A (en) | 1986-07-09 |
| CN85100056B true CN85100056B (en) | 1988-03-09 |
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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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005098731A2 (en) * | 2004-03-29 | 2005-10-20 | German Peter T | 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 |
| CN101813417B (en) * | 2010-03-19 | 2012-05-23 | 南昌航空大学 | High temperature moire experimental furnace |
-
1985
- 1985-04-01 CN CN85100056A patent/CN85100056B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN85100056A (en) | 1986-07-09 |
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