CN2488046Y - Strain sensor - Google Patents
Strain sensor Download PDFInfo
- Publication number
- CN2488046Y CN2488046Y CN 01206862 CN01206862U CN2488046Y CN 2488046 Y CN2488046 Y CN 2488046Y CN 01206862 CN01206862 CN 01206862 CN 01206862 U CN01206862 U CN 01206862U CN 2488046 Y CN2488046 Y CN 2488046Y
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- strain
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- test specimen
- arc
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Abstract
The utility model provides a strain sensor which can precisely measure a material with gross distortion, comprising a pair of clamping tools, a test piece and a metal girder, wherein, the metal girder is provided with a strain foil. The utility model is characterized in that a top base and a bottom base of the clamping tool are provided with knife edges, a cushion block is arranged between the clamping tool and the plane of the test piece, and the two ends of the metal girder is fixed on a shaft capable of rotating freely. The transient variation of a scale distance in the process of drawing the test piece is at any moment conveyed to the strain foil arranged in the middle part of a circular arc by the deformation of the elastic thin metal girder of a circular arc shape. The accurate strain data of the drawn test piece can be obtained by the collection of the deformation signal of the strain foil and certain corresponding relations. The utility model can be used in the contact measurement of various creep tests at a normal temperature.
Description
Technical field
The utility model relates to the strain gauge sensors technical field.
Background technology
The accurate problems of measurement of large deformation material is to perplex a difficult problem of deformation measurement always.As everyone knows, the easiest accurate strain measurement method is to paste foil gauge on the test specimen surface.But the maximum strain of the present institute of this method energy measurement has certain limitation, when surpassing this scope, can cause the local unsticking of foil gauge to slide even come off etc., directly influences measuring accuracy.For example the general industry plastic or other material is in the process of creep, and strain can be up to 200%, considerably beyond general foil gauge institute energy measurement scope.Therefore be necessary to develop the sensor of the really big strain of a kind of novel accurate measurement amount, this class difficult problem of dissolving in the real work to be run into.
Summary of the invention
The purpose of this utility model provides a kind of strain transducer, it can solve the accurate problems of measurement of large deformation material effectively, overcome the shortcoming of prior art, and this strain transducer can provide accurately effectively measurement to the creep process such as materials such as engineering plastics.The purpose of this utility model can be realized that this strain transducer comprises a sub-folder tool and test specimen and elastic metallic beam by following technical scheme, and elastic metallic beam two ends are fixed on the axle that can rotate freely.Described elastic metallic beam is circular-arc, and the upper surface of dome posts foil gauge.The top base and the bottom base of anchor clamps are equipped with the edge of a knife, and two vertical lines crossing the edge of a knife pass through the center of elastic metallic beam two ends rolling bearing respectively.Be provided with cushion block between the plane of anchor clamps and test specimen, be provided with the PEF film between the plane of cushion block and test specimen.Top base has two boss that are provided with rolling bearing, and the two ends of described axle cooperate with rolling bearing.Connect circular-arc elastic metallic beam about two anchor clamps be that bolt by four pieces of band springs directly is fixed on the test specimen that is stretched, about up and down four edges of a knife provide the gauge length of the test specimen that is stretched exactly, cross the center of the vertical line of the edge of a knife by rolling bearing, make the gauge length of the test specimen that is stretched equal the chord length of circular-arc elastic metallic beam under the free state by two rolling bearing centers, this fixed form can guarantee that test specimen variation of gauge length in drawing process is reflected accurately.Circular-arc elastic metallic beam: the two ends of circular-arc beams of metal are fixed on and can rotate freely on the axle, the two ends of axle link to each other with the boss of two top bases respectively by two rolling bearing, foil gauge is posted at the middle part of circular-arc beams of metal, the variation of the test specimen gauge length length in drawing process that is stretched will cause the chord change of circular-arc beams of metal, this variation causes circular-arc metal deflection of beam, cause the strain that distributes according to certain rules along circular arc, the strain at circular arc middle part, can measure by the foil gauge that is affixed on herein, there is accurate corresponding relation in the length variations of it and test specimen, can will carry out acquisition process by the circular-arc beams of metal microdeformation signal that foil gauge is measured by microprocessor, convert the deformation data of experiment slice gauge length to.Measuring principle: connect circular-arc elastic metallic beam about two top bases be directly to be fixed on the test specimen that is stretched by its two edges of a knife and cushion block, about two edges of a knife provide the gauge length of the test specimen that is stretched exactly.Because the vertical line by the edge of a knife by the center of rolling bearing, makes the variation of the gauge length of the test specimen that is stretched equal the chord length of circular-arc elastic metallic beam under the free state by two rolling bearing centers constantly.Here, circular-arc metal foil beam can be thought the thin-walled curved beam, and is always circular-arc in deformation process.Because the variation of circular-arc beams of metal chord length will cause the Thin Walled Curved deflection of beam, make the strain of thin-walled curved beam middle part surface change, this variation can be recorded by foil gauge.There are certain corresponding relation (thin-walled curved beam Deformation Theory) in the strain that is recorded by foil gauge and the chord change of circular-arc beams of metal, can accurately measure the variation of circular-arc metal foil beam chord length by this relation, be the variation of test specimen gauge length, and realize accurately measuring the purpose of large deformation by small deformation.
The effect advantage that the utility model is compared with prior art had: this technology is to utilize small deformation to measure the representative instance of large deformation, and it is wide that it has measurement range, measuring accuracy height, simple operation and other advantages.Compare with traditional foil gauge measuring technique, present technique not only can be measured small strain, also can measure large deformation simultaneously, and need not take the length of test specimen gauge length in large deformation into account; Can adjust the size (radius, central angle) of the thin beam of used circular-arc elastic metallic according to the size of measurement range; Needn't worry to come off and slide and influence the phenomenon of measuring accuracy in response to becoming foil gauge in the excessive traditional measurement method that causes; The foil gauge that the thin beam of circular-arc elastic metallic central authorities are being pasted can be connected with computer data acquisition system, can realize the measurement of high precision continuous acquisition, this measurement to the creep curve of macromolecular material etc. describe most important.
Description of drawings
Fig. 1 is the utility model front elevation (dash area is the A-A section)
Fig. 2 is that the utility model B is to view
Embodiment
The utility model will be further described below in conjunction with accompanying drawing: the purpose of this utility model can be realized by following technical scheme, this strain transducer comprises a sub-folder tool and test specimen and elastic metallic beam 1, and elastic metallic beam 1 two ends are fixed on the axle 5 that can rotate freely.Described elastic metallic beam 1 is circular-arc, and the upper surface of dome posts foil gauge 4.The top base 11 and the bottom base 9 of anchor clamps are equipped with the edge of a knife 3, and two vertical lines crossing the edge of a knife 3 pass through the center of elastic metallic beam 1 two ends rolling bearing 6 respectively.Be provided with cushion block 10 between the plane of anchor clamps and test specimen 2, be provided with PEF film 8 between the plane of cushion block 10 and test specimen 2.Top base 11 has two boss that are provided with rolling bearing 6, and the two ends of described axle 5 cooperate with rolling bearing 6.Two anchor clamps are to be with the bolt of springs 7 directly to be fixed on the test specimen 2 that is stretched by four pieces about circular-arc elastic metallic beam 1, about up and down four edges of a knife 3 provide the gauge length of the test specimen 2 that is stretched exactly, cross the center of the vertical line of the edge of a knife 3 by rolling bearing 6, make the gauge length of the test specimen 2 that is stretched equal chord length by circular-arc elastic metallic beam 1 under the free state at two rolling bearings, 6 centers, this fixed form can guarantee that test specimen variation of gauge length in drawing process is reflected accurately.The two ends of circular-arc beams of metal 1 are fixed on and can rotate freely on the axle 5, the two ends of axle 5 link to each other with the boss of top base 9 respectively by two rolling bearings 6, foil gauge 4 is posted at the middle part of circular-arc beams of metal 1, the variation of the test specimen 2 gauge length length in drawing process that is stretched will cause the chord change of circular-arc beams of metal 1, this variation causes the bending of circular-arc beams of metal 1, cause the strain that distributes according to certain rules along circular arc, the strain at circular arc middle part, can measure by the foil gauge 4 that is affixed on herein, there is accurate corresponding relation in the length variations of it and test specimen, can will carry out acquisition process by the circular-arc beams of metal microdeformation signal that foil gauge 4 is measured by microprocessor, convert the deformation data of experiment slice gauge length to.Measuring principle: connect circular-arc elastic metallic beam 1 about two top bases 9 be that bolt by four pieces of band springs 7 directly is fixed on the edge of a knife 3 and cushion block on the test specimen 2 that is stretched, about four edges of a knife 3 provide the gauge length of the test specimen 2 that is stretched exactly.Because the vertical line by the edge of a knife 3 by the center of rolling bearing 6, makes the variation of the gauge length of the test specimen 2 that is stretched equal chord length by circular-arc elastic metallic beam 1 under the free state at two rolling bearings, 6 centers constantly.Here, circular-arc beams of metal 1 can be thought the thin-walled curved beam, and is always circular-arc in deformation process.Because the variation of circular-arc beams of metal 1 chord length will cause the Thin Walled Curved deflection of beam, make the strain of thin-walled curved beam middle part surface change, this variation can be recorded by foil gauge 4.There are certain corresponding relation (thin-walled curved beam Deformation Theory) in the strain that is recorded by foil gauge 4 and the chord change of circular-arc beams of metal, can accurately measure the variation of circular-arc beams of metal 1 chord length by this relation, be the variation of test specimen gauge length, and realize accurately measuring the purpose of large deformation by small deformation.
As further improvement of the utility model, the strain of test specimen 2 will be measured by the strain of the thin beam 1 of circular-arc elastic metallic, for the accurately strain between reflection test specimen 2 gauge lengths, two edges of a knife 3 at circular-arc beams of metal 1 two ends are fixed on the punctuate at test specimen 2 gauge length two ends exactly, and two vertical lines crossing the edge of a knife 3 obtain measuring to realize the strain of strain energy by circular-arc beams of metal between test specimen 2 gauge lengths by being fixed on axle 5 that circular-arc beams of metal two ends can rotate freely respectively exactly.
As another improvement of the present utility model, only be applicable to that the foil gauge 4 of accurate measurement small deformation will be attached at the central authorities of circular-arc beams of metal 1, be used for accurately measuring the strain of distortion because of test specimen 2 causes circular-arc beams of metal central authorities upper surface, and Thin Walled Curved beam theory by introducing previously, obtain the corresponding relation of this strain and test specimen strain, and obtain high-precision test specimen strain data.This method is typically to utilize small deformation to measure the example of large deformation, is with a wide range of applications and promotional value.
Claims (4)
1. strain transducer, comprise a sub-folder tool and test specimen (2) and beams of metal (1), beams of metal (1) is provided with foil gauge (4), the top base (11) and the bottom base (9) that it is characterized in that anchor clamps are equipped with the edge of a knife (3), be provided with cushion block (10) between the plane of anchor clamps and test specimen (2), beams of metal (1) two ends are fixed on the axle (5) that can rotate freely.
2. a kind of strain transducer according to claim 1 is characterized in that top base (11) has two boss that are provided with rolling bearing (6), and the two ends of described axle (5) cooperate with rolling bearing (6).
3. a kind of strain transducer according to claim 1 is characterized in that two vertical lines of the edge of a knife (3) passed through the center of beams of metal (1) two ends rolling bearings (6) respectively.
4. a kind of strain transducer according to claim 1 is characterized in that described beams of metal (1) is circular-arc, and the upper surface of dome posts foil gauge (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01206862 CN2488046Y (en) | 2001-07-17 | 2001-07-17 | Strain sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01206862 CN2488046Y (en) | 2001-07-17 | 2001-07-17 | Strain sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2488046Y true CN2488046Y (en) | 2002-04-24 |
Family
ID=33627422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01206862 Expired - Fee Related CN2488046Y (en) | 2001-07-17 | 2001-07-17 | Strain sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2488046Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100487415C (en) * | 2004-11-22 | 2009-05-13 | 中国科学院理化技术研究所 | Method for measuring polymer-base foam material elastic modulus by displacement sensor |
| CN106289044A (en) * | 2016-08-11 | 2017-01-04 | 上海脉感科技有限公司 | Sensor stand |
| CN107764649A (en) * | 2017-11-28 | 2018-03-06 | 郑州大学 | Tensile deformation test device and its deformation-sensor fixture in concrete sample high temperature |
| CN108673375A (en) * | 2018-05-25 | 2018-10-19 | 哈尔滨工业大学 | Clamping device for pasting foil gauge on girder structure strain beam |
-
2001
- 2001-07-17 CN CN 01206862 patent/CN2488046Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100487415C (en) * | 2004-11-22 | 2009-05-13 | 中国科学院理化技术研究所 | Method for measuring polymer-base foam material elastic modulus by displacement sensor |
| CN106289044A (en) * | 2016-08-11 | 2017-01-04 | 上海脉感科技有限公司 | Sensor stand |
| CN106289044B (en) * | 2016-08-11 | 2018-12-07 | 上海脉感科技有限公司 | Sensor stand |
| CN107764649A (en) * | 2017-11-28 | 2018-03-06 | 郑州大学 | Tensile deformation test device and its deformation-sensor fixture in concrete sample high temperature |
| CN107764649B (en) * | 2017-11-28 | 2024-01-30 | 郑州大学 | Tensile deformation testing device for concrete test piece at high temperature and deformation sensor clamp thereof |
| CN108673375A (en) * | 2018-05-25 | 2018-10-19 | 哈尔滨工业大学 | Clamping device for pasting foil gauge on girder structure strain beam |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |