CN110806445A - Non-contact dynamic method Young modulus measuring experimental instrument - Google Patents
Non-contact dynamic method Young modulus measuring experimental instrument Download PDFInfo
- Publication number
- CN110806445A CN110806445A CN201911137069.8A CN201911137069A CN110806445A CN 110806445 A CN110806445 A CN 110806445A CN 201911137069 A CN201911137069 A CN 201911137069A CN 110806445 A CN110806445 A CN 110806445A
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- vibration
- rod
- test rod
- vertical rods
- contact dynamic
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 58
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 2
- 239000000725 suspension Substances 0.000 abstract description 15
- 230000008878 coupling Effects 0.000 abstract description 9
- 238000010168 coupling process Methods 0.000 abstract description 9
- 238000005859 coupling reaction Methods 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 5
- 238000009774 resonance method Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02827—Elastic parameters, strength or force
Abstract
The invention relates to the field of scientific and educational experimental instruments and discloses a non-contact dynamic method Young modulus measurement experimental instrument which comprises a test rod (1), wherein two ends of the test rod (1) are provided with a circular groove (2) along the circumferential direction; the testing device is characterized in that two first vertical rods (3-1) and two second vertical rods (3-2) which are used for supporting the testing rods (1) are arranged below the testing rods (1), V-shaped knife edges (3) are arranged at the tops of the first vertical rods (3-1) and the second vertical rods (3-2), and the V-shaped knife edges (3) are matched with the circular grooves (2). The support is arranged below the resonant node of the test rod for supporting, so that the support is independent and has no vibration coupling function, the vibration exciter and the vibration pickup are respectively arranged below the test rod and are independent and not interfered with each other, non-contact vibration excitation and vibration pickup are realized, and various defects caused by the conventional suspension wire coupling bending resonance method are overcome.
Description
Technical Field
The invention relates to the field of scientific and educational experimental instruments, in particular to a node-supportable non-contact dynamic method Young modulus measurement experimental instrument.
Background
The dynamic Young modulus (elastic modulus) is an important physical coefficient of an engineering material, which marks the capability of the material to resist elastic deformation, and the common measurement method is a suspension coupling bending resonance method which is a measurement method recommended by national standard GB1586-79, GBT 2105-91.
The method has the advantages of simple structure and brings some problems, when the suspension wire is used for supporting and coupling, for example, when the suspension wire is hung on a resonance node of a test rod, the suspension wire can not couple the energy of a vibration exciter to the test rod, and the suspension wire can not couple the vibration of the test rod to a vibration pickup because the resonance node on the test rod is a non-vibration or minimum-amplitude place. Therefore, in the measurement, the suspension wire is often hung near the node, but the resonance frequency at this time is not the real resonance frequency of the test rod, and the resonance frequency needs to be obtained by extrapolation, and if the suspension wire is not placed at a proper position, an error high-order resonance frequency can be generated.
In the suspension coupling mode, the vibration exciter/vibration pickup is mechanically connected with the test rod through the suspension, and the resonance frequency of the vibration exciter/vibration pickup and the suspension itself can also interfere with the measurement result. Various methods are often required to determine whether the result is a spurious resonance.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a node-supporting non-contact dynamic Young modulus measurement experimental instrument, which solves various defects caused by a conventional suspension coupling bending resonance method in the background art.
The technical scheme is as follows: the invention is realized by adopting the following technical means: a non-contact dynamic method Young modulus measurement experiment instrument comprises a test rod, wherein two ends of the test rod are provided with a circular groove along the circumferential direction of the test rod; two first vertical rods and two second vertical rods for supporting the test rod are arranged below the test rod, V-shaped knife edges are arranged at the tops of the first vertical rods and the second vertical rods, and the V-shaped knife edges are matched with the circular grooves; and a vibration exciter and a vibration pickup are also arranged right below the test rod.
Preferably, the circular groove is arranged at the theoretical node position of the fundamental frequency vibration of the test rod.
Preferably, the depth of the circular groove is 0.2-0.5mm, and the width is 0.2-
0.5mm。
Preferably, the vibration exciter is arranged at the top of the third vertical rod, and the distance between the vibration exciter and the test rod is 0.2-0.5 mm.
Preferably, a buzzer is arranged in the vibration exciter, a conical sound gathering cavity is arranged above a sound outlet hole of the buzzer, and a hole facing the axis of the test rod is arranged at the top of the sound gathering cavity.
Preferably, the diameter of the holes is 0.5-1.5 mm.
Preferably, the vibration pickup is arranged at the top end of the fourth vertical rod, and the distance between the vibration pickup and the test rod is 0.2-0.5 mm.
Preferably, the vibration pickup is cylindrical, and a fiber displacement/vibration sensor is coaxially arranged in the vibration pickup and opposite to the axis of the test rod.
Preferably, the first vertical rod, the second vertical rod, the third vertical rod and the fourth vertical rod are lifting vertical rods, the bottoms of the first vertical rod, the second vertical rod, the third vertical rod and the fourth vertical rod are fixed on the sliding blocks, and the first vertical rod, the second vertical rod, the third vertical rod and the fourth vertical rod are fixed in position through tightening screw hand wheels arranged on one sides.
Preferably, the sliding blocks are movably connected to the base with the graduated scale, and the side faces of the sliding blocks are provided with graduation lines.
The support is arranged below the resonance node of the test rod for supporting, so that the support is independent and has no vibration coupling function, and the vibration exciter and the vibration pickup are respectively arranged below the test rod and are independent and do not interfere with each other; the vibration exciter only excites the test rod to generate vibration and is not mechanically connected with the test rod; the vibration pickup only receives the vibration signal of the test rod and is not mechanically connected with the test rod. The invention realizes non-contact vibration excitation and vibration pickup, overcomes various defects brought by the conventional suspension wire coupling bending resonance method, and has more accurate test result.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a first vertical rod and a second vertical rod;
FIG. 3 is a schematic view of a vibration exciter;
FIG. 4 is a structural diagram of a vibration pickup;
fig. 5 is a top view of the fiber optic displacement/vibration sensor.
Reference numerals: 1-test bar, 2-circular groove, 3-V type knife edge, 3-1-first upright rod, 3-2-second upright rod, 3-3-third upright rod, 3-4-fourth upright rod, 4-vibration exciter, 4-1-buzzer, 4-2-sound gathering cavity, 4-3-hole, 5-vibration pick-up, 5-1-optical fiber displacement/vibration sensor, 5-2-emission optical fiber, 5-3-receiving optical fiber, 6-slide block, 7-tightening screw hand wheel, 8-base and 9-graduation line.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "upper", "lower",
front, back, left, right, top, bottom, inner,
The references to "outer" and the like are based on the orientation or positional relationship shown in the drawings and are only for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The test bars of the present invention may be metallic, such as steel, stainless steel, copper, aluminum, etc., or non-metallic, such as glass, ceramic, graphite, etc.
Example (b):
referring to fig. 1, a non-contact dynamic young's modulus measuring tester comprises a testing rod 1, wherein two ends of the testing rod 1 are provided with a circular groove 2 along the circumferential direction, the circular groove 2 is arranged at the theoretical node position of the fundamental frequency vibration of the testing rod, specifically, at the position 0.224L away from the end point of the testing rod, wherein L is the total length of the testing rod, and the node position is known in the art. The depth of the circular groove 2 is 0.2-0.5mm, and the width is 0.2-0.5 mm.
Two first vertical rods 3-1 and two second vertical rods 3-2 for supporting the test rod 1 are arranged below the circular grooves on the two sides of the test rod 1, V-shaped tool mouths 3 are arranged at the tops of the first vertical rods 3-1 and the second vertical rods 3-2, and when the test rod is placed on the vertical rods, the circular grooves 2 just fall on the V-shaped tool mouths 3, as shown in figure 2, the V-shaped tool mouths 3 are matched with the circular grooves 2.
A third upright rod 3-3 and a fourth upright rod 3-4 are arranged between the first upright rod 3-1 and the second upright rod 3-2, in the invention, a vibration exciter 4 is arranged at the top of the third upright rod 3-3, as shown in figure 3, the distance between the top of the vibration exciter 4 and the test rod is 0.2-0.5mm, a buzzer 4-1 is arranged in the vibration exciter 4, a conical sound gathering cavity 4-2 is arranged above a sound outlet of the buzzer 4-1, a hole 4-3 is arranged at the top of the sound gathering cavity 4-2 and is right opposite to the axis of the test rod 1, and the diameter of the hole is 0.5-1.5 mm.
A fourth vertical rod 3-4 is arranged between the third vertical rod 3-3 and the second vertical rod 3-2, a vibration pickup 5 is arranged at the top of the vertical rod, as shown in fig. 4, the distance between the vibration pickup 5 and the test rod 1 is 0.2-0.5mm, specifically, the vibration pickup 5 is cylindrical, an optical fiber displacement/vibration sensor 5-1 facing the axis of the test rod 1 is coaxially arranged in the vibration pickup 5, an emitting optical fiber 5-2 for emitting laser is arranged at the axial position of the optical fiber displacement/vibration sensor 5-1, at least three receiving optical fibers 5-3 for receiving reflected light are arranged in the surrounding array, and when the test rod 1 vibrates near the top surface of the sensor, the sensor can output vibration amplitude and vibration frequency signals for measurement.
The first upright stanchion 3-1, the second upright stanchion 3-2, the third upright stanchion 3-3 and the fourth upright stanchion 3-4 are all liftable upright stanchions, and are fixed in position by a tightening screw handwheel 7 arranged at one side. The bottom of each pole setting is all fixed on slider 6, and slider 6 all can be linear motion along base 8, and base 8 has the scale, and slider 6 side all is equipped with scale mark 9, can find out the position of slider directly perceivedly.
The invention changes the traditional suspension wire mode, puts the test rod on the upright post through the node position, and makes the vibration excitation and the vibration pickup independent from each other, and has no mechanical contact with the test rod, thereby overcoming various defects brought by the traditional suspension wire coupling bending resonance method.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a non-contact dynamic method Young's modulus measurement experiment appearance, includes test bar (1), its characterized in that: two ends of the test rod (1) are provided with a circular groove (2) along the circumferential direction; two first vertical rods (3-1) and two second vertical rods (3-2) for supporting the test rod (1) are arranged below the test rod (1), V-shaped knife edges (3) are arranged at the tops of the first vertical rods (3-1) and the second vertical rods (3-2), and the V-shaped knife edges (3) are matched with the circular grooves (2); a vibration exciter (4) and a vibration pickup (5) are also arranged right below the test rod (1).
2. The non-contact dynamic young's modulus measuring tester as claimed in claim 1, wherein: the circular groove (2) is arranged at the theoretical node position of the fundamental frequency vibration of the test rod.
3. The non-contact dynamic young's modulus measuring tester as claimed in claim 2, wherein: the depth of the circular groove (2) is 0.2-0.5mm, and the width is 0.2-0.5 mm.
4. The non-contact dynamic young's modulus measuring tester as claimed in claim 2, wherein: the vibration exciter (4) is arranged at the top of the third upright stanchion (3-3), and the distance between the vibration exciter and the test rod is 0.2-0.5 mm.
5. The non-contact dynamic method young's modulus measurement tester as claimed in claim 4, wherein: a buzzer (4-1) is arranged in the vibration exciter (4), a conical sound gathering cavity (4-2) is arranged above a sound outlet of the buzzer (4-1), and a hole (4-3) which is opposite to the axis of the test rod (1) is arranged at the top of the sound gathering cavity (4-2).
6. The non-contact dynamic method young's modulus measurement tester as claimed in claim 5, wherein: the diameter of the hole is 0.5-1.5 mm.
7. The non-contact dynamic young's modulus measuring tester as claimed in claim 2, wherein: the vibration pickup (5) is arranged at the top end of the fourth vertical rod (3-4), and the distance between the vibration pickup and the test rod (1) is 0.2-0.5 mm.
8. The non-contact dynamic young's modulus measuring tester as claimed in claim 7, wherein: the vibration pickup (5) is cylindrical, and an optical fiber displacement/vibration sensor (5-1) which is right opposite to the axis of the test rod (1) is coaxially arranged in the vibration pickup.
9. The non-contact dynamic young's modulus measurement tester as claimed in any one of claims 1 to 8, wherein: the first vertical rod (3-1), the second vertical rod (3-2), the third vertical rod (3-3) and the fourth vertical rod (3-4) are lifting vertical rods, the bottoms of the lifting vertical rods are fixed on the sliding block (6), and the lifting vertical rods are fixed in position through a tightening screw hand wheel (7) arranged on one side.
10. The non-contact dynamic young's modulus measuring tester as claimed in claim 9, wherein: the slide block (6) is movably connected to the base (8) with the graduated scale, and the side face of the slide block (6) is provided with graduation lines (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911137069.8A CN110806445A (en) | 2019-11-19 | 2019-11-19 | Non-contact dynamic method Young modulus measuring experimental instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911137069.8A CN110806445A (en) | 2019-11-19 | 2019-11-19 | Non-contact dynamic method Young modulus measuring experimental instrument |
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| Publication Number | Publication Date |
|---|---|
| CN110806445A true CN110806445A (en) | 2020-02-18 |
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| CN201911137069.8A Pending CN110806445A (en) | 2019-11-19 | 2019-11-19 | Non-contact dynamic method Young modulus measuring experimental instrument |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1350546A1 (en) * | 1985-12-02 | 1987-11-07 | Акустический институт им.акад.Н.Н.Андреева | Method of determining youngъs complex modulus of soft viscoelastic materials |
| JPS63250548A (en) * | 1987-04-06 | 1988-10-18 | Osaka Pref Gov | Method and instrument for measuring loss coefficient, dynamic modulus of elasticity, dynamic modulus of elasticity in shear and dynamic poisson's ratio of bar material of sheet material |
| CN2700865Y (en) * | 2004-06-14 | 2005-05-18 | 蔡云良 | Support type multifunctional dynamic Young's modulus and vibration analyzer |
| CN106248500A (en) * | 2016-06-17 | 2016-12-21 | 田凯 | The beam deflection method utilizing covibration surveys experimental provision and the method for Young's modulus |
| CN106248798A (en) * | 2016-06-17 | 2016-12-21 | 田凯 | A kind of hang wire flexural resonance method surveys experimental provision and the method for Young's modulus |
| CN211318306U (en) * | 2019-11-19 | 2020-08-21 | 南京浪博科教仪器有限公司 | Non-contact dynamic method Young modulus measuring experimental instrument |
-
2019
- 2019-11-19 CN CN201911137069.8A patent/CN110806445A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1350546A1 (en) * | 1985-12-02 | 1987-11-07 | Акустический институт им.акад.Н.Н.Андреева | Method of determining youngъs complex modulus of soft viscoelastic materials |
| JPS63250548A (en) * | 1987-04-06 | 1988-10-18 | Osaka Pref Gov | Method and instrument for measuring loss coefficient, dynamic modulus of elasticity, dynamic modulus of elasticity in shear and dynamic poisson's ratio of bar material of sheet material |
| CN2700865Y (en) * | 2004-06-14 | 2005-05-18 | 蔡云良 | Support type multifunctional dynamic Young's modulus and vibration analyzer |
| CN106248500A (en) * | 2016-06-17 | 2016-12-21 | 田凯 | The beam deflection method utilizing covibration surveys experimental provision and the method for Young's modulus |
| CN106248798A (en) * | 2016-06-17 | 2016-12-21 | 田凯 | A kind of hang wire flexural resonance method surveys experimental provision and the method for Young's modulus |
| CN211318306U (en) * | 2019-11-19 | 2020-08-21 | 南京浪博科教仪器有限公司 | Non-contact dynamic method Young modulus measuring experimental instrument |
Non-Patent Citations (2)
| Title |
|---|
| 张莎 等: "动态杨氏模量仪的功能扩展", 电子技术与软件工程, no. 21, 9 November 2018 (2018-11-09) * |
| 闵爱琳;: "动态法测量固体材料的杨氏模量", 武汉工业学院学报, no. 02, 15 June 2008 (2008-06-15) * |
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