CN108489796A - A kind of method that dynamic measures material modulus - Google Patents
A kind of method that dynamic measures material modulus Download PDFInfo
- Publication number
- CN108489796A CN108489796A CN201810253855.3A CN201810253855A CN108489796A CN 108489796 A CN108489796 A CN 108489796A CN 201810253855 A CN201810253855 A CN 201810253855A CN 108489796 A CN108489796 A CN 108489796A
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- sample
- modulus
- speed
- annular shape
- supporting plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of methods that dynamic measures material modulus, include the following steps：(1) circular sample is made in detected materials；(2) by circular sample around its center of circle from static rotation to high speed, the internal diameter r of annular shape sample when then measuring static, the internal diameter R and rotational speed omega of annular shape sample when high speed rotation；(3) pass through formulaModulus E is calculated, wherein ρ is the density of detected materials.Compared with prior art, the present invention makes ring be deformed under the action of the centrifugal force using loop configuration during without constraint high-speed cruising, and its deformation values is measured in high-speed cruising boosting velocity procedure, derivation calculating is carried out by formula, can obtain the modulus value of practical structures material, method simply, conveniently, directly, without external force constraint.
Description
Technical field
The present invention relates to material property field of measuring technique, and in particular to a kind of method that dynamic measures material modulus.
Background technology
Modulus is one of basic performance of material, is measurement parameter during investigation of materials.The measurement of usual modulus is quiet
Load effect is lower to carry out stress-strain curve of tensile measurement, obtains the modulus of material.Promise is then passed through for the loop configuration of making
That ring or explosion bulge test measure.Above-mentioned modulus measurement method measures in static test.But many materials are when in use
It is to be in high-speed motion, so the data that static test measures can not real embodiment material modulus.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of dynamics to measure material
The method of modulus.
The purpose of the present invention can be achieved through the following technical solutions：A kind of method that dynamic measures material modulus,
It is characterized in that, this approach includes the following steps：
(1) circular sample is made in detected materials；
(2) circular sample is rotated from static to high speed around its center of circle, annular shape sample when then measuring static
Internal diameter r, the internal diameter R and rotational speed omega of annular shape sample when high speed rotation；
(3) pass through formulaModulus E is calculated, wherein ρ is the density of detected materials.
The rotation of the annular shape sample realizes that the high-speed rotating system includes the electricity of bottom by high-speed rotating system
Machine, the supporting plate being connect with the shaft of motor, the shaft of the motor are located at the axle center of supporting plate, the axle center of the annular shape sample and
The axle center of supporting plate overlaps.It is no restrained condition that the setting, which enables to circular sample in the horizontal direction, only in frictional force
Under the action of, with supporting plate high speed rotation, and ensure that the center of circle of rotation is exactly the axle center of circular sample just.Supporting plate has fixed
Bit architecture can guarantee that ring puts down rear supporting plate and overlapped with the axle center of sample.
The annular shape sample and supporting plate are in vacuum tank, and vacuum state is to ensure that sample does not have in sample rotation
Have resistance, it can be achieved that high-speed cruising purpose.
The high-speed rotating system includes tachometer of measuring for measuring circular sample rotation rate and for measuring circle
The displacement measuring device of ring-shaped sample internal diameter.
Institute's displacement measurement device is raster pattern displacement measuring device.
The high-speed rotating speed is 1800~150000 turns/min.
Compared with prior art, beneficial effects of the present invention are embodied in：By high-speed rotating system to circular sample
Dynamic operation accelerates ring with continuous raising speed method, is rising in the case where not damaging test specimen and applying any external force to it
Ring is measured in real time while fast, by ring in operation measure displacement variable, deformation measurement realizes cyclic annular knot
The modulus of structure material measures, this method simply, conveniently, directly, without external force constraint, provide a kind of new modulus measurement method.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Wherein, 1 is vacuum tank, and 2 be circular sample, and 3 be supporting plate, and 4 be motor, and 5 be displacement measuring device, and 6 be to turn
Fast measuring instrument.
Specific implementation mode
It elaborates below to the embodiment of the present invention, the present embodiment is carried out lower based on the technical solution of the present invention
Implement, gives detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment 1
A kind of method that dynamic measures material modulus passes through the deformation measurement during experiment and the reason under centrifugation force effect
The method to measure material modulus is combined by formula.It includes the following steps：
1) as shown in Figure 1：Detected materials are fabricated to circular sample 2, are placed on supporting plate 3, and ensure circular sample 2
It is overlapped with the axle center of supporting plate 3, utilizes the frictional force between circular sample 2 and supporting plate 3, it is ensured that circular sample 2 is synchronous with supporting plate 3
Operation；Motor 4 drives supporting plate 3 in 1 raising speed of vacuum tank and gradually rises to high speed, and supporting plate 3 is synchronous with circular sample 2 at this time rises
To high speed.
2) in running with tachometer of measuring 6 and displacement measuring device 5 synchronize measure the change of 2 internal diameter of rotating speed and circular sample
Change, records related data.
3) by being deformed and speed curves binding isotherm formula under different rotating speedsObtain annulation
The modulus of body material.
The modulus test of aluminum alloy materials is carried out by the above method, data are as follows：Ring-shaped sample is made in alloy material,
Radius is 0.065m, and the radius deflection 1.04E-4m under the speed of 3141.6m/s, density 2700Kg/m are measured in experiment3, root
Modulus is calculated according to above-mentioned test data.
E=2700*3141.62*0.0653/(1.04*10-4)=70.4GPa
By static modulus test method, the modulus of the aluminum alloy materials is 70.2GPa, is compared it is found that this method measures
Modulus and static method measured result it is close, but since this method is to measure in a dynamic state, the application with the aluminum alloy materials
Therefore occasion relative to static modulus more closely, measure, the method for the present invention confidence level higher.
It improves under rotating speed to the speed of 3770m/s, radial deformation amount 1.50E-4m, depanning is calculated according to above-mentioned test data
Amount.
E=2700*37702*0.0653/(1.5*10-4)-3=70.3GPa, modulus test result are held essentially constant.
Claims (6)
1. a kind of method that dynamic measures material modulus, which is characterized in that this approach includes the following steps：
(1) circular sample is made in detected materials；
(2) circular sample is rotated from static to high speed around its center of circle, the internal diameter of annular shape sample when then measuring static
R, the internal diameter R and rotational speed omega of annular shape sample when high speed rotation；
(3) pass through formulaModulus E is calculated, wherein ρ is the density of detected materials.
2. the method that a kind of dynamic according to claim 1 measures material modulus, which is characterized in that the annular shape sample
Rotation realize that the high-speed rotating system includes the motor of bottom, connect with the shaft of motor by high-speed rotating system
Supporting plate, the shaft of the motor are located at the axle center of supporting plate, and the axle center of the annular shape sample and the axle center of supporting plate overlap.
3. the method that a kind of dynamic according to claim 2 measures material modulus, which is characterized in that when test, the circle
Ring-shaped sample and supporting plate are in vacuum tank.
4. the method that a kind of dynamic according to claim 2 measures material modulus, which is characterized in that the high speed rotation system
System includes the tachometer of measuring for measuring circular sample rotation rate and the displacement measurement for measuring circular sample internal diameter
Device.
5. the method that a kind of dynamic according to claim 4 measures material modulus, which is characterized in that institute's displacement measurement dress
It is set to raster pattern displacement measuring device.
6. the method that a kind of dynamic according to claim 1 measures material modulus, which is characterized in that described high-speed rotating
Speed is 1800~150000 turns/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810253855.3A CN108489796A (en) | 2018-03-26 | 2018-03-26 | A kind of method that dynamic measures material modulus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810253855.3A CN108489796A (en) | 2018-03-26 | 2018-03-26 | A kind of method that dynamic measures material modulus |
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| Publication Number | Publication Date |
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| CN108489796A true CN108489796A (en) | 2018-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810253855.3A Pending CN108489796A (en) | 2018-03-26 | 2018-03-26 | A kind of method that dynamic measures material modulus |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5115673A (en) * | 1990-07-20 | 1992-05-26 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | Non-destructive method for determining elastic moduli of material |
| CN105203414A (en) * | 2015-09-24 | 2015-12-30 | 长沙理工大学 | Testing method for dynamic modulus of bituminous mixture |
-
2018
- 2018-03-26 CN CN201810253855.3A patent/CN108489796A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5115673A (en) * | 1990-07-20 | 1992-05-26 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | Non-destructive method for determining elastic moduli of material |
| CN105203414A (en) * | 2015-09-24 | 2015-12-30 | 长沙理工大学 | Testing method for dynamic modulus of bituminous mixture |
Non-Patent Citations (4)
| Title |
|---|
| G.J. NIE ET AL.: "Stress analysis and material tailoring in isotropic linear thermoelasticStress analysis and material tailoring in isotropic linear thermoelastic incompressible functionally graded rotating disks of variable thickness", 《COMPOSITE STRUCTURES》 * |
| 徐启圣等: "《刚体运动力学》", 31 January 2017, 中国科学技术大学出版社 * |
| 李东平等: "《材料力学》", 31 December 2015, 华南理工大学出版社 * |
| 王龙等: "动态法测量杨氏模量的理论分析与Ｍatlab辅助研究", 《大学物理》 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180904 |
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| RJ01 | Rejection of invention patent application after publication |