CN201340368Y - Dynamic frictional coefficient tester - Google Patents
Dynamic frictional coefficient tester Download PDFInfo
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- CN201340368Y CN201340368Y CNU200920063066XU CN200920063066U CN201340368Y CN 201340368 Y CN201340368 Y CN 201340368Y CN U200920063066X U CNU200920063066X U CN U200920063066XU CN 200920063066 U CN200920063066 U CN 200920063066U CN 201340368 Y CN201340368 Y CN 201340368Y
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Abstract
The utility model provides a dynamic frictional coefficient tester with simple structure. The tester consists of a trip rod, a loading incident rod, two loading transmission rods, two shearing stress meters, two resistance strain gages and two metal gaskets, wherein one end of the trip rod is the cylindrical rod with smooth plane; the loading incident rod is the cylindrical rod with the diameter being same with the trip rod, the impact surface of the loading incident rod corresponding to the trip rod is the smooth plane, and the other end of the loading incident rod takes the protruding wedge shape; the two identical loading transmission rods are the cylindrical rods, and one end of the loading transmission rod is the smooth plane on which the shearing stress meter is stuck; the metal gasket is stuck on the shearing stress meter; and the resistance strain gages are stuck on the surface of the middle segment of the loading transmission rod. By sticking samples with different materials and combining and changing the samples, the dynamic frictional coefficient tester can test the dynamic frictional coefficient between different materials.
Description
Technical field
The utility model relates to the device of dynamic friction coefficient between a kind of test material, especially tests the instrument of the dynamic friction coefficient between low-intensity material.
Background technology
Along with the fast development of space flight, war industry etc., the existing dynamic friction experiments of measuring device of the friction effect between solid material comes into one's own and studies.Impact the important directions that the friction effect of material is studied especially under loading.The storeroom Study on Friction Properties lacks effective laboratory facilities under the loading yet impact. mainly comprises two classes:the first kind is such as document [Rajagopalan; V.Prakash.A ModifiedTorsional Kolsky Bar for Investigating Dynamic Friction.ExperimentalMechanics.39 (4): 295-303 (1999). and H.D.Espinosa, A.Patanella and M.Fischer.A Novel Dynamic Friction Experiment Using a Modified Kolsky BarApparatus.Experimental Mechanics.40 (2): 138-153 (2000) .] in relate to pass through to improve the dynamic friction experimental provision that the Hopkinson torsion bar is set up. When utilizing this device to test, requiring specimen shape is the light wall pipe shape, and there is certain degree of difficulty in the processing of sample, especially for the lower material of intensity, is difficult to be processed into light wall pipe shape sample and carries out the test of the dynamic friction coefficient of storeroom.Simultaneously, because when utilizing this device to test, the wave of compression velocity of propagation is faster than torsional wave in the sample, therefore before experiment effectively loads, compression-loaded has acted on sample, for the hard brittle material sample surface breakdown may take place, the frictional behaviour of Huo Deing not is an original material mantle friction operating mode like this, and the validity of experimental result is damaged; Second class is as document [V.Prakash, R.Clifton.Time ResolvedDynamic Friction Measurement in Pressure-shear.Experimental Mechanics.35:329-336 (1995). with H.D.Espinosa, M.Mello, Y.Xu.A Variable SensitivityDisplacement Interferometer with Application to Wave Propagation Experiments.J.Appl.Mech.64:123-131 (1997) .] in related foundation based on the dynamic friction coefficient measurement mechanism of angular impact experiment, this device utilizes the elastic linear ripple to simplify and analyzes and explain experimental result.But, utilize the experiment test process of this class device loaded down with trivial details and complicated.Simultaneously, because very high to the compression-loaded intensity of sample, low-intensity material and hard brittle material are not suitable for this kind device.
Summary of the invention
The technical problems to be solved in the utility model provide a kind of can the Validity Test dynamic load under the proving installation of storeroom friction factor.This device is simple to operate, and it is long and do not destroy the characteristics of specimen surface operating mode to have effective load time, and test result can reflect the situation of change of friction factor under the loading environment in real time.
Dynamic friction coefficient tester of the present utility model loads incident bar by drop bar, and two load transmission bar, two shear stress meters, and two sheet resistance foil gauges, two metallic gaskets are formed.Drop bar is that an end is the cylindrical bar of smooth flat, and this smooth flat end loads incident bar as bump end bump.Loading incident bar is the diameter cylindrical bar identical with drop bar, and the striking face corresponding with drop bar is smooth flat, and the other end is outstanding wedge shape, two planes of outstanding wedge shape respectively with the axial angle at 45 of loading incident bar.Two identical loading transmission bars are cylindrical bar, and diameter is less than the diameter that loads the incident bar cleat planes; An end that loads transmission bar is a smooth flat, is pasted with the shear stress meter on this smooth flat, is pasted with metallic gasket above the shear stress meter.The surface that loads the transmission bar stage casing is pasted with resistance strain gage.
During test, the sample to be tested assembly is made up of two bulk specimens and two small samples, the shape of large and small sample is cylindrical, the bulk specimen diameter is less than loading incident bar cleat planes diameter, the small sample diameter is less than the bulk specimen diameter, and two bulk specimens are bonding respectively with two planes that load the incident bar wedge shape, and two small samples stick on respectively on two metallic gaskets, after surface of contact between the big small sample requires to carry out the different roughness processing according to friction testing, closely contact naturally.
The utility model can be obtained following beneficial effect:
This apparatus structure is simple.By stickup different materials sample, and carry out corresponding sample combination and variation, can realize the dynamic friction coefficient test between different materials.Directly by friction factor is obtained in the test of pressure and friction force, reliability is relatively good.Detected materials is not had particular restriction, can test as long as can be processed into big small sample assembly.Especially this device can be realized lower rate of loading by the speed of adjusting drop bar, is unlikely to make detected materials to damage, and therefore can be widely used in the dynamic friction coefficient test between various strength materials.
Description of drawings
Configuration state synoptic diagram when Fig. 1 is to use the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is specifically described.
As shown in Figure 1, the utility model is loaded incident bar 2, the first and is loaded the transmission bar 3 and the second loading transmission bar 4 by drop bar 1, shear stress meter 5, and resistance strain gage 6, metallic gasket 7 is formed.Drop bar 1 is a cylindrical bar, and an end is that smooth flat is as striking face.Loading incident bar 2 is and the identical cylindrical bar of drop bar 1 diameter, an end be smooth flat as striking face, the other end is outstanding lozenges, two planes forming wedge shape respectively with the angle axial at 45 that loads incident bar 2.It is identical cylindrical bar that the first loading transmission bar 3 and second loads transmission bar 4, the diameter of cylinder is less than the cleat planes diameter that loads incident bar 2, first end that loads the transmission bar 3 and the second loading transmission bar 4 is smooth flat, is pasted with shear stress meter 5 above respectively.Be pasted with metallic gasket 7 above the shear stress meter 5.Be pasted with resistance strain gage 6 respectively at first middle part that loads the transmission bar 3 and the second loading transmission bar 4.Sample to be tested assembly 10 is made up of two bulk specimens 8 and two small samples 9.The shape of large and small sample is cylindrical, and the diameter of bulk specimen 8 is less than loading incident bar 2 cleat planes diameters, and the diameter of small sample 9 is less than the diameter of bulk specimen 8.Two bulk specimens 8 are bonding respectively with two planes that load incident bar 2 wedge shapes, and two small samples 9 are bonding respectively with first metallic gasket 7 that loads on the transmission bar 3 and the second loading transmission bar 4 respectively, connect by the friction test request between bulk specimen 8 and the small sample 9.
The shear stress meter is a conducting resinl with the cementing agent that loads transmission bar and metallic gasket bonding.Resistance strain gage is an epoxy glue with the bonding agent that loads the transmission bar surface.
Bulk specimen use shock-resistant gluing be affixed on to be loaded into penetrate the bar lozenges, small sample also uses the shock-resistant gluing metallic gasket that is affixed on.
When using the utility model, will load incident bar 2 and first and load transmission bar 3 and second and load transmission bar 4 and be fixed in same surface level, the test request connection is wiped in big small sample massage.Drop bar 1 coaxial bump loads incident bar 2 and produces load pulses.Load pulses is decomposed when arriving sample assembly 10 interfaces, after sample assembly 10 is compressed and shears, imports a compression pulse and a shear pulse respectively into to the first loading transmission bar 3 and the second loading transmission bar 4.
Because two loading transmission bars are identical, the compression pulse that imports into is also identical with the shear pulse effect, therefore only analyzes first acting force that loads on the transmission bar 3 and gets final product.
The pressure N that acts on sample assembly 10 interfaces obtains by sticking on first resistance strain gage 6 that loads on the transmission bar 3, and the result is:
N=A
tε
TpE (formula one)
Wherein, ε
TpBe the transmission compressive strain signal that resistance strain gage 6 obtains, A
tBe the cross-sectional area of the first loading transmission bar 3, E is the elastic modulus of the first loading transmission bar 3.
Shearing force Γ on sample assembly 10 interfaces is obtained by shear stress meter 5:
Γ=τ A
t(formula two)
τ is the shear stress that shear stress meter 5 test obtains, and shearing force Γ is fricative by between the sample material, according to Coulomb friction theory:
Γ=μ N (formula three)
In the formula three, μ is a friction factor.Can get by above-mentioned formula:
μ=Γ/N=τ A/A
tε
TpE (formula four)
So, utilize the first dynamic change history that loads the shear stress τ that the shear stress meter 5 on the transmission bar 3 obtains, utilize first to load institute's resistance strain gage that pastes 6 acquisition transmission compressive strain ε on the transmission bar 3
TpHistorical over time, utilize formula four, finally obtain the change histories of dynamic friction coefficient μ between two samples.
The utility model is linked to each other with the test acquisition system, can obtain dynamic friction coefficient μ curve.
Claims (4)
1. a dynamic friction coefficient tester is characterized in that, by drop bar (1), loads incident bar (2), and two load transmission bar, two shear stress meters (5), and two sheet resistance foil gauges (6), two metallic gaskets (7) are formed; Drop bar (1) is that an end is the cylindrical bar of smooth flat, and this smooth flat end loads incident bar (2) as bump end bump; Loading incident bar (2) is diameter and the identical cylindrical bar of drop bar (1), and the striking face corresponding with drop bar (1) is smooth flat, and the other end is outstanding wedge shape, two planes of giving prominence to wedge shape respectively with the axial angle at 45 of loading incident bar (2); Two identical loading transmission bars are cylindrical bar, and diameter is less than the diameter that loads incident bar (2) cleat planes; An end that loads transmission bar is a smooth flat, is pasted with shear stress meter (5) on this smooth flat, is pasted with metallic gasket (7) above the shear stress meter (5); The surface that loads the transmission bar stage casing is pasted with resistance strain gage (6).
2. dynamic friction coefficient tester according to claim 1, it is characterized in that the sample to be tested assembly (10) that uses is made up of two bulk specimens (8) and two small samples (9), the shape of bulk specimen (8) and small sample (9) is cylindrical, bulk specimen (8) diameter is less than loading incident bar (2) cleat planes diameter, small sample (9) diameter is less than bulk specimen (8) diameter, two bulk specimens (8) are bonding respectively with two planes that load incident bar (2) one end wedge shapes, and two small samples (9) stick on respectively on two metallic gaskets (7).
3. dynamic friction coefficient tester according to claim 1 and 2 is characterized in that shear stress meter (5) and the cementing agent that loads transmission bar and metallic gasket (7) bonding are conducting resinl; Resistance strain gage (6) is an epoxy glue with the bonding agent that loads the transmission bar surface.
4. according to claim 1,2 or 3 described dynamic friction coefficient testers, it is characterized in that bulk specimen (8) uses shock-resistant gluing being affixed on to be loaded into the plane of penetrating bar (2) wedge shape, small sample (9) uses the shock-resistant gluing metallic gasket (7) that is affixed on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920063066XU CN201340368Y (en) | 2009-01-22 | 2009-01-22 | Dynamic frictional coefficient tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200920063066XU CN201340368Y (en) | 2009-01-22 | 2009-01-22 | Dynamic frictional coefficient tester |
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| Publication Number | Publication Date |
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| CN201340368Y true CN201340368Y (en) | 2009-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU200920063066XU Expired - Fee Related CN201340368Y (en) | 2009-01-22 | 2009-01-22 | Dynamic frictional coefficient tester |
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| CN (1) | CN201340368Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169069A (en) * | 2011-05-30 | 2011-08-31 | 浣石 | Three-dimensional impact loading experiment device |
| CN101769837B (en) * | 2010-01-06 | 2012-12-05 | 宁波大学 | Dynamic compression experimental method of Hopkinson pressure bar |
| CN103743668A (en) * | 2014-01-29 | 2014-04-23 | 中国矿业大学 | Device and method for testing lateral impact friction |
| CN103760101A (en) * | 2014-01-29 | 2014-04-30 | 中国矿业大学 | Front side impact friction testing device and testing method |
| CN104198307A (en) * | 2014-09-03 | 2014-12-10 | 安徽理工大学 | Integrated dynamic one-way compression-shear stress-strain testing device |
| CN104266962A (en) * | 2014-10-15 | 2015-01-07 | 中国人民解放军国防科学技术大学 | Device for testing safety performance of explosive under impact and friction conditions |
| CN107702979A (en) * | 2017-10-25 | 2018-02-16 | 哈尔滨理工大学 | One kind is used for Hopkinson pressure bar experiment foil gauge stiffening device |
| CN109900407A (en) * | 2019-03-19 | 2019-06-18 | 中国林业科学研究院木材工业研究所 | The measuring device and method of frictional force when high-speed cutting between tool surface and timber |
-
2009
- 2009-01-22 CN CNU200920063066XU patent/CN201340368Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769837B (en) * | 2010-01-06 | 2012-12-05 | 宁波大学 | Dynamic compression experimental method of Hopkinson pressure bar |
| CN102169069A (en) * | 2011-05-30 | 2011-08-31 | 浣石 | Three-dimensional impact loading experiment device |
| CN102169069B (en) * | 2011-05-30 | 2012-09-05 | 浣石 | Three-dimensional impact loading experiment device |
| CN103743668A (en) * | 2014-01-29 | 2014-04-23 | 中国矿业大学 | Device and method for testing lateral impact friction |
| CN103760101A (en) * | 2014-01-29 | 2014-04-30 | 中国矿业大学 | Front side impact friction testing device and testing method |
| CN103743668B (en) * | 2014-01-29 | 2016-08-17 | 中国矿业大学 | Side impact friction testing device and testing method |
| CN104198307A (en) * | 2014-09-03 | 2014-12-10 | 安徽理工大学 | Integrated dynamic one-way compression-shear stress-strain testing device |
| CN104266962A (en) * | 2014-10-15 | 2015-01-07 | 中国人民解放军国防科学技术大学 | Device for testing safety performance of explosive under impact and friction conditions |
| CN107702979A (en) * | 2017-10-25 | 2018-02-16 | 哈尔滨理工大学 | One kind is used for Hopkinson pressure bar experiment foil gauge stiffening device |
| CN109900407A (en) * | 2019-03-19 | 2019-06-18 | 中国林业科学研究院木材工业研究所 | The measuring device and method of frictional force when high-speed cutting between tool surface and timber |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091104 Termination date: 20110122 |