CN209311212U - A kind of split hopkinson press bar positioning device suitable for more size test specimens - Google Patents
A kind of split hopkinson press bar positioning device suitable for more size test specimens Download PDFInfo
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- CN209311212U CN209311212U CN201821917982.0U CN201821917982U CN209311212U CN 209311212 U CN209311212 U CN 209311212U CN 201821917982 U CN201821917982 U CN 201821917982U CN 209311212 U CN209311212 U CN 209311212U
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- positioning device
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- 238000012360 testing method Methods 0.000 title claims abstract description 66
- 239000000463 material Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 9
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- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 14
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
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- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 230000035939 shock Effects 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a kind of split hopkinson press bar positioning device suitable for more size test specimens, structure includes removable holding device and side tabs.The removable holding device is made of upper sleeve, lower sleeve, upper sleeve and lower sleeve are connected to become entirety by leaf hinge on one side, it is installed in the end that incident bar is contacted with test specimen when in use, upper and lower sides sleeve is fixed using bolt in another side.The side tabs are placed in lower sleeve, utilize the position of the curved surface positioning test specimen of side tabs, it is ensured that test specimen center and the center of incident bar and transmission bar are point-blank.The utility model structure is simple, can be realized the accurate positionin of test specimen, while having corresponding side tabs matching for various sizes of test specimen, has very strong applicability.Its structure is easily installed and dismantles simultaneously, simple to operate.
Description
Technical field
The utility model relates to the dynamic mechanical testing research fields of material, and in particular to one kind is suitable for more sizes
The split hopkinson press bar positioning device of test specimen.
Background technique
When solving the practical problem on many engineering technology and military technology, people are frequently encountered various impacts, quick-fried
Fried the problem of waiting dynamic loads, mechanical response of most of material under dynamic loads makes a big difference with dead load.In order to
Further mechanical response of the research material under dynamic loads, people have carried out a series of dynamically load instruments since 19th century
Design and improvement.
J.Hopkinson 1872 is using iron wire and drops hammer and completes first impact tension test, and 1914,
B.Hopkinson measures pressure vs time when explosive charge or bullet shooting rod end using Hopkinson compression bar.
1949, Hopkinson compression bar was become separate type first and is used to dynamic force of the research material under high strain-rate by Kolsky
Scholarship and moral conduct is.Formula Hopkinson pressure bar (SHPB) is subsequently isolated to be widely used in the test experiments of material dynamic performance.
The widely used Hopkinson pressure bar experimental system of people is by ballistic projections device, waveform shaper, incidence at present
The compositions such as bar, transmission bar, buffer (generally buffering transmission bar or damping unit etc.), waveform amplifier and digital oscilloscope,
When carrying out material impact compression experiment, test specimen is clamped between incident bar and transmission bar, and subsequent emitter is certain
Ballistic projections will be hit under strike air pressure, incidence wave corresponding with the shock generation of incident rod end surface, incidence wave marches to incident bar
Back wave is generated due to the difference of impedance with when the end face of test specimen, generates transmitted wave in the end face of test specimen and transmission bar.It is incident
Wave, back wave and transmitted wave are pasted onto the foil gauge on incident bar and transmission bar and conducting wire is passed in digital oscilloscope.
One-dimension stress wane hypothesis and test specimen are had to comply with when testing the impact compress performance of test specimen using Hopkinson pressure bar
Both ends of the surface stress equilibrium it is assumed that otherwise test result will not can accurately reflect the dynamic mechanical of test specimen.
Split hopkinson bar experimental technique has been acknowledged as in research material mechanical performance under high strain-rate now
Main, reliable experimental method, the strain rate condition at similar scene, application neck can be simulated using Hopkinson bar
Domain is also extended to a system such as in-site measurement rock, concrete, ceramics, high polymer, composite material from initial metallized metal material
Column new material.
But existing split hopkinson press bar system has the disadvantage that in the actual operation process
It is propped up 1. existing split hopkinson bar is not corresponding after test specimen is placed between incident bar and transmission bar
Support arrangement reduces end and rubs influence to measurement result since test piece end would generally smear the lubricants such as vaseline, because
This test specimen is possible to slide between incident bar and transmission bar before starting test, causes the damage of test specimen.
2. can not accurately realize test specimen center when the diameter of the diameter of test specimen to be measured and Hopkinson pressure bar is not identical
With the coaxial placement at Hopkinson pressure bar center, it is easy to cause the bending of compression bar when carrying out impact test, influences one-dimensional stress
It is that wave is propagated it is assumed that bring error for the measurement of test waveform, reduce the accuracy of test.
Utility model content
The purpose of the utility model is to provide a kind of structures to be simple and convenient to operate, one kind applied widely is suitable for more
The split hopkinson press bar positioning device of size test specimen, with overcome existing split hopkinson press bar experimental rig without
Method provides reliable support for the test specimen being clamped between incident bar and transmission bar, while cannot achieve in test specimen center and compression bar
The heart is coaxially accurately positioned the problem of placement,
In order to achieve the above object, the utility model uses following technical scheme:
A kind of split hopkinson press bar positioning device suitable for more size test specimens, which is characterized in that including removable
The side tabs for unloading formula clamping device and matching with specimen finish and incident bar diameter difference；The detachable clamping dress
It sets and is made of upper sleeve wall, lower sleeve wall, upper sleeve wall is connected by a hinge on one side with lower sleeve wall as whole
Body, another side can be opened and closed as needed and be provided with connection structure；The upper sleeve wall, lower sleeve wall internal diameter with
The diameter of incident bar is equal, and the lower sleeve wall is provided with the support construction for supporting the side tabs；The side
Locating piece, which is provided with, positions arc surface with the face of support construction cooperation and the test specimen contacted with test specimen.
Preferably, upper sleeve wall and lower sleeve wall are semicolumn tubulose in the removable holding device,
One end locating for test specimen, lower sleeve wall protrude from upper sleeve wall and as the support constructions.
Preferably, the thickness of the upper sleeve wall and lower sleeve wall is 1mm, the long 5cm of upper sleeve wall, downside set
The long 7.5cm of barrel.
Preferably, the connection structure includes: to have a flange at the free margins of upper sleeve and lower sleeve respectively, when upper
The flange is parallel to each other when lower sleeve is closed, the screwed hole of two same sizes at upper lower flange same position
Hole is attached for being inserted into bolt.
Preferably, the material of the removable holding device and side tabs is stainless steel.
Preferably, the side tabs are semi-annular shape, and the width along incident bar length direction is 2.5cm, and edge enters
The thickness for penetrating bar radial direction is related with the sample dimensions to match, and thickness=(Hopkinson incidence shank diameter D- test specimen diameter d)/
2。
The beneficial effects of the utility model are embodied in:
1) the removable holding device structure described in is simple, and cost of manufacture is lower, is conducive to produce in batches and promote to make
With.
2) it installs and dismantles, it is easy to operate, while can guarantee the precision of device positioning.
3) positioning requirements of different size test specimens, the scope of application be can satisfy using the side tabs of different radial thickness
Extensively.
4) present apparatus belongs to the auxiliary device except Hopkinson bar test platform, convenient for periodic maintenance and damage it is laggard
Row replacement.
Detailed description of the invention
Fig. 1 is the three dimensional structure diagram of the utility model.
Fig. 2 is the front view of the utility model.
Fig. 3 is the side view of the utility model.
Fig. 4 is the device view of diameter 80mm test specimen.
Fig. 5 is the device view of diameter 75mm test specimen.
Fig. 6 is the device view of diameter 50mm test specimen.
In figure, 1- Hopkinson incident bar, 2- upper sleeve wall, 3- lower sleeve wall, 30- support construction, 4- flange, 5-
Connect bolt, 6- nut, 7- side tabs, 8- test specimen, 9- leaf hinge, transmission bar -10.
Specific embodiment
The utility model is further described with reference to the accompanying drawing.
A kind of split hopkinson press bar positioning device suitable for more size test specimens, as shown in Figure 1, 2, including it is removable
Unload formula clamping device and side tabs 7.The removable holding device is by 3 groups of upper sleeve wall 2, lower sleeve wall
At being semicolumn tubulose, material is stainless steel, the diameter phase of the interior diameter and Hopkinson incident bar 1 of upper and lower sides sleeve wall 3
Together, thickness is 1mm, and upper sleeve wall 2 is 5cm long, this one end locating for test specimen 8 of lower sleeve wall 3, which is equipped with, protrudes from upside set
The support construction 30 of barrel 2, is used to support side tabs 7, and the lower sleeve wall 3 is 7.5cm long.Upper sleeve wall 2 is under
Side sleeve wall 3 is connected to become entirety by leaf hinge 9 on one side, and another side can be opened and closed as needed.
Upper and lower sides sleeve wall is covered in one end that incident bar is contacted with test specimen first when use, so that upper sleeve wall
Right end is overlapped with the right end of incident bar, then closes up upper and lower sides sleeve wall 2,3, makes 4 phase of flange of upper and lower two sides sleeve wall
It is mutually parallel, insertion connection bolt 5, downside tightening nuts 6, thus by upper and lower sides sleeve sleeve on the upside of corresponding two bolts hole
Wall 2,3 is fixed on incident bar 1.
Side tabs 7 be semi-circular shape stainless steel component, outer diameter is identical with the internal diameter of lower sleeve wall 3, as with
The face that the support construction 30 cooperates, inside position arc surface for the test specimen contacted with test specimen.For the test specimen of different-diameter
Used side tabs size is different, and the width along incident bar length direction is 2.5cm, is highly incident shank diameter
Half, thickness is adjusted according to the diameter of test specimen:
As incident shank diameter 100mm, test specimen diameter 80mm, the side tabs with a thickness of 10mm can be used, such as Fig. 3 institute
Show；
As incident shank diameter 100mm, test specimen diameter 75mm, the side tabs with a thickness of 12.5mm, such as Fig. 4 can be used
It is shown；
As incident shank diameter 100mm, test specimen diameter 50mm, the side tabs with a thickness of 25mm can be used, such as Fig. 5 institute
Show；
Corresponding side tabs 7 are put on the end for protruding from upper sleeve wall 2 of lower sleeve 3, and make side
The right side of incident bar 1 is close on the left side of side supporting element, and test specimen 8 is then placed above side tabs, by transmission bar 10 to
Left side promotes so that the left side of transmission bar 10 is close to the right side of test specimen 8, subsequent release nut 6, will connect bolt 5 from
Taken out in screw hole, so that upper and lower sides sleeve and side tabs be taken out from Hopkinson pressure bar device, be clamped at this time into
The test specimen 8 penetrated between bar 1 and transmission bar 10 has been accurately positioned, it is ensured that 8 center of test specimen and incident bar 1,10 center of transmission bar
Point-blank.
The foregoing is merely the structure features of specific embodiment of the utility model, but the utility model to be not limited to
This, in the field of the utility model, made changes or modifications all cover practical new at this any those skilled in the art
Among the protection scope of type.
Claims (6)
1. a kind of split hopkinson press bar positioning device suitable for more size test specimens, which is characterized in that including detachable
Formula clamping device and the side tabs to match with specimen finish and incident bar diameter difference；The removable holding device
It being made of upper sleeve wall, lower sleeve wall, upper sleeve wall and being connected by a hinge on one side for lower sleeve wall become whole,
Another side can be opened and closed as needed and be provided with connection structure；The upper sleeve wall, lower sleeve wall internal diameter with enter
The diameter for penetrating bar is equal, and the lower sleeve wall is provided with the support construction for supporting the side tabs；The side is fixed
Position part, which is provided with, positions arc surface with the face of support construction cooperation and the test specimen contacted with test specimen.
2. a kind of split hopkinson press bar positioning device suitable for more size test specimens according to claim 1,
It is characterized in that, upper sleeve wall and lower sleeve wall are semicolumn tubulose in the removable holding device, in test specimen institute
The one end at place, lower sleeve wall protrude from upper sleeve wall and as the support constructions.
3. a kind of split hopkinson press bar positioning device suitable for more size test specimens according to claim 1,
It is characterized in that, the thickness of the upper sleeve wall and lower sleeve wall is 1mm, the long 5cm of upper sleeve wall, and lower sleeve wall is long
7.5cm。
4. a kind of split hopkinson press bar positioning device suitable for more size test specimens according to claim 1,
It is characterized in that, the connection structure includes: to have a flange at the free margins of upper sleeve and lower sleeve respectively, when upper and lower sides set
The flange is parallel to each other when cylinder closure, and the screwed hole of two same sizes, is used at upper lower flange same position
Insertion bolt is attached.
5. a kind of split hopkinson press bar positioning device suitable for more size test specimens according to claim 1,
It is characterized in that, the material of the removable holding device and side tabs is stainless steel.
6. a kind of split hopkinson press bar positioning device suitable for more size test specimens according to claim 1,
It is characterized in that, the side tabs are semi-annular shape, and the width along incident bar length direction is 2.5cm, along incident bar diameter
To thickness it is related with the sample dimensions to match, thickness=(Hopkinson incidence shank diameter D- test specimen diameter d)/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821917982.0U CN209311212U (en) | 2018-11-21 | 2018-11-21 | A kind of split hopkinson press bar positioning device suitable for more size test specimens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821917982.0U CN209311212U (en) | 2018-11-21 | 2018-11-21 | A kind of split hopkinson press bar positioning device suitable for more size test specimens |
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| Publication Number | Publication Date |
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| CN209311212U true CN209311212U (en) | 2019-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821917982.0U Active CN209311212U (en) | 2018-11-21 | 2018-11-21 | A kind of split hopkinson press bar positioning device suitable for more size test specimens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323919A (en) * | 2018-11-21 | 2019-02-12 | 浙江大学 | A kind of split hopkinson press bar positioning device suitable for more size test specimens |
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2018
- 2018-11-21 CN CN201821917982.0U patent/CN209311212U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323919A (en) * | 2018-11-21 | 2019-02-12 | 浙江大学 | A kind of split hopkinson press bar positioning device suitable for more size test specimens |
| CN109323919B (en) * | 2018-11-21 | 2023-12-29 | 浙江大学 | Separated Hopkinson pressure bar positioning device suitable for multi-size test piece |
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