CN109342222A - Hopkinson pressure bar system - Google Patents
Hopkinson pressure bar system Download PDFInfo
- Publication number
- CN109342222A CN109342222A CN201811320022.0A CN201811320022A CN109342222A CN 109342222 A CN109342222 A CN 109342222A CN 201811320022 A CN201811320022 A CN 201811320022A CN 109342222 A CN109342222 A CN 109342222A
- Authority
- CN
- China
- Prior art keywords
- test specimen
- compression bar
- support sleeve
- latch hook
- hopkinson pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012360 testing method Methods 0.000 claims abstract description 71
- 230000006835 compression Effects 0.000 claims abstract description 63
- 238000007906 compression Methods 0.000 claims abstract description 63
- 230000001681 protective effect Effects 0.000 claims abstract description 25
- 238000005452 bending Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- 230000035939 shock Effects 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims 1
- 230000003139 buffering effect Effects 0.000 claims 1
- 238000009863 impact test Methods 0.000 abstract description 5
- 238000011056 performance test Methods 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 208000033748 Device issues Diseases 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- 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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
Abstract
The invention belongs to material dynamic mechanical performance test technical fields, a kind of Hopkinson pressure bar system is disclosed, including the first compression bar and the second compression bar, test specimen is folded between the first compression bar and the second compression bar, first compression bar and the second compression bar are coated with support sleeve in the end of sandwiched test specimen, test specimen two ends are also wrapped up by two support sleeves respectively, and support sleeve is formed by a bending of elastic plate, are equipped with the latch hook of retractable support sleeve in the bending junction of support sleeve.Compression bar and test specimen are wrapped up by the way that openable and closable support sleeve is arranged, test specimen is remained during impact test with two compression bars and contacts, without sliding or falling problem, it is ensured that test specimen supporting & stablizing；Second compression bar loading device signal controls sounding device movement; make audio-switch and earth leakage protective device chain reaction; latch hook is above mentioned in time and being detached from support sleeve; support sleeve is opened therewith; test specimen is freely fallen; second compression bar can not touch test specimen rebound occurs, and will not generate secondary impact to test specimen.
Description
Technical field
The present invention relates to material dynamic mechanical performance test technical fields, and in particular, to one kind can be during the test
Stablize the Hopkinson pressure bar system of support test specimen.
Background technique
Material is in the dynamic mechanical under high speed impact (high strain-rate) and the quasi-static mechanical property under low strain dynamic rate
There is biggish difference, and Hopkinson (Hopkinson) compression bar experimental system is to carry out MATERIALS ' DYNAMIC Compressive Mechanical Properties to grind
Study carefully most common means.
The characteristics of according to Hopkinson pressure bar experimental system, during the experiment, test specimen, need to be clamped in two Hope's gold
Between gloomy bar, and the friction effect of bar Yu test specimen end face is not considered.For this purpose, usually being applied in test specimen two ends face when experiment one layer thin
And uniform lubricant, to minimize the influence of friction.For light material test specimen, so processing can keep test specimen to be in
Correct position, but material test specimen higher for density, due to frictional force very little, under gravity, test specimen can be slowly
Slide downward is even fallen, and leads to the failure of experiment.
In Hopkinson pressure bar system impact bar end should matched with its damper distance farther out, but in actual experiment
Middle impact bar is close at a distance from damper, can not unload impact force well, different degrees of rebound will occur and to test specimen
Secondary impact is caused, the failure mode after influencing test specimen stress leads to the failure of an experiment.
Summary of the invention
Present invention solves the technical problem that being to overcome the deficiencies of existing technologies, providing one kind can be during impact test
Prevent the Hopkinson pressure bar system for preventing test specimen from secondary impact occurs after test specimen landing, impact.
The purpose of the present invention is achieved through the following technical solutions:
A kind of Hopkinson pressure bar system, including the first compression bar and the second compression bar, test specimen are folded in the first compression bar and the second compression bar
Between, the first compression bar and the second compression bar are coated with support sleeve in the end of sandwiched test specimen, and test specimen two ends are also respectively by two institutes
Support sleeve package is stated, support sleeve is formed by a bending of elastic plate, is equipped with retractable support sleeve in the bending junction of support sleeve
Latch hook.
It is connected with loading device on first compression bar for providing load, further includes loading to fill with the first compression bar further
The sounding device of confidence number connection, is respectively arranged on the first compression bar and the second pressure at the audio-switch for receiving sounding device shoo
Earth leakage protective device by bar support sleeve connects to form closed circuit with audio-switch after two earth leakage protective devices are in parallel, and electric leakage is protected
The switch of shield device is located at right above latch hook and connects with latch hook, and the switch of earth leakage protective device is in normal state towards latch hook side
To, in the operating condition can above be mentioned with moveable lock hook make latch hook be detached from support sleeve.
Further, there are two through-holes for tool on support sleeve, and latch hook includes the pin of two pluggable through-holes.
Still further, support cover material is rubber.
Further, latch hook includes a non-close hook portion, and latch hook passes through the non-close hook portion hook to earth leakage protective device
Switch on.
Further, sounding device includes ballistic projections cylinder, bullet and the shock target for projectile impact sounding, hits target and leans on
Nearly audio-switch setting.
Further, the reaction time of earth leakage protective device is less than 0.001s.
Further, equipped with test specimen containing box for receiving below the position that test specimen is clamped by the first compression bar and the second compression bar
The test specimen fallen.
Further, cushion is disposed in test specimen containing box.
Compared with prior art, the invention has the following advantages:
1) present invention wraps up compression bar and test specimen by the way that openable and closable support sleeve is arranged, and makes test specimen can be with two during impact test
Root compression bar remains contact, without sliding occurs or falls problem, it is ensured that test specimen supporting & stablizing；
2) the first compression bar loading device signal control sounding device movement occurs audio-switch and earth leakage protective device chain anti-
It answers, latch hook is above mentioned being detached from support sleeve in time, support sleeve opens therewith, and test specimen and support sleeve are freely fallen, and hereafter second
Compression bar can not touch test specimen rebound occurs, and will not generate secondary impact to test specimen；
3) through-hole being arranged on latch hook on pin and support sleeve cooperates, and support sleeve folding can be made more flexible, pin is when above being mentioned
Through-hole can smoothly be deviate from, in addition, being contacting and separating for pin and through-hole acts regular, support sleeve will not be damaged, support sleeve can be anti-
It is multiple to use；
4) switch of latch hook and earth leakage protective device is detachably connectable, convenient for the installation of latch hook；
5) fallen directly into after test specimen is fallen in the containing box equipped with cushion, it can be ensured that test specimen does not generate fall on, i.e., further
Failure mode of the test specimen after by the impact force of the second compression bar is kept, success of the test rate is improved.
Detailed description of the invention
Fig. 1 is the overall structure diagram of Hopkinson pressure bar system described in embodiment 1；
Fig. 2 is the partial structural diagram of Hopkinson pressure bar system in Fig. 1；
Fig. 3 is switch three's annexation figure of support sleeve described in embodiment 1, latch hook and earth leakage protective device；
Fig. 4 is the reset condition figure after support sleeve constraint release.
Specific embodiment
The present invention is further illustrated With reference to embodiment, wherein attached drawing only for illustration,
What is indicated is only schematic diagram, rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
Embodiment 1
As shown in Figure 1, providing a kind of Hopkinson pressure bar system comprising the first compression bar 11 and the second compression bar 12, test specimen (does not show
It being folded between the first compression bar 11 and the second compression bar 12 out), the first compression bar is connected with loading device and generates impact to test specimen, the
One compression bar 11 and the second compression bar 12 are coated with support sleeve 2 in the end of sandwiched test specimen, and test specimen two ends are also respectively by two branch
Support set 2 wraps up, i.e., test specimen is wrapped up in support sleeve one end package compression bar, one end.
Specifically, convenient for the smooth clamping of test specimen and package, support sleeve 2 to be set as being formed by a bending of elastic plate,
The length of elastic sheet is to form seamless interfacing in bending junction when coating for support sleeve to each compression bar periphery, in support sleeve
2 bending junction is equipped with the latch hook 3 of retractable support sleeve.By specimen holder between the first compression bar 11 and the second compression bar 12
Afterwards, manually by two support sleeves 2 respectively along the first compression bar 11 and the bending of 12 periphery of the second compression bar until surrounding phase answers compression bar and examination
Part, then latch hook 3, which will be bent junction and be hooked, forms support sleeve 2, it is ensured that by stable holding, examination when test specimen progress impact test
Concentric position is in the first compression bar and the second compression bar when part is impacted.
The Hopkinson pressure bar system of the present embodiment is in addition to the stable holding for realizing specimen test process, it is also contemplated that second
The problem of impact rebound may strike test specimen, occurs for compression bar 12, to avoid test specimen from being interfered with its impact failure shape by secondary impact
Formula, the present embodiment are also provided with the sounding device 4 connecting with the first compression bar loading device signal, receive 4 sounding of sounding device
The audio-switch 5 of sound, the earth leakage protective device 6 for being respectively arranged on 2 side of the first compression bar and the second compression bar support sleeve, as shown in Fig. 2, acoustic control
Switch 5 is connect with power supply 7, connects to form closed circuit with audio-switch 5 and power supply 7 after two 6 parallel connections of earth leakage protective device, electric leakage
The switch 61 of protector 6 is located at right above latch hook 3 and connects with latch hook, the switch 61 of earth leakage protective device direction in normal state
3 direction of latch hook, can above be mentioned with moveable lock hook 3 in the operating condition make latch hook be detached from support sleeve 2.
When loading device works, make 12 impact test piece of the first compression bar, sounding device issues the sound immediately, audio-switch 5 and
When capture and voice signal and open, enter electric current and be connected in the circuit of earth leakage protective device 6, due to there is no electrical appliance in circuit,
Short circuit occurs for circuit, and " tripping " phenomenon occurs immediately for earth leakage protective device 6, and " tripping " switchs the dynamic of (i.e. the switch of earth leakage protective device)
Power pulls on latch hook 3 and above mentions, and hereafter, latch hook 3 and support sleeve 2 are detached from, and support sleeve 2 is because be elastic sheet, when losing latch hook 3
After constraint, support sleeve 2 will restore immediately open separation lamellar and from each compression bar, at this point, test specimen is also no longer by support sleeve 2
Constraint, freely falling body, the second compression bar 12 will will be unable to be contacted again test specimen when springing back under the effect of gravity.
When to mention latch hook 3 above, latch hook 3 can be easily successfully detached from support sleeve 2, the preferably bending in support sleeve 2
Two through-hole 21(, two through-holes are arranged respectively at the length direction both ends of elastic sheet in junction), as shown in figure 3, latch hook 3 is then
The pin of two pluggable through-holes is set, and more specifically, the through-hole of the support sleeve of brake forming is to incline in towards support sleeve axle center
Ramp-like, through-hole is arranged symmetrically, and the inclined direction of two pins is consistent with through-hole inclined direction, and the size of through-hole is adapted to pin,
Can also it is slightly smaller little by little, pin insertion through-hole after by itself and support cover material frictional force can ensure that autonomous pine does not occur completely
It is de-.
The support cover material of the present embodiment is hard rubber, can stable molding under external force, can in the case where not having external force
It is recovered to rapidly as shown in Figure 4 lamellar.
For the installation convenient for latch hook, latch hook further includes a non-close hook portion, and latch hook passes through the non-close hook portion hook to leakage
On the switch of non-electricity protector, in this way, latch hook can be removed from earth leakage protective device at any time.
Specifically, sounding device includes ballistic projections cylinder, bullet and the shock target for projectile impact sounding, and it is close to hit target
Audio-switch setting.Air pressure valve, the external high pressure gas input channel of air pressure valve, when high pressure gas is defeated are equipped in ballistic projections cylinder
It send to air pressure valve, air pressure valve is opened, and high pressure gas expansion pushes bullet to be advanced until in transmitting to shock target and issues sound.It is logical
Cross the mode that high pressure gas pushes bullet to advance has mark that can follow in many devices of the prior art, does not remember excessively herein
It carries.
Earth leakage protective device for the timeliness for ensuring test specimen and the disengaging of each compression bar, the present embodiment selects high sensitivity earth leakage protective
Device, reaction time are less than 0.001s, and after audio-switch work, earth leakage protective device can react rapidly, open support sleeve.
Test specimen is after free-falling, it would still be possible to generate collision with certain components of ground or this system and destroy, be
It avoids test specimen from generating this unnecessary secondary destruction, can be set below position that the first compression bar and the second compression bar clamp in test specimen
A test specimen containing box (not shown) is set for receiving the test specimen fallen, the size of test specimen containing box need to cover what test specimen may be fallen
The band of position, it is ensured that test specimen is very fallen into test specimen containing box, while there also is provided cushion in test specimen containing box, generally
Cushion is sponge or foam cotton, and test specimen, which drops to, will not generate any rigid collision on cushion, maintains test specimen by the first pressure
The collapse state of bar impact, it is ensured that the primary success of test.
Obviously, above-described embodiment is only intended to clearly illustrate technical solution of the present invention example, and is not
Restriction to embodiments of the present invention.For those of ordinary skill in the art, on the basis of the above description also
It can make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention should be included in right of the present invention and want
Within the protection scope asked.
Claims (9)
1. a kind of Hopkinson pressure bar system, including the first compression bar and the second compression bar, test specimen is folded in the first compression bar and the second pressure
Between bar, which is characterized in that the first compression bar and the second compression bar are coated with support sleeve, test specimen two ends in the end of sandwiched test specimen
It is wrapped up respectively by two support sleeves, support sleeve is formed by a bending of elastic plate, is equipped in the bending junction of support sleeve
The latch hook of retractable support sleeve.
2. Hopkinson pressure bar system according to claim 1, which is characterized in that further include and the first compression bar loading device
The sounding device of signal connection, is respectively arranged on the first compression bar and the second compression bar at the audio-switch for receiving sounding device shoo
Earth leakage protective device by support sleeve connects to form closed circuit with audio-switch after two earth leakage protective devices are in parallel, earth leakage protective
The switch of device is located at right above latch hook and connects with latch hook, the switch of earth leakage protective device in normal state towards latch hook direction,
Can above mention with moveable lock hook in the operating condition makes latch hook be detached from support sleeve.
3. Hopkinson pressure bar system according to claim 2, which is characterized in that there are two through-hole, locks for tool on support sleeve
Hook includes the pin of two pluggable through-holes.
4. Hopkinson pressure bar system according to any one of claims 1 to 3, which is characterized in that support cover material be
Rubber.
5. Hopkinson pressure bar system according to claim 2, which is characterized in that latch hook includes a non-close hook portion,
Latch hook passes through on the non-close hook portion hook to the switch of earth leakage protective device.
6. Hopkinson pressure bar system according to claim 2, which is characterized in that sounding device include ballistic projections cylinder,
Bullet and shock target for projectile impact sounding hit target and are arranged close to audio-switch.
7. Hopkinson pressure bar system according to claim 2, which is characterized in that the reaction time of earth leakage protective device is less than
0.001s。
8. Hopkinson pressure bar system according to claim 2, which is characterized in that test specimen is by the first compression bar and the second compression bar
Test specimen containing box is equipped with below the position of clamping for receiving the test specimen fallen.
9. Hopkinson pressure bar system according to claim 8, which is characterized in that be disposed with buffering in test specimen containing box
Object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320022.0A CN109342222B (en) | 2018-11-07 | 2018-11-07 | Hopkinson pressure bar system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320022.0A CN109342222B (en) | 2018-11-07 | 2018-11-07 | Hopkinson pressure bar system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109342222A true CN109342222A (en) | 2019-02-15 |
| CN109342222B CN109342222B (en) | 2024-03-26 |
Family
ID=65314154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811320022.0A Active CN109342222B (en) | 2018-11-07 | 2018-11-07 | Hopkinson pressure bar system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109342222B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114563295A (en) * | 2022-03-07 | 2022-05-31 | 湖南科技大学 | Friction wear test bench under simulation seabed high pressure contains muddy environment of silt |
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| Publication number | Publication date |
|---|---|
| CN109342222B (en) | 2024-03-26 |
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