CN209148460U - Penetration stress test system based on Hopkinson bar - Google Patents
Penetration stress test system based on Hopkinson bar Download PDFInfo
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- CN209148460U CN209148460U CN201821544524.7U CN201821544524U CN209148460U CN 209148460 U CN209148460 U CN 209148460U CN 201821544524 U CN201821544524 U CN 201821544524U CN 209148460 U CN209148460 U CN 209148460U
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- bar
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Abstract
The utility model discloses a kind of Penetration stress test systems based on Hopkinson bar, comprising: air pressure cavity and the gas source being connected to the air inlet of the air pressure cavity；Gun barrel, and one end of the gun barrel is connected to the gas outlet of the air pressure cavity, the other end of the gun barrel is open to form the outlet of bullet bar；For fixing the fixation device of test sample, the test sample and bullet bar outlet on the fixed device are opposite；The speed measuring device being set between the fixed device and the outlet of bullet bar；Piezoresistive transducer, for obtaining stress-time signal of the test sample.The structure design of the Penetration stress test system can measure stress-time signal degree of the film under different Penetration Speed based on the basic principle of Hopkinson bar.
Description
Technical field
The utility model relates to shock dynamics the field of test technology, are based on Hopkinson more specifically to one kind
The Penetration stress test system of bar.
Background technique
The design pursuit of structure anti-penetration properties is thin and light, this proposes very high want to the intrinsic mechanical property of material
It asks.Two-dimensional material graphene, excellent fracture toughness, intrinsic strength and transverse wave speed have agreed with the reason of structure penertration resistance design
It reads.Multi-layer graphene film is excellent than penetration energy-absorbing effect on the micro scale, has promoted numerous two-dimentional film materials carefully to see and has resisted
The research of impact property.However novel graphene film is still in the initial stage of design studies and popularization and application, anti-bullet
The research of performance is very few, and current experimental technique can not obtain stress-time data under more reliable dynamically load.It is existing
In technology, it is one that the essence of Hopkinson bar, which is that the characteristic for propagating elastic wave using it measures stress-time signal,
The tool that kind is widely analyzed for test material dynamic mechanical and stress wave propagation.
In conclusion how effectively to measure film based on the basic principle of Hopkinson bar in different Penetration Speed
Under stress-time signal, be current those skilled in the art's urgent problem.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of, the Penetration stress based on Hopkinson bar is surveyed
Test system, the structure design for being somebody's turn to do the Penetration stress test system based on Hopkinson bar can be based on Hopkinson bar
Basic principle measures stress-time signal degree of the film under different Penetration Speed.
In order to achieve the above object, the utility model provides the following technical solutions:
A kind of Penetration stress test system based on Hopkinson bar, comprising:
Air pressure cavity and the gas source being connected to the air inlet of the air pressure cavity；
Gun barrel, and one end of the gun barrel is connected to the gas outlet of the air pressure cavity, the other end of the gun barrel is open
Form the outlet of bullet bar；
For fixing the fixation device of test sample, the test sample on the fixed device exports phase with the bullet bar
It is right；
The speed measuring device being set between the fixed device and the outlet of bullet bar；
Piezoresistive transducer, for obtaining stress-time signal of the test sample.
Preferably, in the above-mentioned Penetration stress test system based on Hopkinson bar, length that the bullet bar is
For 1.5m-2.5m, the piezoresistive transducer is set on the bullet bar.
Preferably, in the above-mentioned Penetration stress test system based on Hopkinson bar, the gun barrel includes successively connecting
First connect is in charge of section and second is in charge of section, the described second end for being in charge of section be set in described first be in charge of on the end of section and
It is provided with sealing ring between the two.
Preferably, in the above-mentioned Penetration stress test system based on Hopkinson bar, described second is in charge of in section and sets
It is equipped with the stop collar passed through for bullet bar.
Preferably, in the above-mentioned Penetration stress test system based on Hopkinson bar, it is arranged in the fixed device
The side away from the gun barrel be provided with the first of reflective mirror and the variation for shooting the sample by the reflective mirror
Video camera.
Preferably, in the above-mentioned Penetration stress test system based on Hopkinson bar, the length of the bullet bar is
1mm-20mm further includes the transmission bar for being set to the side away from the gun barrel of the fixed device, the end of the transmission bar
Portion is provided with escape groove, and the cell wall of the escape groove offsets with the test sample on the fixed device, the escape groove and institute
It is opposite to state position among test sample.
Preferably, in the above-mentioned Penetration stress test system based on Hopkinson bar, the piezoresistive transducer is set
It is placed on the transmission bar.
It preferably, further include described for shooting in the above-mentioned Penetration stress test system based on Hopkinson bar
Bullet bar passes through the second video camera and third video camera of the motion profile before and after the test sample.
Preferably, in the above-mentioned Penetration stress test system based on Hopkinson bar, the speed measuring device is laser
Velometer.
Preferably, in the above-mentioned Penetration stress test system based on Hopkinson bar, the test sample is film
Or thin plate.
It is first when using the Penetration stress test system provided by the embodiment of the utility model based on Hopkinson bar
First bullet bar is placed in gun barrel, the test sample on fixed device is exported relatively with bullet bar.By gas source to atmospheric pressure cavity
Body gas supply, after so that the intracorporal atmospheric pressure value of atmospheric pressure cavity is risen to target air pressure value, air pressure cavity is deflated, and high pressure gas abrupt release is to drive
Bullet bar in dynamic gun barrel is mobile, and bullet bar is exported from the bullet bar of the gun barrel other end and projected, impact test sample, while pressure drag
Formula sensor measures stress-time signal of test sample.
From the foregoing, it will be observed that when using the Penetration stress test system provided by the utility model based on Hopkinson bar,
By adjusting target air pressure value, and the length of regulator elastic rod is, it can be achieved that speed can reach thin within the scope of 3m/s~400m/s
The measurement of film penetration mechanical signal, therefore the Penetration stress test system provided by the utility model based on Hopkinson bar
System can be realized the mechanical signal of testing film or thin plate under Different Dynamic Penetration Speed.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the Penetration stress test system based on Hopkinson bar that a kind of embodiment of the utility model provides
Structural schematic diagram；
Fig. 2 is the Penetration stress test system based on Hopkinson bar that the utility model another kind embodiment provides
The structural schematic diagram of system.
In Fig. 1-2:
1- air pressure cavity, 2- first are in charge of section, 3- bullet bar, 4- second and are in charge of section, 5- stop collar, 6- pressure resistance type sensing
Device, 7- laser velocimeter device, 8- test sample, 9- fixed device, 10- reflective mirror, the first video camera of 11-, 12- transmission bar, 12a-
Escape groove, the second video camera of 13-, 14- third video camera.
Specific embodiment
In view of this, the purpose of this utility model is to provide a kind of, the Penetration stress based on Hopkinson bar is surveyed
Test system, the structure design for being somebody's turn to do the Penetration stress test system based on Hopkinson bar can be based on Hopkinson bar
Basic principle measures stress-time signal degree of the film under different Penetration Speed.
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
In the description of the present invention, it should be understood that term " on ", "lower", "front", "rear", " left side " and " right side "
The orientation or positional relationship of equal instructions is to be based on the orientation or positional relationship shown in the drawings, and being merely for convenience of description, this is practical new
Type and simplified description, rather than the position of indication or suggestion meaning or element must have particular orientation, with specific orientation structure
At and operation, therefore should not be understood as the limitation of the utility model.In addition, term " first ", " second " are used for description purposes only,
It is not understood to indicate or imply relative importance.
Please refer to Fig. 1-Fig. 2, the Penetration stress test provided by the embodiment of the utility model based on Hopkinson bar
System includes air pressure cavity 1, gas source, gun barrel, fixed device 9, speed measuring device and piezoresistive transducer 6.Wherein, gas source and air pressure
The air inlet of cavity 1 is connected to, i.e., gas source can be to supplying, so as to form high pressure shape inside air pressure cavity 1 inside air pressure cavity 1
State.One end of gun barrel is connected to the gas outlet of air pressure cavity 1, and the other end of gun barrel is open to form the outlet of bullet bar 3.Above-mentioned bullet
Bar 3 is rod-shaped bullet, and after bullet bar 3 is placed in gun barrel, the length of bullet bar 3 is placed along the length direction of gun barrel.
Fixed device 9 is fixed the fixed test sample 8 of device 9 and bullet bar 3 exports relatively for fixing test sample 8.I.e. from rifle
The bullet bar 3 that the outlet of bullet bar 3 of pipe is projected can be hit with test sample 8.When the bullet projected from the outlet of the bullet bar 3 of gun barrel
When 3 speed of bar is very high, bullet bar 3 can hit and pass through test sample 8.
It is first when using the Penetration stress test system provided by the embodiment of the utility model based on Hopkinson bar
First bullet bar 3 is placed in gun barrel, the test sample 8 on fixed device 9 is exported relatively with bullet bar 3.By gas source to gas
Cavity 1 is pressed to supply, after so that the atmospheric pressure value in air pressure cavity 1 is risen to target air pressure value, air pressure cavity 1 is deflated, high pressure gas moment
Release is mobile to drive the bullet bar 3 in gun barrel, and bullet bar 3 is exported from the bullet bar 3 of the gun barrel other end and projected, impact test examination
Sample 8, while piezoresistive transducer 6 measures stress-time signal of test sample 8.
From the foregoing, it will be observed that when using the Penetration stress test system provided by the utility model based on Hopkinson bar,
By adjusting target air pressure value, and the length of regulator elastic rod 3 is, it can be achieved that speed can reach thin within the scope of 3m/s~400m/s
The measurement of film penetration mechanical signal, therefore the Penetration stress test system provided by the utility model based on Hopkinson bar
System can be realized the mechanical signal of testing film or thin plate under Different Dynamic Penetration Speed.
Digital speckle technology can be used for the ease of observation sample 6, i.e., has sprayed equally distributed dissipate on 6 surface of sample
Spot.
Preferably, as shown in FIG. 1, FIG. 1 is the stress measurement in low speed Penetration, low speed Penetration neutron elastic rods 3
For length be 1.5m-2.5m, piezoresistive transducer 6 is set on bullet bar 3.Specifically, piezoresistive transducer 6 can be pasted
On bullet bar 3.The end of close gun barrel bullet bar 3 outlet of bullet bar 3 is arranged in piezoresistive transducer 6.So set
It sets, group elastic rod 3 is exported from the bullet bar 3 of gun barrel and projected, impact test sample 8, and then the contact force of sample 8 passes to bullet
Bar 3 can be obtained stress-time signal in shock 8 whole process of sample of bullet bar 3.
Further, for the ease of processing gun barrel, gun barrel may include sequentially connected first being in charge of section 2 and second and being in charge of
Section 4, the second end for being in charge of section 4 is set on the end that first is in charge of section 2 and is provided with sealing ring between the two, to prevent leak-stopping
Gas.Second, which is in charge of the end of section 4 and first, is in charge of between the end of section 2 and can be threadedly coupled, and is not limited thereto.
Since second is in charge of 4 sets of section and is in charge of in section 2 first, cause second be in charge of section 4 internal diameter it is larger, it is sub in order to prevent
Elastic rod 3 deviates, and second is in charge of the stop collar 5 for being provided in section 4 and passing through for bullet bar 3.So set, bullet bar 3 is made to pass through limit
Position ring 5 can prevent from shifting in 3 moving process of bullet bar.The axial direction that stop collar 5 can be in charge of section 4 along second is slided
It is dynamic.
In order to observe the variation of sample, the above-mentioned Penetration stress test system based on Hopkinson bar at any time
It further include that the reflective mirror 10 of the side away from gun barrel of fixed device 9 is set and for shooting sample variation by reflective mirror 10
The first video camera 11.The test sample 8 that i.e. reflective mirror 10 can be set on fixed device 9 deviates from the side of gun barrel, i.e., instead
The back side of the sample on fixed device 9 can be set in light microscopic 10, and the first video camera 11 directly shoots reflective mirror 10, and utilization is reflective
Mirror 10 reflects, the process penetrated by the stress wave propagation and failure at the first video camera 11 record sample back side, using same
Principle, can recorde the destructive process of specimen surface.
Fixed device 9 can be annulus fixing piece, by the edge of clamping test sample 8 to realize to test sample 8
It is fixed.
In Fig. 1, the low speed Penetration stress test system course of work based on Hopkinson bar are as follows:
A, shock dynamics test macro is aligned using Precision trimming platform, makes the center of gun barrel and annulus stationary fixture
On the same line；
B, test sample 8 is placed between clamping rings fixture；
C, by 3 stopper rod of bullet bar into gun barrel；
D, the first video camera 11 is adjusted to suitable position；
E, it is supplied to air pressure cavity 1, automatic deflation when reaching the target value of setting；
F, high pressure gas abrupt release, promotor site elastic rod 3 accelerate；
G, the bullet bar 3 after going out thorax hits sample；
H, the stress wave generated when measuring and contact by piezoresistive transducer 6；
I, it is hitting simultaneously, the deformation and failure procedure with the first video camera 11 record sample；
J, data are saved, power supply is closed, take out sample.
As shown in Fig. 2, Fig. 2 is the stress measurement in high speed Penetration, the length of high speed Penetration neutron elastic rod 3 is
1mm-20mm, the above-mentioned Penetration stress test system based on Hopkinson bar further includes being set to deviating from for fixed device 9
The transmission bar 12 of the side of gun barrel, the end of transmission bar 12 are provided with escape groove 12a, the cell wall of escape groove 12a and fixed device 9
On test sample 8 offset, escape groove 12a and the intermediate position of test sample 8 are opposite.Such escape groove 12a gives test examination
The space of the deformation of sample 8.Test sample 8 is mounted between the cell wall of escape groove 12a and fixed device 9, is tried with realizing test
The fixation of sample 8.
Further, piezoresistive transducer 6 is set on transmission bar 12.Specifically, piezoresistive transducer 6 is pasted onto transmission
Bar 12 is close to the end of test sample 8.So pass through, group elastic rod 3 is exported from the bullet bar 3 of gun barrel and projected, and is hit and is passed through
Test sample 8, and then the transmitted wave of test sample 8 passes to bullet bar 3, can be obtained bullet bar 3 and hits and pass through entire mistake
Stress-time signal in journey, analysis obtains transmitted wave, and then obtains stress-time signal of test sample 8.
The motion profile before and after sample is passed through for the ease of observation bullet bar 3, can also include wearing for shooting bullet bar 3
Cross the second video camera 13 and third video camera 14 of the motion profile of 8 front and back of test sample.Wherein, the second video camera 13 is for clapping
Motion profile of the bullet bar 3 before test sample 8 is taken the photograph, third video camera 14 is for shooting bullet bar 3 after test sample 8
Motion profile.
In above-described embodiment.Fixed device 9 can be thread ring, and thread ring is connect with the end thread of transmission bar 12
?.
In addition, speed measuring device can be laser velocimeter device 7, the incidence that bullet bar 3 is measured by laser velocimeter device 7 is initial
Speed.Certainly it can also be the tachymeter of other structures, be not limited thereto.
Preferably, test sample 8 can be film or thin plate.
In the course of work, piezoresistive transducer 6 can be electrically connected with dynamic strain indicator and oscillograph, piezoresistive transducer 6
It can be common foil gauge or semiconductor gauge.
In addition, the outer diameter of bullet bar 3 is not in order to realize the Penetration stress test experiment based on Hopkinson bar
It is preferably excessive, otherwise it is difficult to ensure the elongated attribute of rod piece.
In Fig. 2, the high speed Penetration stress test system course of work based on Hopkinson bar are as follows:
A, shock dynamics test macro is aligned using Precision trimming platform, make gun barrel, bullet bar 3, thread ring and
The center of transmission bar 12 is on the same line；
B, test sample 8 is placed between thread ring and transmission bar 12；
C, bullet bar 3 is filled in into gun barrel；
D, the second video camera 13 and third video camera 14 are adjusted to suitable position；
E, it is supplied to air pressure cavity 1, automatic deflation when reaching the target value of setting；
F, high pressure gas abrupt release, promotor site elastic rod 3 accelerate；
G, go out the 3 penetration sample of bullet bar after thorax；
H, the stress wave that contact generates is measured by piezoresistive transducer 6；
I, it is hitting simultaneously, the movement and failure of the second video camera 13 and the record bullet bar 3 of third video camera 14 or sample
Process；
J, data are saved, power supply is closed, take out sample.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (10)
1. a kind of Penetration stress test system based on Hopkinson bar characterized by comprising
Air pressure cavity (1) and the gas source being connected to the air inlet of the air pressure cavity (1)；
Gun barrel, and one end of the gun barrel is connected to the gas outlet of the air pressure cavity (1), the open shape of the other end of the gun barrel
It is exported at bullet bar (3)；
Test sample (8) and the bullet for fixing the fixation device (9) of test sample (8), on the fixed device (9)
Bar (3) outlet is opposite；
The speed measuring device being set between the fixed device (9) and bullet bar (3) outlet；
Piezoresistive transducer (6), for obtaining stress-time signal of the test sample (8).
2. the Penetration stress test system according to claim 1 based on Hopkinson bar, which is characterized in that institute
Stating the length that bullet bar (3) is is 1.5m-2.5m, and the piezoresistive transducer (6) is set on the bullet bar (3).
3. the Penetration stress test system according to claim 2 based on Hopkinson bar, which is characterized in that institute
Stating gun barrel includes sequentially connected first being in charge of section (2) and second and being in charge of section (4), and the described second end for being in charge of section (4) is arranged
It is provided with sealing ring on the end that described first is in charge of section (2) and between the two.
4. the Penetration stress test system according to claim 3 based on Hopkinson bar, which is characterized in that institute
It states second and is in charge of in section (4) and be provided with the stop collar (5) passed through for bullet bar (3).
5. the Penetration stress test system according to claim 2 based on Hopkinson bar, which is characterized in that set
It sets and the side away from the gun barrel of the fixed device (9) is provided with reflective mirror (10) and for by the reflective mirror
(10) the first video camera (11) of the variation of the sample is shot.
6. the Penetration stress test system according to claim 1 based on Hopkinson bar, which is characterized in that institute
The length for stating bullet bar (3) is 1mm-20mm, further includes the side away from the gun barrel for being set to the fixed device (9)
The end of transmission bar (12), the transmission bar (12) is provided with escape groove (12a), the cell wall of the escape groove (12a) with it is described
Test sample (8) on fixed device (9) offsets, and the escape groove (12a) is opposite with the intermediate position of the test sample (8).
7. the Penetration stress test system according to claim 6 based on Hopkinson bar, which is characterized in that institute
Piezoresistive transducer (6) is stated to be set on the transmission bar (12).
8. the Penetration stress test system according to claim 5 based on Hopkinson bar, which is characterized in that also
Including for shooting motion profile of the bullet bar (3) before and after the test sample (8) the second video camera (13) and
Third video camera (14).
9. the Penetration stress test system according to claim 1 based on Hopkinson bar, which is characterized in that institute
Stating speed measuring device is laser velocimeter device (7).
10. the Penetration stress test system according to claim 1 based on Hopkinson bar, which is characterized in that institute
Stating test sample (8) is film or thin plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821544524.7U CN209148460U (en) | 2018-09-20 | 2018-09-20 | Penetration stress test system based on Hopkinson bar |
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| CN201821544524.7U CN209148460U (en) | 2018-09-20 | 2018-09-20 | Penetration stress test system based on Hopkinson bar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179223A (en) * | 2020-08-21 | 2021-01-05 | 沈阳理工大学 | Shell penetration multilayer hard target layer counting sensing simulation experiment device |
| CN112378814A (en) * | 2020-10-28 | 2021-02-19 | 西南石油大学 | Annular flow gas core liquid drop observation device in hydrophobic circular tube |
| CN113720688A (en) * | 2021-08-17 | 2021-11-30 | 重庆大学 | Method for determining elastic energy of circular film in contact with rigid plate under gas pressure |
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2018
- 2018-09-20 CN CN201821544524.7U patent/CN209148460U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179223A (en) * | 2020-08-21 | 2021-01-05 | 沈阳理工大学 | Shell penetration multilayer hard target layer counting sensing simulation experiment device |
| CN112179223B (en) * | 2020-08-21 | 2022-12-30 | 沈阳理工大学 | Multilayer hard target layer-counting sensing simulation experiment device for penetration of projectile body |
| CN112378814A (en) * | 2020-10-28 | 2021-02-19 | 西南石油大学 | Annular flow gas core liquid drop observation device in hydrophobic circular tube |
| CN113720688A (en) * | 2021-08-17 | 2021-11-30 | 重庆大学 | Method for determining elastic energy of circular film in contact with rigid plate under gas pressure |
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