CN110926968A - Improved SHPB test device - Google Patents
Improved SHPB test device Download PDFInfo
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- CN110926968A CN110926968A CN201911149133.4A CN201911149133A CN110926968A CN 110926968 A CN110926968 A CN 110926968A CN 201911149133 A CN201911149133 A CN 201911149133A CN 110926968 A CN110926968 A CN 110926968A
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- bullet
- guide rail
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- strain gauge
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- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 10
- 230000003746 surface roughness Effects 0.000 claims description 5
- 230000003116 impacting effect Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 238000002474 experimental method Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 description 3
- 230000003993 interaction Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
-
- 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
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
-
- 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 invention belongs to the technical field of material mechanics and impact experiment mechanics, and relates to an improved SHPB test device. The device comprises a launching device 1, a bullet 2, a smooth guide rail 4, an incident rod 5, a transmission rod 8 and a measuring system; the shooting device 1 is used for shooting a bullet 2, and the bullet 2 slides on a smooth guide rail 4; a boss lower than a bullet sliding surface is arranged on the smooth guide rail 4 close to the bullet side at a gap position 4 between the smooth guide rail and the launching device 1, a gap exists between the upper surface of the boss and the launching device 1, and the gap is used as an exhaust port 3 for the launching device 1 to launch a bullet 5; the other side of the smooth guide rail 4 is in contact with an incident rod 5, and a test piece is clamped between the incident rod 5 and a transmission rod 8; the measurement system is used to capture the impact effects of the incident rod 5 and the transmission rod 8.
Description
Technical Field
The invention belongs to the technical field of material mechanics and impact experiment mechanics, and relates to an improved Split Hopkinson Pressure (SHPB) test device.
Background
The mechanical property of the material refers to the behavior of resisting deformation and damage under the combined action of factors such as external force, temperature, environment and the like. Under the action of impact load, the material is in a higher strain rate state, and the mechanical properties of most materials are obviously different from those under a quasi-static condition. In practical engineering applications, the mechanical properties of corresponding materials under high strain rate need to be known.
At present, high strain rate tests aiming at materials at home and abroad mainly pass through SHPB, SHTB and torsional SHB devices. Wherein the SHPB apparatus was used for compression experiments; SHTB apparatus for tensile testing; the torsional SHB apparatus was used for torsional shear testing. For an SHPB device, a test device used at present at home and abroad mainly accelerates bullets by high-pressure gas and then generates stress pulses by impacting an incident rod at the tail end of a bore. Based on the observation of the impact process by a high-speed camera system, the device is found to have a large influence on the test result because the high-pressure gas in the gun bore cannot be released quickly and the high-pressure gas interacts with the bullet, so that the bullet hardly moves in the opposite direction after the first impact but impacts the incident rod again to form a multiple impact process.
Therefore, there is a need for an improved SHPB testing apparatus that meets the testing requirement of a bullet hitting an incident rod only once.
Disclosure of Invention
The purpose of the invention is: the improved SHPB testing device meets the requirement of quick release of high-pressure gas in a gun bore, realizes the test requirement that a bullet and an incident rod are impacted once, and improves the reliability and reliability of test results.
The technical scheme of the invention is as follows:
the invention provides an improved SHPB test device, which comprises a launching device 1, a bullet 2, a smooth guide rail 4, an incident rod 5, a transmission rod 8 and a measuring system, wherein the launching device is connected with the bullet 2;
the shooting device 1 is used for shooting a bullet 2, and the bullet 2 slides on a smooth guide rail 4; a boss lower than a bullet sliding surface is arranged on the smooth guide rail 4 close to the bullet side at a gap position 4 between the smooth guide rail and the launching device 1, a gap exists between the upper surface of the boss and the launching device 1, and the gap is used as an exhaust port 3 for the launching device 1 to launch a bullet 5; the other side of the smooth guide rail 4 is in contact with an incident rod 5, and a test piece is clamped between the incident rod 5 and a transmission rod 8;
the measurement system is used to capture the impact effects of the incident rod 5 and the transmission rod 8.
Further, the measurement system includes: the system comprises a first strain gauge 6, a second strain gauge 9, a high-speed camera 11 and a super-dynamic strain gauge 12;
the first strain gauge 6 is arranged on the incident rod 5; the second strain gauge 9 is mounted on the transmission rod 8; the high-speed camera 11 records the whole process of bullet shooting and impacting the test piece; the strain information recorded by the ultra-dynamic strain gauge 12 and the first strain gauge 6 and the second strain gauge 9 respectively.
Further, the smooth guide rail 4 is a groove machined by a steel structure.
Further, the length of the smooth guide rail 4 is not less than 1.5 times the length of the bullet.
Further, one side of the smooth guide rail 4 is provided with an exhaust port 3, and the other side of the smooth guide rail is just contacted with the incident rod 5.
Furthermore, the bullet 2, the guide rail circle center of the smooth guide rail 4, the incident rod 5, the test piece 7 to be tested and the transmission rod 8 are positioned on the same horizontal plane.
Further, the surface roughness of the smooth rail 4 is consistent with the surface roughness of the bullet 2.
Further, the smooth guide rail 4 is in contact with the incident rod 5, the contact length is not less than the diameter of the incident rod 5, and the sum of the contact length and the length of the bullet 2 is not more than the length of the smooth guide rail 4.
The invention has the advantages that: the invention provides an improved SHPB test device, which is provided with a smooth guide rail and an exhaust port, high-pressure gas in a gun bore is quickly released, the impact of a bullet and an incident rod is realized outside the gun bore, the repeated continuous quick impact of the bullet and the incident rod is avoided, the reliability and the reliability of a test result are improved, and the improved SHPB test device has a wide application prospect.
Drawings
FIG. 1 is a schematic front view of an improved SHPB testing apparatus;
FIG. 2 is a schematic top view of the smooth rail and vent;
fig. 3 is a left side schematic view of the smooth rail and vent.
Wherein, 1-a transmitting device; 2-a bullet; 3-an exhaust port; 4-smooth guide rail; 5-an incident rod; 6-a first strain gauge; 7-a test piece to be tested; 8-a transmission rod; 9-a second strain gage; 10-a damping block; 11-a high-speed camera; 12-ultra dynamic strain gauge.
Detailed Description
The following further describes the detailed structure, operation and embodiments of the present invention with reference to the drawings, but the scope of the present invention should not be limited thereby. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
The invention designs the high-pressure gas exhaust port based on the smooth guide rail system, and introduces a new idea for the development of the SHPB test device.
The invention provides an improved SHPB test device, which comprises a launching device 1, a bullet 2, a smooth guide rail 4, an incident rod 5, a transmission rod 8 and a measuring system, wherein the launching device is connected with the bullet 2;
the smooth guide rail 4 is provided with an exhaust port 3 (shown in fig. 2 and 3) at the side close to the bullet, and the side close to the incident rod 5 is contacted with the exhaust port; the contact length is not less than the diameter of the incident rod 5, and the sum of the contact length and the length of the bullet 2 is not more than the length of the smooth guide rail 4; the smooth guide rail 4 is a groove processed by a steel structure, the surface roughness of the smooth guide rail is consistent with that of the bullet 2, and the length of the smooth guide rail is not less than 1.5 times of that of the bullet 2;
the measuring system comprises a first strain gauge 6, a second strain gauge 9, a high-speed camera 11 and a super-dynamic strain gauge 12;
the bullet 2, the guide rail circle center of the smooth guide rail 4, the incident rod 5, the test piece 7 to be tested and the transmission rod 8 are positioned on the same horizontal plane by adjusting the height of the supporting point;
in the test process, the method comprises the following steps:
1. the high-pressure gas of the launching device 1 impacts the bullet 2 to start accelerating;
2. the bullet 2 smoothly enters the smooth guide rail 4 at the tail end of the bore, when the bullet 2 completely enters the smooth guide rail 4, high-pressure gas in the bore is released through the exhaust port 3, and the interaction between the bullet 2 and the high-pressure gas is released;
3. at the tail end of the smooth guide rail 4, the bullet 2 and the incident rod 5 axially collide, and quasi-one-dimensional stress pulse is generated inside the incident rod 5;
4. meanwhile, the bullet 2 moves in the opposite direction, and the bullet cannot collide with the incident rod 5 again without high-pressure gas;
5. strain values of the stress pulse in the incident rod 5 and the transmission rod 8 are obtained through the first strain gauge 6, the second strain gauge 9 and the ultra-dynamic strain gauge 12;
6. the deformation and destruction process of the test piece 7 to be tested is captured by the high-speed camera 11.
The invention is mainly applied to SHPB tests of various materials, effectively avoids the bullet from impacting an incident rod for many times due to the interaction between the gas in the bore of the launching device and the bullet, improves the reliability of the experimental process, can capture the deformation and damage processes of a test piece to be tested in the experimental process, and has wide application prospect.
Claims (8)
1. An improved split Hopkinson pressure bar SHPB testing device is characterized by comprising a launching device (1), a bullet (2), a smooth guide rail (4), an incident bar (5), a transmission bar (8) and a measuring system;
the shooting device (1) is used for shooting the bullet (2), and the bullet (2) slides on the smooth guide rail (4); a boss lower than a bullet sliding surface is arranged on the bullet-near side of the smooth guide rail (4) at a gap position (4) between the smooth guide rail and the launching device (1), a gap exists between the upper surface of the boss and the launching device (1), and the gap is used as an exhaust port (3) of the launching device (1) for launching the bullet (5); the other side of the smooth guide rail (4) is in contact with an incident rod (5), and a test piece is clamped between the incident rod (5) and the transmission rod (8);
the measuring system is used for capturing the impact effect of the incident rod (5) and the transmission rod (8).
2. The apparatus of claim 1, wherein the measurement system comprises: the device comprises a first strain gauge (6), a second strain gauge (9), a high-speed camera (11) and a hyper-dynamic strain gauge (12);
the first strain gauge (6) is arranged on the incident rod (5); the second strain gauge (9) is arranged on the transmission rod (8); the high-speed camera (11) records the whole process of bullet shooting and impacting the test piece; the strain information recorded by the ultra-dynamic strain gauge (12) and the first strain gauge (6) and the second strain gauge (9) respectively.
3. Device according to claim 1, characterized in that the smooth rail (4) is a groove machined in a steel construction.
4. Device according to claim 1, characterized in that the length of the smooth rail (4) is not less than 1.5 times the bullet length.
5. Device according to claim 1, characterized in that the smooth guide (4) is provided with an exhaust opening (3) on one side and just in contact with the entrance bar (5) on the other side.
6. The device according to claim 1, characterized in that the axes of the bullet (2), the guide track circle center of the smooth guide track (4), the incident rod (5), the test piece (7) to be tested and the transmission rod (8) are located on the same horizontal plane.
7. Device according to claim 2, characterized in that the smooth rail (4) surface roughness is kept in conformity with the bullet (2) surface roughness.
8. The device according to claim 4, characterized in that the smooth rail (4) is in contact with the entrance rod (5) with a contact length not less than the diameter of the entrance rod (5) and the sum of the contact length and the bullet (2) length is not greater than the smooth rail (4) length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911149133.4A CN110926968A (en) | 2019-11-21 | 2019-11-21 | Improved SHPB test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911149133.4A CN110926968A (en) | 2019-11-21 | 2019-11-21 | Improved SHPB test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110926968A true CN110926968A (en) | 2020-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911149133.4A Pending CN110926968A (en) | 2019-11-21 | 2019-11-21 | Improved SHPB test device |
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| Country | Link |
|---|---|
| CN (1) | CN110926968A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4712465A (en) * | 1986-08-28 | 1987-12-15 | The Boeing Company | Dual purpose gun barrel for spin stabilized or fin stabilized projectiles and gun launched rockets |
| CN103760010A (en) * | 2014-01-22 | 2014-04-30 | 南京理工大学 | Hopkinson test emission gun barrel with pressure release device |
| CN106441772A (en) * | 2016-09-29 | 2017-02-22 | 四川海恩瑞捷测控技术有限公司 | Flight recorder impact test sabot separation device and separation method thereof |
| CN206523379U (en) * | 2017-01-19 | 2017-09-26 | 北京东方德兴科技有限公司 | Hopkinson pressure bar is launched and bullet recovery system |
| CN108169039A (en) * | 2017-11-29 | 2018-06-15 | 中国飞机强度研究所 | A kind of portable small energy impact experimental rig and its application method |
| CN108896385A (en) * | 2018-09-17 | 2018-11-27 | 济南大学 | A kind of SHPB device and method for realizing the controllable strain rate impact of superelevation |
-
2019
- 2019-11-21 CN CN201911149133.4A patent/CN110926968A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4712465A (en) * | 1986-08-28 | 1987-12-15 | The Boeing Company | Dual purpose gun barrel for spin stabilized or fin stabilized projectiles and gun launched rockets |
| CN103760010A (en) * | 2014-01-22 | 2014-04-30 | 南京理工大学 | Hopkinson test emission gun barrel with pressure release device |
| CN106441772A (en) * | 2016-09-29 | 2017-02-22 | 四川海恩瑞捷测控技术有限公司 | Flight recorder impact test sabot separation device and separation method thereof |
| CN206523379U (en) * | 2017-01-19 | 2017-09-26 | 北京东方德兴科技有限公司 | Hopkinson pressure bar is launched and bullet recovery system |
| CN108169039A (en) * | 2017-11-29 | 2018-06-15 | 中国飞机强度研究所 | A kind of portable small energy impact experimental rig and its application method |
| CN108896385A (en) * | 2018-09-17 | 2018-11-27 | 济南大学 | A kind of SHPB device and method for realizing the controllable strain rate impact of superelevation |
Non-Patent Citations (1)
| Title |
|---|
| 陈雄 等: "《固体推进剂黏弹性力学》", 31 August 2016 * |
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Application publication date: 20200327 |