CN109323919B - Separated Hopkinson pressure bar positioning device suitable for multi-size test piece - Google Patents
Separated Hopkinson pressure bar positioning device suitable for multi-size test piece Download PDFInfo
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- CN109323919B CN109323919B CN201811388020.5A CN201811388020A CN109323919B CN 109323919 B CN109323919 B CN 109323919B CN 201811388020 A CN201811388020 A CN 201811388020A CN 109323919 B CN109323919 B CN 109323919B
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- sleeve wall
- test piece
- lower sleeve
- upper sleeve
- piece
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- 238000012360 testing method Methods 0.000 title claims abstract description 68
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 15
- 239000000463 material Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 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
- 230000007547 defect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000009434 installation 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
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229940099259 vaseline Drugs 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
- G01N3/02—Details
- G01N3/04—Chucks
-
- 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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
-
- 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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
Abstract
The invention discloses a split Hopkinson pressure bar positioning device suitable for a multi-size test piece. The detachable clamping device consists of an upper sleeve and a lower sleeve, one sides of the upper sleeve and the lower sleeve are connected into a whole through a loose-leaf hinge, the detachable clamping device is arranged at the tail end of an incident rod, which is in contact with a test piece, when the detachable clamping device is used, and the upper sleeve and the lower sleeve are fixed by bolts on the other sides. The side locating piece is placed on the lower sleeve, the curved surface of the side locating piece is used for locating the position of the test piece, and the center of the test piece, the center of the incident rod and the center of the transmission rod are ensured to be on the same straight line. The invention has simple structure, can realize the accurate positioning of the test piece, and has corresponding side positioning pieces matched with the test pieces with different sizes, thereby having strong applicability. Meanwhile, the structure is convenient to install and detach, and the operation is simple and convenient.
Description
Technical Field
The invention relates to the field of dynamic mechanical property test and research of materials, in particular to a split Hopkinson pressure bar positioning device suitable for a multi-size test piece.
Background
When solving the practical problems of many engineering technologies and military technologies, people often encounter various dynamic load problems such as impact, explosion and the like, and the mechanical response of most materials under dynamic load is greatly different from that of static load. In order to further study the mechanical response of materials under dynamic loading, a series of dynamic loading instrument designs and improvements have been made since the 19 th century.
The first impact tensile test was completed in j.hopkinson 1872 using iron wire and drop hammer, and in 1914, b.hopkinson used Hopkinson struts to determine the pressure-time relationship at the end of an explosive explosion or bullet firing rod. In 1949, kolsky first turned the Hopkinson struts into split and used to study the dynamic mechanical behavior of materials at high strain rates. The Split Hopkinson Pressure Bar (SHPB) is then widely used in test experiments for dynamic properties of materials.
The Hopkinson pressure bar experiment system widely used at present consists of a bullet shooting device, a waveform shaper, an incidence rod, a transmission rod, a buffer (generally, a buffer transmission rod, a damping device and the like), a waveform amplifier, a digital oscilloscope and the like, when a material impact compression experiment is carried out, a test piece is clamped between the incidence rod and the transmission rod, then the shooting device shoots a hit bullet under a certain hit air pressure, a corresponding incidence wave is generated by the impact of the shooting device and the end face of the incidence rod, a reflection wave is generated due to the difference of impedance when the incidence wave moves to the end faces of the incidence rod and the test piece, and a transmission wave is generated on the end faces of the test piece and the transmission rod. The incident wave, the reflected wave and the transmitted wave are transmitted into the digital oscilloscope through the strain gauge and the lead which are stuck on the incident rod and the transmission rod.
When the Hopkinson pressure bar is adopted to test the impact compression performance of the test piece, the one-dimensional stress wave assumption and the assumption of stress balance of two end faces of the test piece are required to be met, otherwise, the test result cannot accurately reflect the dynamic mechanical property of the test piece.
The split type Hopkinson bar experimental technology is currently recognized as the most main and reliable experimental method for researching the mechanical properties of materials under the medium and high strain rate, the Hopkinson bar can be utilized to simulate the strain rate conditions similar to the field, and the application field of the split type Hopkinson bar experimental technology is expanded from the original metal material to a series of new materials such as rock, concrete, ceramic, high polymer, composite material and the like.
However, the existing split type hopkinson pressure bar system has the following defects in the actual operation process:
1. the existing split Hopkinson bar is not provided with a corresponding supporting device after a test piece is placed between an incident bar and a transmission bar, and because lubricant such as vaseline is generally smeared at the end part of the test piece to reduce the influence of end friction on a measurement result, the test piece is likely to slide off from between the incident bar and the transmission bar before the test starts, so that the test piece is damaged.
2. When the diameter of a test piece to be tested is different from that of a Hopkinson pressure bar, the coaxial placement of the center of the test piece and the center of the Hopkinson pressure bar cannot be accurately realized, the pressure bar is easy to bend when an impact test is carried out, the assumption of one-dimensional stress wave propagation is affected, errors are brought to the measurement of test waveforms, and the accuracy of the test is reduced.
Disclosure of Invention
The invention aims to provide a split Hopkinson pressure bar positioning device which has simple structure, convenient operation and wide application range and is suitable for multi-size test pieces, so as to solve the problems that the existing split Hopkinson pressure bar testing device can not provide reliable support for the test pieces clamped between an incident bar and a transmission bar and can not realize coaxial and accurate positioning and placement of the center of the test piece and the center of the pressure bar,
in order to achieve the above purpose, the present invention adopts the following technical scheme:
the split Hopkinson pressure bar positioning device suitable for the multi-size test piece is characterized by comprising a detachable clamping device and a side positioning piece matched with the diameter difference of the test piece and the diameter difference of an incident bar; the detachable clamping device consists of an upper sleeve wall and a lower sleeve wall, one side of the upper sleeve wall and one side of the lower sleeve wall are connected into a whole through a hinge, and the other side of the upper sleeve wall and the other side of the lower sleeve wall can be opened and closed as required and are provided with a connecting structure; the inner diameters of the upper sleeve wall and the lower sleeve wall are equal to the diameter of the incident rod, and the lower sleeve wall is provided with a supporting structure for supporting the side locating piece; the side locating piece is provided with a surface matched with the supporting structure and a test piece locating arc surface contacted with the test piece.
Preferably, the upper sleeve wall and the lower sleeve wall of the detachable clamping device are semi-cylindrical, and the lower sleeve wall protrudes out of the upper sleeve wall to serve as the supporting structure at one end where the test piece is located.
Preferably, the thickness of the upper sleeve wall and the lower sleeve wall is 1mm, the length of the upper sleeve wall is 5cm, and the length of the lower sleeve wall is 7.5cm.
Preferably, the connection structure includes: the free edges of the upper sleeve and the lower sleeve are respectively provided with a flange, when the upper sleeve and the lower sleeve are closed, the flanges are mutually parallel, and two threaded holes with the same size are formed in the same position of the upper flange and the lower flange and are used for inserting bolts for connection.
Preferably, the detachable clamping device and the side locating piece are made of stainless steel.
Preferably, the side positioning member is semi-circular, the width of the side positioning member along the length direction of the incident rod is 2.5cm, and the thickness along the radial direction of the incident rod is related to the matched test piece size, and the thickness= (Hopkinson incident rod diameter D-test piece diameter D)/2.
The beneficial effects of the invention are as follows:
1) The detachable clamping device is simple in structure, low in manufacturing cost and beneficial to mass production and popularization and use.
2) Installation and dismantlement, convenient operation can guarantee the precision of device location simultaneously.
3) The side locating pieces with different radial thicknesses can meet the locating requirements of test pieces with different sizes, and the application range is wide.
4) The device belongs to an auxiliary device outside the Hopkinson bar test platform, and is convenient for periodic maintenance and replacement after damage.
Drawings
Fig. 1 is a schematic three-dimensional structure of the present invention.
Fig. 2 is a front view of the present invention.
Fig. 3 is a side view of the present invention.
FIG. 4 is a view of the apparatus for a test piece having a diameter of 80 mm.
FIG. 5 is a view of a device for a 75mm diameter test piece.
FIG. 6 is a view of a device for a test piece having a diameter of 50 mm.
In the figure, a 1-Hopkinson incident rod, a 2-upper sleeve wall, a 3-lower sleeve wall, a 30-supporting structure, a 4-flange, a 5-connecting bolt, a 6-nut, a 7-side positioning piece, an 8-test piece, a 9-loose-leaf hinge and a transmission rod-10.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
A split Hopkinson pressure bar positioning device suitable for multi-size test pieces is shown in fig. 1 and 2, and comprises a detachable clamping device and a side positioning piece 7. The detachable clamping device consists of an upper sleeve wall 2 and a lower sleeve wall 3, is in a semi-cylindrical shape, is made of stainless steel, has the same inner diameter as that of a Hopkinson incidence rod 1, and has the thickness of 1mm, the length of the upper sleeve wall 2 is 5cm, the lower sleeve wall 3 is provided with a supporting structure 30 protruding from the upper sleeve wall 2 at the end where a test piece 8 is positioned, and is used for supporting a side locating piece 7, and the length of the lower sleeve wall 3 is 7.5cm. One side of the upper sleeve wall 2 and one side of the lower sleeve wall 3 are connected into a whole through a loose-leaf hinge 9, and the other side can be opened and closed according to requirements.
When the device is used, the upper sleeve wall and the lower sleeve wall are sleeved at one end of the incident rod, which is contacted with the test piece, so that the rightmost end of the upper sleeve wall is overlapped with the rightmost end of the incident rod, then the upper sleeve wall and the lower sleeve wall 2 and 3 are folded, the flanges 4 of the upper sleeve wall and the lower sleeve wall are parallel to each other, the connecting bolts 5 are inserted into the upper sides of the corresponding two bolt holes, and the nuts 6 are screwed on the lower sides, so that the upper sleeve wall and the lower sleeve wall 2 and 3 are fixed on the incident rod 1.
The side locating piece 7 is a semicircular stainless steel member, the outer diameter of the side locating piece is the same as the inner diameter of the lower sleeve wall 3, the side locating piece is used as a surface matched with the supporting structure 30, and the inner side of the side locating piece is a test piece locating arc surface contacted with a test piece. The side locating pieces adopted for the test pieces with different diameters are different in size, the width along the length direction of the incidence rod is 2.5cm, the height is half of the diameter of the incidence rod, and the thickness is adjusted according to the diameter of the test piece:
when the diameter of the incident rod is 100mm and the diameter of the test piece is 80mm, a side positioning piece with the thickness of 10mm can be adopted, as shown in fig. 3;
when the diameter of the incident rod is 100mm and the diameter of the test piece is 75mm, a side positioning piece with the thickness of 12.5mm can be adopted, as shown in fig. 4;
when the diameter of the incident rod is 100mm and the diameter of the test piece is 50mm, a side locating piece with the thickness of 25mm can be adopted, as shown in fig. 5;
the corresponding side locating piece 7 is placed on the end part of the lower sleeve 3 protruding out of the upper sleeve wall 2, the left surface of the side supporting piece is clung to the right end surface of the incidence rod 1, then the test piece 8 is placed above the side locating piece, the transmission rod 10 is pushed to the left side, the left end surface of the transmission rod 10 is clung to the right end surface of the test piece 8, then the nut 6 is loosened, the connecting bolt 5 is taken out of the screw hole, the upper sleeve, the lower sleeve and the side locating piece are taken out of the Hopkinson pressure bar device, at the moment, the test piece 8 clamped between the incidence rod 1 and the transmission rod 10 is accurately located, and the center of the test piece 8 is ensured to be in a straight line with the center of the incidence rod 1 and the center of the transmission rod 10.
The above embodiments are merely examples of the present invention, but the present invention is not limited thereto, and any changes or modifications made by those skilled in the art are included in the scope of the present invention.
Claims (4)
1. The split Hopkinson pressure bar positioning device suitable for the multi-size test piece is characterized by comprising a detachable clamping device and a side positioning piece matched with the diameter difference of the test piece and the diameter difference of an incident bar; the detachable clamping device consists of an upper sleeve wall and a lower sleeve wall, one side of the upper sleeve wall and one side of the lower sleeve wall are connected into a whole through a hinge, and the other side of the upper sleeve wall and the other side of the lower sleeve wall can be opened and closed as required and are provided with a connecting structure; the inner diameters of the upper sleeve wall and the lower sleeve wall are equal to the diameter of the incident rod, and the lower sleeve wall is provided with a supporting structure for supporting the side locating piece; the side locating piece is provided with a surface matched with the supporting structure and a test piece locating arc surface contacted with the test piece;
the upper sleeve wall and the lower sleeve wall in the detachable clamping device are semi-cylindrical, and the lower sleeve wall protrudes out of the upper sleeve wall at one end of the test piece to serve as the supporting structure;
the connection structure includes: the free edges of the upper sleeve and the lower sleeve are respectively provided with a flange, when the upper sleeve and the lower sleeve are closed, the flanges are mutually parallel, and two threaded holes with the same size are formed in the same position of the upper flange and the lower flange and are used for inserting bolts for connection.
2. The split Hopkinson pressure bar positioning device for a multi-size test piece according to claim 1, wherein the thicknesses of the upper sleeve wall and the lower sleeve wall are 1mm, the upper sleeve wall is 5cm long, and the lower sleeve wall is 7.5cm long.
3. The split hopkinson bar positioning apparatus for use in a multi-size test piece as claimed in claim 1, wherein the detachable clamping device and the side positioning member are made of stainless steel.
4. The split hopkinson bar positioning means for multi-size test pieces according to claim 1, wherein the side positioning member is semi-circular, the width of the side positioning member along the length direction of the incident bar is 2.5cm, and the thickness along the radial direction of the incident bar is related to the size of the test piece to be matched, and the thickness= (hopkinson incident bar diameter D-test piece diameter D)/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811388020.5A CN109323919B (en) | 2018-11-21 | 2018-11-21 | Separated Hopkinson pressure bar positioning device suitable for multi-size test piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811388020.5A CN109323919B (en) | 2018-11-21 | 2018-11-21 | Separated Hopkinson pressure bar positioning device suitable for multi-size test piece |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109323919A CN109323919A (en) | 2019-02-12 |
| CN109323919B true CN109323919B (en) | 2023-12-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811388020.5A Active CN109323919B (en) | 2018-11-21 | 2018-11-21 | Separated Hopkinson pressure bar positioning device suitable for multi-size test piece |
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| Country | Link |
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| CN (1) | CN109323919B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579413A (en) * | 2019-06-28 | 2019-12-17 | 天津大学 | variable-rod-diameter Hopkinson pressure bar experiment device and method |
| CN112577813B (en) * | 2020-12-04 | 2022-04-12 | 西南交通大学 | Be used for disconnect-type hopkinson depression bar test piece positioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082031A (en) * | 2000-09-05 | 2002-03-22 | Ishikawajima Harima Heavy Ind Co Ltd | Hopkinson bar testing apparatus |
| CN203148775U (en) * | 2013-03-26 | 2013-08-21 | 河南科技大学 | Abraded sample positioning device of Hopkinson pressure bar |
| CN203148770U (en) * | 2013-03-26 | 2013-08-21 | 河南科技大学 | Compressed sample positioning device of Hopkinson pressure bar |
| CN103454141A (en) * | 2013-08-13 | 2013-12-18 | 中国人民解放军陆军军官学院 | Positioning device for supporting and radially adjusting split hopkinson bar |
| CN106198190A (en) * | 2016-07-06 | 2016-12-07 | 合肥工业大学 | A kind of Hopkinson pressure bar experiment sample collection device |
| CN106483028A (en) * | 2016-11-23 | 2017-03-08 | 山东非金属材料研究所 | A kind of Hopkinson pressure bar test device |
| CN106769415A (en) * | 2017-01-13 | 2017-05-31 | 绍兴文理学院 | It is adapted to the Hopkinson bar supporting arrangement of many sized samples |
| CN106840861A (en) * | 2017-01-13 | 2017-06-13 | 绍兴文理学院 | Dynamic rock mechanics tests various sizes of sample positioning device |
| CN206556985U (en) * | 2017-01-13 | 2017-10-13 | 绍兴文理学院 | It is adapted to the Hopkinson bar supporting arrangement of many sized samples |
| CN107271299A (en) * | 2017-06-08 | 2017-10-20 | 安徽理工大学 | A kind of device for being used in SHPB diametral compression tests lay different sized samples |
| CN107941606A (en) * | 2017-12-22 | 2018-04-20 | 青岛西交检验检测科技有限公司 | A kind of separate type Hopkinson pull rod test fixture |
| CN209311212U (en) * | 2018-11-21 | 2019-08-27 | 浙江大学 | A kind of split hopkinson press bar positioning device suitable for more size test specimens |
-
2018
- 2018-11-21 CN CN201811388020.5A patent/CN109323919B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082031A (en) * | 2000-09-05 | 2002-03-22 | Ishikawajima Harima Heavy Ind Co Ltd | Hopkinson bar testing apparatus |
| CN203148775U (en) * | 2013-03-26 | 2013-08-21 | 河南科技大学 | Abraded sample positioning device of Hopkinson pressure bar |
| CN203148770U (en) * | 2013-03-26 | 2013-08-21 | 河南科技大学 | Compressed sample positioning device of Hopkinson pressure bar |
| CN103454141A (en) * | 2013-08-13 | 2013-12-18 | 中国人民解放军陆军军官学院 | Positioning device for supporting and radially adjusting split hopkinson bar |
| CN106198190A (en) * | 2016-07-06 | 2016-12-07 | 合肥工业大学 | A kind of Hopkinson pressure bar experiment sample collection device |
| CN106483028A (en) * | 2016-11-23 | 2017-03-08 | 山东非金属材料研究所 | A kind of Hopkinson pressure bar test device |
| CN106769415A (en) * | 2017-01-13 | 2017-05-31 | 绍兴文理学院 | It is adapted to the Hopkinson bar supporting arrangement of many sized samples |
| CN106840861A (en) * | 2017-01-13 | 2017-06-13 | 绍兴文理学院 | Dynamic rock mechanics tests various sizes of sample positioning device |
| CN206556985U (en) * | 2017-01-13 | 2017-10-13 | 绍兴文理学院 | It is adapted to the Hopkinson bar supporting arrangement of many sized samples |
| CN107271299A (en) * | 2017-06-08 | 2017-10-20 | 安徽理工大学 | A kind of device for being used in SHPB diametral compression tests lay different sized samples |
| CN107941606A (en) * | 2017-12-22 | 2018-04-20 | 青岛西交检验检测科技有限公司 | A kind of separate type Hopkinson pull rod test fixture |
| CN209311212U (en) * | 2018-11-21 | 2019-08-27 | 浙江大学 | A kind of split hopkinson press bar positioning device suitable for more size test specimens |
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