CN110926927B - Flip formula hopkinson pole confined pressure device - Google Patents
Flip formula hopkinson pole confined pressure device Download PDFInfo
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- CN110926927B CN110926927B CN201911217605.5A CN201911217605A CN110926927B CN 110926927 B CN110926927 B CN 110926927B CN 201911217605 A CN201911217605 A CN 201911217605A CN 110926927 B CN110926927 B CN 110926927B
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- 239000012528 membrane Substances 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 17
- 239000005871 repellent Substances 0.000 claims abstract 4
- 238000007789 sealing Methods 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 abstract description 33
- 239000003921 oil Substances 0.000 description 128
- 239000010720 hydraulic oil Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000009863 impact test Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000010727 cylinder oil Substances 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011160 research 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
- G01N3/02—Details
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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
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Abstract
本发明提供的翻盖式霍普金森压杆围压装置，包括上油缸、下油缸、隔油橡胶膜，所述上油缸、下油缸为对称设置的空心半圆柱形，上下油缸的直径所在平面分别设置有与上、下油缸同轴线的半圆柱面，使上下油缸合拢成圆柱后沿圆柱轴线形成中心通道，作为安装岩石试样的试样室，且上下油缸开设有与该试样室相通的开口，所述隔油橡胶膜用于将该开口与试样室间密封。本发明解决了三维SHPB试验中试验效率较低的问题。
The flip-top type Hopkinson pressure rod confining pressure device provided by the present invention includes an upper oil cylinder, a lower oil cylinder and an oil-separating rubber membrane, wherein the upper and lower oil cylinders are symmetrically arranged hollow semi-cylindrical cylinders, and the planes where the diameters of the upper and lower oil cylinders are located are respectively There is a semi-cylindrical surface coaxial with the upper and lower oil cylinders, so that the upper and lower oil cylinders are closed into a cylinder and a central channel is formed along the axis of the cylinder as a sample chamber for installing rock samples, and the upper and lower oil cylinders are open with the sample chamber. The oil-repellent rubber membrane is used to seal the opening with the sample chamber. The invention solves the problem of low test efficiency in the three-dimensional SHPB test.
Description
Technical Field
The invention relates to the field of material power experiment testing equipment, in particular to a flip type Hopkinson bar confining pressure device.
Background
In geotechnical engineering, mining engineering and protection engineering, dynamic loads caused by blasting and earthquake are often encountered, so that the rock material is under the dynamic load with high strain rate, and the mechanical property and the deformation failure mechanism of the rock material under the dynamic load are urgently required to be researched. The Split Hopkinson Pressure Bar (SHPB) has been widely used internationally to test materials for high strain rate (10-10)4s-1) The dynamic characteristics of (1). Based on the one-dimensional stress wave theory, the initial separated Hopkinson pressure bar can only be used for testing the dynamic characteristics of the material in the one-dimensional stress state. However, in practical engineering practice, due to the action of self-weight stress and constructional stress, rock materials are often in a complex three-dimensional stress state, so that the confining pressure device for the three-dimensional Hopkinson bar experiment needs to be developed.
A three-dimensional Hopkinson bar experimental device capable of being used for realizing simultaneous loading of rock materials under three-dimensional dynamic and static combined load is provided in an article published by the Lenshina professor 2008 of China university in rock mechanics and engineering news and entitled dynamic and static combined loading mechanical property research, the experimental device can realize simultaneous loading of axial static pressure of 0-200 MPa, confining pressure of 0-200 MPa and impact dynamic load of 0-500 MPa, and the strain rate of a sample is 100～103s-1And (4) section. The confining pressure device comprises a cylindrical oil cylinder with left and right sealing covers, an oil isolating rubber sleeve, an oil inlet and outlet hole, a manual hydraulic oil pump, a pressure-resistant oil pipe and the like. In the three-dimensional SHPB power experiment, oil is added into the oil cylinder through manual pressurization to discharge gas in the oil cylinder until the oil flows out from an outlet, and the oil cylinder is indicatedAnd (4) filling oil, closing the oil outlet valve at the moment, continuously pressurizing to enable the hydraulic pressure in the cylinder to rise, and controlling the lateral confining pressure of the sample through the pressure gauge. And after the impact test is finished, opening the oil inlet and outlet valve of the oil cylinder to enable the hydraulic oil to flow back. The confining pressure device can realize a three-dimensional SHPB dynamics test, but the actual test operation process finds that the device also has obvious defects that firstly, oil is required to be added to the oil cylinder manually in each test, the automatic backflow process of hydraulic oil is very slow, and the test efficiency is reduced. And secondly, the confining pressure oil cylinder is designed into a left sealing cover and a right sealing cover, the left sealing cover and the right sealing cover are tightly sealed with the incident rod and the transmission rod, so that the left and right sealing covers are very difficult to move when a sample is mounted and dismounted in each test, and the test efficiency is reduced again. The above two reasons result in a complete three-dimensional SHPB test which takes approximately 3-4 hours and is very inefficient.
Chinese patent CN201110200000.2 discloses a hopkinson rod confining pressure device for stabilizing pressure. The device mainly comprises a confining pressure device and a pressure stabilizing device. The confining pressure device mainly comprises a hydraulic oil cylinder, an oil-separating rubber sleeve, an O-shaped sealing ring and the like. The confining pressure device changes the design of left and right sealing covers of the existing oil cylinder, the oil cylinder is designed into an upper sealing cover and a lower sealing cover of an upper part and a lower part, and the oil cylinder is sealed by adopting O-shaped rubber rings, but an oil separation rubber sleeve is fixed on a lower part through a clamping ring, and the upper part and the lower part jointly form a confining pressure chamber. The confining pressure device also has obvious defects: firstly, the effect of sealing the upper part and the lower part by adopting the O-shaped rubber ring is not good; secondly, because the oil removal rubber sleeve is as a whole for the process of sample installation and dismantlement is more complicated, and can not pinpoint the position of sample, consequently also can lead to test efficiency lower.
Disclosure of Invention
The invention aims to provide a flip type Hopkinson bar confining pressure device aiming at the defects of the prior art, so as to solve the problem of low test efficiency caused by the fact that manual oiling is needed in each test and the device is inconvenient to disassemble in a three-dimensional SHPB test, simplify the process of installing and disassembling a sample and improve the test efficiency.
The invention provides a flip-type Hopkinson pressure bar confining pressure device which comprises an upper oil cylinder, a lower oil cylinder and two oil separation rubber membranes, wherein the upper oil cylinder and the lower oil cylinder are used for containing confining pressure oil; the upper oil cylinder and the lower oil cylinder are two hollow semi-circular ring bodies which are symmetrically arranged, the two semi-circular ring bodies are folded to form a circular ring body, a circular channel with the same central axis is formed in the center of the circular ring body, and the diameter of the channel is matched with the size of a rock sample to be used as a sample chamber for mounting the rock sample; two symmetrical openings communicated with the sample chamber are respectively formed in the middle parts of the inner arc wall surfaces of the upper oil cylinder and the lower oil cylinder, the two oil separation rubber films respectively seal the openings on the upper oil cylinder and the lower oil cylinder to separate the sample chamber from the space in the oil cylinders, and independent annular confining chambers are formed inside the upper oil cylinder and the lower oil cylinder.
The hollow semi-circular ring body is a cylinder with a semicircular cross section, and the inside of the cylinder is hollow.
The central axis refers to the straight line where the circle centers of the semicircular columns are located, namely the longitudinal axis.
Furthermore, the openings on the upper oil cylinder and the lower oil cylinder penetrate through the inner arc wall surface around the circumference of the inner arc wall surface, and the width of the openings along the axis direction of the semi-cylindrical center is larger than or equal to the length of the rock sample which is installed in the sample chamber and then along the axis direction of the center.
The inner arc wall surface circumference direction refers to the transverse direction of the semi-circular column.
Furthermore, the upper oil cylinder and the lower oil cylinder are connected at the edge of one side of the semicircular ring body through a hinge, so that the two semicircular ring cylinder oil cylinders are opened and closed, and the sample chamber is opened and closed simultaneously. The number of the hinges is 2-4, and the hinges are determined according to the axial length of the oil cylinder. The hinge connection enables the upper oil cylinder to be turned over relative to the lower oil cylinder, and the sample chamber is opened and closed.
Furthermore, the other side edge of the upper oil cylinder and the lower oil cylinder, which is symmetrical to the hinge connection edge, is provided with a connection outer edge, the connection outer edge is provided with screw holes which are symmetrical up and down, and the screw penetrates through the screw holes to be matched with the nut to detachably connect the upper oil cylinder and the lower oil cylinder. When the test is carried out, the upper oil cylinder and the lower oil cylinder are tightly connected through the screws, and after the test is finished, the screws are disassembled, so that a test room can be opened. Therefore, manual oiling is not needed in multiple tests, and only the pressure of hydraulic oil needs to be adjusted or the test needs to be replaced, so that the test operation is simplified, and the test efficiency is improved.
Furthermore, the two oil-separating rubber films respectively and completely cover the openings of the upper oil cylinder and the lower oil cylinder, and the edges of the two oil-separating rubber films are fixed on the wall surfaces of the upper oil cylinder and the lower oil cylinder around the openings to seal the openings.
Furthermore, the wall surfaces around the openings of the upper oil cylinder and the lower oil cylinder are provided with a groove surrounding the openings for a circle according to the size of the oil-separation rubber film, and a compression ring matched with the shape and the size of the groove, the oil-separation rubber film covers the openings, the compression ring is embedded into the groove to press the edge of the oil-separation rubber film into the groove, and then the compression ring is fixed in the groove by penetrating through the compression ring through a screw, so that the fixation of the oil-separation rubber film and the sealing of the openings are realized.
Furthermore, in the groove, two annular water stop belts matched with the direction of the groove are arranged below the oil-separating rubber membrane, the two water stop belts are respectively positioned on two sides of the screw, and the oil-separating rubber membrane and the water stop belts are tightly pressed in the process that the screw penetrates through the compression ring and is nailed into the groove, so that oil-separating sealing is realized.
Preferably, the oil-separating rubber membrane is a square edge, the groove is square, the annular water stop belt is a square ring with the same direction as the groove, and the large and small water stop belts are respectively positioned in the groove in the form of an inner ring and an outer ring. The water stop is preferably made of rubber with good sealing effect.
Furthermore, the upper oil cylinder is provided with an upper oil inlet and outlet hole and an upper exhaust hole, and the lower oil cylinder is provided with a lower oil inlet and outlet hole and a lower exhaust hole; the lower oil inlet and outlet hole is designed in the center of the bottom of the lower oil cylinder, and the lower exhaust hole is arranged at the highest position on the cylindrical surface of the lower oil cylinder.
Furthermore, the shape of the oil-separating rubber film is matched with the sample, and the sample is completely coated after the upper oil cylinder and the lower oil cylinder are closed.
Preferably, the oil-separating rubber sleeve is in a semicircular arc shape which is the same as the semicircular arc wall surface of the sample chamber, the shape of the oil-separating rubber sleeve is matched with that of the sample, the radius of the oil-separating rubber sleeve is slightly larger than that of the sample, and the oil-separating rubber sleeve is tightly attached to a test after the sample is placed in the oil-separating rubber sleeve and oil pressure is applied. The rubber sleeve can be in other shapes matched with the sample, and the rubber material is selected from rubber materials with excellent elastic deformation capacity, so that the rubber sleeve can be tightly attached to the sample in the confining pressure applying process.
The base is composed of a bottom plate and four supporting rods, every two supporting rods are in a group, the supporting rods are symmetrically and vertically fixed on the bottom plate, and the bottoms of the oil cylinders are fixedly connected with each other at the top ends of the supporting rods.
Further, the oil inlet/outlet hole and the exhaust hole are provided with switch valves.
Compared with the prior art, the invention has the following beneficial effects:
1. the device adopts the design of an upper and a lower flip cover, the upper and the lower oil cylinders are mutually independent, but simultaneously, the upper and the lower oil cylinders jointly act to form circumferential confining pressure on the sample, the upper and the lower oil cylinders are tightly covered by hinges and screws, the design of the flip cover can ensure that the sample is very convenient to mount and dismount in the test process, the problem that the left and the right seal covers are difficult to move left and right due to sealing in the design of the left and the right seal covers is avoided, the time is greatly saved, and the test efficiency is improved.
2. The oil cylinders on the upper part and the lower part of the device work independently, so that all hydraulic oil in the oil cylinders is not required to be discharged after each test is finished, the hydraulic oil in the oil cylinders can be kept in a full-capacity and non-pressure state, and the upper oil cylinder and the lower oil cylinder are only required to be pressurized to specified pressure at the same time until the next test. By the operation, the injection and discharge time of the hydraulic oil is saved, and the test efficiency is further improved.
3. The device disclosed by the invention is simple in structure, convenient to install, good in sealing effect, convenient to accurately position the sample position, and suitable for three-dimensional SHPB tests of rock materials.
Drawings
FIG. 1 is a longitudinal sectional view of a confining pressure device according to the present invention;
FIG. 2 is a side view of the confining pressure device of the present invention;
FIG. 3 is a bottom view of the upper cylinder of the confining pressure device of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
fig. 5 is a partially enlarged view of the oil-barrier rubber membrane, the pressing block, and the annular water stop.
In the figure, 1, an oil cylinder is arranged; 2, a lower oil cylinder; 3-upper oil inlet and outlet holes; 4-lower oil inlet and outlet holes; 5, an upper exhaust hole; 6-lower vent hole; 7-incident rod; 8-a transmission rod; 9-rock sample; 10-oil-separating rubber film; 11-water stop; 12-a compression ring; 13-a screw; 14-screw hole; 15-hinge.
Detailed Description
The confining pressure device of the invention is further explained by the following specific embodiments.
Example 1
The structure of the flip-type Hopkinson pressure bar confining pressure device of the embodiment is shown in figures 1-5, and comprises an upper oil cylinder 1 and a lower oil cylinder 2 for containing confining pressure oil, and two oil separation rubber membranes 10; the upper oil cylinder and the lower oil cylinder are two hollow semi-circular ring bodies which are symmetrically arranged, the two semi-circular ring bodies are folded to form a circular ring body, a circular channel with the same central axis is formed in the center, and the diameter of the channel is matched with the size of a rock sample to be used as a sample chamber for mounting the rock sample 9; two symmetrical openings communicated with the sample chamber are formed in the middle of the inner arc wall surfaces of the upper oil cylinder and the lower oil cylinder, the openings penetrate through the inner arc wall surfaces around the circumferential direction of the inner arc wall surfaces, and the width of the openings along the axis direction of the semi-cylindrical center is larger than or equal to the length of the rock sample mounted in the sample chamber along the axis direction of the center. The two oil-separating rubber films respectively and completely cover the openings of the upper oil cylinder and the lower oil cylinder, and the edges of the two oil-separating rubber films are fixed on the wall surfaces of the upper oil cylinder and the lower oil cylinder around the openings to seal the openings. Specifically, a groove which surrounds the opening in a circle and is square and a compression ring 12 which is matched with the groove in shape and size are arranged on the wall surfaces around the openings of the upper oil cylinder and the lower oil cylinder according to the size of the oil-separating rubber film, the oil-separating rubber film covers the opening, the compression ring is embedded into the groove to press the edge of the oil-separating rubber film into the groove, and then the compression ring is fixed in the groove by penetrating through the compression ring through a screw 13, so that the fixation of the oil-separating rubber film and the sealing of the opening are realized. In order to improve the sealing performance, in the groove, two annular water stop belts 11 matched with the trend of the groove are arranged below the oil-separating rubber membrane, the two water stop belts are respectively positioned on two sides of the screw, and the oil-separating rubber membrane and the water stop belts are tightly pressed in the process that the screw penetrates through the compression ring and is nailed into the groove, so that oil-separating sealing is realized. The number of the screws is one at a certain distance, so that the clamp ring and the rubber film can be firmly fixed. The oil-separating rubber membrane is made of rubber with good elastic deformation capacity, the main body is in a semi-arc shape matched with the cylindrical sample, the upper oil cylinder and the lower oil cylinder completely wrap the sample after being folded, and the sample is tightly attached to the surface of the sample after confining pressure is applied.
The upper oil cylinder and the lower oil cylinder are connected at the edge of one side of the semicircular ring body through a hinge 15, so that the two semicircular ring cylinder oil cylinders are opened and closed, and the sample chamber is opened and closed simultaneously. The other side edge of the upper oil cylinder and the lower oil cylinder, which is symmetrical to the hinge connection edge, is provided with a connection outer edge, the connection outer edge is provided with screw holes 14 which are symmetrical up and down, and the screw penetrates through the screw holes to be matched with a nut to detachably connect the upper oil cylinder and the lower oil cylinder. The upper oil cylinder is provided with an upper oil inlet and outlet hole 3 and an upper exhaust hole 5, and the lower oil cylinder is provided with a lower oil inlet and outlet hole 4 and a lower exhaust hole 6; the lower oil inlet and outlet hole 4 is designed in the center of the bottom of the lower oil cylinder 2, and the lower exhaust hole 6 is arranged at the highest position on the cylindrical surface of the lower oil cylinder 2.
The base comprises bottom plate and four spinal branch vaulting poles, two liang of spinal branch vaulting poles are a set of, and the symmetry is erect and is fixed on the bottom plate, and the bottom fixed connection of hydro-cylinder under the top of spinal branch vaulting pole.
Example 2
In this example, a three-dimensional SHPB confining pressure test was performed by the following specific operations:
(1) the annular rubber water stop belt 11 and the oil-separating rubber membrane 10 are placed according to the installation sequence, the compression ring 12 is fixed by the screw 13, and the sealing rubber sleeve 10 and the annular rubber water stop belt 11 are compressed to form an upper confining pressure chamber and a lower confining pressure chamber.
(2) And placing the sample 9 in the middle of an oil-separating rubber film of a lower oil cylinder in the sample chamber, and moving the incident rod 7 and the transmission rod 8 to the end faces of two ends of the sample 9.
(3) The upper oil cylinder 1 is turned over through a hinge, and the upper oil cylinder 1 and the lower oil cylinder 2 are tightly covered by a screw 13.
(4) And adding hydraulic oil to the upper oil cylinder 1 and the lower oil cylinder 2 through the upper oil inlet and outlet hole 3 and the lower oil inlet and outlet hole 4 at the same time until hydraulic oil flows out of the upper exhaust hole 5 and the lower exhaust hole 6, marking that the hydraulic oil is full, closing the upper exhaust hole 5 and the lower exhaust hole 6 at the moment, and pressurizing the upper oil cylinder 1 and the lower oil cylinder 2 to the same specified confining pressure.
(5) And adjusting a triggering device and a data collecting device of the SHPB to perform a three-dimensional SHPB impact test.
(6) After the impact test is finished, the upper oil inlet and outlet hole 5 and the lower oil inlet and outlet hole 6 are opened, the oil pressure drop of the upper oil pressure chamber and the lower oil pressure chamber is 0, the upper oil inlet and outlet hole 5 and the lower oil inlet and outlet hole 6 can be closed at the moment, the oil pressure chamber is pressurized for the next test, and the time for filling and discharging the hydraulic oil into and out of the oil pressure chamber is saved.
Claims (6)
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| CN201911217605.5A CN110926927B (en) | 2019-12-03 | 2019-12-03 | Flip formula hopkinson pole confined pressure device |
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| CN201911217605.5A CN110926927B (en) | 2019-12-03 | 2019-12-03 | Flip formula hopkinson pole confined pressure device |
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| CN110926927B true CN110926927B (en) | 2021-03-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111474067B (en) * | 2020-04-15 | 2022-10-25 | 辽宁科技大学 | A Hopkinson Pressure Bar Test System Simulating Fluid Environment |
| CN111678806B (en) * | 2020-05-11 | 2023-06-02 | 江苏禹治流域管理技术研究院有限公司 | SHPB rock shear test device and method under normal stress condition |
| CN112268806B (en) * | 2020-10-14 | 2023-04-14 | 合肥工业大学 | A Confining Pressure Loading Device Based on Separated Hopkinson Compression Bar |
| CN113390725B (en) * | 2021-06-09 | 2022-03-04 | 河海大学 | Hopkinson bar confining pressure control and testing system and method for soil dynamics |
| CN113776961A (en) * | 2021-08-31 | 2021-12-10 | 重庆交通大学 | Temperature and pressure synchronous loading device and method suitable for rock dynamics test |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331366B (en) * | 2011-07-18 | 2012-10-24 | 河海大学 | Hopkinson bar active pressure confining device for stabilizing pressure |
| CN202837089U (en) * | 2012-09-29 | 2013-03-27 | 张磊 | Confinement cylinder device of Hopkinson pressure bar active confinement experiment |
| KR101727405B1 (en) * | 2015-10-28 | 2017-05-02 | 전북대학교산학협력단 | Modification of Hoek triaxial cell for SHPB tests and its application to dynamic shear strength measurement of brittle materials |
| CN105758704B (en) * | 2016-02-23 | 2018-12-14 | 繁昌县菲德通讯材料设计有限公司 | A kind of Hopkinson pressure bar confining pressure test device |
| CN206772734U (en) * | 2017-03-06 | 2017-12-19 | 中国矿业大学(北京) | A kind of rock Hopkinson dynamic impulsion loading device based on the loading of three axles |
| CN107255598B (en) * | 2017-07-05 | 2020-01-07 | 安徽理工大学 | A confining pressure device for easy removal of soil samples in Hopkinson test |
| CN207816727U (en) * | 2017-12-20 | 2018-09-04 | 北京科技大学 | A kind of portable self sealss rock SHPB experiments confining pressure pressue device |
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