CN209945901U - Test device for double-sided shearing of concrete material by Hopkinson bar - Google Patents
Test device for double-sided shearing of concrete material by Hopkinson bar Download PDFInfo
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- CN209945901U CN209945901U CN201920658944.6U CN201920658944U CN209945901U CN 209945901 U CN209945901 U CN 209945901U CN 201920658944 U CN201920658944 U CN 201920658944U CN 209945901 U CN209945901 U CN 209945901U
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Abstract
The utility model provides a Hopkinson bar carries out test device of two-sided shearing of concrete material, including transmitting the pole, the cover has the hollow sleeve who fixes mutually with transmitting the pole on the transmission pole front end, the solid round platform of fixedly connected with on the hollow sleeve front end, solid round platform front end is equipped with the incident pole, it is equipped with two-sided shearing test piece to press from both sides between incident pole rear end and the solid round platform, be fixed with the absorption pole on the transmission pole rear end. The utility model discloses simple structure, reasonable in design has enlarged member cross sectional dimension by a wide margin, can realize the two-sided shear test of concrete material on the hopkinson pole, more can effectively reflect the actual dynamic shear performance of concrete, and stability is high and the usability is strong, improves test efficiency, has the novelty.
Description
Technical Field
The utility model relates to a Hopkinson bar carries out two-sided shearing's of concrete material test device.
Background
The existing Split Hopkinson Pressure Bar (SHPB) technology is considered to be one of the most effective methods for measuring the dynamic characteristics of solid materials, the strain rate of the fabricated concrete structure under the action of earthquake load is within the testable range of the Hopkinson bar, the symmetry and the stress uniformity of a double-sided shear test piece are considered, and the Hopkinson bar is adopted for carrying out a double-sided shear test on the fabricated composite beam.
The size of coarse aggregate contained in a concrete material is large, the material is non-uniform, so that the measurement result of a small test piece cannot effectively reflect the macroscopic statistical law of the small test piece, and in order to ensure the validity of test data, the test error is reduced by generally adopting a method for increasing the size of the test piece, so that the cross section size of a compression bar of an SHPB test device shows an increasing trend.
Some earlier test devices achieved the same test result by varying the cross-sectional dimensions of the input rod (variable cross-section strut). However, the increase of the section size of the pressure rod can also increase the transverse inertia of the stress wave in the pressure rod and cause the increase of the dispersion effect of the stress wave, and the friction effect between the test piece and the end face of the pressure rod is more obvious.
Meyer (application of adiabatic shear strength, shock wave and high strain rate phenomena of low alloy steel under compressive load in the field of alloy, Meyer edition, New York, 1986: 647-657.) A hat-shaped structural sample for realizing shear loading by axial impact compression is used, and the impact shear failure strength of a local position of a material is measured by the design of self-shearing of the sample. The method has the advantages that the required sample has a complex structure and high preparation difficulty, particularly anisotropic materials such as composite materials are difficult to realize, and the complexity of the sample makes the test and data processing more complex and difficult.
Based on metal material's above dynamic shear device, current SHPB test device cross-sectional dimension is less, restricts the concrete sample size, carries out the two-sided shear test effect of concrete material not good, can't more effectively react concrete shear plane macroscopic dynamic performance.
SUMMERY OF THE UTILITY MODEL
The utility model discloses improve above-mentioned problem, promptly the to-be-solved technical problem of the utility model is to provide a Hopkinson bar carries out the test device of the two-sided shearing of concrete material, dismantles simply and convenient to use.
The utility model discloses a concrete implementation scheme is: the utility model provides a Hopkinson bar carries out test device of two-sided shearing of concrete material, including transmitting the pole, the cover has the hollow sleeve who fixes mutually with transmitting the pole on the transmission pole front end, the solid round platform of fixedly connected with on the hollow sleeve front end, solid round platform front end is equipped with the incident pole, press from both sides between incident pole rear end and the solid round platform and be equipped with two-sided shearing test piece, be fixed with the absorption rod on the transmission pole rear end.
Furthermore, the solid round platform comprises an upper round surface and a lower round surface, the diameter of the upper round surface is smaller than that of the lower round surface, the upper round surface of the solid round platform is fixedly connected with the hollow sleeve, and the hollow sleeve is in plug fit with the transmission rod.
Furthermore, the solid round table and the hollow sleeve are integrated.
Furthermore, the inner diameter of the hollow sleeve is larger than the outer diameter of the transmission rod, a raw belt material is wound on the end part of the transmission rod, and a strong adhesive tape used for fixing the transmission rod and the hollow sleeve is wound at the joint of the transmission rod and the hollow sleeve after the hollow sleeve is connected with the transmission rod.
Furthermore, the central lines of the incident rod, the double-sided shearing test piece, the solid circular truncated cone, the sleeve, the transmission rod and the absorption rod are positioned on the same horizontal line.
Furthermore, the solid round table and the hollow sleeve are made of Q235 steel.
Furthermore, the front end of the incident rod is provided with a bullet and a launching device for driving the bullet to launch.
Further, a damper for consuming kinetic energy is arranged at the rear end of the absorption rod.
Furthermore, the incident rod and the transmission rod are provided with strain gauges which are electrically connected with the data processing system.
Compared with the prior art, the utility model discloses following beneficial effect has: the device has the advantages of reasonable design, simple structure, convenient assembly and disassembly, low cost, no influence on the validity of data, high stability and strong usability, is particularly suitable for the research on the dynamic shearing property of composite materials such as concrete and has practicability.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of the connection between the hollow sleeve and the transmission rod according to the embodiment of the present invention;
fig. 3 is the utility model discloses two-sided shear test piece structure sketch map of embodiment.
In the figure: 1-incident rod, 2-transmission rod, 3-double-sided shear test piece, 31-loading end, 32-supporting end, 4-solid circular table, 41-upper circular surface, 42-lower circular surface, 5-absorption rod, 6-bullet, 7-damper, 8-launching device, 9-data processing system, 10-hollow sleeve and 11-strain gauge.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the embodiment, as shown in fig. 1 ~ 3, the test device for performing double-sided shearing on a concrete material by using a hopkinson bar in the embodiment includes a transmission bar 2, a hollow sleeve 10 fixed to the transmission bar is sleeved on the front end of the transmission bar 2, a solid circular truncated cone 4 is fixedly connected to the front end of the hollow sleeve 10, an incident bar 1 is arranged at the front end of the solid circular truncated cone 4, a double-sided shearing test piece 3 is clamped between the rear end of the incident bar 1 and the solid circular truncated cone 4, and an absorption bar 5 is coaxially fixed to the rear end of the transmission bar.
In this embodiment, the double-sided shear test piece 3 includes a loading end 31 and two symmetrical supporting ends 32, and the connection portion between the loading end 31 and the supporting ends is a rectangular shear area.
In this embodiment, the solid circular truncated cone 4 includes an upper circular surface 41 and a lower circular surface 42, the diameter of the upper circular surface is smaller than that of the lower circular surface, the upper circular surface of the solid circular truncated cone is fixedly connected with the hollow sleeve 10, and the hollow sleeve 10 is in insertion fit with the transmission rod 2.
In this embodiment, the solid circular truncated cone 4 and the hollow sleeve 10 may also be integrated.
In this embodiment, the inner diameter of the hollow sleeve 10 is greater than the outer diameter of the transmission rod 2, the inner diameter of the hollow sleeve can be greater than the outer diameter of the transmission rod 2mm, the end of the transmission rod is wound with a raw tape, one end of the transmission rod wound with a raw tape is inserted into the hollow sleeve, and the raw tape can fill a gap between the inside of the hollow sleeve and the transmission rod.
In this embodiment, after the hollow sleeve 10 is connected to the transmission rod 2, a strong adhesive tape for fixing the transmission rod and the hollow sleeve is wound around the joint between the transmission rod and the hollow sleeve, so as to ensure the fixing strength.
In this embodiment, the center lines of the incident rod, the double-sided shear test piece, the solid circular truncated cone, the sleeve, the transmission rod and the absorption rod are located on the same horizontal line.
In this embodiment, the solid round platform and the hollow sleeve are made of Q235 steel, and are durable.
In this embodiment, the front end of the incident rod 1 is provided with a horizontally arranged bullet 6 and a launching device 8 for driving the bullet to be launched.
In this embodiment, the rear end of the absorption bar 5 is provided with a damper 7 for dissipating kinetic energy.
In this embodiment, the incident rod 1 and the transmission rod 2 are provided with strain gauges 11, the strain gauges on the incident rod and the transmission rod are respectively electrically connected to a data processing system 9, and the data processing system 9 may be a virtual oscilloscope installed on a computer.
In the embodiment, when in use, firstly, the levelness and the coaxiality of the incident rod 1 and the transmission rod 2 are adjusted to ensure that the incident rod and the transmission rod are horizontal and coaxial, then the end part of the transmission rod 2 is wound with a raw material belt, the transmission rod 2 is inserted into the hollow sleeve 10 and fixed well, the connecting position of the hollow sleeve 10 and the transmission rod 2 is wound with a strong adhesive tape for further fixing, then clamping and fixing the double-sided shearing test piece 3 between the incident rod and the solid circular truncated cone, adjusting the position of the double-sided shearing test piece to enable the central axes of the incident rod, the double-sided shearing test piece, the solid circular truncated cone, the hollow sleeve and the transmission rod to be positioned at the same horizontal position, after the inspection is finished, and driving a launching device to launch the bullet, collecting, recording and storing the time domain dynamic strain signal by a data processing system (virtual oscilloscope) on the computer, and finally taking down the test piece after the impact test is finished. The utility model discloses simple structure, reasonable in design, easy operation, quick detachable does not influence the impact test that former device depression bar carries out other materials, and is with low costs, promotes test efficiency, does not influence the validity of data, is particularly useful for compound material's such as concrete dynamic shear nature research.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (9)
1. The utility model provides a Hopkinson bar carries out test device of two-sided shearing of concrete material, its characterized in that, including transmitting the pole, the cover has the hollow sleeve who fixes mutually with transmitting the pole on the pole front end of transmitting, fixedly connected with solid round platform on the hollow sleeve front end, solid round platform front end is equipped with the incident pole, it is equipped with two-sided shearing test piece to press from both sides between incident pole rear end and the solid round platform.
2. The device for testing double-sided shearing of concrete materials by the Hopkinson bar according to claim 1, wherein the solid circular truncated cone comprises an upper circular surface and a lower circular surface, the diameter of the upper circular surface is smaller than that of the lower circular surface, the upper circular surface of the solid circular truncated cone is fixedly connected with a hollow sleeve, the hollow sleeve is in plug fit with the transmission bar, and an absorption bar is further fixed at the rear end of the transmission bar.
3. The device for testing double-sided shearing of concrete materials by the Hopkinson bar as recited in claim 2, wherein the solid circular truncated cone and the hollow sleeve are integrated.
4. The device for testing the double-sided shearing of the concrete material by the Hopkinson bar as recited in claim 1 ~ 3, wherein the inner diameter of the hollow sleeve is larger than the outer diameter of the transmission bar, a raw tape for filling the gap between the hollow sleeve and the transmission bar is wound on the end of the transmission bar, and a strong adhesive tape for fixing the transmission bar and the hollow sleeve is wound on the joint of the transmission bar and the sleeve after the hollow sleeve is connected with the transmission bar.
5. The device for testing double-sided shearing of concrete materials by using the Hopkinson bar as claimed in claim 1 ~ 3, wherein the central lines of the incident bar, the double-sided shearing test piece, the solid circular truncated cone, the sleeve, the transmission bar and the absorption bar are located on the same horizontal line.
6. The device for testing the double-sided shearing of a concrete material by using the Hopkinson bar as claimed in claim 1 ~ 3, wherein the solid round table and the hollow sleeve are both made of Q235 steel.
7. The apparatus for double-sided shearing of concrete material by Hopkinson bars as claimed in claim 1 ~ 3, wherein said entrance bar is provided at its front end with a bullet and a firing means for driving the bullet to fire.
8. The device for testing double-sided shearing of concrete materials by the Hopkinson bar according to claim 2 or 3, wherein the rear end of the absorption bar is provided with a damper for reducing kinetic energy.
9. The device for testing the double-sided shearing of the concrete material by the Hopkinson bar as recited in claim 1 to 1 ~ 3, wherein the incident bar and the transmission bar are provided with strain gauges, and the strain gauges are electrically connected with a data processing system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920658944.6U CN209945901U (en) | 2019-05-09 | 2019-05-09 | Test device for double-sided shearing of concrete material by Hopkinson bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920658944.6U CN209945901U (en) | 2019-05-09 | 2019-05-09 | Test device for double-sided shearing of concrete material by Hopkinson bar |
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| Publication Number | Publication Date |
|---|---|
| CN209945901U true CN209945901U (en) | 2020-01-14 |
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|---|---|---|---|
| CN201920658944.6U Expired - Fee Related CN209945901U (en) | 2019-05-09 | 2019-05-09 | Test device for double-sided shearing of concrete material by Hopkinson bar |
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| CN (1) | CN209945901U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057690A (en) * | 2019-05-09 | 2019-07-26 | 福州大学 | Hopkinson bar concrete material dual shear test device and its application method |
| CN113376033A (en) * | 2021-05-07 | 2021-09-10 | 沈阳工业大学 | Method for controlling high-speed impact load pure shear strain |
| CN113945514A (en) * | 2021-10-21 | 2022-01-18 | 中交鹭建有限公司 | SHPB reinforcing bar and concrete dynamic bonding slippage test additional device |
-
2019
- 2019-05-09 CN CN201920658944.6U patent/CN209945901U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057690A (en) * | 2019-05-09 | 2019-07-26 | 福州大学 | Hopkinson bar concrete material dual shear test device and its application method |
| CN113376033A (en) * | 2021-05-07 | 2021-09-10 | 沈阳工业大学 | Method for controlling high-speed impact load pure shear strain |
| CN113376033B (en) * | 2021-05-07 | 2024-01-30 | 沈阳工业大学 | Method for controlling pure shear strain of high-speed impact load |
| CN113945514A (en) * | 2021-10-21 | 2022-01-18 | 中交鹭建有限公司 | SHPB reinforcing bar and concrete dynamic bonding slippage test additional device |
| CN113945514B (en) * | 2021-10-21 | 2024-05-14 | 中交鹭建有限公司 | SHPB reinforcing bar and concrete dynamic bonding slip test additional device |
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| GR01 | Patent grant | ||
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Granted publication date: 20200114 |