CN108181164B - Sample wave velocity measuring device for impact test and test method thereof - Google Patents
Sample wave velocity measuring device for impact test and test method thereof Download PDFInfo
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- CN108181164B CN108181164B CN201810056102.3A CN201810056102A CN108181164B CN 108181164 B CN108181164 B CN 108181164B CN 201810056102 A CN201810056102 A CN 201810056102A CN 108181164 B CN108181164 B CN 108181164B
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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
- 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
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- 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
- G01N2203/0048—Hydraulic means
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- 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
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a sample wave velocity measuring device for a split Hopkinson pressure bar impact test, which comprises a confining pressure table, wherein an oil pressure chamber is arranged on the confining pressure table, a confining pressure position for accommodating and fixing a test block is arranged in the oil pressure chamber, a pair of wave velocity measuring devices arranged in a mirror image mode are further arranged on the confining pressure table, each wave velocity measuring device comprises a sleeve and two ultrasonic probes, the sleeves are hinged to the confining pressure table, the ultrasonic probes of the wave velocity measuring devices on the two sides face the test block, and the sample wave velocity measuring test is completed. The invention also provides a test method using the sample wave velocity measuring device, which mainly comprises the steps of confining pressure and testing. The invention avoids the inconvenience of repeatedly assembling and disassembling the test block in the test process, saves time and labor and greatly improves the test precision and test efficiency.
Description
Technical Field
The invention relates to an auxiliary device for judging structural characteristics and mechanical properties of a test block, in particular to a sample wave velocity measuring device for a split Hopkinson pressure bar impact test and a test method thereof.
Background
In recent years, with the continuous development of world economic construction, the burial depth of engineering rock mass is continuously increased, wherein the burial depth of core protection engineering such as North America air defense commander reaches more than 700m, the deep geological treatment depth of nuclear waste reaches hundreds of meters or thousands of meters, and the mining energy exploitation engineering reaches more than three or four kilometers.
During the construction of deep underground works, the rock mass near the working face is often disturbed by the blasting of the construction excavation, and the underground works can also be damaged by various impact loads such as rock burst, earthquake, gas explosion and the like during use. Meanwhile, the surrounding rock mass of the deep engineering rock mass is converted into ductility under a high-stress state under the environment condition of high ground stress, and the ductility is converted into brittleness in the excavation unloading process, so that elastic energy stored in the rock mass is released under the conditions of disturbance and the like, brittle failure phenomena such as rock mass splitting, collapse and the like are easily generated, even rock burst is caused, and great threat is caused to the safety of the engineering. In conclusion, the research on the structural characteristics and the mechanical properties of the rock material under the combined action of high ground stress and impact load has very important engineering significance.
The split Hopkinson pressure bar is widely used in the field as an effective test device for researching the dynamic mechanical property of a material in a high-strain-rate one-dimensional stress state. In an indoor test, a common separated Hopkinson pressure bar simulates an impact load, a confining pressure table is additionally arranged on the pressure table, confining pressure is applied to a test block to simulate the action of high ground stress, an ultrasonic detector is used for measuring the wave velocity of the rock test block after the impact action, and the structural characteristics and the mechanical property of an engineering rock mass in the process of blasting impact load action in the high ground stress environment are further researched.
The existing separated Hopkinson pressure bar test device has the following obvious defects in the aspect of research on the damage and damage of a rock mass structure in the impact load action process under the high ground stress environment: (1) before the wave velocity is measured each time, the oil pressure in the confining pressure table needs to be released firstly, then the test block needs to be disassembled, and sometimes the same test block needs to be impacted and detected for many times due to research, so that the test block needs to be repeatedly assembled and disassembled, and the process wastes excessive unnecessary time and labor; (2) the repeated and cyclic high surrounding rock stress loading and unloading process can cause the structural characteristics of the rock body to change, so that the ultrasonic detection result can generate larger deviation with the actual condition, and the test precision is greatly reduced. In summary, the existing test apparatus cannot effectively determine structural characteristics and mechanical properties of a rock mass in an impact test process in a high ground stress environment, and a new sample wave velocity determination apparatus for a split hopkinson pressure bar impact test under a high confining pressure condition is urgently needed to be proposed.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a sample wave velocity measuring device for a split Hopkinson pressure bar impact test. The auxiliary device for determining the structural characteristics and the mechanical property of the test block by measuring the ultrasonic wave speed is mainly suitable for mechanical property tests of rocks under the action of impact load, is particularly suitable for measuring the wave speed of a sample in multiple impact tests under the condition of high confining pressure, and belongs to the field of civil engineering.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a disconnect-type hopkinson pressure bar impact test's sample wave velocity survey device, includes and encloses the pressure platform, be equipped with the oil pressure room on enclosing the pressure platform, the inside of oil pressure room has the confined pressure position of acceping and fixed test block, and the both sides of this confined pressure position still are equipped with incident pole and transmission pole, its characterized in that respectively: the device comprises a sleeve hinged on the confining pressure table, a probe fixing cylinder arranged in the sleeve and capable of sliding in the sleeve, and an ultrasonic transmitter probe arranged in the probe fixing cylinder, wherein the ultrasonic transmitter probe is arranged on the other side of the ultrasonic receiver probe, and the ultrasonic probes of the two sides of the wave velocity measuring devices clamp test blocks to complete a test for measuring the wave velocity of the sample.
Furthermore, the end angle position of the sleeve is hinged to the confining pressure table through a rotating shaft, and when the sleeve rotates around the rotating shaft to be flush with the incident rod, the ultrasonic receiver probe in the sleeve faces the test block.
Furthermore, a sliding groove is formed in the wall of the sleeve, the bottom of the sliding groove is a closed end, a T-shaped push button is arranged on the probe fixing cylinder, and the neck of the push button is arranged in the sliding groove in a matched mode.
Furthermore, a cylinder groove for accommodating and fixing the ultrasonic receiver probe is arranged at the front end of the probe fixing cylinder, and a cylinder hollow part which penetrates through the probe fixing cylinder and is used for wiring is arranged at the rear part of the cylinder groove.
Further, the end part of the sleeve is also provided with a sealing cover.
The tail parts of the two probes are respectively fixed in the grooves at the upper parts of the two cylinders, and the through holes are drawn out from the cylinders for the coaxial cables connected with the probes to extend out to be connected with ultrasonic detection equipment. The outer diameter of the cylinder is slightly smaller than the inner diameter of the sleeve, and a T-shaped push button is arranged on the outer wall of the cylinder.
The sleeve is provided with an axial sliding groove, the T-shaped push button is aligned to the sliding groove, the cylinder can be just placed into the sleeve, and the push button can be pushed and pulled along the sliding groove, so that the cylinder moves in the sleeve. Two sleeves with the same design are respectively connected to two sides of the confining pressure platform through two rotating shafts. When the impact test is carried out, the push button can be pushed to push the probe into the sleeve, the sealing cover is well covered to protect the probe, and the rotating shaft is rotated to enable the sleeve to leave a path where the incident rod, the test block and the transmission rod are located, so that the additional device is ensured not to influence the normal operation of the test.
When the wave velocity needs to be measured after impact, the incident rod and the transmission rod are pulled apart in the direction away from the test block to expose two end faces of the test block, the sealing cover is opened, the rotating shaft is rotated to enable the probes on two sides to be opposite to the end faces of the test block, the push button is pushed to enable the two probes to extend out, the couplant is evenly smeared on the surface of the test block, the test block is continuously pushed to be attached to the surface of the test block to be tightly attached to the probes, and then the ultrasonic detector can be used for measuring the wave velocity.
The surface roughness is carried out to drum outer wall and sleeve inner wall and the package has thin layer leather class material, guarantees that the drum also can keep relatively stable under the gliding prerequisite in the sleeve, can stably stop in the sleeve optional position when not receiving thrust promptly, can not slide at will and be difficult to make the probe closely laminate the test block when leading to survey the wave speed.
The rotating shaft is processed by a special process, so that the connecting shaft has certain roughness, and the rotating shaft can be kept stable by virtue of static friction force after the sleeve is rotated to a specified position and can bear the weight of the sleeve and internal components thereof. The joint of the sealing cover and the sleeve is provided with threads, and the sealing cover can be screwed down and cannot fall off.
The invention also discloses a test method of the sample wave velocity measuring device, which comprises the following steps:
1) installing a test block according to the standard requirement of an impact test, adjusting an incident rod and a transmission rod, increasing the stress of high surrounding rock to carry out the impact test, and hanging wave velocity measuring devices on two sides at the moment so as not to influence the normal operation of the impact test;
2) after the impact test is finished, when the wave velocity needs to be measured, the incident rod and the transmission rod are pulled outwards;
3) unscrewing the sealing cover, and rotating the rotating shaft to change the direction of the sleeve until the ultrasonic receiver probes and the ultrasonic transmitter probes on the two sides are opposite to the end face of the test block;
4) pushing the push button to slide along the sliding groove, so that the cylinder moves in the sleeve, uniformly coating the coupling agent after the ultrasonic transmitter probe and the ultrasonic receiver probe extend out, and finally enabling the two probes to be in close contact with the end faces of the two ends of the test block;
5) turning on an ultrasonic detector to measure the wave speed;
6) after the wave velocity measurement is finished, pushing the push button to enable the cylinder and the probe to be retracted to the bottom of the sleeve, covering the sealing cover, and rotating the rotating shaft to enable the sleeve to be vertically hung on two sides of the confining pressure platform;
7) and pushing the removed incident rod and the transmission rod to the position attached to the test block again, and then continuously and circularly carrying out the impact test under the high ambient pressure condition.
Compared with the prior art, the sample wave velocity measuring device for the split Hopkinson pressure bar impact test under the high confining pressure condition provided by the invention avoids the inconvenience of repeatedly assembling and disassembling the test block in the test process on the basis of reducing the adverse effect of the stress loading and unloading process of the circulating high confining rock on the test precision, saves time and labor, and greatly improves the test precision and the test efficiency.
Drawings
FIG. 1 is a schematic illustration of the present invention during testing;
FIG. 2 is a cross-sectional view of the probe and cylinder of the present invention received into the bottom of the sleeve and capped with a cap;
FIG. 3 is a diagram of a pre-test state after the impact test of the present invention is completed;
FIG. 4 is a cross-sectional view of a sleeve of the present invention;
FIG. 5 is a diagram illustrating a state in which the push button is pushed to extend the probe to fit the test block;
fig. 6 is a side sectional view of the cylinder of the present invention. (ii) a
FIG. 7 is a front view of the cylinder of the present invention;
FIG. 8 is a top view of the cylinder of the present invention;
FIG. 9 is a front view of the sleeve of the present invention;
FIG. 10 is a top view of the sleeve of the present invention;
FIG. 11 is a side cross-sectional view of a sleeve of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1, the device for measuring the wave velocity of a sample for a split hopkinson pressure bar impact test, which is provided by the invention, mainly comprises an ultrasonic transmitter probe 1, an ultrasonic receiver probe 2, a probe fixing cylinder 3, a T-shaped push button 4, a sleeve 5, a chute 6, a rotating shaft 7 and a sealing cover 8.
As shown in FIGS. 6 to 8, the outer wall of the cylinder 3 is provided with a T-shaped push button 4, the upper part of the cylinder 3 is provided with a groove 12 for fixing the ultrasonic transmitter probe 1 or the ultrasonic receiver probe 2, and a coaxial cable connected with the probe can extend from the hollow part 13 to be connected to the ultrasonic detector.
As shown in fig. 9 to 11, the sleeve 5 is not completely penetrated by the chute 6, i.e. the bottom part is left with an associated closed end 15.
As shown in fig. 4, the cylinder 3 with the probe fixed thereto can be placed in the sleeve 5 and slid therein by aligning the neck 14 of the push button 4 with the slide groove 6.
As shown in fig. 1 and 2, when the sleeve 5 is vertically hung on both sides of the confining pressure table 16, the push button 4 will be blocked by the bottom connecting section 15, and the inner cylinder 3 and the probe will not fall off.
The operation method of the sample wave velocity measuring device comprises the following specific steps:
1. the test block is installed according to the standard requirement of the impact test, the incident rod and the transmission rod are adjusted, the stress of the high surrounding rock is increased to carry out the impact test (shown in figure 1), and at the moment, the wave velocity measuring device is hung on two sides, so that the normal operation of the impact test is not influenced.
2. After the impact test is finished, when the wave velocity needs to be measured, the incident rod and the transmission rod are pulled outwards.
3. The caps 8 of the wave velocity measuring apparatus on both sides of the confining pressure table 16 shown in fig. 1 and 2 are unscrewed.
4. The rotating shaft 7 is rotated to change the direction of the sleeve 5 until the two probes in the inner part are opposite to the end surface of the test block 10, as shown in fig. 3.
5. According to fig. 4, the push button 4 is pushed to slide along the sliding groove 6, so that the cylinder 3 moves in the sleeve 5, the coupling agent is uniformly coated after the probe extends out, and finally the probe is tightly contacted with the end faces of the two ends of the test block 10 (as shown in fig. 5).
6. Turning on an ultrasonic detector to measure the wave speed;
7. after the wave velocity measurement is finished, pushing the push button 4 to enable the cylinder 3 and the probe to be retracted to the bottom of the sleeve 5, covering the sealing cover 8, and rotating the rotating shaft 7 to enable the sleeve 5 to be vertically hung on two sides of the confining pressure table 16;
8. the impact test under high ambient pressure can be continued by pushing the removed incident rod 9 and transmission rod 11 back to the position where they are attached to the test block 10, as shown in fig. 1.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the patent and protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. The utility model provides a disconnect-type hopkinson pressure bar impact test's sample wave velocity survey device, includes and encloses pressure platform (16), enclose and press bench to be equipped with oil pressure chamber (17), the inside of oil pressure chamber (17) has the confined pressure position of acceping and fixed test block (10), and the both sides of this confined pressure position still are equipped with incident pole (9) and transmission pole (11) respectively, its characterized in that: enclose and press still to be equipped with the wave velocity survey device that a pair of mirror image set up on platform (16), wave velocity survey device is including articulating sleeve (5) on enclosing and pressing platform (16), install in the sleeve and can be in fixed drum of the gliding probe (3) of sleeve and install ultrasonic transmitter probe (1) in the fixed drum of probe, and the wave velocity survey device that corresponds to ultrasonic receiver probe (1) another side is provided with ultrasonic receiver probe (2), and the ultrasonic probe of both sides wave velocity survey device is facing to pressing from both sides test block (10) and is accomplished sample wave velocity survey test.
2. The apparatus for measuring the wave velocity of a sample for a split hopkinson pressure bar impact test according to claim 1, wherein: the end angle position of the sleeve (5) is hinged and installed on the confining pressure table (16) through a rotating shaft (7), and when the sleeve (5) rotates around the rotating shaft to be flush with the incident rod, the ultrasonic receiver probe in the sleeve (5) faces the test block.
3. The apparatus for measuring the wave velocity of a sample for a split hopkinson pressure bar impact test according to claim 2, wherein: the probe fixing device is characterized in that a sliding groove (6) is formed in the wall of the sleeve (5), the bottom of the sliding groove is a closed end (15), a T-shaped push button (4) is arranged on the probe fixing cylinder, and a neck (14) of the push button (4) is arranged in the sliding groove in a matching mode.
4. The apparatus for measuring the wave velocity of a sample for a split hopkinson pressure bar impact test according to claim 3, wherein: the front end part of the probe fixing cylinder (3) is provided with a cylinder groove (12) for accommodating and fixing the ultrasonic receiver probe, and the rear part of the cylinder groove (12) is a cylinder hollow part (13) which penetrates through the probe fixing cylinder and is used for wiring.
5. The apparatus for measuring the wave velocity of a sample for a split hopkinson pressure bar impact test according to claim 4, wherein: the end part of the sleeve (5) is also provided with a sealing cover (8).
6. A test method using the sample wave velocity measuring apparatus according to claim 5, comprising the steps of:
1) installing a test block according to the standard requirement of an impact test, adjusting an incident rod and a transmission rod, increasing the stress of high surrounding rock to carry out the impact test, and hanging wave velocity measuring devices on two sides at the moment so as not to influence the normal operation of the impact test;
2) after the impact test is finished, when the wave velocity needs to be measured, the incident rod and the transmission rod are pulled outwards;
3) unscrewing the sealing cover, and rotating the rotating shaft to change the direction of the sleeve until the ultrasonic receiver probes and the ultrasonic transmitter probes on the two sides are opposite to the end face of the test block;
4) pushing the push button to slide along the sliding groove, so that the cylinder moves in the sleeve, uniformly coating the coupling agent after the ultrasonic transmitter probe and the ultrasonic receiver probe extend out, and finally enabling the two probes to be in close contact with the end faces of the two ends of the test block;
5) turning on an ultrasonic detector to measure the wave speed;
6) after the wave velocity measurement is finished, pushing the push button to enable the cylinder and the probe to be retracted to the bottom of the sleeve, covering the sealing cover, and rotating the rotating shaft to enable the sleeve to be vertically hung on two sides of the confining pressure platform;
7) and pushing the removed incident rod and the transmission rod to the position attached to the test block again, and then continuously and circularly carrying out the impact test under the high ambient pressure condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810056102.3A CN108181164B (en) | 2018-01-30 | 2018-01-30 | Sample wave velocity measuring device for impact test and test method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810056102.3A CN108181164B (en) | 2018-01-30 | 2018-01-30 | Sample wave velocity measuring device for impact test and test method thereof |
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| CN108181164A CN108181164A (en) | 2018-06-19 |
| CN108181164B true CN108181164B (en) | 2020-05-12 |
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| CN201810056102.3A Expired - Fee Related CN108181164B (en) | 2018-01-30 | 2018-01-30 | Sample wave velocity measuring device for impact test and test method thereof |
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| CN111751228A (en) * | 2020-06-18 | 2020-10-09 | 哈尔滨工程大学 | Column boundary multi-angle electric spark bubble wall pressure load experimental device |
| CN114755096B (en) * | 2022-05-11 | 2022-11-22 | 天津大学 | Dynamic punching shear experimental device and experimental method |
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| JPS6184554A (en) * | 1984-10-02 | 1986-04-30 | Mitsubishi Heavy Ind Ltd | Underwater abrasion inspecting device |
| JP5197632B2 (en) * | 2007-02-21 | 2013-05-15 | ロッキード マーティン コーポレイション | Ultrasonic nondestructive evaluation system and ultrasonic nondestructive evaluation method using the same |
| CN202182874U (en) * | 2011-08-22 | 2012-04-04 | 南通友联数码技术开发有限公司 | Combined scanning frame adopting ultrasound diffraction time difference method |
| CN203117170U (en) * | 2013-02-07 | 2013-08-07 | 倪渊 | Multi-freedom-degree ultrasonic probe holder |
| US9334066B2 (en) * | 2013-04-12 | 2016-05-10 | The Boeing Company | Apparatus for automated rastering of an end effector over an airfoil-shaped body |
| CN203148798U (en) * | 2013-04-15 | 2013-08-21 | 北京理工大学 | Micro dynamic tension/compression test system with preloading function |
| CN206146611U (en) * | 2016-09-19 | 2017-05-03 | 杭州戬威机电科技有限公司 | Wind -powered electricity generation blade ultrasonic non -destructive testing device |
| CN106950113B (en) * | 2017-03-29 | 2019-09-17 | 中国石油大学(华东) | A kind of device and its application for horizontal well explosion fracturing simulated experiment |
| CN107144635B (en) * | 2017-05-05 | 2019-11-12 | 宁波城市职业技术学院 | A kind of detection method of wood materials ultrasonic non-destructive classified detection system |
| CN107167523B (en) * | 2017-05-31 | 2019-10-01 | 王燕 | A kind of crack automatic flaw detection device of bridge concrete guardrail |
| CN107340229A (en) * | 2017-06-22 | 2017-11-10 | 中国矿业大学 | A kind of experimental provision and method for testing coal and rock dynamics |
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