CN108181164A - The sample wave velocity measurement device and its test method of a kind of impact test - Google Patents
The sample wave velocity measurement device and its test method of a kind of impact test Download PDFInfo
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- CN108181164A CN108181164A CN201810056102.3A CN201810056102A CN108181164A CN 108181164 A CN108181164 A CN 108181164A CN 201810056102 A CN201810056102 A CN 201810056102A CN 108181164 A CN108181164 A CN 108181164A
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- velocity measurement
- wave velocity
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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
-
- 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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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of sample wave velocity measurement devices of split hopkinson press bar impact test, including confining pressure platform, the confining pressure platform is equipped with hydraulic chamber, the inside of hydraulic chamber has the confining pressure position for accommodating and fixing test block, the wave velocity measurement device of a pair of of mirror image setting is additionally provided on confining pressure platform, wave velocity measurement device includes the sleeve, two ultrasonic probes that are hinged on confining pressure platform, and the ultrasonic probe of both sides wave velocity measurement device completes the experiment of sample wave velocity measurement to clipping test block.The invention also provides the test methods using said sample wave velocity measurement device, mainly include the step of confining pressure is with testing.The invention avoids testing to need the inconvenience for loading and unloading test block repeatedly in the process, time and manpower are saved, test accuracy and test efficiency is greatly improved.
Description
Technical field
The present invention relates to a kind of auxiliary devices for the structure feature and mechanical property for judging test block, refer specifically to a kind of separation
The sample wave velocity measurement device and its test method of formula Hopkinson pressure bar impact test.
Background technology
In recent years, as the continuous development of world economy construction, the buried depth of engineering rock mass are also continuously increased, wherein core is prevented
Nurse's journey such as North American Air Defense Command's buried depth have reached more than 700m, the deep geologic processing depth of nuke rubbish up to hundreds of meters or even
Upper km, mining industry energy extraction engineering as deep as three or four kms more than.
In the work progress of deep underground engineering, rock mass is often subject to the blast disturbance of construction and excavation near working face,
And underground engineering during use may also be by the various Impact Loads such as bump, earthquake, gas explosion
And generate destruction.Meanwhile deep engineering rock mass is under the environmental condition of high-ground stress, Rock Mass is under high-stress state
Ductility is converted into, and leads to be stored in the elastic energy inside rock mass again from ductility to temperature in unloading process is excavated
It is discharged under the conditions of disturbance etc., is easy to generate the brittle breaks phenomenons such as rock mass splitting, avalanche, even results in the generation of rock burst, it is right
The safety of engineering causes grave danger.In conclusion study of rocks material is by high-ground stress and impact load joint
Structure feature under effect has very important engineering significance with mechanical property.
A kind of dynamic mechanical of the split hopkinson press bar as research material under high strain-rate one-dimensional stress state
The efficiency test device of performance, is widely used in the field.In testing indoors, split hopkinson press bar simulation is commonly used
Impact load increases confining pressure platform thereon, applies confining pressure to test block to simulate high-ground stress effect, and liquidated with supersonic reflectoscope
Rock test block after the effect of hitting carries out wave velocity measurement, and then studies under high-ground stress environment work during blasting impact load action
The structure feature and mechanical property of Cheng Yanti.
Existing split hopkinson press bar experimental rig is under for high-ground stress environment, Impact Load process
Research in terms of the destruction and damage of middle rock mass structure has following apparent shortcoming：(1) it is required for before measuring velocity of wave every time
The oil pressure first discharged in confining pressure platform again disassembles test block, and sometimes because research needs that repeat impact can be carried out to same test block
And detection, this just needs to load and unload test block repeatedly, above process waste excessive unnecessary time and manpower；(2) iterative cycles
High surrouding rock stress adds uninstall process, can lead to the structure feature of rock mass can change, therefore ultrasound examination result and reality
Relatively large deviation can be generated, significantly reduces test accuracy.In conclusion existing experimental rig can not complete high-ground stress
Structure characteristics of rock mass and effective measure of mechanical property during impact test under environment, it would be highly desirable under the conditions of a kind of novel high confining pressure point
The it is proposed of sample wave velocity measurement device from formula Hopkinson pressure bar impact test.
Invention content
The present invention is in order to solve the above-mentioned deficiency of the prior art, it is proposed that a kind of split hopkinson press bar impact test
Sample wave velocity measurement device.Ultrasonic velocity is measured to judge the auxiliary device of the structure feature of test block and mechanical property, it is main
To be suitable for mechanical property test of the rock under Impact Load, be particularly suitable for multiple shock test under the conditions of high confining pressure
The wave velocity measurement of middle sample, belongs to field of civil engineering.
In order to solve the above-mentioned technical problem, the present invention uses following technical scheme：A kind of split hopkinson press bar punching
The sample wave velocity measurement device of experiment is hit, including confining pressure platform, the confining pressure platform is equipped with hydraulic chamber, and the inside of the hydraulic chamber has
There is the confining pressure position of receiving and fixed test block, the both sides of the confining pressure position further respectively have incident bar and transmission bar, it is characterised in that：Institute
The wave velocity measurement device that a pair of of mirror image setting is additionally provided on confining pressure platform is stated, the wave velocity measurement device includes being hinged on confining pressure platform
Sleeve, in sleeve and the fixed cylinder of probe that can be slided in sleeve and super in the fixed cylinder of probe
Pinger is popped one's head in, and the wave velocity measurement device of ultrasonic receiver probe another side is provided with ultrasonic receiver spy
Head, the ultrasonic probe of both sides wave velocity measurement device complete the experiment of sample wave velocity measurement to clipping test block.
Further, the end Angle Position of the sleeve is hingedly mounted on by shaft on the confining pressure platform, and sleeve is around the shaft
Ultrasonic receiver probe when rotation is flush to incident bar in sleeve faces test block.
Further, a sliding slot is offered on the barrel of the sleeve, which is blind end, and the probe is solid
Determine to set the push button there are one T shapes on the cylinder of cylinder, the push button neck matching of the push button is placed in the sliding slot.
Further, the front end of the fixed cylinder of the probe is equipped with the circle for accommodating mounting ultrasonic receiver probe
Cylinder groove, the rear portion of the cylinder grooves are the cylinder hollow space for cabling through the fixed cylinder of probe.
Further, the end of the sleeve is additionally provided with capping.
Two probe tail portions are separately fixed in the groove on two cylinder top by the present invention, and cylinder interior digs out perforation
Hole, the coaxial cable stretching for connection probe are connect with ultrasonic detecting equipment.Outside diameter of cylinder is more slightly smaller than sleeve diameter, and cylinder
Outer wall is set there are one T shape push buttons.
Sleeve is equipped with one of axial slide, by the position of T shapes push button alignment sliding slot, just can put cylinder into set
Cylinder, and cylinder can be made to be moved in sleeve by pushing and pulling push button along sliding slot.The identical sleeve of two designs is by two shafts
It is connected to confining pressure platform both sides.It when carrying out impact test, can push push button that will pop one's head in propelling sleeve, and cover capping protection
Probe, rotating shaft makes sleeve leave the path where incident bar, test block and transmission bar, so that it is guaranteed that the attachment device will not shadow
It rings to experiment and is normally carried out.
When needing to measure velocity of wave after impact, incident bar and transmission bar to the direction far from test block are pulled open, exposed
Capping is opened in two end faces of test block, and rotating shaft makes both sides probe face test block end face, then push button is pushed to stretch two probes
Go out, in the uniform daubing coupling agent in surface, continue to press on and sticked with test block surface, be allowed to fit closely with probe, you can use
Ultrasonic wave detector measures velocity of wave.
Cylinder outer wall and sleeve lining carry out rough surface processing and are surrounded by thin layer leather-like materials, ensure cylinder in sleeve
It is interior can slide under the premise of can also keep relative stability, i.e., be not parked in any position in sleeve by can stablize during thrust, no
Can arbitrarily slide causes when measuring velocity of wave to be difficult to that probe is made to fit closely test block.
Shaft is processed by special process, ensures that connecting shaft has a certain roughness, shaft after rotational sleeve to designated position
Stiction can be relied on to keep stablizing, the weight of sleeve and its internal component can be born.Capping is equipped with sleeve interface
Screw thread, capping can be screwed and not fallen out.
Invention additionally discloses the test methods of said sample wave velocity measurement device, include the following steps：
1）Test block is installed according to the code requirement of impact test, adjusts incident bar and transmission bar, increases high surrouding rock stress and carries out
Impact test, at this time wave velocity measurement device be suspended on both sides, do not interfere with being normally carried out for impact test；
2）After impact test, when needing to measure velocity of wave, incident bar is pulled open outward with transmission bar；
3）Capping is unscrewed, rotating shaft changes the direction of sleeve, until the ultrasonic receiver probe on both sides and ultrasonic wave transmitting
The end face of device probe face test block；
4）Push button is pushed to be slided along sliding slot, cylinder is made to be moved in sleeve, is received in ultrasonic transmitter probe and ultrasonic wave
Device probe is uniformly coated with couplant after stretching out, and two probes is finally made to be in close contact with test block both ends end face；
5）It opens supersonic reflectoscope and carries out wave velocity measurement；
6）After the completion of wave velocity measurement, push push button that cylinder and probe is made to be retracted to sleeve bottom, cover capping, and rotating shaft makes
Sleeve is hung vertically in confining pressure platform both sides；
7）The position that the incident bar removed and transmission bar are pushed into be bonded with test block again, you can continue cycling through and carry out high confining pressure item
Impact test under part.
Compared with prior art, provided by the present invention for split hopkinson press bar impact test under the conditions of high confining pressure
Sample wave velocity measurement device, recycle high surrouding rock stress reducing and add what uninstall process had an adverse effect to results precision
On the basis of, avoid experiment needs to load and unload the inconvenience of test block repeatedly in the process, saves time and manpower, is greatly improved
Test accuracy and test efficiency.
Description of the drawings
Schematic diagram when Fig. 1 is the experiment of the present invention；
Fig. 2 is that the probe of the present invention and cylinder take in sleeve bottom and cover the sectional view of capping；
Fig. 3 is the pre- state diagram tested after the impact test of the present invention；
Fig. 4 is the sectional view of the sleeve of the present invention；
Fig. 5 is that the promotion push button of the present invention makes the state diagram that probe stretching is bonded with test block；
Fig. 6 is the side cutaway view of the cylinder of the present invention.；
Fig. 7 is the front view of the cylinder of the present invention；
Fig. 8 is the vertical view of the cylinder of the present invention；
Fig. 9 is the front view of the sleeve of the present invention；
Figure 10 is the vertical view of the sleeve of the present invention；
Figure 11 is the side cutaway view of the sleeve of the present invention.
Specific embodiment
Invention is described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, the sample wave velocity measurement device of split hopkinson press bar impact test proposed by the present invention, it
Mainly include ultrasonic transmitter probe 1, ultrasonic receiver probe 2, the fixed cylinder 3 of probe, T shapes push button 4, sleeve 5, sliding slot
6th, shaft 7 and capping 8.
As shown in Fig. 6 to 8,3 outer wall of cylinder is equipped with T shapes push button 4, and 3 top of cylinder is equipped with groove 12 to mounting ultrasonic
Transmitter probe 1 or ultrasonic receiver probe 2, connecting the coaxial cable of probe can stretch out from hollow space 13, be connected to
Supersonic reflectoscope.
As shown in Figs. 9 to 11, sleeve 5 not by sliding slot 6 completely through that is, there are one section of connected blind ends 15 for bottom.
As shown in figure 4, the neck 14 of push button 4 is aligned sliding slot 6, the cylinder 3 for being fixed with probe can be put into sleeve 5
It is interior, and can be slided in it.
As depicted in figs. 1 and 2, when sleeve 5 in confining pressure 16 both sides of platform are hung over vertically, push button 4 can be by bottom linkage section 15
It blocks, inner cylinder 3 and probe are not fallen out.
The operating method of said sample wave velocity measurement device, is as follows：
1. the code requirement according to impact test installs test block, incident bar and transmission bar are adjusted, increases high surrouding rock stress and carries out
Impact test（Shown in Fig. 1）, at this time wave velocity measurement device be suspended on both sides, do not interfere with being normally carried out for impact test.
2. after impact test, when needing to measure velocity of wave, incident bar is pulled open outward with transmission bar.
3. unscrew the capping 8 in the wave velocity measurement device of 16 both sides of confining pressure platform shown in Fig. 1, Fig. 2.
4. rotating shaft 7 changes the direction of sleeve 5, until the end face of internal two probe faces test block 10, such as Fig. 3 institutes
Show.
5. according to Fig. 4, push button 4 is pushed to be slided along sliding slot 6, cylinder 3 is made to be moved in sleeve 5, probe is uniform after stretching out
Couplant is coated, probe is finally made to be in close contact with 10 both ends end face of test block（As shown in Figure 5）.
6. opening supersonic reflectoscope carries out wave velocity measurement；
7. after the completion of wave velocity measurement, pushing push button 4 that cylinder 3 and probe is made to be retracted to 5 bottom of sleeve, capping 8 is covered, and rotate and turn
Axis 7 makes sleeve 5 be hung vertically in 16 both sides of confining pressure platform；
8. the incident bar 9 removed and transmission bar 11 are pushed into the position being bonded with test block 10 again, as shown in Figure 1, you can continue
Carry out the impact test under the conditions of high confining pressure.
Above-described embodiment only expresses the several embodiments of the present invention, and description is more specific and detailed, but can not
Therefore understands that for the limitation to the scope of the claims of the present invention.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, these belong to protection scope of the present invention.
Therefore, patent of the present invention and protection domain should be subject to the appended claims.
Claims (6)
1. a kind of sample wave velocity measurement device of split hopkinson press bar impact test, including confining pressure platform（16）, it is described to enclose
It presents a theatrical performance as the last item on a programme equipped with hydraulic chamber（17）, the hydraulic chamber（17）Inside have and accommodate and fixed test block（10）Confining pressure position, this is enclosed
The both sides of pressure position further respectively have incident bar（9）And transmission bar（11）, it is characterised in that：The confining pressure platform（16）On be additionally provided with one
To the wave velocity measurement device of mirror image setting, the wave velocity measurement device includes being hinged on confining pressure platform（16）On sleeve（5）, installation
In sleeve and the probe that can be slided in sleeve fixes cylinder（3）With the ultrasonic wave transmitting in the fixed cylinder of probe
Device is popped one's head in（1）, pop one's head in corresponding to ultrasonic receiver（1）The wave velocity measurement device of another side is provided with ultrasonic receiver probe
（2）, the ultrasonic probe of both sides wave velocity measurement device is to clipping test block（10）Complete the experiment of sample wave velocity measurement.
2. the sample wave velocity measurement device of split hopkinson press bar impact test as described in claim 1, feature exist
In：The sleeve（5）End Angle Position pass through shaft（7）It is hingedly mounted on the confining pressure platform（16）On, sleeve（5）Rotate shaft rotation
It is dynamic to be flush to sleeve during incident bar（5）Interior ultrasonic receiver probe faces test block.
3. the sample wave velocity measurement device of split hopkinson press bar impact test as described in claim 1, feature exist
In：The sleeve（5）Barrel on offer a sliding slot（6）, which is blind end（15）, the fixed circle of probe
The push button there are one T shapes is set on the cylinder of cylinder（4）, the push button（4）Push button neck（14）Matching is placed in the sliding slot.
4. the sample wave velocity measurement device of split hopkinson press bar impact test as described in claim 1, feature exist
In：The fixed cylinder of probe（3）Front end be equipped with for accommodate mounting ultrasonic receiver probe cylinder grooves（12）,
The cylinder grooves（12）Rear portion be the cylinder hollow space for cabling through the fixed cylinder of probe（13）.
5. the sample wave velocity measurement device of split hopkinson press bar impact test as described in claim 1, feature exist
In：The sleeve（5）End be additionally provided with capping（8）.
6. a kind of test method of sample wave velocity measurement device using claim 1 to 5, includes the following steps：
1）Test block is installed according to the code requirement of impact test, adjusts incident bar and transmission bar, increases high surrouding rock stress and carries out
Impact test, at this time wave velocity measurement device be suspended on both sides, do not interfere with being normally carried out for impact test；
2）After impact test, when needing to measure velocity of wave, incident bar is pulled open outward with transmission bar；
3）Capping is unscrewed, rotating shaft changes the direction of sleeve, until the ultrasonic receiver probe on both sides and ultrasonic wave transmitting
The end face of device probe face test block；
4）Push button is pushed to be slided along sliding slot, cylinder is made to be moved in sleeve, is received in ultrasonic transmitter probe and ultrasonic wave
Device probe is uniformly coated with couplant after stretching out, and two probes is finally made to be in close contact with test block both ends end face；
5）It opens supersonic reflectoscope and carries out wave velocity measurement；
6）After the completion of wave velocity measurement, push push button that cylinder and probe is made to be retracted to sleeve bottom, cover capping, and rotating shaft makes
Sleeve is hung vertically in confining pressure platform both sides；
7）The position that the incident bar removed and transmission bar are pushed into be bonded with test block again, you can continue cycling through and carry out high confining pressure item
Impact test under part.
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 |
Applications Claiming Priority (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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| CN108181164A true CN108181164A (en) | 2018-06-19 |
| CN108181164B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114755096A (en) * | 2022-05-11 | 2022-07-15 | 天津大学 | Dynamic punching shear experimental device and experimental method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114755096A (en) * | 2022-05-11 | 2022-07-15 | 天津大学 | Dynamic punching shear experimental device and experimental method |
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| Publication number | Publication date |
|---|---|
| CN108181164B (en) | 2020-05-12 |
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