CN210803117U - Uniaxial compression experimental device - Google Patents
Uniaxial compression experimental device Download PDFInfo
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- CN210803117U CN210803117U CN201921324592.7U CN201921324592U CN210803117U CN 210803117 U CN210803117 U CN 210803117U CN 201921324592 U CN201921324592 U CN 201921324592U CN 210803117 U CN210803117 U CN 210803117U
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Abstract
The utility model relates to a rock unipolar compression experiment auxiliary device field discloses a unipolar compression experimental apparatus, and it includes top cap, device pressure head and the device base that arranges in proper order according to the direction of pressurization, top cap and device pressure head fixed connection, the top cap is used for being connected with the testing machine pressure head, and the appearance of device pressure head is coaxial hollow cylinder and the combination of the solid of rotation of monotonic reducing, and it has the wire casing to open on the hollow cylinder's lateral wall, and the appearance of device base is coaxial solid of rotation of monotonic reducing and hollow cylinder's combination, also has opened the wire casing on the hollow cylinder's of device base lateral wall, the less terminal surface of the solid diameter of two monotonic reducing do the working face, the hollow cylinder inboard setting of device base is used for the device base limit structure who is connected with the. The device can complete measurement under the condition that the probe is not loaded with pressure, can analyze the axial and transverse wave velocity changes of the test piece under different stress levels in real time, and improves the reliability of test results.
Description
Technical Field
The utility model belongs to the technical field of rock test's unipolar compression experimental apparatus and specifically relates to an experimental apparatus that can be used for ultrasonic damage to detect.
Background
Rock, as a natural material, always contains different degrees of initial defects, such as microcracks, voids, etc., inside it no matter how dense it is. When the rock begins to bear the external force, the internal micro defects are compacted and closed, the structure is more compact, and the corresponding medium wave velocity rises, which can explain why the phenomenon that the rock sample wave velocity is less than the in-situ rock mass wave velocity occurs in some engineering rock masses; along with the gradual rise of the external force, the wave velocity of the medium rises to reach a peak value, the microcracks in the rock begin to germinate and expand, at a certain moment, the microcracks penetrate and form macrocracks and finally cause the destabilization damage of the rock, the change of the wave velocity is reflected in that the wave velocity is accelerated and reduced along with the gradual expansion of the cracks, and therefore, the damage state in the rock is closely related to the wave velocity of the medium in the rock. Therefore, rock ultrasonic detection tests under different loads and stress levels are developed, and the damage accumulation process of rock materials is evaluated and described through the changes of wave velocity and wave shape, so that the method has important significance for engineering stability control and safety prediction.
Because the ultrasonic sensor does not have the pressure-bearing capacity, the traditional rock ultrasonic detection test is mainly aimed at the nondestructive detection of rocks in a natural state, namely, the probe is in direct contact with the rocks and no additional load is arranged at the two ends of the probe. Even if the wave velocity change characteristics of the interior of the rock under different stress conditions are researched, the ultrasonic probe is mostly arranged on the side surface of the rock sample, and the axial wave velocity change cannot be directly discussed.
A uniaxial compression test device is disclosed in a paper of an article, namely experimental research on sandstone wave velocity under axial pressure, of Yangmafeng and the like, which is published in the Geomethrical development 19, No. 2 of No. 6 in 2004, and comprises a pair of transducer protection rings designed according to the size of a transducer, and a steel cushion block is additionally arranged between the transducer and a test piece to serve as a substitute pressure bearing device of the transducer, so that the aim of directly measuring the axial wave velocity is fulfilled.
The main part bearing portion that this scheme adopted is the transducer protection ring, and this ring is really a steel ring, in order to make stress distribution more even be provided with the steel cushion between steel ring and the experimental sample, according to mechanics of materials force analysis, this scheme load mainly concentrates on the outer circumference part of test piece, and the more obvious the lack of stress toward the test piece center, it is obvious that this device does not carefully consider the transmission efficiency of rock stress in-process to lead to the destruction form of test piece and normal unipolar compression condition inconsistent and this device can't measure the transverse wave speed of rock specimen. Therefore, the development of a device which does not influence stress transmission and can replace a transducer for bearing pressure can meet the requirements of analyzing axial and transverse wave velocity changes under different stress levels in real time and further discussing the coupling relation between the internal damage rule and the wave velocity change of the device along with the stress change, and the device becomes a key problem and urgent need for developing relevant experimental research.
Disclosure of Invention
Based on the deep analysis to the structure of above-mentioned device and experimental requirement, the utility model aims to solve the technical problem that a do not influence stress transmission efficiency basically and can cooperate the unipolar compression experimental apparatus of transducer direct measurement rock each direction wave speed is provided, the utility model aims at mainly realizing through the structural style of optimizing the device with the help of the mode that analog computation and experiment were verified to guarantee stress conduction efficiency, improve the reliability of test result.
The utility model provides a technical scheme that its technical problem adopted is: uniaxial compression experimental device, including top cap, device pressure head and the device base of arranging according to the direction of pressurization order, top cap and device pressure head fixed connection, the working face of device pressure head and device base is relative, is test piece installation position between two working faces, the top cap is used for being connected with the testing machine pressure head, and the appearance of device pressure head is the combination of coaxial hollow cylinder and the solid of revolution of monotonic reducing, and it has the wire casing to open on the hollow cylinder lateral wall, and the appearance of device base is coaxial solid of revolution of monotonic reducing and hollow cylinder's combination, also has opened the wire casing on the hollow cylinder lateral wall of device base, and the less terminal surface of the diameter of the solid of monotonic reducing does the working face, the hollow cylinder inboard setting of device base be used for the device base.
In the components of the device, the concentricity of the device pressure head and the device base is ensured by the limit structure of the top cover and the device base, and the device is arranged on the testing machine by the aid of the two components; the solid part of device pressure head and device base, from the shape, is coaxial solid of revolution of monotonic reducing and hollow cylinder's combination, the structure of formula as an organic whole, this part is used for the conduction of pressure, follows the utility model discloses later on the analysis can see, such shape can fit the transmission effect of power under the ordinary unipolar compression condition basically to for realizing the utility model discloses the purpose plays the key role. Compared with the existing test device, the test device is simple in assembly process, the non-bearing surface of the test piece is exposed, the axial and transverse wave velocities of the test piece can be measured simultaneously, other strain gauges can be installed, collection of various parameters in a single-shaft compression experiment is facilitated, and the force conduction efficiency and the test piece direct installation without the test device keep good consistency.
From the simulation calculation of the inventor, the optimal shape of the monotone reducing solid revolving body is a spherical segment, and in order to compromise the fitting effect and the processing convenience, the monotone reducing solid revolving body of the press head of the device and the monotone reducing solid revolving body of the base of the device are round tables. Consistent with the foregoing description: the two round tables both use the bottom surface with smaller diameter as the working surface.
In terms of the shapes of the device pressing head and the device base under the condition, the bottom surfaces with larger diameters of the two round tables can be superposed with the bottom surface of the round hole in the hollow cylinder to reduce the weight of the device pressing head and the device base, and can also have a certain distance with the bottom surface of the round hole in the hollow cylinder, namely, a part of solid cylinder is arranged between the bottom surface of the round hole of the hollow cylinder and the round tables, which is slightly beneficial to the force transmission efficiency, but can increase the weight of the device pressing head and the device base.
For being used for this device more accurate carrying out ultrasonic damage under the unipolar compression condition and detecting, in order to guarantee that the sound wave propagates along the axis, the bottom surface of the round hole of pressure head and the processing roughness of its working face all are less than or equal to 0.01mm, the bottom surface of the round hole of base and the processing roughness of its working face all are less than or equal to 0.01 mm.
In order to conveniently assemble and disassemble the axial probe, a positioning plate is arranged on the inner side of a hollow cylinder of the base and is used as a limiting structure of the base of the device, and the positioning plate is a circular plate for being matched with the hollow cylinder part, so that the concentricity is ensured while the assembly is convenient, and the positioning plate and the base are in clearance fit; and a positioning pin hole is formed in one surface of the center of the positioning plate, the positioning pin hole can be connected with the base of the testing machine in a positioning mode through a matched positioning pin, and a spring is arranged on the other surface of the positioning plate, so that the lower axial probe can be reliably fixed between the bottom surface of the round hole of the base of the device and the positioning plate through the spring force.
In order to facilitate the fixing and positioning of the transverse probe, a transverse probe mounting structure is arranged on the outer side of a hollow cylinder of a base of the device, the transverse probe mounting structure comprises a support plate provided with a central hole, the central hole of the support plate is in clearance fit with the excircle of the base, four upright columns which are in cross symmetrical distribution are arranged around the central hole, each upright column is connected with a support plate which is parallel to the support plate and has the same height with the support plate, the support plates are used for connecting the transverse probe, a pair of transverse probes can be mounted on the support plates of any two opposite upright columns, and the structure can basically ensure the centering precision.
For conveniently installing and removing the probe and adjusting the position of the probe according to the size of the test piece, the supporting plate is fixedly connected with the screw, the screw is in sliding connection with the mounting hole at the upper end of the upright post and is limited through the nut, the probe mounting hole is formed in the supporting plate, when one end of the probe is abutted against the test piece, the other end of the probe is limited by the nut, and the radial fixation of the probe is realized.
Considering the existing structure of most testing machine pressure heads, the top cover is designed to be connected with the testing machine pressure head through a central threaded hole and a matched bolt.
In addition, also need fixed connection between top cap and the device pressure head, the top cap is connected with the device pressure head through three screws that are triangular distribution, is provided with corresponding screw hole on the device pressure head, makes things convenient for location installation and dismantles test device.
The utility model has the advantages that: design dedicated device pressure head and device base and be used for installing axial ultrasonic transducer, can be under the condition that the probe is not loaded to the pressure, direct measurement axial wave speed, the accurate heart that can guarantee axial probe simultaneously of this structure also can measure horizontal wave speed, because of the transmission efficiency of stress in-process stress is secure, uses the utility model discloses an experimental apparatus can the normal unipolar compression condition of basic fitting, thereby uses the utility model discloses a destruction form of test piece under the normal unipolar compression condition can be seen to the destruction form of test piece during experimental apparatus, also can real-time analysis test piece axial and horizontal wave speed change under different stress levels, has improved the reliability of test result.
Drawings
Fig. 1 is an assembly diagram of the experimental apparatus of the present invention.
Fig. 2 is a schematic view of the cap of fig. 1.
Figure 3 is a schematic view of the indenter of the device of figure 1.
Fig. 4 is a schematic view of the base of the device of fig. 1.
Fig. 5 is a schematic view of the positioning plate of fig. 1.
FIG. 6 is a schematic view of a support plate in the lateral probe mounting arrangement of FIG. 1.
FIG. 7 is a schematic view of a pallet in the transverse probe mounting arrangement of FIG. 1.
Fig. 8 to 10 are schematic diagrams showing stress-strain curve comparison of the experiment device for performing uniaxial compression experiments on three kinds of test pieces respectively.
Labeled as: 1-top cover, 2-device pressure head, 3-device base, 4-positioning plate, 5-transverse probe mounting structure, 6-round hole, 7-wire groove, 8-pin hole, 9-center hole, 10-stud, 11-probe, 12-support plate, 13-upright post, 14-support plate, 15-screw rod, 16-nut, 17-probe mounting hole and 18-test piece.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Example (b):
as shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, the utility model discloses a unipolar compression experimental apparatus for ultrasonic damage detects, it includes top cap 1, device pressure head 2, device base 3, locating plate 4, horizontal probe mounting structure 5.
As shown in fig. 2, the top cover 1 is a hollow flange, a center threaded hole is formed in the center of the circle, the top cover can be connected with a pressure head of a testing machine through a matched stud 10, three through holes are uniformly distributed in the disk surface, a counter bore is arranged at one end of each through hole and used as a screw through hole connected with the pressure head 2 of the testing machine, two blind holes (not shown in the figure) can be symmetrically distributed in the side surface of the flange, and the flange is matched with the pressure head of the testing machine in a loading and unloading mode by inserting an operating lever into the blind holes.
As shown in fig. 3, the shape of the pressing head 2 of the device is a combination of a hollow cylinder with uniform wall thickness and a circular truncated cone, the bottom surface of a circular hole 6 in the hollow cylinder is overlapped with the end surface with larger diameter of the circular truncated cone, the end surface of the hollow cylinder is called an upper end surface, the end surface with smaller diameter of the circular truncated cone is called a lower end surface and is a working surface, and the circular hole 6 in the hollow cylinder is mainly used for placing an axial ultrasonic probe; a groove is arranged on the wall of the hollow cylinder to be used as a wire slot 7 for accommodating a feed line of the transducer to pass through; three screw holes of evenly distributed on the up end of device pressure head 2 correspond with three through-hole on the top cap 1, can be connected device pressure head 2 with top cap 1 through the screw. In order to ensure that the sound wave propagates along the axis, the processing flatness of the bottom surface of the round hole 6 and the lower end surface of the device pressure head 2 are controlled within 0.01 mm.
As shown in fig. 4, the shape of the device base 3 is similar to that of the device pressure head 2, and is a combination of a circular truncated cone and a hollow cylinder with uniform wall thickness, the end face with larger diameter of the circular truncated cone coincides with the bottom face of the circular hole 6 in the hollow cylinder, the end face with smaller diameter of the circular truncated cone end is called an upper end face and is a working face, the end face of the hollow cylinder end is called a lower end face, the circular hole 6 in the hollow cylinder is also used for placing an axial ultrasonic probe, and meanwhile, a groove is formed in the wall of the hollow cylinder and serves as a wire slot 7 for accommodating a transducer feeder to pass through. In order to ensure that the sound wave propagates along the axis, the processing flatness of the bottom surface of the round hole 6 and the upper end surface of the device base 3 are controlled within 0.01 mm.
As shown in fig. 5, the positioning plate 4 is a circular thin plate, a pin hole 8 is formed in the center of the circle and connected with the testing machine base through a positioning pin, and a spring is connected to one surface of the thin plate and used for uniformly applying pressure to the probe so that the probe is tightly attached to the bottom surface of the circular hole 6 of the device base 3. The tolerance zone of the positioning plate 4 is arranged below the tolerance zone of the round hole on the device base 3, and the tolerance zone and the round hole are in clearance fit, so that the disassembly convenience is guaranteed on one hand, and the base is guaranteed not to generate large horizontal sliding on the other hand.
The structural design of the device pressure head, the device base and the positioning plate is matched with the control of the flatness, so that the centering of the axial probe assembled in the device can be well guaranteed, namely, a pair of axial probes can be basically positioned on the same axis, and the measurement precision is guaranteed. Other auxiliary devices can be used for realizing the coaxiality of the mounting position of the axial probe mounted in the hollow cylinder.
As shown in fig. 1, 6 and 7, the transverse probe mounting structure 5 disposed outside the device base 3 includes a support plate 12 having a central hole 9, four columns 13 are symmetrically disposed around the central hole 9, each column 13 is connected to a support plate 14 parallel to the support plate 12 and having a same height, the support plate 14 is used for connecting a transverse probe, the support plate 14 is fixedly connected to a screw 15, the screw 15 is slidably connected to the column 13 and is limited by a nut 16, the support plate 14 is provided with a probe mounting hole 17, a pair of transverse probes can be mounted on the support plates 14 of any two opposite columns 13, and the distance between the probe end and the test piece 18 can be adjusted and fixed by the screw 15 and the nut 16, so that the probe 11 and the test piece 18 are tightly attached. The tolerance zone of the central hole 9 of the transverse probe mounting structure 5 is above the tolerance zone of the excircle diameter of the base 3, and the two are in clearance fit.
When the experimental device is used for carrying out an ultrasonic experiment in a uniaxial compression state, the experiment is carried out according to the following steps:
(1) vaseline is uniformly coated on the bottom surface of the circular hole of the device pressure head 2, the two end surfaces of the test piece 18 and the bottom surface of the circular hole of the device base 3 to serve as a coupling agent, so that good propagation of ultrasonic waves on an interface is guaranteed, and after the work is finished, the sound wave probe is horizontally placed into the circular holes of the device pressure head 2 and the device base 3.
(2) And (3) enabling a binding post of the transverse wave velocity probe to penetrate through a probe mounting hole 17 on the supporting plate 14, connecting the probe with the feeder line, and screwing a threaded sleeve of the probe 11 to complete the connection between the screw 15 and the probe 11.
(3) The top cover 1 is fixedly connected with a device pressure head 2 with a built-in probe through a through hole 3 and is fixedly connected with a tester pressure head through a stud and a central threaded hole 10.
(4) Connecting the positioning plate 4 with the testing machine base through the positioning pin and the pin hole 8, placing a spring 11 on the positioning plate 4, placing the device base 3 with the built-in probe on the positioning plate 4, and sleeving the support plate 12 of the transverse probe mounting structure 5 on the device base 3; the screw rods 15 connected with the probes 11 respectively penetrate through the mounting holes at the upper ends of the upright posts 13, and the screw rods 15 are fixedly connected with the support plate 12 through nuts 16.
(5) And placing the test piece 18 pasted with the strain gauge on the device base 3, starting the testing machine to enable the bottom surface of the device pressure head 2 to be in contact with the end surface of the test piece 18, and prepressing for thirty minutes to ensure that the device pressure head 2, the device base 3 and the test piece 18 are in full contact.
(6) The position of the nut 16 is adjusted, the screw 15 is pushed to adjust the distance between the transverse probe and the side surface of the test piece, and after the probe is confirmed to be in full contact with the surface of the test piece, the nut 16 is screwed to position the screw 15. The support plate 12 is used as a support, and the transverse wave speed change in each direction can be tested through the screw 15 and the two groups of transverse probes 11 on the support plate 14, and the full coupling of the probes and the test surface of a test sample and the centering degree between the transmitting probes and the receiving probes can be ensured.
(7) And starting the testing machine, setting the loading rate, and collecting wave velocity waveforms of the test piece 18 in different directions under different stress levels.
The utility model discloses an experimental apparatus is through built-in with the probe, can directly detect the axial wave speed of unipolar pressurized test piece to can fully guarantee the heart degree between transmitting probe and the receiving probe. The supporting plate and the upright post are used as supports, the transverse probe is installed through the supporting plate connected with the screw rod, wave velocity changes in all directions can be tested, and sufficient coupling between the probe and the test surface of the test sample and the alignment degree between the transmitting probe and the receiving probe can be guaranteed.
In designing and processing the utility model discloses an during experimental apparatus, the utility model discloses experimental apparatus has at first proposed the utility model discloses experimental apparatus's overall structure is including the top cap that is used for being connected with the testing machine pressure head, be used for on the fixed test piece pressurized direction respectively, the device pressure head and the device base of lower surface, and device pressure head and device base adopt similar structural shape, all roughly adopt integrated into one piece's solid of revolution structure, the center is provided with the probe and holds the cavity, set up the wire casing that allows the probe feeder to pass through in the part of lateral wall, and simultaneously, the device base passes through device base limit structure and is connected with the testing machine base, and can further set up horizontal probe mounting structure in the device base outside.
The aim of the device is not only to facilitate the mounting of the probe, but also to keep the stress transmission direction as consistent as possible with the device when not in use. The utility model discloses a device needs to reserve the cavity in device pressure head and device base and is used for installing the sound wave probe, is utilizing the loading equipment loading, and pressure head atress in-process, cavity can lead to stress concentration phenomenon, and the pressure head can produce certain influence to the transmission of force simultaneously. Therefore, the inventor carries out mechanical analysis and strength check on the pressure head and the base of the designed device, further adopts numerical software to repeatedly simulate the stress distribution in the device under the condition of uniaxial loading to optimize the body structure of the pressure head and the base of the device which influence the stress conduction between the axial probes, and finally designs a group of comparison experiments for verifying the consistency of the stress-strain curve and the peak strength of the sample before and after the device is additionally installed. It is briefly right below that the utility model building and optimization process is described.
The utility model discloses an Abacus carries out numerical simulation to solid cylinder pressure head/base, hollow cylinder pressure head/base (pressure head/base appearance is cylindrical but has circular counter bore to hold the chamber as the probe) and the device pressure head of embodiment/three kinds of form pressure head of base/base under the same stress condition stress distribution, the restraint of model is stress boundary condition, the load is face power, the size is 50Mpa, the simulation result shows, there is certain stress concentration phenomenon in the outer circumference part of solid cylinder pressure head/base and test piece contact surface, the stress extreme value is 343.1Mpa, stress distribution is comparatively even; the stress concentration phenomenon of the hollow cylindrical pressure head/base is intensified, the stress extreme value is 379.9Mpa, and the stress distribution of the end part of the test piece is extremely uneven; the pressure head/base of the device of the embodiment has the stress concentration phenomenon, the stress extreme value is 336.1Mpa, the pressure head/base is closer to a solid cylindrical pressure head/base, and the stress distribution is more uniform than that of a hollow cylindrical pressure head/base.
In addition, the inventor adopts two kinds of marble test pieces, a sandstone test piece that have the same property respectively to carry out the unipolar compression experiment of rock, and the controlled variable of experiment is whether the experimental apparatus of embodiment is loaded, whether contrastively analyzed and used the utility model discloses an experimental apparatus is to the influence of different grade type rock stress-strain curve and peak strength uniformity, and the experimental result and analysis are as shown in fig. 8-10.
The results of the rock peak strength control are shown in table 1 below.
TABLE 1 rock Peak Strength control results
| Experimental groups | Mb-1 | Mb-2 | Sd-1 |
| With pressure head (Mpa) | 78.98 | 66.93 | 33.95 |
| No pressure head (Mpa) | 76.1 | 68.07 | 33.44 |
| Relative error (%) | 3.78 | -1.67 | 1.53 |
Note: mb-1, Mb-2 and Sb-1 in the experimental group, wherein Mb represents marbles, and Sb represents sandstone; "-1" "and" "2" represent the second set of samples in this type of rock.
The experimental result shows that the stress-strain curve goodness of fit of the front and back of the experimental device of the same group of rock loading embodiments is extremely high, the relative error of the peak intensity is not more than 4%, and the influence of the pressure head on the peak intensity of the rock can be basically ignored in consideration of the individual difference of the rock.
When the device is used for the comparison experiment, the sonic viewer ultrasonic detector produced by the company of Japan OYO is used in a matching way, the instrument has the advantages of large sampling frequency, high precision and clear waveform, and has excellent transverse wave testing performance compared with similar products in the market.
Claims (10)
1. Unipolar compression experimental apparatus, characterized by: the device comprises a top cover, a device pressure head and a device base which are sequentially arranged along a pressurizing direction, wherein the top cover is fixedly connected with the device pressure head, the working surfaces of the device pressure head and the device base are opposite, a test piece mounting position is arranged between the two working surfaces, the top cover is used for being connected with the pressure head of a testing machine, the appearance of the device pressure head is a combination of a coaxial hollow cylinder and a monotone reducing solid revolving body, a wire groove is formed in the side wall of the hollow cylinder, the appearance of the device base is a combination of the coaxial monotone reducing solid revolving body and the hollow cylinder, a wire groove is also formed in the side wall of the hollow cylinder of the device base, the smaller end surfaces of the diameters of the two monotone reducing solid revolving bodies are the working surfaces, and the inner side of the.
2. The uniaxial compression test apparatus of claim 1, wherein: the monotone diameter-changing solid revolving body of the pressure head of the device and the monotone diameter-changing solid revolving body of the base of the device are round tables.
3. The uniaxial compression test apparatus of claim 2, wherein: the bottom surface with the larger diameter of the circular truncated cone is respectively superposed with the bottom surface of the round hole in the hollow cylinder.
4. The uniaxial compression test apparatus of claim 1, wherein: the monotone diameter-changing solid revolving body of the pressure head of the device and the monotone diameter-changing solid revolving body of the base of the device are all spherical segments.
5. The uniaxial compression test apparatus of claim 1, wherein: the processing planeness of the bottom surface of the round hole of the device pressure head and the working surface of the round hole of the device pressure head is less than or equal to 0.01mm, and the processing planeness of the bottom surface of the round hole of the device base and the working surface of the round hole of the device base is less than or equal to 0.01 mm.
6. The uniaxial compression test apparatus of claim 1, wherein: the device base limiting structure is a positioning plate which is a circular plate, one surface of the center of the positioning plate is provided with a positioning pin hole, the other surface of the center of the positioning plate is provided with a spring, and the positioning plate and the device base are in clearance fit.
7. The uniaxial compression test apparatus of claim 1, wherein: the device is characterized in that a transverse probe mounting structure is arranged on the outer side of a hollow cylinder of the device base and comprises a support plate provided with a central hole, the central hole of the support plate is in clearance fit with the outer circle of the base, four stand columns which are in cross symmetrical distribution are arranged on the periphery of the central hole, a support plate which is parallel to the support plate and has the same height is connected to each stand column, and the support plate is used for connecting a transverse probe.
8. The uniaxial compression test apparatus of claim 7, wherein: the supporting plate is fixedly connected with a screw, the screw is connected with a mounting hole at the upper end of the upright column in a sliding mode and limited through a nut, and a probe mounting hole is formed in the supporting plate.
9. The uniaxial compression test apparatus of claim 1, wherein: the top cap is connected with the testing machine pressure head through a central threaded hole and a matched bolt.
10. The uniaxial compression test apparatus of claim 1, wherein: the top cover is connected with the device pressure head through three screws distributed in a triangular mode, and the device pressure head is provided with corresponding screw holes.
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| CN201921324592.7U CN210803117U (en) | 2019-08-15 | 2019-08-15 | Uniaxial compression experimental device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411834A (en) * | 2019-08-15 | 2019-11-05 | 四川大学 | Uniaxial compression experimental provision |
| CN112033798A (en) * | 2020-08-26 | 2020-12-04 | 北京理工大学 | Baxinge effect test fixture |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110411834A (en) * | 2019-08-15 | 2019-11-05 | 四川大学 | Uniaxial compression experimental provision |
| CN112033798A (en) * | 2020-08-26 | 2020-12-04 | 北京理工大学 | Baxinge effect test fixture |
| US11674871B2 (en) | 2020-08-26 | 2023-06-13 | Beijing Institute Of Technology | Bauschinger effect test fixture |
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