CN110987664B - Ground-pushing type shear strength testing device and testing method thereof - Google Patents
Ground-pushing type shear strength testing device and testing method thereof Download PDFInfo
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- CN110987664B CN110987664B CN201911422247.1A CN201911422247A CN110987664B CN 110987664 B CN110987664 B CN 110987664B CN 201911422247 A CN201911422247 A CN 201911422247A CN 110987664 B CN110987664 B CN 110987664B
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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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
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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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
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
Abstract
The invention relates to the technical field of pavement structure performance testing, in particular to a ground push type shear strength testing device which comprises a control acquisition system, a host, a clamp and a heating and heat-insulating system, wherein the control acquisition system is connected with the host through a pipeline; the heating and heat-preserving system is used for providing required environmental temperature for the host machine, the clamp and the test piece fixed on the clamp; the test piece is provided with two parts which are connected through a plane, the clamp fixes the first part, and the host computer applies force parallel to the plane direction to the other part of the test piece under the control of the control acquisition system. The shear strength tester can be used for shear strength tests of test pieces under different situations, the application range of the test pieces is wide, the limitation of single practical range of the traditional shearing equipment is broken through, the shear strength tester can test the shear strength in different temperature ranges, the actual environment of a road surface can be simulated, and the actual shear strength tester is favorable for reacting the actual shear strength of a bonding material. Meanwhile, the invention also provides a push-to-push type shear strength testing method which has the same technical effect.
Description
Technical Field
The invention relates to the technical field of pavement structure performance testing, in particular to a ground push type shear strength testing device and a testing method thereof.
Background
The asphalt pavement is a main pavement form of a highway in China, and due to the fact that the traffic volume and the axle load are continuously increased, and various reasons such as structural design, construction management and the like of the asphalt pavement, various newly-built and reconstructed asphalt pavements in China generate different types of diseases, the shear failure performance between newly-built pavements is particularly prominent, and the shear failure performance of splicing parts of new and old pavements of an extension road is particularly prominent. Therefore, the method is particularly important for evaluating the shearing resistance of the materials between the asphalt surface course layers of the newly-built road and at the splicing parts of the new road and the old road of the expanded road.
The shear strength evaluation test equipment for the interlayer material of the newly-built road has various types, such as oblique shear, direct shear and torsional shear, but the equipment is easy to bend and deform in the actual experiment process; most of shearing equipment is not provided with a control system and a force transmission loading system, most of the shearing equipment is only provided with a customized shearing clamp, then the clamp is placed in an MTS (pitch mixing material dynamic stability loading equipment) similar to a testing machine, and a loading system and a sensor special for the shearing equipment are not provided.
For the shear strength evaluation of the splicing materials of the new and old pavements of the extension road, the shearing equipment for splicing the new and old pavement splicing test piece is not available at home and abroad at present, and the method for testing the shear strength of the cylindrical splicing test piece is also lacked.
In view of the defects of the existing test equipment and the evaluation method for evaluating the shearing resistance of the materials between the asphalt surface course layers of the newly-built roads and the splicing parts of the new roads and the old roads of the extension roads, the inventor actively researches and innovates based on the practical experience and the professional knowledge which are abundant for many years in the design and manufacture of the products and the application of the theory, and develops a push-type shearing strength test device and a test method thereof so as to have practicability. After continuous research and design and repeated trial production and improvement, the invention with practical value is finally created.
Disclosure of Invention
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a ground-push-type shear strength testing apparatus which is more practical by improving the accuracy of the test, and a ground-push-type shear strength testing method which has the same technical effects and is industrially useful.
In order to achieve the purpose, the invention adopts the technical scheme that: a push-type shear strength test device comprises a control acquisition system, a host, a clamp and a heating and heat-preserving system;
the heating and heat-preserving system is used for providing required environmental temperature for the host machine, the clamp and the test piece fixed on the clamp;
the test piece is provided with two parts which are connected through a plane, the clamp fixes the first part, and the host computer applies force parallel to the plane direction to the other part of the test piece under the control of the control acquisition system.
Furthermore, the main machine comprises a transmission loading system, a tension sensor, a machine base, a cross beam and a pressure head;
the transmission loading system is fixed on the base, the tension sensor is connected with a power output end of the transmission loading system and the cross beam, the pressure head is fixed at the end part of the cross beam, and the cross beam moves along a straight line under the driving of the transmission loading system, so that force is applied to one part of the test piece through the pressure head.
Furthermore, an upright post is further arranged between the cross beam and the pressure head, and the pressure head is movably arranged up and down along the upright post.
Further, the cross beam comprises a hinge seat, a stress body and a sliding guide device;
the hinged seat is hinged with one end of the tension sensor through a rotating shaft, the stress body fixes the hinged seat, and the bottom of the stress body is connected with the sliding guide device to realize linear motion.
Further, the upright post comprises a guide rod, a screw rod and a screw rod nut;
the guide rod is provided with a guide groove for coating the local part of the pressure head, the screw rod nut is in threaded connection with the screw rod and used for fixing the pressure head, the screw rod is arranged in parallel with the length direction of the guide groove, and the screw rod nut drives the pressure head to move linearly along the guide groove in the rotating process of the screw rod.
Further, the clamp comprises two clamping plates for clamping two end faces of the test piece, and the clamping plates are movably arranged and move along a straight line;
the test piece is characterized by further comprising at least two supporting plates which are used for supporting the periphery of the test piece and are arranged at intervals, wherein at least one supporting plate is movably arranged and moves along the same straight line with the clamping plate.
Furthermore, the supporting part of the supporting plate for supporting the test piece comprises at least one layer of cushion layer structure which is adaptive to the surface of the test piece, the increase and decrease of the cushion layer structure are used for adapting to the test pieces with various sizes, and each cushion layer structure is connected with the supporting plate main body through a pressing block.
Further, the clamp comprises two clamping blocks which are used for coating the periphery of the test piece and are symmetrically arranged at the part which is in contact with the test piece, and the two clamping blocks are movably arranged and move along a straight line;
the end part of the pressure head is in adaptive fit with the peripheral shape of the test piece, and the side surface of the pressure head is in fit with the side surface of one of the clamping blocks.
Further, the heating and heat-preserving system comprises a power supply, a heating element, a temperature sensor and a heat-preserving box;
the power supply is controlled by the control acquisition system to realize the on-off of the power supply and a control signal, the heating element is used for realizing the temperature rise in the heat insulation box, and the temperature sensor senses the temperature and feeds the temperature back to the control acquisition system.
A push-to-push shear strength test method comprises the following steps:
s1: preparing or processing a test piece;
s2: installing a test piece and preserving heat;
s3: loading until the test piece is damaged;
s4: calculated shear strength = F/S, where S is the area of failure.
Through the technical scheme, the invention has the beneficial effects that:
1. the shear test of the invention has different clamp forms, can be used for the shear strength of the test piece under different situations, comprises the asphalt interlayer bonding material of new and old roads and the splicing material of the new and old road surfaces of the extension roads, can be suitable for the asphalt surface layer or the water-stable base layer, has wide application range, and breaks the limitation of single practical range of the traditional shearing equipment;
2. the shearing equipment comprises an independent and special control acquisition system, a touch screen, a printer, a microcomputer and the like can be arranged, the device can independently complete a shearing test, the sensor is accurate, a loading force value and an acquisition force value are calibrated, the test result is accurate, the matching degree of a main agent and the clamp is high, the clamp is easy to fix, and the phenomenon of bending deformation of the clamp or a dowel bar is avoided;
3. the control acquisition system, the host, the clamp and the heating and heat-preserving system can be disassembled and assembled, are convenient to carry, and the power supply can adopt vehicle-mounted wiring and can be suitable for field detection;
4. the invention can test the shear strength in different temperature ranges, can simulate the actual environment of the road surface and is beneficial to the reaction of the actual shear strength of the bonding material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a push-to-push shear strength testing apparatus at a first angle;
FIG. 2 is a schematic structural view (90 ° clockwise rotation) of the push-to-pull shear strength tester at a second angle;
FIG. 3 is an enlarged view of a portion of FIG. 1 at A;
FIG. 4 is an enlarged view of a portion of FIG. 2 at B;
FIG. 5 is a schematic structural view of the column;
FIG. 6 is a schematic view of a fixture with a test piece mounted thereon;
FIG. 7 is a schematic structural view of the fixture of FIG. 6 with the test piece removed;
FIG. 8 is a front view of FIG. 7;
FIG. 9 is an enlarged view of a portion of FIG. 7 at C;
FIG. 10 is a schematic view of the installation of the mat structure;
FIG. 11 is another schematic view of the clamp;
FIG. 12 is a schematic view of a ram adapted for use with the fixture of FIG. 11;
reference numerals: the device comprises a transmission loading system 1, a tension sensor 2, a machine base 3, a cross beam 4, a hinged base 41, a stress body 42, a sliding guide device 43, a pressure head 5, a stand column 6, a guide rod 61, a guide groove 61a, a screw rod 62, a screw rod nut 63, a clamping plate 7, a support plate 8, a cushion structure 81, a pressing block 9 and a clamping block 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1 and 2, the ground pushing type shear strength testing device comprises a control acquisition system, a host, a clamp and a heating and heat-preserving system; the heating and heat-preserving system is used for providing required environmental temperature for the host machine, the clamp and the test piece fixed on the clamp; the test piece is provided with two parts which are connected through a plane, the clamp fixes the first part, and the host computer applies force parallel to the plane direction to the other part of the test piece under the control of the control acquisition system. The shear strength testing device can be used for shear strength tests of test pieces under different situations, the test pieces can represent bonding materials between asphalt layers of new and old roads and splicing materials of new and old road surfaces of extension roads, the shear strength testing device is suitable for asphalt surface layers or water-stable base layers, the application range is wide, the limitation that the practical range of the traditional shearing equipment is single is broken, the shear strength testing device can test the shear strength within different temperature ranges, the actual environment of the road surface can be simulated, and the actual shear strength of the bonding materials can be favorably reflected.
The control acquisition system can be composed of a touch screen, a printer and a microcomputer, has stable loading and accurate measurement, can be set with a plurality of curve forms to be selected, thereby quickly and accurately realizing digital calibration of load and extension, can be set with full load protection and position protection, realizes that test data can be randomly accessed, can realize reanalysis of data and curves, specifically comprises local amplification and data reediting, has a programmable test method, can be stored or read, can automatically calculate mechanical property indexes of materials, and prints complete test reports, curves and the like.
As the optimization of the above embodiment, the main machine comprises a transmission loading system 1, a tension sensor 2, a machine base 3, a cross beam 4 and a pressure head 5; the transmission loading system 1 is fixed on the base 3, the tension sensor 2 is connected with a power output end of the transmission loading system 1 and the cross beam 4, the pressure head 5 is fixed at the end part of the cross beam 4, and the cross beam 4 moves along a straight line under the driving of the transmission loading system 1, so that force is applied to one part of the test piece through the pressure head 5. In the above-mentioned host computer structure, force transducer 2 is the collection end of signal, can quantify the pressure head 5 to the force that the test piece was exerted for the operator can confirm the value of the shearing force that the current test piece receives, and the linear motion of crossbeam 4 has guaranteed the certainty of application of force direction, has avoided the test result deviation because of the application of force uncertainty brings. In the preferred scheme, the transmission loading system adopts servo drive speed reducer to move leftwards or rightwards to apply load to the sample, thereby completing the shear strength test of the sample, and having the characteristics of accurate transmission, excellent control, low noise and the like. The transmission principle of the main machine is as follows: the servo driver with high precision and wide speed ratio range receives the electric control signal, controls the servo motor with high precision and wide speed regulation, drives the speed reducer to run, drives the speed reducer to synchronously rotate, and drives the movable cross beam 4 to act, so that the test piece is loaded through the pressure head 5.
In order to adjust the height of the pressure head 5, an upright post 6 is further arranged between the cross beam 4 and the pressure head 5, and the pressure head 5 is movably arranged up and down along the upright post 6. Through the setting of stand 6, can be so that the high position of pressure head 5 can obtain adjusting to applicable in more extensive test piece size, the quick adjustment of edge application of force position.
As shown in fig. 3 and 4, the cross beam 4 includes a hinge base 41, a force-receiving body 42, and a slide guide 43;
the hinge base 41 is hinged with one end of the tension sensor 2 through a rotating shaft, the stress body 42 fixes the hinge base 41, and the bottom of the stress body is connected with the sliding guide device 43 so as to realize linear motion. The hinged connection mode enables the output force direction of the transmission loading system 1 to obtain a certain deviation range, avoids damage to the transmission loading system 1, the tension sensor 2 and the like due to the fact that the transmission process is blocked, effectively ensures the straightness of the movement track of the pressure 5 driven by the cross beam 4 through the sliding guide device 43, and ensures the stability of the shearing force applied to the test piece. In the whole test process, the force born by the force bearing body 42 is large, and a process of multiple reciprocating cycles exists, so that the requirement on the structural strength is large, and in order to obtain a more stable structural form, the service life of the force bearing body can be prolonged by a form of a reinforcing rib and the like.
As shown in fig. 5, the column 6 includes a guide rod 61, a lead screw 62, and a lead screw nut 63; the guide rod 61 is provided with a guide groove 61a for partially coating the pressure head 5, the lead screw nut 63 is in threaded connection with the lead screw 62 and is used for fixing the pressure head 5, the lead screw 62 is arranged in parallel with the length direction of the guide groove 61a, and in the rotating process of the lead screw 62, the lead screw nut 63 drives the pressure head 5 to linearly move along the guide groove 61 a. Wherein, lead screw 62 accessible is fixed with the connecting plate of guide bar 61, and can install drive lead screw 62 pivoted motor on the connecting plate, in above-mentioned structure for the upper and lower position control of pressure head 5 is more convenient, no matter is manual or drive lead screw 62 through the motor and rotate, all comparatively easy realization, can set up the scale on guide bar 61, thereby makes the regulation of position obtain visual, the reading of the numerical value of being convenient for.
As a preference of the above embodiment, two forms of the jig are provided:
the first form:
the clamp comprises two clamping plates 7 for clamping two end faces of the test piece, the clamping plates 7 are movably arranged and move along a straight line, and the clamping force between the two clamping plates 7 can be realized by the extrusion of a screw rod penetrating through the two clamping plates and two nuts in threaded connection with the screw rod; the device also comprises at least two supporting plates 8 which are used for supporting the periphery of the test piece and are arranged at intervals, wherein at least one supporting plate 8 is movably arranged and moves along the same straight line with the clamping plate 7. As shown in fig. 6 to 8, taking a cylindrical test piece as an example, in this embodiment, it is intended to achieve the limitation of the test piece in the length direction through the clamping plate 7, and balance the pressure applied to the test piece by the pressure head 5, the two supporting plates 8 achieve the effective support of the test piece, and ensure the stability of the test piece in the stress process, and at least one of them is movably arranged so that the supporting position can be adjusted according to the size of the test piece, thereby increasing the versatility, in the test process, the lower part of the test piece shown in fig. 6 is fixed by the clamp, the pressure head 5 applies force to the upper part of the test piece, wherein the shearing surface of the test piece is a horizontal plane passing through the axis of the cylinder.
Under this kind of clamp structure, as shown in fig. 9 and 10, preferably, the support part used for supporting the test piece at the support plate 8 includes at least one layer of cushion structure 81 that sets up with test piece surface adaptability, the increase and decrease of cushion structure 81 is used for adapting to the test piece of multiple size, each cushion structure 81 passes through briquetting 9 with the support plate 8 main part to be connected, wherein run through two connecting pieces at briquetting 9 both ends and screw in respectively in cushion structure 81 and the support plate 8 main part, can comparatively convenient realization connection between the two, for the adjustment of briquetting 9 position, the hole site that at least one end is used for running through the connecting piece on the briquetting 9 can be the open slot structure of UNICOM briquetting 9 edge.
The second form:
as shown in fig. 11, the fixture includes two clamping blocks 10 symmetrically disposed on the portion contacting with the test piece for coating the periphery of the test piece, the two clamping blocks 10 are movably disposed and move along a straight line, and the straight line can be ensured by a guiding structure between the bottom of one clamping block 10 and the machine base 3; as shown in fig. 12, the end of the indenter 5 is adapted to fit the peripheral shape of the test piece, in this embodiment, a cylindrical test piece is taken as an example, and the side of the indenter 5 fits the side of one of the clamping blocks 10. In the mode, the shearing surface of the test piece is a plane parallel to the radial direction of the test piece, the force application position of the pressure head 5 can be adapted through the position movement of the two clamping blocks 10, the positioning can be realized through the positioning device after the adjustment, and when force is applied, the superposed surface of the joint side surfaces of the pressure head 5 and the clamping blocks 10 is the shearing surface.
As a preference of the above embodiment, the heating and heat-insulating system includes a power supply, a heating element, a temperature sensor, and an insulating box; the power supply realizes the on-off of the power supply and the control signal under the control of the control acquisition system, the heating element is used for realizing the temperature rise in the heat preservation box, and the temperature sensor senses the temperature and feeds the temperature back to the control acquisition system. The device can also be provided with an instrument panel to read numerical values, the heating temperature range can be 0-100 ℃, one surface of the heat insulation box is transparent, and the test process can be observed conveniently.
A push-to-push shear strength test method comprises the following steps:
s1: preparing or processing a test piece;
s2: installing a test piece and preserving heat;
s3: loading until the test piece is damaged;
s4: calculated shear strength = F/S, where S is the area of failure.
In the specific implementation process, the specific implementation steps of the test method are as follows:
s1: and preparing or processing a test piece, wherein the test piece is a spliced cylindrical test piece, the diameter of the test piece is 10cm or 15cm, and the height of the test piece is 6-20 cm.
For the horizontal trough clamp shown in fig. 6-8:
the test piece preparation process is as follows: the method comprises the steps of forming a cylindrical asphalt mixture test piece or cement stabilized macadam mixture test piece with the diameter of 10cm or 15cm and the height of 6-20 cm, vertically cutting the test piece into two semi-cylinders along the diameter, coating a bonding material along a cutting surface, then placing the other half of the test piece, and forming a cylindrical splicing test piece with a seam in the middle after the bonding material is cured to form strength.
The processing procedure of the test piece is as follows: core is taken to the splicing position of the new and old basic layer surface layer of the field reconstruction and extension project, core is taken along the splicing position of the new and old basic layer or surface layer across the seam, the diameter is 10cm or 15cm, half of the core is ensured to be the old basic layer or surface layer, half of the core is the new basic layer or surface layer, the seam is positioned in the middle, the two surfaces of the core sample taken out are cut flatly, and the height is 6-20 cm.
For the snap-round clip shown in fig. 11 and 12:
the test piece preparation process is as follows: forming a square rut plate test piece with the height of 3-10 cm and the thickness of 30cm x 30cm, wherein the material is an asphalt mixture or a cement-stabilized macadam mixture, coating a sticky layer material on the surface of the test piece after a cold area or curing period, continuing forming a square rut plate test piece with the height of 30cm x 30cm and the thickness of 3-10 cm on the surface of the test piece after the sticky layer material is demulsified, rolling, cooling and demolding, drilling a core sample, drilling the test piece with the diameter of 10cm, and drilling through the test piece with the height of 6-20 cm.
The processing procedure of the test piece is as follows: coring on the site of the road surface, coring the road surface, wherein the diameter is 10cm, the coring height is 6-20 cm, and different structural layers are contained.
S2: and (3) installing test pieces and preserving heat, installing the test pieces in different modes into corresponding test piece clamps, opening the heat preservation box, setting the required temperature (0-100 ℃) and preserving heat for 4-6 hours.
S3: and (3) loading test: and opening the loading system, adjusting the height of the pressure head 5 to ensure that the height of the pressure head 5 is consistent with the loading requirement, then adjusting the loading rate (0-50 mm/min), recording the displacement and the force value after the pressure head 5 is contacted with the test piece until the test piece is sheared and damaged, and recording the maximum force value F at the moment.
S4: and (3) processing test results: calculated shear strength = F/S, where S is the area of failure.
The method is simple to operate, accurate in result, capable of truly reflecting the bonding effect of splicing parts of new and old pavements of the extension project or the bonding effect between pavement layers, and good in application prospect.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A push-type shear strength test device is characterized by comprising a control acquisition system, a host, a clamp and a heating and heat-preserving system;
the heating and heat-preserving system is used for providing required environmental temperature for the host machine, the clamp and the test piece fixed on the clamp;
the test piece is provided with two parts which are connected through a plane, the clamp fixes the first part, and the host machine exerts a force parallel to the plane direction on the other part of the test piece under the control of the control acquisition system;
the main machine comprises a transmission loading system (1), a tension sensor (2), a machine base (3), a cross beam (4) and a pressure head (5);
the transmission loading system (1) is fixed on the base (3), the tension sensor (2) is connected with a power output end of the transmission loading system (1) and the cross beam (4), the pressure head (5) is fixed at the end part of the cross beam (4), and the cross beam (4) moves linearly under the driving of the transmission loading system (1), so that a part of a test piece is applied with force through the pressure head (5);
the cross beam (4) comprises a hinged seat (41), a stress body (42) and a sliding guide device (43);
the hinged seat (41) is hinged with one end of the tension sensor (2) through a rotating shaft, the stressed body (42) fixes the hinged seat (41), and the bottom of the stressed body is connected with the sliding guide device (43) so as to realize linear motion;
the clamp comprises two clamping plates (7) for clamping two end faces of the test piece, and the clamping plates (7) are movably arranged and move along a straight line;
the device also comprises at least two supporting plates (8) which are used for supporting the periphery of the test piece and are arranged at intervals, wherein at least one supporting plate (8) is movably arranged and moves along the same straight line with the clamping plate (7);
the supporting part of the supporting plate (8) for supporting the test piece comprises at least one layer of cushion structure (81) which is adaptive to the surface of the test piece, the increase and decrease of the cushion structure (81) are used for adapting to the test pieces with various sizes, and each cushion structure (81) is connected with the main body of the supporting plate (8) through a pressing block (9).
2. A push-type shear strength test device according to claim 1, wherein a column (6) is further disposed between the beam (4) and the ram (5), and the ram (5) is movably disposed up and down along the column (6).
3. A push-to-ground shear strength test device according to claim 2, wherein said upright (6) includes a guide rod (61), a lead screw (62) and a lead screw nut (63);
have on guide bar (61) right press head (5) local guide way (61 a) of going on the cladding, screw-nut (63) with lead screw (62) threaded connection, and be used for right press head (5) are fixed, lead screw (62) with the length direction parallel arrangement of guide way (61 a) lead screw (62) pivoted in-process, screw-nut (63) drive press head (5) are followed guide way (61 a) linear motion.
4. The push-to-push shear strength test device according to claim 1, wherein the heating and heat-insulating system includes a power supply, a heating element, a temperature sensor, and an incubator;
the power supply is controlled by the control acquisition system to realize the on-off of the power supply and a control signal, the heating element is used for realizing the temperature rise in the heat insulation box, and the temperature sensor senses the temperature and feeds the temperature back to the control acquisition system.
5. A ground-push shear strength test method applied to the ground-push shear strength test apparatus according to claim 1, comprising the steps of:
s1: preparing or processing a test piece;
s2: installing a test piece and preserving heat;
s3: loading until the test piece is damaged;
s4: calculated shear strength = F/S, where S is the area of failure.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422247.1A CN110987664B (en) | 2019-12-31 | 2019-12-31 | Ground-pushing type shear strength testing device and testing method thereof |
| PCT/CN2020/102443 WO2021135162A1 (en) | 2019-12-31 | 2020-07-16 | Ground-push-type shear strength test device and measurement method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911422247.1A CN110987664B (en) | 2019-12-31 | 2019-12-31 | Ground-pushing type shear strength testing device and testing method thereof |
Publications (2)
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| CN110987664B (en) * | 2019-12-31 | 2021-08-10 | 江苏中路工程技术研究院有限公司 | Ground-pushing type shear strength testing device and testing method thereof |
| CN113484107B (en) * | 2021-05-20 | 2023-12-08 | 扬州大学 | Special cutting device of Overlay test piece |
| CN114383955B (en) * | 2021-12-27 | 2023-05-05 | 苏州航天紧固件有限公司 | Tool for measuring shear strength of fastener |
| CN114876672B (en) * | 2022-04-30 | 2023-10-13 | 西安航天动力测控技术研究所 | Device and method for measuring shearing limit of cover body of safety mechanism of solid rocket engine |
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| CN110987664A (en) | 2020-04-10 |
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