CN220063604U - Combined structure shear torsion tension compression composite test device - Google Patents
Combined structure shear torsion tension compression composite test device Download PDFInfo
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- CN220063604U CN220063604U CN202321007931.5U CN202321007931U CN220063604U CN 220063604 U CN220063604 U CN 220063604U CN 202321007931 U CN202321007931 U CN 202321007931U CN 220063604 U CN220063604 U CN 220063604U
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- 238000012360 testing method Methods 0.000 title claims abstract description 167
- 238000007906 compression Methods 0.000 title claims abstract description 38
- 230000006835 compression Effects 0.000 title claims abstract description 36
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 25
- 238000010008 shearing Methods 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 9
- 238000012669 compression test Methods 0.000 claims description 9
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 5
- 239000004567 concrete Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000011384 asphalt concrete Substances 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a shearing, twisting, pulling and pressing composite test device with a combined structure, which comprises a test bed, wherein a test piece lower die is fixedly connected to the test bed, a movable test piece upper die opposite to the test piece lower die is arranged above the test piece lower die, and an integrated pressure bar assembly capable of providing shearing, stretching, twisting and compression stress is arranged on the test piece upper die. During the test, fix the test piece between the upper die of test piece and test piece lower mould, through integrated depression bar subassembly, can once only accomplish the test of shearing, tensile, torsion, compression of test piece, compare in current separately testing, it can be fine the true situation of reduction interface atress, the test accuracy is high to labour saving and time saving has improved test efficiency greatly.
Description
Technical Field
The utility model relates to a composite test device integrating shearing, torsion, stretching and compression, belonging to the technical field of pavement structure performance test devices.
Background
Asphalt concrete can meet the driving requirement well because of its smooth and seamless surface, good flexibility and small noise, and is widely used in urban roads. The cement concrete has the characteristics of high rigidity, durability, compression resistance, fracture resistance and the like, but has poor driving comfort, high noise and complex maintenance. In order to make full use of the characteristics of asphalt concrete and cement concrete, cement concrete and asphalt concrete composite pavement structures are used for high-performance pavements, such as tunnel pavements and the like. Engineering practices, however, indicate that composite structural failure is mostly related to failure or insufficient strength of the interfacial layer. Because there is an interface between the asphalt upper layer and the cement concrete slab where the shear resistance and cohesiveness are weak. Because of the different characteristics of asphalt and cement materials, the weak interface can bear limited composite force, and is easy to generate interface damage under the action of vertical load and horizontal load of a vehicle.
However, the current test equipment for testing interface damage does not integrate shear, tensile, torsion and compression tests, and a plurality of tests are often needed to be carried out to obtain mechanical data. These separately performed tests are time consuming and laborious and do not restore the true condition of interface stress well. In the stress condition of a real pavement interface, various force compound actions such as shearing, twisting, pulling, pressing and the like exist. Therefore, it is necessary to design a test device for composite stress, which is necessary to reflect the stress condition of the real pavement interface.
Disclosure of Invention
In view of the above, the utility model aims to provide a combined structure shear-torsion-tension-compression composite test device which can overcome the defects in the prior art.
The utility model aims at realizing the following technical scheme:
the utility model provides a composite test device is twisted to integrated configuration shear, draws and presses, includes the test bench, has linked firmly the test piece lower mould on the test bench, and its top is equipped with the movable test piece upper die relative with its position to be equipped with on the test piece upper die and can provide the integrated depression bar subassembly of shearing, tensile, torsion and compression atress.
The integrated pressure bar assembly comprises an upper pressure bar, a lower pressure bar and a side pressure bar which are respectively abutted against the top surface, the bottom surface and the front side surface and the rear side surface of the upper die of the test piece; the upper pressure bar, the lower pressure bar and the side pressure bar are all arranged on the test bed in a penetrating way, one end of the upper pressure bar, the lower pressure bar and the side pressure bar are respectively vertically abutted with the upper die of the test piece, and the other end of the upper pressure bar, the lower pressure bar and the side pressure bar are connected with a transmission device of the test bed.
Limiting grooves are respectively formed in the top surface, the bottom surface, the front side and the rear side of the upper die of the test piece, and the upper pressing rod, the lower pressing rod and the side pressing rod are clamped in the limiting grooves.
The upper pressing rod is at least one piece arranged at the center of the top surface of the upper die of the test piece.
The lower pressure rods are at least two pieces symmetrically arranged on two sides of the bottom surface of the upper die of the test piece.
The side compression bars are at least four and symmetrically and uniformly distributed on the front side and the rear side of the upper die of the test piece.
Pressure sensors are arranged at the top ends of the upper pressure bar, the lower pressure bar and the side pressure bars.
The test piece lower die is fixedly connected to the table top of the test bed through a bolt, and a lower groove for placing a test piece is formed in the middle of the top surface of the test piece lower die; the test piece upper die is arranged above the test piece lower die, an upper groove opposite to the lower groove is formed in the middle of the bottom surface of the test piece upper die, and adhesive is coated on the inner bottom surface of the lower groove and the inner top surface of the upper groove.
The inner bottom surface of the lower groove and the inner top surface of the upper groove are respectively provided with a wave-shaped structure, and the adhesive is coated on the wave-shaped structures.
The adhesive is epoxy resin.
Compared with the prior art, the shearing, twisting, pulling and pressing composite test device with the combined structure comprises a test bed, wherein a test piece lower die is fixedly connected to the test bed, a movable test piece upper die opposite to the test piece lower die in position is arranged above the test piece lower die, and an integrated pressure bar assembly capable of providing shearing, stretching, twisting and compression stress is arranged on the test piece upper die. During the test, fix the test piece between the upper die of test piece and test piece lower mould, through integrated depression bar subassembly, can once only accomplish the test of shearing, tensile, torsion, compression of test piece, compare in current separately testing, it can be fine the true situation of reduction interface atress, the test accuracy is high to labour saving and time saving has improved test efficiency greatly.
The beneficial effects of the utility model include:
(1) And (3) composite simulation: the device can compound and simulate the complex stress condition of the combined structure under the action of the running load through different force transmission conditions of the upper pressure bar, the lower pressure bar and the side pressure bar, and the test result is more similar to the real stress condition, so that the test result is more scientific;
(2) Force decoupling: the shearing, twisting, pulling and pressing of the device are transmitted through different rods, complex stress is decoupled, the complex stress can be effectively converted into a complex stress condition through the pressure, a complex sensor device such as a torque sensor is not needed, and complex stress sensing can be realized through a simple pressure sensor; the test cost is greatly saved;
(3) Time and labor saving: the common test device is separated aiming at the simulation of different mechanical conditions, namely, the test personnel need to prepare the same test piece to simulate different stress conditions, and the test piece preparation and the test are more time-consuming and labor-consuming than the device.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be described in further detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the front structure of the present utility model;
FIG. 2 is a schematic top view of the present utility model;
fig. 3 is a schematic diagram of the top surface structure of the lower mold 4 of the test piece.
In the figure: 1-a pressure sensor; 2-pressing a rod; 3-upper die of the test piece; 4-a lower die of the test piece; 5-fixing screws; 6-a screw cap; 7-a test piece with a combined structure; 8-pressing down a rod; 9-a test bed; 10-side compression bar; 11-wave structure; 12-screw holes; 13-press bar hole.
Detailed Description
Hereinafter, preferred embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
As shown in figures 1-3, the combined structure shear-torsion-tension-compression combined test device comprises a test bed 9, wherein a test piece lower die 4 is fixedly connected to the test bed 9, a movable test piece upper die 3 opposite to the test piece lower die is arranged above the test piece lower die, and an integrated compression bar assembly capable of providing shearing, stretching, torsion and compression stress is arranged on the test piece upper die 3.
The integrated pressure bar assembly comprises an upper pressure bar 2, a lower pressure bar 8 and a side pressure bar 10 which are respectively abutted against the top surface, the bottom surface and the front side surface and the rear side surface of the upper die 3 of the test piece; the upper compression bar 2, the lower compression bar 8 and the side compression bar 10 are all arranged on the test bed 9 in a penetrating way, one end of the upper compression bar is respectively vertically abutted with the test piece upper die 3, the other end of the upper compression bar is connected with a transmission device of the test bed, and the force transmission control of each compression bar is realized through the transmission device.
Limiting grooves are respectively formed in the top surface, the bottom surface, the front side and the rear side of the upper die 3 of the test piece, and the upper pressing rod 2, the lower pressing rod 8 and the side pressing rod 10 are clamped in the limiting grooves, so that the upper pressing rod 2, the side pressing rod 10 and the lower pressing rod 8 can conveniently contact and transfer force.
Specifically, the upper compression bar 2 is at least one piece arranged in the center of the top surface of the upper die 3 of the test piece; compression testing of the test piece can be accomplished by applying pressure.
The lower pressure rods 8 are at least two pieces symmetrically arranged on two sides of the bottom surface of the test piece upper die 3; the stretching of the test piece can be realized through the force transmission below.
The lateral compression rods 10 are at least four and symmetrically and uniformly distributed on the front side and the rear side of the test piece upper die 3, and torsion and shearing of the test piece can be realized through the difference of force transmission.
Pressure sensors 1 are arranged at the top ends of the upper pressure rod 2, the lower pressure rod 8 and the side pressure rods 10 and are used for measuring the pressure transmitted by each pressure rod.
The test piece lower die 4 is fixedly connected to the table top of the test stand 9 through bolts, a lower groove for placing a test piece is formed in the middle of the top surface of the test piece lower die, and an adhesive is coated on the inner bottom surface of the lower groove for adhering and fixing the test piece.
The test piece upper die 3 is arranged above the test piece lower die 4, the test bed and the test piece lower die are provided with mutually communicated pressure-down rod holes 13, and the pressure-down rods are arranged in the pressure-down rod holes 13 in a penetrating manner and are abutted to the bottom surface of the test piece upper die 3; an upper groove opposite to the lower groove is formed in the middle of the bottom surface of the upper die 3 of the test piece, and an adhesive is coated on the inner top surface of the upper groove and used for adhering and fixing the test piece.
Preferably, the inner bottom surface of the lower groove and the inner top surface of the upper groove are respectively provided with a wave-shaped structure 11, and the adhesive is coated on the wave-shaped structure 11, so that the adhesive effect is better.
The binder may be an epoxy resin or the like.
The specific test flow is as follows:
(1) The test piece 7 with the combined structure is prepared and placed in an incubator for preheating;
(2) Coating epoxy resin on the inner bottom of the lower groove of the test piece lower die 4, and placing the preheated test piece 7 with the combined structure above for fixing;
(3) Coating epoxy resin on the inner top surface of the upper groove of the test piece upper die 3, reversely buckling the upper groove and the lower groove to be arranged above the test piece 7 with the combined structure, and pressing and fixing the upper groove;
(4) Solidifying the whole adhered test mould and test piece in a temperature insulation box required by the test for 24 hours;
(5) Taking out the test die and the test piece, placing the test die and the test piece on the table top of a test bed 9 of the device, enabling a screw hole 12 of a lower die 4 of the test piece to be exactly aligned with a fixed screw 5 on the test bed 9, and screwing and fixing the test die and the test piece by using a screw cap 6;
(6) An upper pressing rod 2, a lower pressing rod 8 and a side pressing rod 10 on the adjusting test bed 9 are sensed by the pressure sensor 1 to enable the pressure sensor to be just contacted with the upper die 3 of the test piece,
specifically, an initial stress value of the pressure sensor 1 is set to be 0, a reaction force is generated after the pressure lever contacts the test piece, and the pressure lever is judged to just contact the upper die 3 of the test piece through the change of the force value;
(7) Setting a test scheme on a controller of the transmission device, and setting parameters such as a stress mode, stress time and the like of the transmission device;
(8) After the parameters are set, starting a test device, and controlling an upper pressing rod 2, a lower pressing rod 8 and a side pressing rod 10 on a test bed 9 by the test device according to a set program to simulate the composite stress condition of the test piece 7 with the combined structure;
(9) After the test is finished, firstly loosening the upper compression bar 2, the lower compression bar 8 and the side compression bar 10 on the test bed 9, unscrewing the screw cap 6, and taking down the test die and the test piece;
(10) And taking down the test piece by knocking and other methods, and cleaning the upper test piece die 3 and the upper test piece die 4 for later experiments.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variations and modification made to the above embodiment according to the technical matter of the present utility model without departing from the technical scope of the present utility model still fall within the scope of the technical scheme of the present utility model.
Claims (9)
1. The utility model provides a composite test device is twisted to combined structure shear, which characterized in that: the test bed comprises a test bed (9), wherein a test piece lower die (4) is fixedly connected to the test bed (9), a movable test piece upper die (3) opposite to the test piece lower die is arranged above the test bed, and an integrated compression bar assembly capable of providing shearing, stretching, torsion and compression stress is arranged on the test piece upper die (3);
the integrated pressure bar assembly comprises an upper pressure bar (2), a lower pressure bar (8) and a side pressure bar (10) which are respectively abutted against the top surface, the bottom surface and the front side surface and the rear side surface of the upper die (3) of the test piece; the upper compression bar (2), the lower compression bar (8) and the side compression bar (10) are all arranged on the test bed (9) in a penetrating mode, one end of the side compression bar is respectively vertically abutted to the test piece upper die (3), and the other end of the side compression bar is connected with a transmission device of the test bed.
2. The composite structural shear, torsion, tension and compression test device according to claim 1, wherein: limiting grooves are respectively formed in the top surface, the bottom surface, the front side and the rear side of the upper die (3) of the test piece, and the upper compression bar (2), the lower compression bar (8) and the side compression bar (10) are clamped in the limiting grooves.
3. The composite structural shear, torsion, tension and compression test device according to claim 2, wherein: the upper pressing rod (2) is at least one piece of material arranged in the center of the top surface of the test piece upper die (3).
4. The composite structural shear, torsion, tension and compression test device according to claim 2, wherein: the lower pressure rods (8) are at least two pieces symmetrically arranged on two sides of the bottom surface of the test piece upper die (3).
5. The composite structural shear, torsion, tension and compression test device according to claim 2, wherein: the lateral compression rods (10) are at least four and symmetrically and uniformly distributed on the front side and the rear side of the test piece upper die (3).
6. The composite structural shear, torsion, tension and compression test device according to any one of claims 2-5, wherein: pressure sensors (1) are arranged at the top ends of the upper pressure rod (2), the lower pressure rod (8) and the side pressure rod (10).
7. The composite structural shear, torsion, tension and compression test device according to claim 1, wherein: the test piece lower die (4) is fixedly connected to the table top of the test stand (9) through bolts, and a lower groove for placing a test piece is formed in the middle of the top surface of the test piece lower die; the upper test piece die (3) is arranged above the lower test piece die (4), an upper groove opposite to the lower groove is formed in the middle of the bottom surface of the upper test piece die (3), and adhesive is coated on the inner bottom surface of the lower groove and the inner top surface of the upper groove.
8. The composite structural shear, torsion, tension and compression test device according to claim 7, wherein: the inner bottom surface of the lower groove and the inner top surface of the upper groove are respectively provided with a wave-shaped structure (11), and the adhesive is coated on the wave-shaped structures (11).
9. The composite structural shear, torsion, tension and compression test device according to claim 8, wherein: the adhesive is epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321007931.5U CN220063604U (en) | 2023-04-28 | 2023-04-28 | Combined structure shear torsion tension compression composite test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321007931.5U CN220063604U (en) | 2023-04-28 | 2023-04-28 | Combined structure shear torsion tension compression composite test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220063604U true CN220063604U (en) | 2023-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321007931.5U Active CN220063604U (en) | 2023-04-28 | 2023-04-28 | Combined structure shear torsion tension compression composite test device |
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| Country | Link |
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| CN (1) | CN220063604U (en) |
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- 2023-04-28 CN CN202321007931.5U patent/CN220063604U/en active Active
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