CN220154117U - Device for testing compression performance of fiber polymer ribs - Google Patents
Device for testing compression performance of fiber polymer ribs Download PDFInfo
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- CN220154117U CN220154117U CN202320722812.1U CN202320722812U CN220154117U CN 220154117 U CN220154117 U CN 220154117U CN 202320722812 U CN202320722812 U CN 202320722812U CN 220154117 U CN220154117 U CN 220154117U
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- 238000007906 compression Methods 0.000 title claims abstract description 30
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- 239000010959 steel Substances 0.000 claims description 24
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 23
- 238000002474 experimental method Methods 0.000 claims description 14
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- 238000004873 anchoring Methods 0.000 claims description 8
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- 239000011151 fibre-reinforced plastic Substances 0.000 description 2
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model relates to the technical field of composite material mechanical property testing, in particular to a device for testing compression performance of fiber polymer ribs. The supporting frame of the device comprises an upper fixed plate and a lower fixed plate, wherein a guide pillar is vertically arranged between the upper fixed plate and the lower fixed plate, a sliding plate is arranged on the guide pillar in a sliding manner, an upper connecting piece is arranged at the central position of the upper fixed plate in a sliding manner, the upper end of the upper connecting piece is connected with the loading head of the experimental machine, and the lower end of the upper connecting piece is connected with the sliding plate; the guide post is sleeved with a spring positioned between the sliding plate and the lower fixed plate, and a fixing mechanism is further arranged between the sliding plate and the lower fixed plate. The utility model can accurately test the ultimate strain, compressive strength and elastic modulus of the fiber polymer rib, and can accurately test the compressive state of the fiber polymer rib after reaching the ultimate bearing capacity and the stress-strain full curve under the action of axial compression.
Description
Technical Field
The utility model relates to the technical field of composite material mechanical property testing, in particular to a device for testing compression performance of fiber polymer ribs.
Background
Rust of steel materials such as ribs, steel anchors, steel strands and the like seriously affects the bearing capacity and the normal service life of the reinforced concrete structure. The corrosion-resistant treatment of steel has become an important measure for solving the rust of the steel, and mainly comprises the following steps: and an epoxy resin wrapping layer, a galvanized layer, a fiber reinforced polymer protective layer, a cathode protection layer and the like are added on the surface of the steel bar. However, these measures can only delay the corrosion rate of the steel, and cannot fundamentally solve the adverse effect of the steel corrosion on the structure, and the maintenance and repair of the structure also consume huge manpower and financial resources, so that a novel material is needed to replace the steel to be applied to engineering practice, and the problem of steel corrosion is fundamentally solved. The fiber polymer (Fiber Reinforced Polymer, FRP for short) rib is a novel material which is formed by a continuous fiber reinforced resin matrix and has light weight, high strength, corrosion resistance and fatigue resistance.
Because of the complex properties of the fiber polymer tendons under compression and the different failure modes, there is currently no device and method for testing and characterizing the compressive properties of the fiber polymer tendons, and the contribution of the fiber polymer tendons is often ignored in the design and analysis of the fiber polymer tendon concrete columns. In recent years, a great deal of research has shown that the use of fiber polymer tendons in solid and hollow concrete columns is effective, and that the omission of fiber polymer tendons in fiber polymer tendon concrete column designs is overly conservative. However, at present, a device and a method for testing the ultimate strain, the compressive strength and the elastic modulus of the fiber polymer rib during compression are lacking, and when the conventional fiber polymer rib testing device is used for testing the compressive property of the fiber polymer rib, the fiber polymer rib is compressed and damaged, and a large amount of energy can be instantaneously released, so that the full curve of the axial compressive stress-strain of the fiber polymer rib cannot be obtained. Accordingly, there is a need to provide a device for testing compressive properties of a fibrous polymeric tendon to characterize compressive properties of the fibrous polymeric tendon to facilitate its use in concrete columns.
Disclosure of Invention
The utility model provides a device for testing the compressive property of a fiber polymer rib, which is simple in structure and convenient to operate, can accurately test the ultimate strain, compressive strength and elastic modulus of the fiber polymer rib during compression, and can accurately test the compressive state of the fiber polymer rib after reaching the ultimate bearing capacity and the stress-strain full curve under the action of axial compression.
In order to achieve the above object, the technical scheme of the present utility model is as follows: the device for testing the compression performance of the fiber polymer bars comprises an experiment machine, a supporting frame and an anchoring sleeve for fixing a fiber polymer bar test piece, wherein the supporting frame comprises an upper fixed plate and a lower fixed plate, a guide pillar is vertically arranged between the upper fixed plate and the lower fixed plate, a sliding plate is arranged on the guide pillar in a sliding manner, an upper connecting piece is arranged at the central position of the upper fixed plate in a sliding manner, the upper end of the upper connecting piece is connected with a loading head of the experiment machine, and the lower end of the upper connecting piece is connected with the sliding plate; the center position department of lower solid board is provided with down the connecting piece, lower connecting piece upper end extends to lower solid board top, lower extreme are connected with the experimental machine work platform. The loading head of the experiment machine can drive the upper connecting piece to move upwards or downwards, so that the upper connecting piece drives the sliding plate to move upwards or downwards.
The spring between slide and the lower fixed plate is sleeved on the guide pillar, the fixing mechanism is further arranged between the slide and the lower fixed plate and comprises a spherical hinge assembly, a load sensor and a supporting base, the spherical hinge assembly is arranged at the bottom of the slide and corresponds to the lower connecting piece, the load sensor is arranged at the upper end part of the lower connecting piece, the supporting base is arranged at the top of the load sensor, the fixing mechanism is used for fixing the tested FRP ribs, and the load sensor is used for measuring the load force born by the FRP ribs.
Further, the number of the guide posts is four, the upper ends of the guide posts are connected with the upper fixed plate, the lower ends of the guide posts are connected with the lower fixed plate, and the guide posts are used for installing the sliding plate and playing a role in guiding the movement of the sliding plate.
Further, a guide hole is formed in the sliding plate, a flange type linear bearing II matched with the guide pillar is arranged at the guide hole, the guide pillar is sleeved in the flange type linear bearing II, and in the moving process of the sliding plate, the flange type linear bearing II can reduce friction force between the sliding plate and the guide pillar.
Further, a central hole is formed in the upper fixing plate, a first flange type linear bearing matched with the upper connecting piece is arranged at the central hole, the upper connecting piece is sleeved in the first flange type linear bearing, and in the moving process of the upper connecting piece, the first flange type linear bearing can reduce friction force between the upper connecting piece and the upper fixing plate.
Further, a first through hole is formed in the upper end of the upper connecting piece, and an upper pin is inserted into the first through hole; and a second through hole is formed in the lower end of the lower connecting piece, and a lower pin is inserted into the second through hole.
Further, the spherical hinge assembly comprises annular fixed plates, spherical steel bodies, round bases and bolts, the number of the annular fixed plates is two, the two annular fixed plates are connected through the bolts, the upper ends of the bolts are connected to the bottoms of the sliding plates, the spherical steel bodies are movably arranged between the two annular fixed plates, insertion holes are formed in the tops of the spherical steel bodies, connecting rods are vertically arranged at the bottoms of the round bases, the lower ends of the connecting rods are inserted into the insertion holes, and the spherical hinge assembly is used for stabilizing and centering fiber polymer bars and adjusting the eccentricity of fiber polymer bar test pieces in the loading process.
The FRP rib test piece tested by the utility model has the compressive strength ofF in c The compression strength (Mpa) of the FRP rib test piece; f is the maximum load (N) borne by the FRP rib test piece; a is the pressure-bearing area (mm) of the FRP rib test piece 2 ). The elastic modulus of the FRP rib test piece tested by the utility model is +.>In E c The elastic modulus of the FRP rib test piece; f (F) a The load (N) is the load when the stress of the FRP rib test piece is 1/3 of the compressive strength; f (F) 0 The initial load (N) is the initial load when the stress of the FRP bar test piece is 0.5 Mpa; a is the pressure-bearing area (mm) of the FRP rib test piece 2 ) The method comprises the steps of carrying out a first treatment on the surface of the L is the measurement gauge length (mm) of the FRP rib test piece; Δn is the last slave F 0 To F a And the average value (mm) of deformation displacement of two sides of the FRP rib test piece. The utility model tests the limit strain of the FRP rib by a extensometer, and the full curve of stress-strain under the action of the axial pressure of the FRP rib tested by the utility model is obtained by taking the strain value of the FRP rib measured by the extensometer as the abscissa and taking the load applied by the experimental machine as the ordinate measured by a load sensor arranged on the experimental machine and detecting the data through the test.
Through the technical scheme, the utility model has the beneficial effects that:
the utility model has simple structure and convenient operation, can accurately test the ultimate strain, compressive strength and elastic modulus of the fiber polymer rib when in compression, and can accurately test the state of the fiber polymer rib after reaching the ultimate bearing capacity and the stress-strain full curve under the action of axial compression.
According to the utility model, the spring is sleeved on the guide post, so that the deformation of the spring is used for avoiding the instantaneous release of a large amount of energy after the fiber polymer bar test piece is damaged by compression, and the process of releasing the energy after the fiber polymer bar test piece reaches the ultimate bearing capacity is more stable, thereby accurately testing the compression state of the fiber polymer bar test piece after the ultimate bearing capacity and the stress-strain full curve under the action of axial compression.
The utility model can enable the applied load and the fiber polymer bar test piece to be positioned on the same central line through the fixing mechanism, wherein the spherical hinge component is used for fixing the fiber polymer bar test piece, keeping the axis of the fiber polymer bar test piece consistent with the loading central axis, and is used for stably centering the fiber polymer bar test piece and adjusting the eccentricity of the fiber polymer bar test piece in the loading process.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for testing compressive properties of a fibrous polymeric web according to the present utility model;
FIG. 2 is a schematic diagram of a device for testing the compressive property of a fiber polymer rib according to the second embodiment of the present utility model;
FIG. 3 is a schematic diagram of a third embodiment of an apparatus for testing compressive properties of a fibrous polymeric web in accordance with the present utility model;
FIG. 4 is a schematic view of the structure of the fixing mechanism of the present utility model;
fig. 5 is an exploded view of the spherical hinge assembly of the present utility model.
The reference numerals in the drawings are: 1 is an upper fixing plate, 2 is a lower fixing plate, 3 is a sliding plate, 4 is an upper connecting piece, 5 is an upper pin, 6 is a lower connecting piece, 7 is a lower pin, 8 is a guide pillar, 9 is a flange type linear bearing I, 10 is a flange type linear bearing II, 11 is a spring, 12 is a spherical hinge component, 13 is a circular base, 14 is a connecting rod, 15 is an annular fixing plate, 16 is a spherical steel body, 17 is a load sensor, 18 is a supporting base, 19 is an anchoring sleeve, and 20 is a bolt.
Detailed Description
The utility model is further described with reference to the drawings and detailed description which follow:
as shown in fig. 1 to 5, a device for testing the compression performance of a fiber polymer rib comprises an experiment machine, wherein the experiment machine in the embodiment adopts a MTS/SANS CMT6000 series 50Kn electronic universal experiment machine of a meits industrial system (china) limited company, and further comprises a support frame and anchor sleeves 19 for fixing the fiber polymer rib test piece, wherein the number of the anchor sleeves 19 is 2, the anchor sleeves 19 are required to be arranged at two ends of the fiber polymer rib test piece when the fiber polymer rib test piece is subjected to experiments, the axial compression loading of the fiber polymer rib in the experiments can be ensured, the end part of the fiber polymer rib test piece in the loading process can be prevented from being damaged due to stress concentration, so that the experiment result of the fiber polymer rib test piece is prevented from being influenced, the support frame comprises an upper solid plate 1 and a lower solid plate 2, the upper solid plate 1 and the lower solid plate 2 are square plate bodies, guide posts 8 are vertically arranged between the upper solid plate 1 and the lower solid plate 2, the guide posts 8 are stainless steel hollow guide posts, 3 are arranged on the guide posts 8 in a sliding way, the upper solid plate 4 is provided with a sliding way, and the upper solid plate 4 is connected with a sliding bolt 4 at the position of the upper end of the sliding plate 4 and a sliding connection part of the sliding plate 4 is connected with the upper end of the sliding plate 4; the center position department of fixed board 2 down is provided with down connecting piece 6, down connecting piece 6 upper end extends to fixed board 2 top down, lower extreme are connected with experimental machine work platform down, and lower connecting piece 6 can be dismantled with fixed board 2 bolt down and be connected, and the loading head of experimental machine can drive upward or the downward movement of connecting piece 4 to make upward connecting piece 4 can drive slide 3 upward or the downward movement.
The guide pillar 8 is sleeved with a spring 11 positioned between the sliding plate 3 and the lower fixed plate 2, a fixing mechanism is further arranged between the sliding plate 3 and the lower fixed plate 2, the fixing mechanism comprises a spherical hinge assembly 12, a load sensor 17 and a supporting base 18, the spherical hinge assembly 12 is arranged at the bottom of the sliding plate 3 and corresponds to the lower connecting piece 6, the load sensor 17 is arranged at the upper end part of the lower connecting piece 6, the supporting base 18 is arranged at the top of the load sensor 17, the load sensor 17 is used for collecting load data in the loading process of a fiber polymer bar test piece, a groove matched with the anchoring sleeve 19 is formed in the top of the supporting base 18, and the supporting base 18 supports and fixes the fiber polymer bar test piece through the cooperation of the groove and the anchoring sleeve 19. In the experimental process of the fiber polymer bar test piece, the spherical hinge assembly 12 and the supporting base 18 are relatively moved in an oriented manner and are used for fixing the fiber polymer test piece and applying pressure to the fiber polymer test piece, and the spherical hinge assembly 12 is used for fixing the fiber polymer bar test piece and enabling the axis of the fiber polymer bar test piece to be consistent with the loading central axis.
The number of the guide posts 8 is four, the upper ends of the guide posts 8 are connected with the upper fixed plate 1, the lower ends of the guide posts 8 are connected with the lower fixed plate 2, the guide posts 8 are connected with the upper fixed plate 1 and the lower fixed plate 2 through bolts, springs 11 are sleeved on each guide post 8, each spring 11 is mounted at the corners of the upper fixed plate 1 and the lower fixed plate 2, and the guide posts 8 play a role in guiding the movement of the sliding plate 3.
The sliding plate 3 is provided with a guide hole, the guide hole is provided with a flange type linear bearing II 10 matched with the guide pillar 8, the guide pillar 8 is sleeved in the flange type linear bearing II 10, the number of the guide hole and the flange type linear bearing II 10 is 4, in the moving process of the sliding plate 3, the friction force between the sliding plate 3 and the guide pillar 8 can be effectively reduced through the flange type linear bearing II 10, and the sliding plate 3 is also used for providing a depending object for a spherical hinge assembly 12 for applying pressure to a fiber polymer bar test piece.
The upper fixing plate 1 is provided with a central hole, a first flange-type linear bearing 9 matched with the upper connecting piece 4 is arranged at the central hole, the upper connecting piece 4 is sleeved in the first flange-type linear bearing 9, and in the moving process of the upper connecting piece 4, the friction force between the upper connecting piece 4 and the upper fixing plate 1 can be effectively reduced through the first flange-type linear bearing 9.
The upper end of the upper connecting piece 4 is provided with a first through hole, and an upper pin 5 is inserted into the first through hole; the lower end of the lower connecting piece 6 is provided with a second through hole, a lower pin 7 is inserted in the second through hole, the upper connecting piece 4 of the embodiment is connected with the loading head of the experimental machine through the upper pin 5, and the lower connecting piece 6 is connected with the working platform of the experimental machine through the lower pin 7.
The spherical hinge assembly 12 comprises annular fixing plates 15, spherical steel bodies 16, round bases 13 and bolts 20, the number of the annular fixing plates 15 is two, the two annular fixing plates 15 are connected through the bolts 20, the upper ends of the bolts 20 are connected to the bottoms of the sliding plates 3, buffer springs located between the sliding plates 3 and the annular fixing plates 15 located above are sleeved on the upper portions of the bolts 20, the spherical steel bodies 16 are movably arranged between the two annular fixing plates 15, the lower portions of the spherical steel bodies 16 are of spherical structures, the top diameter of the spherical steel bodies 16 is larger than the diameter of the central hole of the annular fixing plates 15, insertion holes are formed in the tops of the spherical steel bodies 16, connecting rods 14 are vertically arranged at the bottoms of the round bases 13, the round bases 13 are mounted on the lower surfaces of the sliding plates 3 through the bolts 20, the lower ends of the connecting rods 14 are inserted into the insertion holes, the round bases 13 are located on the loading central axis of an experimental machine through the connecting rods 14 so that the centers of the spherical assembly 12 are located on the loading central axis, in this embodiment, the two annular fixing plates 15 are further used for limiting the moving range of the spherical steel bodies 16, the fiber centering of the spherical steel bodies 16, and the fiber centering test pieces are accurately stabilized.
The present embodiment is applicable to not only fiber polymer ribs in which two or more fibers of carbon fibers, glass fibers, basalt fibers, aramid fibers, and polymer synthetic fibers are used as reinforcing phases, but also carbon fiber polymer ribs, glass fiber polymer ribs, basalt fiber polymer ribs, aramid fiber polymer ribs, and the like.
The utility model performs the following experimental steps of the compression performance of the fiber polymer rib:
(1) First, a fiber polymer rib test piece for compression performance test was prepared.
(2) The two ends of the fiber polymer bar test piece are anchored by a stainless steel anchoring sleeve 19.
(3) The upper end of the upper connecting piece 4 is connected with the loading head of the experimental machine through an upper pin 5, and the lower end of the lower connecting piece 4 is connected with the working platform of the experimental machine through a lower pin 7.
(4) The experimental machine is controlled, so that the loading head of the experimental machine drives the upper connecting piece 4 to move upwards, the moving distance is based on the fact that the spherical hinge assembly 12 and the supporting base 18 are far away from each other in the vertical direction, and the purpose of the experimental machine is to facilitate the placement of the fiber polymer rib test piece anchored by the anchoring sleeve 19 between the spherical hinge assembly 12 and the supporting base 18. In the process of upward movement of the upper connecting piece 4, the upper connecting piece drives the sliding plate 3 to slide upward on the guide post 8, and the sliding plate 3 drives the spherical hinge assembly 12 to move upward.
(5) The fiber polymer bar test piece is placed in the groove at the top of the supporting base 18, so that the anchor sleeve 19 at one end of the longitudinal direction of the fiber polymer test piece is embedded in the groove at the top of the supporting base 18, and the anchor sleeve 19 at the other end is suspended below the spherical hinge assembly 12.
(6) And controlling the experiment machine, wherein the loading head of the experiment machine drives the upper connecting piece 4 to slowly move downwards until the spherical hinge assembly 12 just props up to the central position of the anchoring sleeve 19 at the upper end of the fiber polymer bar test piece, and stopping the loading head of the experiment machine from moving downwards.
(7) As shown in fig. 4, an extensometer was mounted on the fiber polymer tendon test piece.
(8) The load sensor 17 and extensometer are turned on.
(9) And controlling the testing machine, wherein a loading head of the testing machine applies load to the fiber polymer rib test piece through the spherical hinge assembly 12 until the fiber polymer rib test piece is damaged by compression, and recording data.
The full curves of the ultimate strain, compressive strength and elastic modulus of the fiber polymer test piece and the stress-strain under the action of axial compression can be effectively obtained through recorded data in the experimental process, wherein after the fiber polymer bar test piece is damaged under compression, the spring 11 can effectively prevent the fiber polymer bar test piece from releasing a large amount of energy instantaneously after being damaged under compression.
The above embodiments are only preferred embodiments of the utility model and do not limit the scope of the utility model, so all equivalent changes or modifications made by the technical solution described in the patent claims are included in the scope of the utility model.
Claims (6)
1. The device for testing the compression performance of the fiber polymer bars comprises an experiment machine and is characterized by further comprising a supporting frame and an anchoring sleeve (19) for fixing a fiber polymer bar test piece, wherein the supporting frame comprises an upper fixed plate (1) and a lower fixed plate (2), a guide pillar (8) is vertically arranged between the upper fixed plate (1) and the lower fixed plate (2), a sliding plate (3) is arranged on the guide pillar (8) in a sliding manner, an upper connecting piece (4) is arranged at the central position of the upper fixed plate (1) in a sliding manner, the upper end of the upper connecting piece (4) is connected with a loading head of the experiment machine, and the lower end of the upper connecting piece is connected with the sliding plate (3); a lower connecting piece (6) is arranged at the central position of the lower fixed plate (2), and the upper end of the lower connecting piece (6) extends to the upper part of the lower fixed plate (2) and is connected with an experimental machine working platform;
the guide pillar (8) is sleeved with a spring (11) located between the sliding plate (3) and the lower fixed plate (2), a fixing mechanism is further arranged between the sliding plate (3) and the lower fixed plate (2), the fixing mechanism comprises a spherical hinge assembly (12), a load sensor (17) and a supporting base (18), the spherical hinge assembly (12) is arranged at the bottom of the sliding plate (3) and corresponds to the lower connecting piece (6), the load sensor (17) is arranged at the upper end part of the lower connecting piece (6), and the supporting base (18) is arranged at the top of the load sensor (17).
2. Device for testing the compression performance of a fiber polymer tendon according to claim 1, characterized in that the number of the guide posts (8) is four, the upper ends of the guide posts (8) are connected with an upper fixing plate (1), and the lower ends of the guide posts are connected with the lower fixing plate (2).
3. The device for testing the compression performance of the fiber polymer bars according to claim 1, wherein the sliding plate (3) is provided with a guide hole, a flange type linear bearing II (10) matched with the guide post (8) is arranged at the guide hole, and the guide post (8) is sleeved in the flange type linear bearing II (10).
4. The device for testing the compression performance of the fiber polymer ribs according to claim 1, wherein the upper fixing plate (1) is provided with a central hole, a flange-type linear bearing I (9) matched with the upper connecting piece (4) is arranged at the central hole, and the upper connecting piece (4) is sleeved in the flange-type linear bearing I (9).
5. The device for testing the compression performance of the fiber polymer bars according to claim 1, wherein a first through hole is formed at the upper end of the upper connecting piece (4), and an upper pin (5) is inserted into the first through hole; the lower end of the lower connecting piece (6) is provided with a second through hole, and a lower pin (7) is inserted into the second through hole.
6. The device for testing the compression performance of the fiber polymer bars according to claim 1, wherein the spherical hinge assembly (12) comprises two annular fixing plates (15), two spherical steel bodies (16), a round base (13) and bolts (20), the two annular fixing plates (15) are connected through the bolts (20), the upper ends of the bolts (20) are connected to the bottoms of the sliding plates (3), the spherical steel bodies (16) are movably arranged between the two annular fixing plates (15), insertion holes are formed in the tops of the spherical steel bodies (16), connecting rods (14) are vertically arranged at the bottoms of the round base (13), and the lower ends of the connecting rods (14) are inserted into the insertion holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320722812.1U CN220154117U (en) | 2023-04-04 | 2023-04-04 | Device for testing compression performance of fiber polymer ribs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320722812.1U CN220154117U (en) | 2023-04-04 | 2023-04-04 | Device for testing compression performance of fiber polymer ribs |
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| CN220154117U true CN220154117U (en) | 2023-12-08 |
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