An adjustable arbitrary angle polymer fiber monofilament drawing test device

Abstract

The present application belongs to the technical field of drawing test, and particularly relates to a polymer fiber monofilament drawing test device with adjustable arbitrary angle; in the present application, the cement mortar matrix is a cubic block, which is fixed on the top surface of an inclined plate, the polymer fiber is embedded in the cement mortar matrix and perpendicular to the top surface of the cement mortar matrix, the inclined plate is hinged to the base, and the drawing angle of the polymer fiber can be adjusted by rotating the inclined plate; the inclined angle of the inclined plate can be fixed by the positioning mechanism, so that the drawing test of different angles can be conveniently performed; in the present application, the angle of the polymer fiber is adjustable, and the problem that the embedded length of the polymer fiber increases due to the increase of the inclination of the polymer fiber during the pouring process, thereby affecting the bonding strength, does not occur; meanwhile, the present application is convenient to operate, low in cost and practical, and can be measured for multiple times after once assembly.

Description

Technical Field

[0001] This invention belongs to the field of pull-out testing technology, and in particular relates to a polymer fiber monofilament pull-out testing device with adjustable angle. Background Technology

[0002] Concrete is one of the most commonly used materials in engineering construction, boasting advantages such as low cost, wide availability, and high compressive strength. However, concrete also has many drawbacks, including low tensile strength, poor ductility, and susceptibility to cracking. These shortcomings often lead to a series of safety and durability issues in engineering structures.

[0003] Strain-hardening cementitious composites (SHCCs) are ultra-tough fiber-reinforced cementitious composites with multi-crack initiation and strain hardening capabilities. Their uniaxial tensile ultimate strain can reach over 3%, and the maximum crack width at failure can be controlled below 100 μm, making them an effective way to improve the performance of concrete materials. The strain hardening and multi-crack behavior of SHCCs under tension are achieved by adjusting the properties of the polymer microfibers and cementitious materials, as well as the good adhesion between the fibers and the matrix. Therefore, fiber pull-out tests are used to quantitatively measure the interfacial bonding performance between the fibers and the matrix, calculate the bond strength, and establish a crack bridging model to quantitatively describe its macroscopic mechanical behavior.

[0004] However, in SHCC materials, the fibers are randomly distributed, and their crack bridging performance mainly depends on their distribution and orientation relative to their respective crack opening and loading directions. When the fiber orientation deviates from the crack opening direction, the overall crack bridging efficiency of the fibers under tension decreases. Therefore, it is necessary to accurately measure the bonding performance between fibers and the matrix at different inclination angles, obtain the corresponding mechanical parameters, input them into the crack bridging model, and then evaluate the relationship between the micromechanical model and the macroscopic mechanical response, providing a solid experimental foundation for the analytical model of SHCC materials.

[0005] Currently, there are generally two methods for pull-out tests of fibers with different inclination angles: one method is to pre-embed fibers with different inclination angles during the fiber pulling specimen molding process. Placing inclined fibers during casting increases the embedding length due to the increased inclination angle, which has an additional impact on bond strength; the other method is to use angled pads to conduct pull-out tests of fibers with different inclination angles. This method ensures a constant fiber embedding length, but it cannot easily and flexibly change the inclination angle, only measures a single angle, and requires the fabrication of different pads to meet the inclination angle requirements. Furthermore, the pads need to be constantly replaced during pull-out tests, making it cumbersome to use.

[0006] Therefore, an adjustable polymer fiber monofilament pull-out test device with arbitrary angle is needed to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide an adjustable polymer fiber monofilament pull-out testing device to solve the above-mentioned problems.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] An adjustable polymer fiber monofilament pull-out testing device, comprising:

[0010] Base;

[0011] An inclined plate, hinged to the base;

[0012] An adjustment and positioning mechanism is provided between the base and the inclined plate to adjust and fix the angle of the inclined plate;

[0013] A cement mortar matrix with polymer fibers embedded inside is fixed to the side of the inclined plate away from the base.

[0014] Preferably, a connecting portion is provided on one side of the base, the connecting portion comprising:

[0015] Two mounting blocks are fixed to one end of the base, and the two mounting blocks are respectively located on both sides of the base;

[0016] A second through hole is formed on the mounting block, and the two second through holes are coaxially arranged.

[0017] The mounting rod passes through the two second through holes, and both ends of the mounting rod protrude from the two second through holes and are threaded with first nuts. The inclined plate is rotatably connected to the mounting rod.

[0018] Preferably, the inclined plate is located between the two mounting blocks, and a third through hole is provided on the inclined plate. The mounting rod passes through the third through hole and is rotatably connected to the third through hole.

[0019] Preferably, the positioning mechanism includes an adjusting part and a fixing part, the adjusting part including:

[0020] The first through hole penetrates vertically through the base;

[0021] A movable support rod is vertically slidably connected in the first through hole, with both ends of the movable support rod protruding through the first through hole;

[0022] The connecting rod is coaxially fixed to the top end of the movable support rod;

[0023] A slider is fixed to the top of the connecting rod and slidably connected in a groove, which is formed on the bottom surface of the inclined plate.

[0024] Preferably, the fixing part includes:

[0025] A threaded hole is formed on one side of the base and communicates with the first through hole;

[0026] A screw is threaded into the threaded hole, with one end of the screw extending into the first through hole and abutting against the movable support rod.

[0027] Preferably, when the inclined plate is in a horizontal state, the top surface of the base is in contact with the bottom surface of the inclined plate.

[0028] Preferably, a first scale is provided on the outer wall of the movable support rod.

[0029] Preferably, the cement mortar matrix and the inclined plate are bonded together by epoxy resin adhesive.

[0030] Compared with the prior art, the present invention has the following advantages and technical effects:

[0031] In this invention, the cement mortar matrix is ​​a cubic block fixed to the top surface of the inclined plate. The polymer fiber is embedded inside the cement mortar matrix and perpendicular to the top surface of the cement mortar matrix. The inclined plate is hinged to the base. The pull-out angle of the polymer fiber can be adjusted by rotating the inclined plate. The tilt angle of the inclined plate can be fixed by the positioning mechanism, which facilitates pull-out tests at different angles.

[0032] In this invention, the angle of the polymer fiber is adjustable, which avoids the problem of increased polymer fiber embedding length due to the increased inclination angle of the polymer fiber during the casting process, which affects the bonding strength. At the same time, it is easy to operate, low in cost and practical, and multiple measurements can be taken after one assembly. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is an overall schematic diagram of Embodiment 1 of the present invention;

[0035] Figure 2 This is the front view of the present invention;

[0036] Figure 3This is the left view of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0038] The components are as follows: 1. Base; 2. Mounting block; 3. Mounting rod; 4. First nut; 5. Threaded hole; 6. Screw; 7. First through hole; 8. Movable support rod; 9. Inclined plate; 10. Slide groove; 11. Sliding ball; 12. Connecting rod; 13. Second through hole; 14. Cement mortar matrix; 15. Polymer fiber; 16. Third through hole; 17. Slide track; 18. Ball joint block; 19. Second nut. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Reference Figures 1 to 3 This embodiment discloses an adjustable polymer fiber monofilament pull-out testing device, comprising:

[0042] Base 1;

[0043] Inclined plate 9 is hinged to base 1;

[0044] An adjustment and positioning mechanism is set between the base 1 and the inclined plate 9 to adjust and fix the angle of the inclined plate 9;

[0045] A cement mortar matrix 14 with polymer fibers 15 embedded inside is fixed to the side of the inclined plate 9 away from the base 1.

[0046] The design has been further optimized by providing a connecting part on one side of the base 1. The connecting part includes:

[0047] Two mounting blocks 2 are fixed to one end of the base 1, and the two mounting blocks 2 are located on both sides of the base 1 respectively;

[0048] The second through hole 13 is opened on the mounting block 2, and the two second through holes 13 are coaxially arranged.

[0049] The mounting rod 3 is inserted into the two second through holes 13. Both ends of the mounting rod 3 protrude from the two second through holes 13 and are threadedly connected to the first nut 4. The inclined plate 9 is rotatably connected to the mounting rod 3.

[0050] The scheme is further optimized so that the inclined plate 9 is located between the two mounting blocks 2, and a third through hole 16 is opened on the inclined plate 9. The mounting rod 3 passes through the third through hole 16 and is rotatably connected to the third through hole 16.

[0051] The design has been further optimized. The positioning mechanism includes an adjustment section and a fixing section. The adjustment section includes:

[0052] The first through hole 7 vertically penetrates the base 1;

[0053] The movable support rod 8 is vertically slidably connected in the first through hole 7, and both ends of the movable support rod 8 protrude out of the first through hole 7;

[0054] Connecting rod 12 is coaxially fixed to the top of movable support rod 8;

[0055] The slider 11 is fixed to the top of the connecting rod 12 and is slidably connected in the groove 10, which is opened on the bottom surface of the inclined plate 9.

[0056] The design has been further optimized, and the fixing part includes:

[0057] A threaded hole 5 is provided on one side of the base 1 and communicates with the first through hole 7;

[0058] Screw 6 is threaded into threaded hole 5, and one end of screw 6 extends into first through hole 7 and abuts against movable support rod 8.

[0059] The scheme is further optimized so that when the inclined plate 9 is in a horizontal state, the top surface of the base 1 is in contact with the bottom surface of the inclined plate 9.

[0060] To further optimize the design, a first scale is provided on the outer wall of the movable support rod 8.

[0061] The zero mark of the first scale is flush with the bottom surface of the inclined plate 9.

[0062] The scheme was further optimized by bonding the cement mortar matrix 14 to the inclined plate 9 with epoxy resin.

[0063] Specific usage instructions:

[0064] One end of the inclined plate 9 with the third through hole 16 is placed between the two mounting blocks 2. The mounting rod 3 passes through the two second through holes 13 and the third through hole 16. Both ends of the mounting rod 3 pass through the second through hole 13 and are threadedly connected to the first nut 4.

[0065] A movable support rod 8 is vertically slidably connected in the first through hole 7 on the base 1. One side of the movable support rod 8 is set as a plane. A screw 6 is threadedly connected in the threaded hole 5 on one side of the base 1. One end of the screw 6 extends into the first through hole 7 and abuts against the plane on one side of the movable support rod 8. A first scale is opened on the movable support rod 8. A connecting rod 12 is coaxially fixed to the top of the movable support rod 8. A slider 11 is fixed to the top of the connecting rod 12. The axis of the connecting rod 12 passes through the center of the slider 11. The slider 11 is slidably connected in the sliding groove 10. The sliding groove 10 is opened on the ground of the inclined plate 9 and is set along the length direction of the inclined plate 9. The sliding groove 10 is perpendicular to the mounting rod 3. A cement mortar matrix 14 with polymer fiber 15 embedded inside is fixed to the top surface of the inclined plate 9 by epoxy resin adhesive.

[0066] When in use, loosen screw 6. At this time, the movable support rod 8 can be adjusted up and down. Adjust the tilt angle of the tilt plate 9 by moving the support rod 8. When adjusted to the required position for the test, tighten screw 6 to perform a pull-out test on the polymer fiber 15.

[0067] Let L be the distance between the axis of the movable support rod 8 and the axis of the mounting rod 3, and H be the height of the movable support rod 8. Then the tilt angle of the inclined plate 9 is arctanH / L.

[0068] Example 2

[0069] Reference Figure 4 The difference from Embodiment 1 is that, in this embodiment, a slide rail 17 is provided on the inclined plate 9, the connecting rod 12 is slidably connected in the slide rail 17, the connecting rod 12 is provided with external threads, and a second nut 19 is threadedly connected to the connecting rod 12. The second nut 19 is located on the ground of the inclined plate 9. The top end of the connecting rod 12 passes through the top surface of the inclined plate 9 and is fixedly connected to a sliding ball 11. The sliding ball 11 is spherically hinged in a ball hinge block 18. A through groove is provided on the ball hinge block 18, and the connecting rod 12 is slidably connected in the through groove. The ball hinge block 18 is in sliding contact with the top surface of the inclined plate 9, and the cement mortar matrix 14 is fixedly connected to the side of the ball hinge block 18 away from the inclined plate 9.

[0070] This design changes the connection method between the inclined plate 9 and the connecting rod 12, eliminating the need to create a complex groove 10 on the inclined plate 9, making it easier to manufacture.

[0071] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0072] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An arbitrary angle adjustable polymer fiber filament drawing test device, characterized by, The utility model provides a kind of adjustable inclined plate, including: Base (1); Inclined plate (9), with the base (1) hinged; Adjusting positioning mechanism, be arranged between the base (1) and the inclined plate (9), for adjusting and fixing the angle of the inclined plate (9); Cement mortar matrix (14) with polymer fiber (15) embedded in the inside, is fixedly connected in the side of the inclined plate (9) away from the base (1); The adjusting positioning mechanism includes adjusting part and fixed part, the adjusting part includes: First through-hole (7), vertically through the base (1); Mobile support rod (8), vertical sliding connection is established in the first through-hole (7), both ends of the mobile support rod (8) are out of the first through-hole (7); Connecting rod (12), coaxial fixed connection is established in the top end of the mobile support rod (8); Slide (17) is set on the inclined plate (9), connecting rod (12) is slidingly connected in slide (17), external thread is set on connecting rod (12), second nut (19) is threadedly connected on connecting rod (12), second nut (19) is located on the bottom surface of inclined plate (9), the top end of connecting rod (12) is out of the top surface of inclined plate (9) and is fixedly connected with slide ball (11), slide ball (11) is hingedly connected in ball hinge block (18), through slot is set on ball hinge block (18), connecting rod (12) is slidingly connected in through slot, ball hinge block (18) and the top surface of inclined plate (9) sliding contact, cement mortar matrix (14) is fixedly connected in the side of ball hinge block (18) away from inclined plate (9); The fixed part includes: Threaded hole (5), set on the side of the base (1) and communicated with the first through-hole (7); Screw (6), threadedly connected in the threaded hole (5), one end of the screw (6) is inserted into the first through-hole (7) and abuts with the mobile support rod (8); When the inclined plate (9) is in horizontal state, the top surface of the base (1) is attached with the bottom surface of the inclined plate (9).

2. The adjustable angle polymer fiber filament pull-out test device of claim 1, wherein, One side of the base (1) is provided with a connecting portion, and the connecting portion comprises: Two mounting blocks (2) are fixedly connected to one end of the base (1), and the two mounting blocks (2) are respectively located on the two sides of the base (1); Second through-hole (13) is set on the mounting block (2), and the two second through-holes (13) are coaxially arranged; Mounting rod (3) is arranged in the two second through-holes (13), and the two ends of the mounting rod (3) are out of the two second through-holes (13) and are threadedly connected with the first nut (4), and the inclined plate (9) is rotatably connected with the mounting rod (3).

3. The adjustable angle polymer fiber filament pull-out test device of claim 2, wherein, The inclined plate (9) is located between the two mounting blocks (2), and the third through-hole (16) is set on the inclined plate (9), and the mounting rod (3) is arranged in the third through-hole (16) and is rotatably connected with the third through-hole (16).

4. The adjustable angle polymer fiber filament pull-out test device of claim 1, wherein, First scale is set on the outer side wall of the mobile support rod (8).

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