Tensile test clamp for sheet-shaped composite material sample

Abstract

The utility model relates to the technical field of clamp processing, and in particular relates to a tensile test clamp for a sheet-shaped composite material sample. Which comprises a clamp body and is characterized in that the clamp body comprises a carbon fiber sample, two sets of clamp assemblies are arranged at the two ends of the carbon fiber sample correspondingly with the carbon fiber sample as a center boundary, each clamp assembly comprises a top bolt, and one end of each top bolt is connected with a second side plate; one side of the second side plate is provided with a middle plate, the middle plate is associated with a carbon fiber sample, and the center of the carbon fiber sample is provided with an internal bolt; through the clamp assembly and a precise connection mode, the clamp can ensure that a carbon fiber sample is subjected to uniform and consistent force in the stretching process, so that the accuracy of a test result is improved; the magnetic adsorption and quick connection design simplifies the mounting and removing process of the sample, so that an operator can quickly and effectively replace the sample, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fixture processing, in particular to a composite material sheet sample tensile test fixture. Background Art

[0002] In the performance testing of composite materials, tensile testing is a key evaluation method used to determine parameters such as material strength, ductility, and elastic modulus. Traditional tensile test fixtures are usually designed for metal or plastic materials and are not sufficient to cope with the challenges unique to composite materials, such as the non-homogeneity and anisotropy of carbon fiber specimens. These characteristics require that the fixture must provide more uniform force distribution and more precise centering capabilities to avoid inaccurate data or damage to the specimen during the test. Therefore, there is a need to develop a tensile test fixture designed specifically for composite materials to provide more accurate and repeatable test results.

[0003] A Chinese patent discloses a tensile test fixture (publication number: CN 201653796 U), which is characterized by: comprising an upper and lower clamp body, both of which are symmetrical two-half structures, and the half-body mating parts are respectively provided with cavities for accommodating the bolt head and the connecting plate of the bolt welding after being enclosed, and the two cavities extend toward each other with openings for accommodating the connecting rod of the bolt welding, and the diameters of the openings are respectively smaller than the inner diameters of the cavities, and the ends opposite to the openings are each provided with a clamping rod for clamping the test equipment, but this tensile test fixture is usually designed for metal or plastic materials, and is not sufficient to cope with the challenges unique to composite materials, such as the heterogeneity and anisotropy of carbon fiber specimens. These characteristics require that the fixture must provide more uniform force distribution and more precise centering capabilities to avoid inaccurate data or damage to the specimen during the test, so a composite sheet specimen tensile test fixture is needed. Utility Model Content

[0004] The purpose of the utility model is to solve the existing problems in the prior art that the existing tensile test fixtures are usually designed for metal or plastic materials and are not sufficient to cope with the challenges unique to composite materials, such as the heterogeneity and anisotropy of carbon fiber specimens. These characteristics require the fixture to provide more uniform force distribution and more precise centering capabilities to avoid inaccurate data or damage to the specimen during the test, and a composite sheet specimen tensile test fixture is proposed.

[0005] The technical solution adopted by the utility model to solve its technical problems is: the utility model describes a composite sheet specimen tensile test fixture, including a fixture body, characterized in that: the fixture body includes a carbon fiber specimen, both ends of the carbon fiber specimen are provided with fixture assemblies, the number of the fixture assemblies is 2 groups and they are arranged correspondingly with the carbon fiber specimen as the center dividing line, the fixture assembly includes a top bolt, one end of the top bolt is connected to a second side plate, one side of the second side plate is provided with a middle plate, the middle plate is associated with the carbon fiber specimen, and the center of the carbon fiber specimen is provided with an internal bolt.

[0006] Preferably, an M12 nut is provided at the connection between the top bolt and the second side plate, an M22×1.5 fine pitch round nut is provided on one side of the M12 nut, and an M22×1.5 fine pitch round nut is installed next to the M12 nut, which provides a larger area of ​​thread contact, thereby reducing the risk of bolt loosening and improving the overall mechanical properties.

[0007] Preferably, one end of the internal bolt passes through the carbon fiber sample, the middle plate and the second side plate and an M10 nut is installed at the connection with the second side plate, and the other end is connected to the first side plate and an M10 nut is installed at the connection, and the number of M10 nuts is 4. One end of the internal bolt is connected to the first side plate, and the other end is fixed to the second side plate with two M10 nuts. This configuration ensures the stability of the sample during the stretching process and prevents any possible movement or rotation.

[0008] Preferably, the top bolts and the internal bolts are both made of high-strength alloy steel, which can ensure that the bolts will not be deformed or broken due to excessive force during a long-term tensile test.

[0009] Preferably, tightening springs are provided on both sides of the center of the internal bolt, and the tightening springs are made of stainless steel. These springs provide uniform pressure during the stretching process of the sample, ensure the stability of the sample during the test, and prevent damage to the sample due to uneven loading.

[0010] Preferably, the connection between the top bolt and the side panel adopts a wedge structure, and the connection between the carbon fiber sample and the middle plate adopts a magnetic adsorption method. The connection between the top bolt and the side plate utilizes a wedge structure to achieve a self-locking function, thereby improving the stability and vibration resistance of the connection. At the same time, the connection between the carbon fiber sample and the middle plate uses a magnetic adsorption method, which is convenient for the rapid positioning and replacement of the sample, and significantly improves the convenience and efficiency of operation.

[0011] The utility model is beneficial in that:

[0012] The utility model uses a clamp assembly and a precise connection method to ensure that the carbon fiber specimen is subjected to uniform and consistent force during the stretching process, thereby improving the accuracy of the test results; the magnetic adsorption and quick connection design simplifies the installation and removal process of the specimen, allowing the operator to quickly and effectively replace the specimen, thereby improving work efficiency; the use of high-strength alloy steel bolts and wedge-shaped structure connections increases the overall stability and durability of the clamp, especially under long-term use and high-frequency vibration environments; the design of the fastening spring ensures that the specimen is subjected to uniform pressure during the stretching process, avoiding specimen damage due to uneven loading, thereby protecting the integrity of the specimen; the design of the clamp takes into account composite material specimens of different specifications and sizes, making it more widely applicable and able to meet diverse testing needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a partial structural schematic diagram of the utility model.

[0016] In the figure: 1. Top bolt; 2. M22×1.5 fine pitch round nut; 3. M12 nut; 4. Second side plate; 5. Internal bolt; 6. Carbon fiber specimen; 7. Middle plate; 8. First side plate; 9. M10 nut. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Example

[0019] See also Figure 1-2As shown, a composite sheet specimen tensile test fixture includes a fixture body, characterized in that: the fixture body includes a carbon fiber specimen 6, both ends of the carbon fiber specimen 6 are provided with fixture assemblies, the number of the fixture assemblies is 2 groups and they are arranged correspondingly with the carbon fiber specimen 6 as the center dividing line, the fixture assembly includes a top bolt 1, one end of the top bolt 1 is connected to a second side plate 4, one side of the second side plate 4 is provided with a middle plate 7, the middle plate 7 is associated with the carbon fiber specimen 6, and the center of the carbon fiber specimen 6 is provided with an internal bolt 5.

[0020] In this embodiment, an M12 nut 3 is provided at the connection between the top bolt 1 and the second side plate 4, and an M22×1.5 fine pitch round nut 2 is provided on one side of the M12 nut 3. An M22×1.5 fine pitch round nut 2 is installed next to the M12 nut 3, which provides a larger area of ​​thread contact, thereby reducing the risk of bolt loosening and improving the overall mechanical properties.

[0021] In this embodiment, one end of the internal bolt 5 passes through the carbon fiber sample 6, the middle plate 7 and the second side plate 4, and an M10 nut 9 is installed at the connection with the second side plate 4, and the other end is connected to the first side plate 8 and an M10 nut 9 is installed at the connection. The number of M10 nuts 9 is 4. One end of the internal bolt 5 is connected to the first side plate 8, and the other end is fixed to the second side plate 4 with two M10 nuts 9. This configuration ensures the stability of the sample during the stretching process and prevents any possible movement or rotation.

[0022] In this embodiment, the top bolt 1 and the internal bolt 5 are both made of high-strength alloy steel, which is a common product on the market and can be purchased directly. This can ensure that during a long-term tensile test, the bolt will not be deformed or broken due to excessive force.

[0023] In this embodiment, tightening springs are provided on both sides of the center of the internal bolt 5. The tightening springs are made of stainless steel. These springs provide uniform pressure during the stretching process of the sample, ensure the stability of the sample during the test, and prevent damage to the sample due to uneven loading.

[0024] In this embodiment, the connection between the top bolt 1 and the side panel adopts a wedge structure, and the connection between the carbon fiber sample 6 and the middle plate 7 adopts a magnetic adsorption method. The connection between the top bolt 1 and the side plate utilizes a wedge structure to achieve a self-locking function, thereby improving the stability and vibration resistance of the connection. At the same time, the connection between the carbon fiber sample 6 and the middle plate 7 uses a magnetic adsorption method, which is convenient for the rapid positioning and replacement of the sample, and significantly improves the convenience and efficiency of operation.

[0025] The implementation principle of this embodiment is as follows: first, the carbon fiber sample 6 is fixed on the middle plate 7, the internal bolt 5 passes through the center of the sample, and the two ends are respectively connected to the first side plate 8 and the second side plate 4, and the M10 nut 9 screws the first side plate 8 and the second side plate 4 at both ends. The fastening springs located on both sides of the internal bolt 5 provide a constant pressure, and the wedge-shaped structure connection between the top bolt 1 and the side plate provides a self-locking function. The top bolt 1 is fixed to the second side plate 4 by the M12 nut 3 and the M22×1.5 fine-pitch round nut 2.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A composite sheet specimen tensile test fixture, comprising a fixture body, characterized in that: The clamp body comprises a carbon fiber sample (6), and clamp assemblies are arranged at both ends of the carbon fiber sample (6). The number of the clamp assemblies is 2 and they are arranged correspondingly with the carbon fiber sample (6) as the center dividing line. The clamp assembly comprises a top bolt (1), one end of the top bolt (1) is connected to a second side plate (4), one side of the second side plate (4) is provided with a middle plate (7), the middle plate (7) is associated with the carbon fiber sample (6), and an internal bolt (5) is arranged at the center of the carbon fiber sample (6).

2. A composite sheet specimen tensile test fixture according to claim 1, characterized in that: An M12 nut (3) is provided at the connection between the top bolt (1) and the second side plate (4), and an M22×1.5 fine-pitch round nut (2) is provided on one side of the M12 nut (3).

3. A composite sheet specimen tensile test fixture according to claim 1, characterized in that: One end of the internal bolt (5) passes through the carbon fiber sample (6), the middle plate (7) and the second side plate (4) and an M10 nut (9) is installed at the connection with the second side plate (4), and the other end is connected to the first side plate (8) and an M10 nut (9) is installed at the connection, and the number of the M10 nuts (9) is 4.

4. A composite sheet specimen tensile test fixture according to claim 1, characterized in that: The top bolt (1) and the internal bolt (5) are both made of high-strength alloy steel.

5. A composite sheet specimen tensile test fixture according to claim 1, characterized in that: Fastening springs are provided on both sides of the center of the internal bolt (5), and the fastening springs are made of stainless steel.

6. A composite sheet specimen tensile test fixture according to claim 1, characterized in that: The connection between the top bolt (1) and the side plate adopts a wedge structure, and the connection between the carbon fiber sample (6) and the middle plate (7) adopts a magnetic adsorption method.

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