A device for preventing torsion and shearing of soft material specimens

Abstract

The present invention provides a device for preventing a soft material sample from twisting and shearing. The device is composed of an upper clamping ring (1), a lower clamping ring (2), an upper L-shaped chute (3), a lower L-shaped chute (4), and a vertical slider (5). The upper clamping ring (1) and the lower clamping ring (2) have the same upper and lower structures, and the upper L-shaped chute (3) and the lower L-shaped chute (4) have the same upper and lower structures. The chute are connected by a vertical slider (5). The present invention has a simple structure and is easy to operate. It can effectively solve the problem of sample twisting and breaking during a tensile test of soft materials, ensure that soft samples such as composite fibers break in the vertical direction, and improve the accuracy of the tensile test of soft samples.

Description

Technical Field

[0001] The invention belongs to the field of mechanical testing equipment protection, and in particular relates to a device for preventing a soft material sample from being twisted and sheared. Background Art

[0002] Tensile testing is one of the basic methods for testing the mechanical properties of materials. The material strength and plasticity data obtained from the tensile test have important application value and reference value for design and material selection, new material development, material procurement and acceptance, etc. When using a universal testing machine for tensile testing, a punched fixture is often used. There are two ways to assemble the specimen with the punched fixture, which has the following characteristics:

[0003] The first method involves punching a hole in the specimen, aligning the hole in the specimen with the existing hole in the fixture, securing the fixture and specimen with a nut, and finally mounting the fixture and specimen on the testing machine for testing. However, uneven tightening force during the process can cause the soft material to break, twist, or fracture. Furthermore, during the process of mounting the fixture and specimen on the testing machine for testing, human factors can easily cause uneven force on the soft specimen, leading to twisting or fracture.

[0004] The second method involves first punching a hole in the specimen, then securing the fixture to the testing machine. The machine is then started to adjust the fixture's height so that the specimen hole aligns with the fixture's hole, and finally, the fixture and specimen are secured with a nut. However, in order to accurately adjust the fixture's height and align the specimen hole with the fixture's hole, the tester's switch must be frequently activated, which can cause significant damage to the machine.

[0005] Conventional punch-type fixtures have low assembly efficiency, high equipment loss, and can also affect specimen quality, reducing the accuracy of test data. Therefore, adding an anti-twist device to protect the test specimen during tensile testing of soft materials can ensure normal test progress, improve test accuracy, and increase experimental efficiency, with broad application prospects. Summary of the Invention

[0006] The present invention proposes a device for preventing twisting and shearing of soft material samples. The device has a simple structure and is easy to operate. It can effectively solve the phenomenon of sample twisting and breaking during the tensile test of soft materials, ensure that soft samples such as composite fibers break in the vertical direction, and improve the accuracy of the tensile test of soft samples.

[0007] The device for preventing a soft material sample from twisting and shearing comprises an upper clamping ring (1), a lower clamping ring (2), an upper L-shaped chute (3), a lower L-shaped chute (4), and a vertical slider (5). The upper clamping ring (1) and the lower clamping ring (2) have the same upper and lower structures, and the upper L-shaped chute (3) and the lower L-shaped chute (4) have the same upper and lower structures. The chute are connected by a vertical slider (5).

[0008] The clamping ring comprises an arc-shaped boss and a T-shaped slot, wherein the arc-shaped boss has an arc-shaped through hole, and both sides of the T-shaped slot have through holes with threads.

[0009] The right arc-shaped boss on the clamping ring is provided with an annular streamer, and the back side of the boss in the vertical direction is provided with a through threaded hole which is connected with the right arc-shaped through hole.

[0010] The upper L-shaped chute (3) comprises a plurality of upper left L-shaped chute and an upper right L-shaped chute, wherein the chute is an "I"-shaped chute in the horizontal direction and an "I"-shaped chute in the vertical direction, and the vertical direction is a boss with a screw hole.

[0011] The vertical slider (5) comprises a left vertical slider and a right vertical slider, and bosses are provided at both ends of the vertical slider.

[0012] The material of the device can be any common material including low carbon steel, medium carbon steel, stainless steel, aluminum and its alloys, magnesium and its alloys, zinc and its alloys, titanium and its alloys, graphite and carbon fiber.

[0013] The device of the present invention is composed of an upper clamping ring (1), a lower clamping ring (2), an upper L-shaped chute (3), a lower L-shaped chute (4), and a vertical slider (5). The device can effectively protect the fixing process of the sample and the fixture, solve the phenomenon of sample distortion and breakage during material tensile testing, ensure that soft samples such as composite fibers break in the vertical direction, and thus effectively improve the accuracy of the tensile test of soft samples. The device has a simple structure, is easy to install and operate, can be tested repeatedly, and has high feasibility; the device is low in cost, easy to mass-produce, safe and environmentally friendly, and has high engineering application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings that constitute the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the combined structure of a device for preventing torsion and shearing of a soft material sample according to an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the disassembled structure of a device for preventing torsion and shearing of a soft material sample according to an embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of the upper retaining ring structure of a device for preventing twisting and shearing of soft material samples according to an embodiment of the present invention.

[0018] Figure 4 The figure is a schematic diagram of the working structure of a device for preventing torsion and shearing of a soft material sample according to an embodiment of the present invention.

[0019] Among them, (11) is a left snap ring, (12) is an annular ribbon, (13) is a right snap ring, (111) is a left arc-shaped boss, (112) is a left arc-shaped through hole, (113) is a left T-shaped slide, (121) is a right arc-shaped boss, (122) is a right arc-shaped through hole, (123) is a right T-shaped slide, and (124) is a through threaded hole. DETAILED DESCRIPTION

[0020] The present invention is further described below with reference to the examples. The raw materials used in the examples are all commercially available, the equipment used is conventional experimental equipment, and all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. This example is implemented under the premise of the technical solution of the present invention, and provides a specific operation process and a specific implementation scheme. It should be noted that the scope of protection of the present invention is not limited to the following examples.

[0021] The invention provides a device for preventing a soft material sample from twisting and shearing.

[0022] The device is composed of an upper clamping ring (1), a lower clamping ring (2), an upper L-shaped chute (3), a lower L-shaped chute (4), and a vertical slider (5). The upper clamping ring (1) and the lower clamping ring (2) have the same upper and lower structures, and the upper L-shaped chute (3) and the lower L-shaped chute (4) have the same upper and lower structures. The chute are connected by the vertical slider (5).

[0023] The snap ring (11) comprises an arc-shaped boss (111) and a T-shaped slot (113), wherein the arc-shaped boss has an arc-shaped through hole (112), and both sides of the T-shaped slot (113) have through holes with threads.

[0024] The right arc-shaped boss (121) on the clamping ring is provided with an annular streamer (12), and a through threaded hole (124) is provided on the back side of the boss (121) in the vertical direction, which is connected with the right arc-shaped through hole (122).

[0025] The upper L-shaped chute (3) comprises a plurality of upper left L-shaped chute and an upper right L-shaped chute, wherein the chute is an "I"-shaped chute in the horizontal direction and an "I"-shaped chute in the vertical direction, and the vertical direction is a boss with a screw hole.

[0026] The vertical slider 5 includes a left vertical slider and a right vertical slider, and bosses are provided at both ends of the vertical slider.

[0027] The material of the device can be any common material including low carbon steel, medium carbon steel, stainless steel, aluminum and its alloys, magnesium and its alloys, zinc and its alloys, titanium and its alloys, graphite and carbon fiber.

[0028] First, place the sample on the upper and lower L-shaped slides, then fix the vertical slider with nuts, then fix the sample and the fixture with nuts, then fix the fixture with the annular ribbons 12 of the upper and lower clamps, and then assemble the fixture into the tensile machine.

[0029] The upper clamping ring (1) and the lower clamping ring (2) are used to clamp fixtures and chucks of different sizes through the annular ribbons (12) thereon, so that the device, the fixture and the chuck become a whole, thereby making the device, the sample, the fixture and the chuck on the same central axis, ensuring that the sample breaks in the vertical direction. The T-shaped slides of the upper and lower clamping rings slide on the "I"-shaped slides of the upper and lower L-shaped, so as to fix fixtures of different sizes.

[0030] The upper L-shaped chute (3) and the lower L-shaped chute (4) are used to clamp the specimen to prevent the specimen from twisting or breaking during assembly; during testing, the specimen can be ensured to break in the vertical direction. The upper clamping ring (1), the lower clamping ring (2) and the vertical chute are connected. The nuts behind the upper and lower L-shaped chute can control the movement of the vertical slider in the chute behind them, thereby accommodating specimens of different lengths.

[0031] The vertical slider (5) is used to connect the upper L-shaped chute (3) and the lower L-shaped chute (4), and the length of the bracket can be freely adjusted to adapt to samples of different lengths. During the experiment, the L-shaped chute fixes the sample through the slider while ensuring synchronous displacement with the fixture and the chuck.

[0032] like Figure 4 As shown, this device secures the test specimen to the testing machine's fixture. The upper half of the fixture is secured to the specimen's A end, while the lower half is secured to the specimen's B end. This allows the device, specimen, and fixture to be installed as a single unit on the tensile testing machine. This prevents the specimen from twisting or breaking during installation and ensures that the specimen breaks vertically during testing.

[0033] Before starting the testing machine, slightly loosen the through nuts on the upper right arc-shaped boss and the lower right arc-shaped boss before testing. The sample assembly operation includes the following steps:

[0034] 1. Assemble the entire device into five parts: an upper snap ring (1), a lower snap ring (2), an upper L-shaped slide (3), a lower L-shaped slide (4), and a vertical slide (5);

[0035] 2. Adjust the length of the vertical slider (5) in the upper L-shaped chute (3) and the lower L-shaped chute (4) so ​​that the working area and arc transition area of ​​the specimen are in the center of the vertical slider, and then tighten the nuts on the upper and lower L-shaped chute bosses to fix the specimen;

[0036] 3. First, slide the upper and lower clamping rings into the upper and lower L-shaped slots to align the circular holes of the test machine fixture with the circular holes of the specimen; then, pass the annular streamers (12) on the upper and lower clamping rings through the upper and lower left arc-shaped through holes and the upper and lower right arc-shaped through holes in sequence to tighten the test machine fixture; then, use nuts to pass through the threaded holes on the back of the upper and lower arc-shaped bosses to fix the annular streamers (12); finally, tighten the nuts on both sides of the T-shaped slots of the upper and lower clamping rings to make the device, specimen, and fixture become a whole;

[0037] 4. Install the fixture on the testing machine, and then slightly loosen the nuts on the back of the upper and lower arc-shaped bosses and the nuts on the upper and lower L-shaped slide bosses to ensure that the composite fiber soft material breaks in the vertical direction, reduce the friction between the sample and the device in the vertical direction, and improve the accuracy of the test results.

[0038] After completing the above steps, perform a tensile test, remove the device after completion, and repeat steps 2-4 to perform a tensile test on the next sample.

[0039] The above example is only an embodiment of the present invention and should not be understood as limiting the present invention. Any simple modifications, equivalent changes and modifications made to the above implementation methods within the spirit and principles of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A device for preventing a soft material sample from being twisted and sheared, the device comprising an upper clamping ring (1), a lower clamping ring (2), an upper L-shaped slide groove (3), a lower L-shaped slide groove (4), and a vertical slider (5), wherein the clamping ring comprises an arc-shaped boss and a T-shaped slide groove, wherein the arc-shaped boss has an arc-shaped through hole, and the T-shaped slide groove has through holes with threads on both sides, the upper clamping ring (1) and the lower clamping ring (2) have the same upper and lower structures, the upper L-shaped slide groove (3) and the lower L-shaped slide groove (4) have the same upper and lower structures, and the slide grooves are connected by a vertical slider (5), the right arc-shaped boss on the clamping ring has an annular streamer, and the back of the boss has a through threaded hole in the vertical direction, which is connected to the right arc-shaped through hole; the upper L-shaped slide groove (3) comprises a plurality of upper left L-shaped slide grooves and an upper right L-shaped slide groove, the horizontal direction of the slide groove is an "I"-shaped slide groove, the vertical direction is an "I"-shaped slide groove, and the vertical direction is a boss with a screw hole.

2. The device for preventing torsion and shearing of a soft material sample according to claim 1, characterized in that: The vertical slider (5) comprises a left vertical slider and a right vertical slider, and bosses are provided at both ends of the vertical slider.

3. The device for preventing torsion and shearing of a soft material sample according to claim 1, characterized in that: The material of the device can be any common material including low carbon steel, medium carbon steel, stainless steel, aluminum and its alloys, magnesium and its alloys, zinc and its alloys, titanium and its alloys, graphite and carbon fiber.

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