Flexible fabric sample piece pre-tightening force loading and clamping device based on light-gas gun impact system

Abstract

The invention provides a flexible fabric sample piece pre-tightening force loading and clamping device based on a light-gas gun impact system. Relates to the technical field of impact test equipment, in particular to a flexible fabric sample piece pre-tightening force loading and clamping device based on a light gas gun impact system, which comprises a base, a sample piece fabric piece clamping assembly and a pre-tightening force loading assembly, the pre-tightening force loading assemblies are installed on the periphery of the base, the multiple pre-tightening force loading assemblies are all connected with the sample piece fabric piece clamping assembly, and rigid support is provided for the device through the base. The flexible fabric sample piece pre-tightening force loading and clamping device based on the light-gas gun impact system has the advantages of being convenient to use, loading in-plane double-shaft pre-tightening force of the fabric sample piece and carrying out high-speed impact tests on the fabric sample piece in different pre-tightening force states.

Description

Technical Field

[0001] The present invention relates to the technical field of impact test equipment, and particularly relates to a pre-tensioned flexible fabric specimen impact experiment device. Background Art

[0002] In the dynamic mechanical property testing of materials and structures, impact experiments based on light gas guns have always been one of the important testing methods. Through bullet impact experiments at different speeds, the ballistic limit and failure mechanism of materials and structures under high-speed impact are studied. Nowadays, high-performance fiber fabric specimens are widely used, including scenarios such as airship skins and pressure vessel linings. Due to reasons such as gas pressure and structural deformation, the flexible fabric specimen materials used in structures are always in a tensioned state. Existing research shows that the impact resistance of a unidirectionally pre-stretched fabric specimen changes with the magnitude of the pre-tension force. To further explore the change law of the impact resistance of fabric specimens under the state of biaxial pre-tension force, corresponding impact tests need to be carried out.

[0003] However, the existing fabric specimen clamping devices lack the loading of biaxial pre-tension force on the fabric. In the Chinese invention patent with the publication number CN113432970A, a clamping device for clamping flexible fabric specimen materials is proposed. It clamps the fabric specimen through a combined pressure plate with concave-convex engagement, and applies pre-tension force to the fabric specimen by turning a screw rod to pull the boundary of the fabric specimen. However, the clamping device described in this patent can only apply unidirectional pre-tension force, and lacks a force sensor to feedback the magnitude of the applied pre-tension force, resulting in incomplete detection and certain defects.

[0004] Therefore, it is necessary to provide a pre-tension force loading and clamping device for flexible fabric specimens based on a light gas gun impact system to solve the above technical problems.

[0005] Practical Invention Content

[0006] The technical problem solved by the present invention is to provide a pre-tension force loading and clamping device for flexible fabric specimens based on a light gas gun impact system, which is convenient to use, can load the in-plane biaxial pre-tension force on the fabric specimen, and can perform high-speed impact tests on the fabric specimen under different pre-tension force states.

[0007] To solve the above technical problems, the pre-tension force loading and clamping device for flexible fabric specimens based on a light gas gun impact system provided by the present invention is composed of a base, a specimen fabric clamping component, and a pre-tension force loading component. The specimen fabric clamping component is installed at the cross groove in the center of the base, and the pre-tension force loading component is installed around the base. A plurality of the pre-tension force loading components are all connected to the specimen fabric clamping component, providing rigid support for the device through the base, loading the biaxial pre-tension force on the fabric specimen through the pre-tension force loading component, and stably clamping the fabric specimen through the specimen fabric clamping component.

[0008] Preferably, the base is composed of a square bottom plate, four limiting blocks and four bottom plate edges. The four limiting blocks and the four bottom plate edges are connected to the square bottom plate by a plurality of M8 bolts. The four bottom plate edges are installed on the four sides of the square bottom plate, and the four limiting blocks are respectively installed at the four corners of the square bottom plate.

[0009] Preferably, the sample fabric clamping assembly is composed of a thorn plate, a hole plate, fixing bolts and a C-shaped frame. A plurality of nail thorns are arranged at intervals on the thorn plate, a plurality of through round holes for accommodating the nail thorns are arranged at intervals on the hole plate, and a plurality of M10 bolt holes are arranged on the C-shaped frame.

[0010] Preferably, the pre-tightening force loading assembly is composed of a pre-tightening force loading bolt, a ring force sensor and a ring bearing. The pre-tightening force loading bolt passes through the ring force sensor or the ring bearing and a round hole on the bottom plate edge, and is screwed into a reserved threaded hole on the C-shaped frame to connect the fabric sample, the fabric clamping assembly and the pre-tightening force loading assembly.

[0011] Preferably, a square hole is provided in the middle of the square bottom plate for the bullet to impact or the high-speed camera to photograph the deformation of the sample.

[0012] Preferably, a 10-mm round hole is provided on the bottom plate edge for the pre-tightening force loading assembly to pass through and connect with the fabric clamping assembly.

[0013] Preferably, a plurality of the M bolt holes are a-surface bolt holes, b-surface bolt holes and C-surface bolt holes respectively opened on three sides of the C-shaped frame. The a-surface bolt holes and the C-surface bolt holes are used for screwing in fixing bolts to tightly press and fix the thorn plate and the hole plate inserted into the C-shaped frame, and the b-surface bolt holes are used for connecting with the pre-tightening force loading assembly.

[0014] Preferably, the ring force sensor is a bridge circuit sensor.

[0015] Preferably, two groups of the pre-tightening force loading assemblies are installed on each side of the base. On the bottom plate edges in the same direction, one side of the bottom plate edge is a combination of a force sensor and a pre-tightening force loading bolt, and the other side of the bottom plate edge is a combination of a bearing and a pre-tightening force loading bolt.

[0016] Compared with the related technology, the flexible fabric sample pre-tightening force loading and clamping device based on the light gas gun impact system provided by the present invention has the following beneficial effects:

[0017] The device realizes mechanical biting on the clamping area of the fabric sample by arranging multiple rows of barbs, and provides additional friction by pressing the fabric sample and the perforated plate of the barb plate with bolts, ensuring the stable clamping of the fabric sample by the device; on the premise that the fabric sample is closely connected to the device, by means of the reserved threaded holes in the fabric sample clamping assembly, the fabric sample is pulled by tightening the bolts to apply a biaxial pre-tightening force to the fabric sample; with the help of the force sensor, the magnitudes of the pre-tightening forces received by the fabric sample in two directions are measured to accurately apply the pre-tightening force, providing accurate parameters for establishing the quantitative relationship between the pre-tightening force state and the impact resistance performance of the fabric sample. Description of the Drawings

[0018] Figure 1 is the overall assembly schematic diagram of the clamping device of the present invention;

[0019] Figure 2 is the schematic diagram of the base 1;

[0020] Figure 3 is the schematic diagram of the square base plate;

[0021] Figure 4 is the schematic diagram of the edge of the base plate;

[0022] Figure 5 is the schematic diagram of the limit block;

[0023] Figure 6 is the schematic diagram of the fabric sample 10 and the fabric sample clamping assembly 2;

[0024] Figure 7 is the schematic diagram of the barb plate 6 and the perforated plate 7;

[0025] Figure 8 is the schematic diagram of the C-shaped frame;

[0026] Figure 9 is the schematic diagram of the fixing bolt 9;

[0027] Figure 10 is the schematic diagram of the pre-tightening force loading bolt 11;

[0028] Figure 11 is the schematic diagram of the force sensor 12;

[0029] Figure 12 is the schematic diagram of the bearing 13;

[0030] Figure 13 is the schematic diagram of the fabric sample test piece 10.

[0031] 1. Base; 2. Fabric piece clamping assembly; 3. Square base plate; 4. Base plate edge; 5. Limit block; 6. Prickly plate; 7. Perforated plate; 8. C-shaped frame; 9. Fixed bolt; 10. Fabric sample; 11. Pre-tightening force loading bolt; 12. Force sensor; 13. Bearing. Detailed implementation mode

[0032] The present invention will be further described below in conjunction with the accompanying drawings and the implementation mode.

[0033] Figure 1 It is a schematic diagram of the overall structure assembly of the clamping device. This clamping device consists of a base 1, a sample fabric piece clamping assembly 2, and a pre-tightening force loading assembly. The base 1 is composed of a square base plate 3, four limit blocks 5, and four base plate edges 4. By screwing the bolts into the back of the square base plate 3, the base plate edges 4 and the limit blocks 5 are fixed at the four sides and four corners of the square base plate 3 to form a complete base. A square hole is provided in the middle of the square base plate 3 for the bullet to impact or the high-speed camera to photograph the deformation of the sample. A 10-mm round hole is provided on the base plate edge 4 for the pre-tightening force loading assembly to pass through and connect with the fabric piece clamping assembly 2.

[0034] The sample fabric piece clamping assembly 2 is composed of a prickly plate 6, a perforated plate 7, a fixed bolt 9, and a C-shaped frame 8. The pre-tightening force loading assembly is composed of a pre-tightening force loading bolt 11, a ring-shaped force sensor 12, and a ring-shaped bearing 13. A number of M10 bolt holes are provided on the C-shaped frame 8. The number of M10 bolt holes are respectively the a-side bolt holes, b-side bolt holes, and c-side bolt holes opened on three sides of the C-shaped frame 8. The a-side bolt holes and the c-side bolt holes are used to screw in the fixed bolts 9 to press and fix the prickly plate 6 and the perforated plate 7 stuffed into the C-shaped frame 8. The b-side bolt holes are used to connect with the pre-tightening force loading assembly, as Figure 4 shown.

[0035] In the fabric piece clamping assembly 2, the positions of the nails on the prickly plate 6 correspond one by one to the positions of the holes on the perforated plate 7. Place the prickly plate 6 and the perforated plate 7 on both sides of the area of the fabric sample 10 to be clamped respectively. At the same time, press the prickly plate 6 and the perforated plate 7 towards the middle, so that the nails on the prickly plate 6 pierce through the fabric sample 10 and insert into the perforated plate 7 to complete the preliminary installation of the prickly plate 6 and the perforated plate 7. Insert the prickly plate 6 and the perforated plate 7 with the installed fabric sample 10 into the groove of the C-shaped frame 8. The fabric sample 10 extends out from the gap of the groove of the C-shaped frame 8. Then, screw in the fixed bolt 9 from the side of the C-shaped frame 8. The fixed bolt 9 presses the prickly plate 6 and the perforated plate 7 to increase the friction force between the fabric sample 10 and the prickly plate 6 and the perforated plate 7. Through the friction force between the fabric sample 10 and the prickly plate 6 and the perforated plate 7, as well as the mechanical bite between the fabric sample 10 and the nails on the prickly plate 6, it is ensured that there is no obvious slip at the clamping boundary of the fabric sample 10 during the pre-tightening force loading process and the impact experiment process.

[0036] The fabric sample 10 used is as shown Figure 13 in a cross shape. The fabric piece clamping assembly 2 is installed in the rectangular areas extending around the fabric sample 10, and a total of four sets of fabric piece clamping assemblies 2 are installed. After complete installation, it is as shown Figure 3 . The fabric sample 10 with the fabric piece clamping assembly 2 installed is as shown Figure 1 inserted into the groove in the base 1, and then the pre-tightening force loading assemblies are installed on the four sides of the base 1. As shown Figure 1 , two sets of pre-tightening force loading assemblies are installed on each side of the base 1, and on each pair of opposite sides of the base 1, a pre-tightening force loading bolt 11 and a force sensor 12 are installed on one side, and only a pre-tightening force loading bolt 11 and a bearing 13 are installed on the other side. Pass the pre-tightening force loading bolt 11 through the round holes reserved on the edge 4 of the bottom plate and screw it into the threaded holes reserved on the C-shaped frame 8, then the fabric sample 10, the fabric piece clamping assembly 2, and the pre-tightening force loading assemblies can all be fixed on the base 1.

[0037] Furthermore, tighten the pre-tightening force loading bolt 11 on the side with the bearing 13 installed, then the fabric piece clamping assembly 2 can be pulled to apply a pre-tightening force to the fabric sample 10. At the same time, the force sensor 12 measures the tension received by the pre-tightening force loading bolt 11 and outputs the magnitude of the tension through a differential amplifier or a data acquisition system.

[0038] Taking a fabric sample material pre-tightening force loading and clamping device based on a light gas gun impact system described in Embodiment 1 of the present invention as an example, the actual operation process of this device will be specifically described

[0039] (1) Install the bottom plate edge 4 and the limit block 5 on the square bottom plate 3 in sequence to complete the assembly of the base 1. After the assembly is completed, fix the base 1 in the sample chamber.

[0040] (2) Cut the fabric sample 10 according to the Figure 7 shape, add the thorn plate 6 and the hole plate 7 to the areas extending from the four sides of the fabric sample 10, and insert the fabric sample 10, the thorn plate 6, and the hole plate 7 together into the groove of the C-shaped frame 8. Screw in the fixing bolt 9 from the side of the groove of the C-shaped frame 8 to press the fabric sample 10, the thorn plate 6, and the hole plate 7, and complete the installation of the fabric piece clamping assembly 2.

[0041] (3) Put the combination of the fabric sample 10 and the fabric clamping assembly 2 into the central groove of the base 1. On the four sides of the base 1, pass the pre-tightening force loading bolt 11 through the bottom plate edge 4 and screw it into the threaded holes reserved on the C-shaped frame 8. Among them, the force sensor 12 is worn on the pre-tightening force loading bolts 11 on the lower side and the right side of the base 1, and the bearing 13 is worn on the pre-tightening force loading bolts 11 on the other two sides.

[0042] (4) Tighten the pre-tightening force loading bolts 11 on the left and upper sides of the base 1 to apply a pre-tightening force to the fabric sample 10. When tightening the pre-tightening force loading bolts 11, pay attention to the output value of the force sensor 12 at the same time. The pre-tightening force applied to the fabric sample 10 in one direction is equal to the sum of the values of the two force sensors 12 in the corresponding direction. To ensure uniform distribution of the pre-tightening force in the fabric sample 10, it is recommended that the difference in values between the two force sensors 12 in the same direction does not exceed 5%.

[0043] (5) Install bullets and inflate the light gas gun to conduct a dynamic impact experiment on the sample.

[0044] (6) After the single impact experiment, only need to remove the pre-tightening force loading component, take out the combination of the fabric sample 10 and the fabric piece clamping component 2 as a whole from the sample chamber, and remove the fabric sample 10 for storage. Then a new fabric sample 10 can be installed again, installed according to the above process again, and the experiment can be repeated.

[0045] Compared with the prior art, the present invention has the following advantages and outstanding effects:

[0046] First, the device realizes mechanical occlusion of the clamping area of the fabric sample 10 by arranging multiple rows of nail spines, and provides additional friction by pressing the fabric sample 10 and the thorn plate 6 and the hole plate 7 with bolts, ensuring stable clamping of the device to the fabric sample 10;

[0047] Second, on the premise that the fabric sample 10 is tightly connected to the device, by means of the threaded holes reserved in the fabric piece clamping component 2, the fabric sample 10 is pulled by tightening the bolts to apply a biaxial pre-tightening force to the fabric sample 10;

[0048] Third, by means of the force sensor 12, the magnitude of the pre-tightening force applied to the fabric sample 10 in two directions is measured, realizing precise application of the pre-tightening force, and providing accurate parameters for establishing the quantitative relationship between the pre-tightening force state and the anti-impact performance of the fabric sample.

[0049] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A clamping device for preloading force of a flexible fabric sample based on a light gas gun impact system. This device consists of a base (1), a clamping assembly for the sample fabric piece (2), and a preloading force loading assembly, and is characterized in that; The sample fabric clamping assembly (2) is installed at the cross-groove in the center of the base (1). The pre-tightening force loading assembly is installed around the base (1), and several pre-tightening force loading assemblies are connected to the sample fabric clamping assembly (2). The base (1) provides rigid support for this device. Through the pre-tightening force loading assembly, a biaxial pre-tightening force is applied to the fabric sample (10), and through the sample fabric clamping assembly (2), the fabric sample (10) is stably clamped.

2. The pre-tightening force loading and clamping device for flexible fabric specimens based on the light gas gun impact system according to claim 1, wherein; The base (1) consists of a square bottom plate (3), four limit blocks (5) and four bottom plate edges (4). The four limit blocks (5) and the four bottom plate edges (4) are connected to the square bottom plate (3) by several (M8) bolts. The four bottom plate edges (4) are installed on the four sides of the square bottom plate (3), and the four limit blocks (5) are respectively installed at the four corners of the square bottom plate (3).

3. The pre-tightening force loading and clamping device for flexible fabric specimens based on a light gas gun impact system according to claim 2, characterized in that; The sample fabric clamping assembly (2) consists of a thorn plate (6), a hole plate (7), a fixing bolt (9) and a C-shaped frame (8). Several nail thorns are arranged at intervals on the thorn plate (6), and several through-round holes for accommodating the nail thorns are arranged at intervals on the hole plate (7). Several (M10) bolt holes are provided on the C-shaped frame (8).

4. The pre-tightening force loading and clamping device for flexible fabric specimens based on a light gas gun impact system according to claim 3, characterized in that; The pre-tightening force loading assembly consists of a pre-tightening force loading bolt (11), a ring force sensor (12) and a ring bearing (13). The pre-tightening force loading bolt (11) passes through the ring force sensor (12) or the ring bearing (13) and the round hole on the bottom plate edge (4), and is screwed into the reserved threaded hole on the C-shaped frame (8), connecting the fabric sample (10), the fabric clamping assembly (2) and the pre-tightening force loading assembly.

5. The pre-tightening force loading and clamping device for flexible fabric specimens based on a light gas gun impact system according to claim 4, wherein; A square hole is provided in the middle of the square bottom plate (3) for the bullet to impact or the high-speed camera to photograph the deformation of the sample.

6. The pre-tightening force loading and clamping device for flexible fabric specimens based on a light gas gun impact system according to claim 5, characterized in that; A 10-mm round hole for the pre-tightening force loading assembly to pass through and connect to the fabric clamping assembly (2) is provided on the bottom plate edge (4).

7. A pre-tightening force loading and clamping device for a flexible fabric sample based on a light gas gun impact system according to claim 6, characterized in that; Several of the (M10) bolt holes are the a-side bolt holes, b-side bolt holes and c-side bolt holes respectively opened on three sides of the C-shaped frame (8). The a-side bolt holes and the c-side bolt holes are used to screw in the fixing bolts (9) to tightly press and fix the thorn plate (6) and the hole plate (7) inserted into the C-shaped frame (8), and the b-side bolt holes are used to connect to the pre-tightening force loading assembly.

8. The pre-tightening force loading and clamping device for flexible fabric specimens based on a light gas gun impact system according to claim 7, characterized in that; The ring force sensor (12) is a bridge circuit sensor.

9. The clamping device for preloading the flexible fabric specimen based on the light gas gun impact system according to claim 8, wherein; Two groups of the pre-tightening force loading assemblies are installed on each side of the base (1). On the bottom plate edges (4) in the same direction, on one side of the bottom plate edge (4), it is a combination of the force sensor (12) and the pre-tightening force loading bolt (11), and on the other side of the bottom plate edge (4), it is a combination of the bearing (13) and the pre-tightening force loading bolt (11).

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