In-plane radiation tensile strain experimental device and method

Abstract

The present invention discloses an in-plane radiative tensile strain experimental device and method, comprising a cover plate, a nut, and a base, which are sequentially arranged. A top plate is provided above the base, and the top plate and the base are connected by a rotating disk. A through hole is provided in the middle of the cover plate and the nut for the top plate to pass through. A flexible film covering the through hole is provided between the cover plate and the nut. The cover plate and the nut are connected by a plurality of connecting members, and the nut is threadedly connected to the base. The present invention has a novel structure, and a circular flexible film is fixed between the circular cover plate and the nut by a screw, so that the film can be driven to rotate downward while the nut is rotated downward, and the rotating disk and the top plate are driven to rotate synchronously, but the top of the top plate does not move downward, thereby achieving uniform force in all directions in the plane of the flexible film, thereby ensuring the accuracy of the tensile test results. In addition, the experimental device has low production cost, simple operation, and can be applied to various scenarios.

Description

Technical Field

[0001] The present invention relates to the technical field of in-plane radiative tensile strain technology, and in particular to an in-plane radiative tensile strain experimental device and method. Background Art

[0002] Strain is one of the basic methods for studying the physical properties of materials. Among them, in-plane tensile strain is the most commonly used in industrial factory R&D or scientific research institutes. Currently, the in-plane tensile strain is limited to uniaxial, biaxial and multiaxial tensile strain, and the purpose of stretching is achieved through mechanical translation stages or motor-driven clamping mechanisms.

[0003] Even if multiaxial stretching is performed, the result is not strictly in-plane radial tensile strain, and it is difficult to ensure that the stretched film is subjected to uniform force in multiple directions during equibiaxial stretching. As a result, the accuracy of the in-plane tensile strain test results of the stretched film cannot be guaranteed. At the same time, the cost of using a mechanical translation stage or a motor-driven clamping mechanism for tensile strain is relatively high. Therefore, an in-plane radial tensile strain experimental device and method are proposed. Summary of the Invention

[0004] The object of the present invention is to provide an in-plane radial tensile strain experimental device and method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an in-plane radiation tensile strain experimental device, comprising a cover pressing plate, a nut and a base arranged in sequence, a top plate provided above the base, and the top plate and the base are connected by a rotating disk, a through hole for the top plate to pass through is provided in the middle of the cover pressing plate and the nut, a flexible film covering the through hole is provided between the cover pressing plate and the nut, the cover pressing plate and the nut are connected by a plurality of connecting parts, the nut is threadedly connected to the base, and a scale is provided in an annular shape on the circumferential outer surface of the nut.

[0006] As a further solution of the present invention: the connecting part is a screw, and the number of screws is multiple, the upper end surface of the nut is provided with multiple threaded holes, and the multiple threaded holes are evenly distributed along the side of the nut, and the number of the screws is multiple and the same as the number of threaded holes.

[0007] As a further solution of the present invention: a plurality of through holes are formed on the upper end surface of the cover pressing plate, and the plurality of through holes are evenly distributed along the outer edge of the cover pressing plate.

[0008] As a further solution of the present invention: a support rod for limiting the rotating disk is installed in the middle of the upper end surface of the base, and a limiting rod is symmetrically arranged on the circumferential outer surface of the rotating disk, and a limiting groove is symmetrically arranged on the inner wall of the nut cavity, and the limiting groove is adapted to the end of the limiting rod.

[0009] As a further solution of the present invention: the rotating disk is conical, the lower end surface of the rotating disk is provided with a limiting hole for inserting the end of the support rod, and the upper end surface of the rotating disk is installed with a block for limiting the rotation of the top plate.

[0010] As a further solution of the present invention: a card slot adapted to the card block is provided on the lower end surface of the top plate.

[0011] An in-plane radiative tensile strain test method, using the in-plane radiative tensile strain test apparatus according to any one of claims 1 to 6 to perform the test, comprising the following steps:

[0012] S1: Place the flexible film between the cover and the screw cap;

[0013] S2: Rotate the nut to move the flexible film downward relative to the top sheet;

[0014] S3: Read the magnitude of the in-plane radial tensile strain of the flexible film by the precession distance using the scale.

[0015] As a further solution of the present invention: S1 comprises the following steps:

[0016] S1.1 Place the flexible film over the through hole on the upper end face of the nut;

[0017] S1.2 Place the cover plate directly above the screw cap and flexible film;

[0018] S1.3 Pass the ends of the multiple connectors through the cover plate and extend them into the threaded holes of the nuts;

[0019] S1.4 realizes the compression of the cover pressing piece and the nut to complete the fixation of the flexible film.

[0020] As a further solution of the present invention: S2 comprises the following steps:

[0021] S2.1 Align the nut with the base interface;

[0022] S2.2 Rotate the nut so that it drives the rotating disk to rotate synchronously, and the nut descends while rotating along the threads of the outer ring of the base;

[0023] S2.3 The top sheet rotates synchronously with the rotating disk while maintaining a constant height, and the lowered flexible film contacts the upper end of the top sheet in-plane.

[0024] As a further solution of the present invention: S3 comprises the following steps:

[0025] The calculation formula of the in-plane radial tensile strain value is:

[0026]

[0027] Where ε is the in-plane radial tensile strain value, r1 and r2 are the inner diameter of the pressing plate and the radius of the top plate, respectively, and h is the screw-in distance of the nut.

[0028] Compared with the prior art, the beneficial effects of the present invention are: the present invention has a novel structure, and the circular flexible film is fixed between the circular cover plate and the nut by screws, so that the film can be driven to rotate downward while the nut is rotated downward, and the rotating disk and the top plate can be driven to rotate synchronously, but the top of the top plate does not move downward, thereby achieving uniform force in all directions within the surface of the flexible film, thereby ensuring the accuracy of the tensile test results, and the experimental device has low production cost, simple operation, and can be applied to various scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the disassembly of the tensile strain experimental device of the present invention;

[0030] Figure 2 Schematic diagram of the tensile strain experimental device of the present invention;

[0031] Figure 3 This is a schematic diagram of the in-plane radial tensile strain table of the present invention;

[0032] Figure 4 Schematic diagram of ε strain of the flexible film of the present invention;

[0033] Figure 5 For the present invention Figure 4 A cross-sectional schematic diagram;

[0034] Figure 6 This is a schematic diagram of the cover pressing sheet of the present invention;

[0035] Figure 7 is a schematic diagram of the interior of the nut of the present invention;

[0036] In the figure: 1. Connector; 2. Cover pressing piece; 3. Flexible film; 4. Nut; 5. Top piece; 6. Rotating disk; 7. Base; 8. Scale; 9. Limit groove. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] See also Figure 1-7In an embodiment of the present invention, an in-plane radiation tensile strain experimental device includes a cover pressing piece 2, a nut 4 and a base 7 arranged in sequence, a top piece 5 is provided above the base 7, and the top piece 5 and the base 7 are connected by a rotating disk 6, a through hole for the top piece 5 to pass through is opened in the middle of the cover pressing piece 2 and the nut 4, the outer diameter of the top piece 5 is smaller than the inner diameter of the through hole on the cover pressing piece 2 and the nut 4, and the top piece 5 and the cover pressing piece 2 are coaxially arranged, so that when the top piece 5 and the cover pressing piece 2 move relative to each other, the top piece 4 can enter the inner hole of the cover pressing piece 2, a flexible film 3 covering the through hole is provided between the cover pressing piece 2 and the nut 4, the cover pressing piece 2 and the nut 4 are connected by a plurality of connecting pieces 1, the nut 4 is threadedly connected to the base 7, the circumferential outer surface of the base 7 is provided with an external thread, and the external thread on the base 7 matches the internal thread on the nut 4, and the nut 4 is circumferential. A scale 8 is provided in a ring shape on the outer surface. By placing the flexible film 3 between the cover pressing piece 2 and the nut 4 and then rotating the nut 4, the screw-in distance of the nut 4 can be obtained through the scale 8 on the surface of the nut 4 (because the nut 4 will also drive the flexible film 3 to rotate synchronously and move downward while rotating, at this time when the top sheet 5 contacts the flexible film 3, the rotating disk 6 will rotate synchronously with the nut 4, and the top sheet 5 connected to the rotating disk 6 will also rotate together. Therefore, the flexible film 3, the nut 4, the top sheet 5 and the rotating disk 6 are all in a synchronous rotation state. In this way, the top sheet 5 can rotate synchronously with the flexible film 3 under the premise that the base 7 does not move, so as to ensure the accuracy of the tensile test results. If the top sheet 5 does not rotate synchronously with the flexible film 3, the force applied to the flexible film 3 will not only be the force in the radial direction, but also the force in the tangential direction of the top sheet 5).

[0039] See also Figure 1 In one embodiment, in order to connect the cover pressing piece 2 and the nut 4 together, in this embodiment, preferably, the connecting piece 1 is a screw, and the number of screws is multiple. The number of screws is not limited. In this embodiment, preferably, the number of screws is eight, and the eight screws are distributed in a ring near the outer edges of the cover pressing piece 2 and the nut 4. Both large and small numbers of screws can achieve the fixation of the flexible film 3 between the cover pressing piece 2 and the nut 4. When the number of screws is small, it is convenient to replace the flexible film 3 between the cover pressing piece 2 and the nut 4. When the number of screws is large, the connection between the cover pressing piece 2 and the nut 4 is tighter. The specific number can be selected according to actual conditions.

[0040] See also Figure 2 In one embodiment, in this embodiment, preferably, a plurality of through holes are opened on the upper end surface of the cover pressing piece 2, and the plurality of through holes are evenly distributed along the outer edge of the cover pressing piece 2, a plurality of threaded holes are opened on the upper end surface of the nut 4, and the plurality of threaded holes are evenly distributed along the side of the nut 4, and the number of through holes, threaded holes and screws of each set of experimental devices is the same, which is convenient for mutual coordination and unified use.

[0041] See also Figure 1In one embodiment, in order to ensure that the rotating disk 6 rotates synchronously with the nut 4 under the premise of keeping the height unchanged, in this embodiment, preferably, a support rod for limiting the rotating disk 6 is installed in the middle of the upper end surface of the base 7, so that the rotating disk 6 rotates axially along the side wall of the support rod, and the limiting rods are symmetrically provided on the circumferential outer surface of the rotating disk 6, and the limiting grooves 9 are symmetrically provided on the inner wall of the cavity of the nut 4, and the limiting grooves 9 are adapted to the end of the limiting rod.

[0042] Specifically, by inserting the end of the limit rod into the limit groove 9, the movement direction of the limit rod is limited so that the limit rod can only move along the length direction of the limit groove 9, so that the limit rod can move up and down in the limit groove 9. When the nut 4 rotates, since the limit groove 9 limits the horizontal movement of the limit rod, the rotating disk 6 rotates synchronously with the nut 4 at this time. When the nut 4 rotates and moves downward, the limit rod rises relative to the position in the limit groove 9, which can ensure that the rotating disk 6 and the top plate 5 rotate synchronously under the premise of unchanged height.

[0043] See also Figure 1 In one embodiment, in order to facilitate the replacement of the top sheet 5, in this embodiment, preferably, the rotating disk 6 is conical, and a limiting hole for inserting the end of the support rod is provided on the lower end surface of the rotating disk 6. A block for limiting the rotation of the top sheet 5 is installed on the upper end surface of the rotating disk 6, and a slot adapted to the block is provided on the lower end surface of the top sheet 5. Further, the top sheet 5 and the block at the upper end of the rotating disk 6 are connected and cannot rotate, so that the purpose of replacing the top sheet can be achieved.

[0044] An in-plane radiative tensile strain test method, using the in-plane radiative tensile strain test apparatus according to any one of claims 1 to 6 for conducting the experiment, characterized in that it comprises the following steps:

[0045] S1: Place the flexible film 3 between the cover pressing piece 2 and the nut 4;

[0046] S1.1 Place the flexible film 3 on the through hole on the upper end surface of the nut 4;

[0047] S1.2 Place the cover plate 2 directly above the nut 4 and the flexible film 3;

[0048] S1.3 Pass the ends of the multiple connectors 1 through the cover plate 2 and extend them into the threaded holes of the nut 4;

[0049] S1.4: Press the cover plate 2 and the nut 4 tightly to fix the flexible film 3;

[0050] S2: Rotate the nut 4 to move the flexible film 3 downward relative to the top sheet 5;

[0051] S2.1 Align the nut 4 with the base 7 interface;

[0052] S2.2 Rotate the nut 4, so that the nut 4 drives the rotating disk 6 to rotate synchronously, and the nut 4 descends while rotating along the threads of the outer ring of the base 7;

[0053] S2.3 The top sheet 5 rotates synchronously with the rotating disk 6 at a constant height, and the descending flexible film 3 contacts the upper end of the top sheet 5 in-plane;

[0054] S3: Read the magnitude of the in-plane radial tensile strain of the flexible film 3 caused by the precession distance using the scale 8:

[0055] The calculation formula of the in-plane radial tensile strain value is:

[0056]

[0057] Where ε is the in-plane radial tensile strain value, r1 and r2 are the inner diameter of the cover plate 2 and the radius of the top plate 5, respectively, and h is the screw-in distance of the nut 4. In the strain value calculation formula, ι0 and ι, ι0 represents the initial length (the initial length of the flexible film 3 located in the through-hole through the center origin diameter), that is, the length without strain, and ι is the real-time length with strain.

[0058] like Figure 3 As shown, assuming r1 is 5mm, and the control variable r2 is 1mm, 2mm, 3mm, and 4mm respectively, there is only one variable h (that is, x, x represents the precession distance) and one strain variable (that is, y, y represents the strain);

[0059] When r2 is 1mm,

[0060] When r2 is 2mm,

[0061] When r2 is 3mm,

[0062] When r2 is 4mm,

[0063] The working principle and usage process of the present invention are as follows: first, the flexible film 3 to be tested is placed in the middle between the cover pressing plate 2 and the nut 4, then the multiple connecting parts 1 on the cover pressing plate 2 are rotated in sequence to tightly connect the cover pressing plate 2 and the nut 4 to ensure that the position of the flexible film 3 is fixed, then 5 is fixed to the upper end of the base 6, and finally, by rotating the nut 4, it drives the flexible film 3 to move downward relative to the top plate 5, and finally, the screw-in distance is read through the scale 8 to obtain the magnitude of the in-plane radial tensile strain on the flexible film 3.

[0064] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0065] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent modifications made according to the scope of the claims of the present application are within the scope of protection of the claims of the present application.

Claims

1. An in-plane radiation tensile strain experimental device, characterized in that: The invention comprises a cover pressing piece (2), a nut (4) and a base (7) which are arranged in sequence, a top piece (5) is provided above the base (7), and the top piece (5) and the base (7) are connected by a rotating disk (6), a through hole for the top piece (5) to pass through is opened in the middle of the cover pressing piece (2) and the nut (4), a flexible film (3) covering the through hole is provided between the cover pressing piece (2) and the nut (4), the cover pressing piece (2) and the nut (4) are connected by a plurality of connecting pieces (1), the nut (4) is threadedly connected to the base (7), and a scale (8) is provided in an annular shape on the circumferential outer surface of the nut (4); A support rod for limiting the rotating disk (6) is installed in the middle of the upper end surface of the base (7), and a limiting rod is symmetrically arranged on the circumferential outer surface of the rotating disk (6). A limiting groove (9) is symmetrically arranged on the inner wall of the nut (4) cavity, and the limiting groove (9) is adapted to the end of the limiting rod, and the end of the limiting rod is inserted into the interior of the limiting groove (9).

2. The in-plane radiation tensile strain experimental device according to claim 1, characterized in that: The connecting member (1) is a screw, and the number of screws is multiple. The upper end surface of the nut (4) is provided with multiple threaded holes, and the multiple threaded holes are evenly distributed along the side of the nut (4). The number of the screws is multiple and the same as the number of the threaded holes.

3. The in-plane radiation tensile strain test device according to claim 1, characterized in that: The upper end surface of the cover pressing plate (2) is provided with a plurality of through holes, and the plurality of through holes are evenly distributed along the outer edge of the cover pressing plate (2).

4. The in-plane radiation tensile strain test device according to claim 3, characterized in that: The rotating disk (6) is conical in shape, and a limiting hole for inserting the end of the support rod is provided on the lower end surface of the rotating disk (6). A block for limiting the rotation of the top plate (5) is installed on the upper end surface of the rotating disk (6).

5. The in-plane radiation tensile strain test device according to claim 4, characterized in that: The lower end surface of the top plate (5) is provided with a card slot adapted to the card block.

6. An in-plane radiative tensile strain test method, using the in-plane radiative tensile strain test apparatus according to any one of claims 1 to 5 for conducting the experiment, characterized in that: The following steps are involved: S1: Place the flexible film (3) between the cover pressing piece (2) and the screw cap (4); S2: Rotate the nut (4) to move the flexible film (3) downward relative to the top sheet (5); S3: Read the magnitude of the in-plane radial tensile strain value of the flexible film (3) caused by the precession distance through the scale (8).

7. The in-plane radial tensile strain test method according to claim 6, characterized in that: Said S1 comprises the following steps: S1.1 Place the flexible film (3) on the through hole on the upper end surface of the nut (4); S1.2 Place the cover plate (2) directly above the nut (4) and the flexible film (3); S1.3 Pass the ends of the plurality of connectors (1) through the cover pressing plate (2) and extend them into the threaded holes of the nut (4); S1.4 realizes the pressing of the cover pressing piece (2) and the nut (4) to complete the fixing of the flexible film (3).

8. The in-plane radial tensile strain test method according to claim 6, characterized in that: The S2 comprises the following steps: S2.1 Align the nut (4) with the base (7) interface; S2.2 Rotate the nut (4) so ​​that the nut (4) drives the rotating disk (6) to rotate synchronously, and the nut (4) descends while rotating along the threads of the outer ring of the base (7); S2.3 The top sheet (5) rotates synchronously with the rotating disk (6) at a constant height, and the descending flexible film (3) contacts the upper end of the top sheet (5) in the surface.

9. The in-plane radial tensile strain test method according to claim 6, characterized in that: The S3 includes the following steps: The calculation formula of the in-plane radial tensile strain value is: Where ε is the in-plane radial tensile strain value, r1 and r2 are the radii of the inner diameter of the pressing plate and the top plate respectively, h is the screw-in distance of the nut, and ι0 and ι in the strain value calculation formula, ι0 represents the initial length, and ι is the real-time length with strain added.

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