Tensile contrast stress concentration demonstration teaching aid

Abstract

The utility model relates to the technical field of experimental teaching aids, in particular to a tensile contrast stress concentration demonstration teaching aid, which comprises a support, and two groups of fixing rods which are arranged at intervals are erected on the support. Two fixed seats are arranged between the two groups of fixed rods; a rubber sheet is arranged between the two fixed seats; and a transparent detection plate close to the rubber sheet is also arranged on the fixed rod. According to the tensile contrast stress concentration demonstration teaching aid designed by the utility model, the two fixing seats are driven to be close to or far away from each other by adopting the positive and negative tooth adjusting screw rod, so that the rubber sheet is accurately stretched or loosened, and the stress distribution and change of a material under different stretching conditions can be intuitively displayed. Besides, standard grid lines are arranged on the transparent detection plate and the outer surface of the rubber sheet, so that an observer can more accurately observe and measure deformation and stress distribution conditions of the rubber sheet in the stretching process, and the demonstration accuracy and intuition are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental teaching aids, in particular to a tensile contrast stress concentration demonstration teaching aid. Background Art

[0002] In science and engineering teaching, tensile stress concentration demonstration aids play a vital role, helping students intuitively understand the stress concentration phenomenon in materials subjected to tensile forces. However, traditional teaching aids have structural and functional limitations that limit the effectiveness of teaching.

[0003] Traditional tensile stress concentration demonstration aids are relatively simple in structure, offer limited visual effects, and offer unclear contrast. These aids can only demonstrate stress concentration when a material is subjected to a single tensile force, failing to fully reflect the stress distribution and changes under varying tensile conditions.

[0004] To address the shortcomings of traditional teaching aids, a number of improved tensile stress concentration demonstration aids have gradually emerged on the market. However, while these improved teaching aids have improved their demonstration effectiveness, they still have some shortcomings. In particular, the various parts of these teaching aids are often fixed together, making the display angle unadjustable or difficult to adjust. This significantly limits the flexibility of the teaching aids, making it difficult for teachers to flexibly adjust them according to teaching needs, thus affecting teaching effectiveness. Utility Model Content

[0005] The utility model aims at the technical problems existing in the prior art and provides a tensile contrast stress concentration demonstration teaching aid to solve the problem that the above-mentioned traditional stress teaching aids cannot fully reflect the stress distribution and changes of materials under different tensile conditions.

[0006] The utility model provides a technical solution for solving the above-mentioned technical problems as follows: a teaching aid for demonstrating tensile contrast stress concentration, comprising a bracket, on which are mounted two groups of spaced-apart fixing rods; two fixing seats are provided between the two groups of fixing rods; a rubber sheet is provided between the two fixing seats; a transparent detection plate close to the rubber sheet is also provided on the fixing rod; and a positive and negative thread adjustment screw is provided along the tensile direction of the rubber sheet and is transmission-connected to the two fixing seats, and the positive and negative thread adjustment screw rotates forward and backward to drive the two fixing seats closer to or away from each other.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the outer surfaces of the rubber sheet and the transparent detection plate are both provided with standard grid lines.

[0009] Furthermore, the transparent detection plate is an acrylic plate.

[0010] Furthermore, a sliding groove adapted to the two sets of fixing rods is formed on the edge of the fixing seat.

[0011] Furthermore, the fixing seat includes two connectable clamping blocks, and the clamping blocks are equipped with a bolt 1 for locking the rubber sheet.

[0012] Furthermore, the fixing rod is also provided with a connecting seat which is detachably connected to the transparent detection plate.

[0013] Furthermore, the connecting seat is provided with a second bolt for fixing the transparent detection plate.

[0014] Furthermore, the transparent detection plate and the center of the rubber sheet are provided with standard detection holes of the same size.

[0015] Furthermore, the standard detection hole is a square hole or a round hole.

[0016] Furthermore, a handwheel is provided at the input end of the forward and reverse thread adjusting screw.

[0017] Furthermore, the tensile stress concentration demonstration teaching aid provided by the present invention has at least the following beneficial effects compared with the prior art:

[0018] This practical, designed stretching and stress concentration demonstration aid uses a positive and negative threaded adjustment screw to move two fixed bases closer or further apart, enabling precise stretching and relaxation of a rubber sheet. This intuitively demonstrates the stress distribution and changes in the material under different stretching conditions. Furthermore, the standardized grid lines on the transparent inspection plate and the outer surface of the rubber sheet allow the observer to more accurately observe and measure the deformation and stress distribution of the rubber sheet during stretching, enhancing the accuracy and intuitiveness of the demonstration.

[0019] This practical teaching aid features numerous structural innovations, including a sliding groove design on the edge of the mounting base, an attachable clamping block and locking bolts, and a removable connection between the transparent inspection plate and the mounting rod. These features not only enhance the teaching aid's flexibility, allowing teachers to adjust it to meet teaching needs, but also facilitate its maintenance and replacement. In particular, the standard inspection hole in the transparent inspection plate, aligned with the center of the rubber sheet, allows observers to directly observe the stress distribution within the sheet, further enhancing the demonstration and helping improve student understanding and retention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the main view of the utility model;

[0021] Figure 2 This is the rear view of the utility model;

[0022] Figure 3 It is a schematic diagram of the local structure of the utility model.

[0023] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0024] 1. Bracket; 2. Fixing rod; 3. Fixing seat; 3.1. Slide; 3.2. Bolt 1; 3.3. Clamp; 4. Rubber sheet; 5. Transparent detection plate; 6. Adjusting screw for positive and negative threads; 7. Connecting seat; 7.1. Bolt 2; 8. Handwheel DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integrated structures. Those skilled in the art will understand the specific meanings of such terms in this patent based on specific circumstances.

[0027] like Figure 1 、 Figure 2 and Figure 3 As shown in the figure, this practical design of a tensile stress concentration demonstration teaching aid includes a bracket 1 mounted with two sets of spaced-apart fixing rods 2; two fixing seats 3 are located between the two sets of fixing rods 2; a rubber sheet 4 is positioned between the two fixing seats 3; a transparent detection plate 5 is mounted on the fixing rods 2 and positioned close to the rubber sheet 4; and a positive and negative thread adjustment screw 6, drivingly connected to the two fixing seats 3 along the stretching direction of the rubber sheet 4, is provided. The positive and negative thread adjustment screw 6 rotates forward and backward to move the two fixing seats 3 closer or further away from each other, thereby stretching or relaxing the rubber sheet. The transparent detection plate 5 is used to observe stress concentration in the rubber sheet during the stretching process.

[0028] As an embodiment, the outer surfaces of the rubber sheet 4 and the transparent detection plate 5 are both provided with standard grid lines to facilitate observation and measurement of the deformation and stress distribution of the rubber sheet during the stretching process.

[0029] Specifically, the transparent detection plate 5 is an acrylic plate, which has good transparency and durability and can clearly show the stress concentration phenomenon of the rubber sheet.

[0030] As an embodiment, a sliding groove 3.1 is formed on the edge of the fixing seat 3 to adapt to the two groups of fixing rods 2, so that the fixing seat can slide smoothly along the fixing rods, so that the standard grid lines on the rubber sheet 4 are aligned with the standard grid lines on the transparent detection plate 5 to intuitively reflect the stress concentration situation.

[0031] Specifically, the fixing seat 3 includes two connectable clamping blocks 3.3, and the clamping blocks 3.3 are equipped with bolts 3.2 for locking the rubber sheet 4, which is convenient for locking the rubber sheet 4 and can also regularly replace rubber sheets 4 of different specifications.

[0032] As an embodiment, the fixing rod 2 is further provided with a connecting seat 7 which is detachably connected to the transparent detection plate 5 .

[0033] Specifically, the connecting seat 7 is provided with bolts 7.1 for fixing the transparent detection plate 5, so that the user can easily install or remove the transparent detection plate as needed, which is convenient for maintenance and replacement.

[0034] As an embodiment, the transparent inspection plate 5 is provided with a standard inspection hole of the same size as the center of the rubber sheet 4. This hole allows an observer to directly observe the stress distribution within the rubber sheet, particularly any areas of stress concentration that may occur during stretching. Because the transparent inspection plate is transparent, the deformation and stress changes that occur in the rubber sheet during stretching can be clearly observed.

[0035] The input end of the forward and reverse thread adjusting screw 6 is provided with a hand wheel 8 so that the user can rotate the forward and reverse thread adjusting screw 6 more easily.

[0036] It should be noted that, in this article, the terms "include", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. Unless otherwise expressly specified and limited, the terms "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0038] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A tensile stress concentration demonstration teaching aid, characterized in that: The invention comprises a bracket (1), wherein two groups of fixed rods (2) arranged at intervals are mounted on the bracket (1); two fixed seats (3) are arranged between the two groups of fixed rods (2); a rubber sheet (4) is arranged between the two fixed seats (3); a transparent detection plate (5) close to the rubber sheet (4) is also mounted on the fixed rod (2); and a positive and negative thread adjustment screw (6) connected to the two fixed seats (3) in a transmission manner is also provided along the stretching direction of the rubber sheet (4); the positive and negative thread adjustment screw (6) rotates positively and negatively to drive the two fixed seats (3) to move closer to or farther away from each other.

2. The tensile stress concentration demonstration teaching aid according to claim 1, characterized in that: The outer surfaces of the rubber sheet (4) and the transparent detection plate (5) are both provided with standard grid lines.

3. The tensile stress concentration demonstration teaching aid according to claim 2, characterized in that: The transparent detection plate (5) is an acrylic plate.

4. The tensile stress concentration demonstration teaching aid according to claim 1, characterized in that: The edge of the fixing seat (3) is formed with a sliding groove (3.1) adapted to the two groups of fixing rods (2).

5. The tensile stress concentration demonstration teaching aid according to claim 4, characterized in that: The fixing seat (3) comprises two connectable clamping blocks (3.3), and a bolt (3.2) for locking the rubber sheet (4) is mounted on the clamping blocks (3.3).

6. The tensile stress concentration demonstration teaching aid according to claim 1, characterized in that: The fixing rod (2) is also provided with a connecting seat (7) which is detachably connected to the transparent detection plate (5).

7. The tensile stress concentration demonstration teaching aid according to claim 6, characterized in that: The connecting seat (7) is provided with a second bolt (7.1) for fixing the transparent detection plate (5).

8. The tensile stress concentration demonstration teaching aid according to any one of claims 1 to 7, characterized in that: The transparent detection plate (5) and the rubber sheet (4) are provided with corresponding standard detection holes of the same size at their centers.

9. The tensile stress concentration demonstration teaching aid according to claim 8, characterized in that: The standard detection hole is a square hole or a round hole.

10. The tensile stress concentration demonstration teaching aid according to claim 1, characterized in that: The input end of the positive and negative thread adjusting screw (6) is provided with a hand wheel (8).

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