Reinforcing sheet cementing tool meeting requirements of SACMA SRM 1 standard compression test piece

Abstract

The utility model relates to the technical field of compression test tools, in particular to a reinforcing sheet cementing tool meeting the requirements of SACMA SRM 1 standard compression test pieces, which is composed of a lower bottom plate, an upper pressing plate and a positioning check block. A test plate and a reinforcing sheet are placed between the lower bottom plate and the upper pressing plate; the upper surface of the lower bottom plate is provided with a positioning stop block for positioning the test plate; the lower bottom plate and the upper pressing plate are detachably connected together through a screw; the lower bottom plate and the positioning stop block are connected through a hexagon bolt; the left side and the right side of each of the lower bottom plate and the upper pressing plate are each provided with a handle. According to the invention, the positioning precision of the reinforcing sheet and the test plate can be improved, and uniform and flat connection can be formed. Dependence of quality of the test piece on experience of operators is eliminated, protectiveness of the reinforcing piece on the end portion of the test piece is improved, and unacceptable damage is prevented. The reliability and accuracy of a test result are improved, and a more effective data basis is provided for further research on product strength.

Description

Technical Field

[0001] This utility model relates to the field of compression testing fixtures, and in particular to a reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens. Background Technology

[0002] Carbon fiber prepreg is widely used in military and civilian fields due to its good axial strength, high modulus, light weight, mechanical properties and impact resistance.

[0003] To accurately and scientifically evaluate the performance of carbon fiber prepregs, whether in material-level testing or structural design testing, assessing the compressive properties of the prepregs is particularly important. The standard uses the SACMA recommended test method (SACMA 1R-94) for the compressive properties of oriented fiber reinforced resin composites to measure the compressive strength of carbon fiber prepregs. Reinforcing sheets are required to ensure that the specimens do not exhibit unacceptable failure modes at the ends during testing, thereby improving the accuracy and reliability of the data.

[0004] When fabricating test specimens using the SACMA 1R-94 standard, the bonding requirements for the reinforcing sheets are extremely high, including dimensions, accuracy, and position, with accuracy being the most critical. Because the gaps in the test plates are very small, and currently the bonding of reinforcing sheets mainly relies on manual marking, this presents a significant challenge to the operator's skills and eyesight.

[0005] Manual pasting has the following main disadvantages: 1. Position and accuracy rely on manual measurement and control, resulting in poor sample quality and low efficiency. This often manifests as asymmetry between the upper and lower reinforcing plates, and the middle section lacking a reinforcing plate being too large, significantly impacting subsequent test data. 2. Uneven pressure on the test plate can lead to reinforcing plates detaching during testing. Therefore, a convenient, stable, efficient, and effective sample preparation method is needed. Utility Model Content

[0006] In view of this, the purpose of this utility model is to propose a reinforcing sheet bonding tool that meets the requirements of SACMA SRM 1 standard compression test specimens, so as to solve the technical problems in the prior art.

[0007] To achieve the above objectives, this utility model provides a reinforcing sheet bonding fixture that meets the requirements of SACMA SRM standard compression test specimens. The fixture includes a split lower base plate and an upper pressure plate, wherein the lower base plate and the upper pressure plate have the same length and width dimensions, and both have several mating bolt holes at the same positions. The reinforcing sheet bonding fixture further includes:

[0008] A positioning block is fixedly connected to the lower base plate. The positioning block is an L-shaped plate composed of a vertical part and a horizontal part, and the horizontal part of the positioning block is located between the lower base plate and the upper pressure plate.

[0009] A reinforcing sheet is located between the lower base plate and the upper pressure plate. The reinforcing sheet is the same size as the test plate used for the compression test, and the length of the reinforcing sheet is less than the length of the lower base plate, and the width of the reinforcing sheet is less than half the width of the lower base plate.

[0010] Furthermore, the positioning blocks are provided in four sets, with two sets of positioning blocks located on the left side of the lower base plate and the other two sets symmetrically arranged on the right side of the lower base plate.

[0011] Furthermore, a front-to-back ridge is provided at the middle position of the upper surface of the lower base plate, and the height difference between the ridge and the upper surface of the lower base plate is equal to the thickness of a reinforcing sheet. A front-to-back ridge is also provided at the middle position of the lower surface of the upper pressure plate, and the height difference between the ridge and the lower surface of the upper pressure plate is equal to the thickness of a reinforcing sheet.

[0012] Furthermore, the upper surface of the lower base plate is provided with two overflow grooves, which are located on the left and right sides of the protrusion, respectively. The lower surface of the upper pressure plate is also provided with two overflow grooves, which are located on the left and right sides of the protrusion, respectively.

[0013] Furthermore, two test plates are sandwiched between the lower base plate and the upper pressure plate, and the two test plates are located on the left and right sides of the lower base plate and the upper pressure plate, respectively.

[0014] According to the claim, a reinforcing sheet bonding fixture that meets the requirements of SACMA SRM standard compression test specimens is provided, wherein the reinforcing sheet comprises four pieces, which are respectively bonded to the upper and lower sides of two test plates.

[0015] Furthermore, a handle is provided on each of the front and rear side walls of the lower base plate, and a handle is provided on each of the left and right side walls of the upper pressure plate.

[0016] Furthermore, the vertical part of the positioning block is threadedly connected to the outer wall of the lower base plate by a hexagonal bolt, and the gap between the vertical part of the positioning block and the outer wall of the lower base plate can be adjusted by the hexagonal bolt.

[0017] Furthermore, the horizontal portion of the positioning block presses against the upper surface of the lower base plate, and the thickness of the horizontal portion of the positioning block is less than or equal to the total thickness of the test plate plus two reinforcing plates, while the thickness of the horizontal portion of the positioning block is greater than or equal to the total thickness of the test plate plus one reinforcing plate.

[0018] The beneficial effects of this utility model are as follows: 1. By designing positioning blocks to position the reinforcing plates, the reinforcing plates are prevented from moving outward, and the test plate is sandwiched between the two reinforcing plates. Therefore, the positioning accuracy of the test plate and the reinforcing plates can be ensured, the position accuracy can be improved, and adverse situations such as positional displacement of the test plate and the reinforcing plates during assembly, handling and testing can be avoided.

[0019] 2. A raised strip running in the front-to-back direction is provided at the middle position of the upper surface of the lower base plate and the middle position of the lower surface of the upper pressure plate. Excess adhesive grooves are provided on both sides of the raised strips on the lower base plate and the upper pressure plate. This design ensures sufficient adhesion between the reinforcing sheet and the test plate under the pressure of the lower base plate and the upper pressure plate, while releasing excess adhesive. This allows the lower base plate and the upper pressure plate to clamp the test plate and the reinforcing sheet more tightly and stably, meeting the requirements for test pieces with reinforcing sheets and reducing the dependence of test piece quality on operator experience.

[0020] 3. Handles are installed at different positions on the lower base plate and upper pressure plate. The lower base plate and upper pressure plate are separate units connected by bolts. The positioning blocks are also connected to the lower base plate via hexagonal bolts. Therefore, it is very flexible in use and assembly, and adjustments to various spacing positions are convenient and accurate. It is lightweight, easy to use, and simple to operate. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure and principle of the device of this utility model.

[0023] Figure 2 This is an exploded view of the structure of the device of this utility model.

[0024] Figure 3 This is a schematic diagram of the assembly of the test plate on the lower base plate in the device of this utility model.

[0025] Figure 4 This is a schematic diagram of the structure of the lower base plate and the upper pressure plate in the device of this utility model.

[0026] Figure 5 This is a schematic diagram showing the reinforcing sheet of this utility model being removed from the tooling after being bonded to the test.

[0027] The diagram is marked as follows:

[0028] 1. Bottom plate, 2. Top pressure plate, 3. Positioning block, 4. Test plate, 5. Reinforcing plate, 6. Bolt hole, 7. Glue overflow groove, 8. Hex bolt, 9. Handle. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] The first aspect of this utility model is as follows: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, to reduce reliance on worker experience and skills, a split-type lower base plate 1 and upper pressure plate 2 were designed. The lower base plate 1 and upper pressure plate 2 have the same length and width dimensions, and together they can clamp the test plate 4 and reinforcing plate 5 between the lower base plate 1 and upper pressure plate 2. The reinforcing plate 5 has the same dimensions as the test plate 4 used for compression tests, and its length is less than the length of the lower base plate 1, while its width is less than half the width of the lower base plate 1.

[0032] Therefore, two test plates 4 are sandwiched between the lower base plate 1 and the upper pressure plate 2, and the two test plates 4 are located on the left and right sides of the lower base plate 1 and the upper pressure plate 2, respectively. In addition, there are four reinforcing plates 5, which are respectively bonded to the upper and lower sides of the two test plates 4.

[0033] Several matching bolt holes 6, preferably six, are provided at the same positions on the lower base plate 1 and the upper pressure plate 2. The lower base plate 1 and the upper pressure plate 2 are connected by bolts, which makes assembly and disassembly very convenient and ensures the stability after clamping.

[0034] Additionally, a positioning block 3 is fixedly connected to the lower base plate 1. The positioning block 3 is an L-shaped plate composed of a vertical part and a horizontal part, and the horizontal part of the positioning block 3 is located between the lower base plate 1 and the upper pressure plate 2. The horizontal part of the positioning block 3 is used to position the test plate 4 and the reinforcing piece 5. The thickness of the horizontal part of the positioning block 3 can be changed to different specifications to meet the needs of making test pieces with different size requirements, thereby maximizing the value of the tooling.

[0035] The vertical part of the positioning block 3 is threaded to the outer wall of the lower base plate 1 by a hexagonal bolt 8, and the gap between the vertical part of the positioning block 3 and the outer wall of the lower base plate 1 can be adjusted by the hexagonal bolt 8. The horizontal part of the positioning block 3 presses against the upper surface of the lower base plate 1. The thickness of the horizontal part of the positioning block 3 is less than or equal to the total thickness of the test plate 4 plus the two reinforcing plates 5, and greater than or equal to the total thickness of the test plate 4 plus the one reinforcing plate 5.

[0036] Preferably, the positioning blocks 3 are provided in four sets, of which two sets of positioning blocks 3 are provided on the left side of the lower base plate 1, and the other two sets are symmetrically provided on the right side of the lower base plate 1.

[0037] By designing positioning blocks 3 to position reinforcing plates 5, the reinforcing plates 5 are prevented from moving outward, and the test plate 4 is sandwiched between the two reinforcing plates 5. Therefore, the positioning accuracy of the test plate 4 and the reinforcing plates 5 can be ensured, the position accuracy can be improved, and adverse situations such as positional displacement of the test plate 4 and the reinforcing plates 5 during assembly, handling and testing can be avoided.

[0038] The second aspect of this utility model is as follows: Figure 1 , Figure 2 and Figure 5 As shown, to facilitate better glue application and to ensure that the glue is applied too thickly, a front-to-back ridge is provided in the middle of the upper surface of the lower base plate 1. The height difference between this ridge and the upper surface of the lower base plate 1 is equal to the thickness of a reinforcing sheet 5. In addition, a front-to-back ridge is also provided in the middle of the lower surface of the upper pressure plate 2. The height difference between this ridge and the lower surface of the upper pressure plate 2 is equal to the thickness of a reinforcing sheet 5.

[0039] Two overflow grooves 7 are provided on the upper surface of the lower base plate 1. These two overflow grooves 7 are located on the left and right sides of the protrusion, respectively. Two overflow grooves 7 are also provided on the lower surface of the upper pressure plate 2. These two overflow grooves 7 are located on the left and right sides of the protrusion, respectively.

[0040] Preferably, a handle 9 is provided on the front and rear side walls of the lower base plate 1, and a handle 9 is provided on the left and right side walls of the upper pressure plate 2.

[0041] Therefore, before the experiment, two layers of release agent were first applied to the upper surface of the bottom plate 1, and then a reinforcing sheet 5 was placed on each of the left and right sides of the bottom plate 1. Then, adhesive or adhesive film was applied to the bonding surface between the reinforcing sheet 5 and the test plate 4 as required.

[0042] Then begin assembling the test plate 4. First, place the test plate 4 on the lower reinforcing sheet 5, ensuring it fits snugly and is aligned. Then, place the reinforcing sheet 5 on top of the test plate 4, applying adhesive or film to the contact surfaces of both reinforcing sheets 5 and the test plate 4.

[0043] Next, place the positioning block 3 on the outside of the test plate 4 and the reinforcing plate 5. Apply two layers of release agent to the lower surface of the upper pressure plate 2, place it on top of the test plate 4 and the reinforcing plate 5, use the hex bolt 8 to push the positioning block 3 to press and position the reinforcing plate 5, and then use bolts to press the upper pressure plate 2 and the lower base plate 1 together.

[0044] Finally, place it in an oven and cure it according to the curing parameters. After curing, remove the upper pressure plate 2 and the lower base plate 1, and then remove the positioning block 3 and the upper pressure plate 2 again. Take out the completed test piece, clean the tooling, and then you can start making the next test piece.

[0045] In summary, this utility model, by designing a positioning stop 3 to position the reinforcing piece 5, prevents the reinforcing piece 5 from shifting outwards. The test plate 4 is sandwiched between the two reinforcing pieces 5, thus ensuring the positioning accuracy of the test plate 4 and the reinforcing piece 5, improving positional accuracy, and avoiding adverse situations such as positional displacement of the test plate 4 and the reinforcing piece 5 during assembly, handling, and testing. Furthermore, a front-to-back convex strip is provided at the middle position of the upper surface of the lower base plate 1 and the middle position of the lower surface of the upper pressure plate 2, and overflow grooves 7 are provided on the left and right sides of the convex strip of the lower base plate 1 and the upper pressure plate 2. While ensuring that the reinforcing piece 5 is fully bonded to the test plate 4 under the pressure of the lower base plate and the upper pressure plate, excess overflow adhesive can be released, allowing the lower base plate 1 and the upper pressure plate 2 to clamp the test plate 4 and the reinforcing piece 5 more tightly and stably, meeting the requirements of test pieces with reinforcing pieces and eliminating the dependence on operator experience for test piece quality.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention includes the claims being limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0047] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens, comprising a split lower base plate (1) and an upper pressure plate (2), wherein the lower base plate (1) and the upper pressure plate (2) have the same length and width dimensions, and both have a plurality of mating bolt holes (6) at the same positions, characterized in that, The reinforcing sheet bonding fixture also includes: A positioning block (3) is fixedly connected to the lower base plate (1). The positioning block (3) is an L-shaped plate composed of a vertical part and a horizontal part, and the horizontal part of the positioning block (3) is located between the lower base plate (1) and the upper pressure plate (2). A reinforcing sheet (5) is located between the lower base plate (1) and the upper pressure plate (2). The reinforcing sheet (5) is the same size as the test plate (4) used for the compression test, and the length of the reinforcing sheet (5) is less than the length of the lower base plate (1), and the width of the reinforcing sheet (5) is less than half the width of the lower base plate (1).

2. The reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens according to claim 1, characterized in that, The positioning blocks (3) are provided in four sets, of which two sets of positioning blocks (3) are located on the left side of the lower base plate (1), and the other two sets are symmetrically arranged on the right side of the lower base plate (1).

3. The reinforcing sheet bonding fixture according to claim 1, which meets the requirements of SACMA SRM 1 standard compression test specimens, is characterized in that... The lower base plate (1) has a front-to-back protrusion at the middle of its upper surface. The height difference between the protrusion and the upper surface of the lower base plate (1) is equal to the thickness of a reinforcing sheet (5). The upper pressure plate (2) also has a front-to-back protrusion at the middle of its lower surface. The height difference between the protrusion and the lower surface of the upper pressure plate (2) is equal to the thickness of a reinforcing sheet (5).

4. A reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens according to claim 3, characterized in that, The upper surface of the lower base plate (1) is provided with two overflow grooves (7), which are located on the left and right sides of the protrusion. The lower surface of the upper pressure plate (2) is also provided with two overflow grooves (7), which are located on the left and right sides of the protrusion.

5. A reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens according to claim 1 or 4, characterized in that, Two test plates (4) are sandwiched between the lower base plate (1) and the upper pressure plate (2), and the two test plates (4) are located on the left and right sides of the lower base plate (1) and the upper pressure plate (2), respectively.

6. A reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens according to claim 5, characterized in that, The reinforcing sheet (5) consists of four pieces, which are respectively bonded to the upper and lower sides of the two test plates (4).

7. A reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens according to claim 1, characterized in that, Each of the front and rear side walls of the lower base plate (1) is provided with a handle (9), and each of the left and right side walls of the upper pressure plate (2) is provided with a handle (9).

8. A reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens according to claim 1 or 2, characterized in that, The vertical part of the positioning block (3) is threaded to the outer wall of the lower base plate (1) by a hexagonal bolt (8), and the gap between the vertical part of the positioning block (3) and the outer wall of the lower base plate (1) can be adjusted by the hexagonal bolt (8).

9. A reinforcing sheet bonding fixture that meets the requirements of SACMA SRM 1 standard compression test specimens according to claim 8, characterized in that, The horizontal part of the positioning block (3) presses on the upper surface of the bottom plate (1). The thickness of the horizontal part of the positioning block (3) is less than or equal to the total thickness of the test plate (4) plus two reinforcing plates (5). The thickness of the horizontal part of the positioning block (3) is greater than or equal to the total thickness of the test plate (4) plus one reinforcing plate (5).

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