Positioning and pasting tool for composite material interlayer fracture toughness sample loading block
By designing the positioning and pasting fixture of the fixture base and the pressing block unit, the problems of low pasting efficiency and position offset of the loading block of the composite material interlayer fracture toughness specimen were solved, and efficient and accurate test results were achieved.
Patent Information
- Application Number
- CN202422622893.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-10-29
AI Technical Summary
In the prior art, the pasting efficiency of the loading block for testing the fracture toughness of composite materials between layers is low, and positional displacement is easily caused during the heating and curing process, resulting in inaccurate test data.
A positioning and pasting tool consisting of a tool base and a pressing block unit was designed. The cooperation between the first trough body and the second trough body ensured that the loading block was flush with the edge of the specimen, and the pressing block body and the sliding rod were used to achieve stable positioning of the loading block to prevent position displacement.
The accuracy and efficiency of pasting the loading block and the specimen are improved, the accuracy of the test data is ensured, the position offset during the heating and curing process is reduced, and the test efficiency is improved.
Smart Images
Figure CN223314505U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of composite material testing, and in particular relates to a positioning and pasting tool for a composite material interlayer fracture toughness sample loading block. Background Art
[0002] Composite materials, due to their high specific strength, high specific modulus, and lightweight properties, have seen widespread application in aerospace, automotive, wind power, and other fields in recent years, representing a promising engineering material. However, a weak link in composite materials lies in their poor interlaminar performance. Delamination failure can easily occur after low-velocity impact loading during use, threatening the safety of composite structural components in automobiles and aircraft. Therefore, interlaminar performance is a key concern in composite structural design, and interlaminar fracture toughness is a measure of a composite material's ability to resist delamination.
[0003] According to the load form, composite material delamination can be type I (opening type), type II (shear type), type III (tearing type), and mixed type. Among them, type I delamination is the most basic and most dangerous delamination mode. The test of type I interlaminar fracture toughness is of great significance in engineering practice.
[0004] In the prior art, a double cantilever beam (DCB) is usually used to measure composite material specimens. For example, when measuring the mode I interlaminar fracture toughness of unidirectional fiber reinforced plastic composite materials, loading blocks need to be attached to the upper and lower surfaces of the specimen to apply the load. Figure 1 However, currently, each specimen requires a separate, manual attachment of a loading block, which is inefficient and can easily cause the loading block to be misaligned with the specimen edge, leading to deviations and non-parallel positions of the two loading block center holes on the upper and lower surfaces of the specimen. After the loading blocks are attached to the specimen, they must be placed in an oven for heating and curing. Due to the lack of a fixing device, the loading blocks may shift during oven heating, resulting in inaccurate test data.
[0005] Therefore, how to provide a loading fast positioning and pasting tool with a simple structure and good pasting effect is very important to improve the test efficiency and accuracy of mode I interlaminar fracture toughness. Summary of the Invention
[0006] The utility model aims to provide a positioning and pasting tool for a composite material interlaminar fracture toughness specimen loading block, in particular for I-type composite materials.
[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0008] A positioning and pasting tool for a composite material interlaminar fracture toughness specimen loading block, comprising:
[0009] Tooling base: The tooling base is provided with a positioning unit, which includes a first trough and a second trough. The first trough is used to place the sample, and the second trough is used to place the loading block. The second trough is located at one end of the first trough, and the first trough extends toward one end of the second trough. The edges of the first and second troughs are located on the same straight line.
[0010] Pressing block unit: The pressing block unit includes a pressing block body, which is arranged above the second trough body and can move relative to the second trough body.
[0011] Preferably, in the above technical solution, the first trough forms obstructions on both sides thereof, achieving positioning without affecting the extension of the sample to the second trough; the second trough forms obstructions on all sides thereof, which can achieve positioning of the lower loading block on all sides.
[0012] Preferably, the above technical solution is that the positioning unit includes a support, the support is arranged on the upper surface of the tooling base, the first trough is opened on the support, and the position of the first trough is relatively high, so that after the sample is placed, it can extend to the lower loading block placed on the second trough.
[0013] Preferably, in the above technical solution, the second trough is provided on the upper surface of the tooling base.
[0014] Preferably, the above technical solution is such that the pressing block unit further includes a slide rod, which is arranged on the tooling base and extends in a vertical direction. The pressing block body can be slidably mounted on the slide rod, and the slide rod not only realizes the connection of the pressing block body, but also serves as a sliding guide.
[0015] Further preferably, a pair of sliding rods are provided, and the pressing block body is simultaneously sleeved on the pair of sliding rods, so that the sliding of the pressing block body is more stable.
[0016] More preferably, a pair of the slide bars are arranged on opposite sides of the second slot body, the spacing between the pair of slide bars is consistent with the width of the second slot body, and the pair of slide bars can position the loading block from both sides.
[0017] Still further preferably, a stopper is provided on one side of the second trough body away from the first trough body, and a pair of the sliding rods and the stopper respectively position the loading block from three sides.
[0018] Preferably, in the above technical solution, the positioning units and the pressing block units are provided in multiple groups, and the extension directions of the first grooves on the multiple groups of positioning units are parallel. Multiple samples can be pasted and fixed each time, with high pasting efficiency, which can improve test efficiency.
[0019] Further preferably, both ends of the first trough body are penetrated, and one of the pressing units corresponding to the two adjacent positioning units is located at one end of the corresponding first trough body, and the other is located at the other end of the first trough body. As many positioning units and pressing units as possible can be arranged on one tooling base, which improves efficiency and makes the distribution of the positioning units and pressing units more compact.
[0020] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:
[0021] The utility model ensures that the edge of the loading block is flush with the edge of the sample through the first groove and the second groove, and the positions of the central circular holes of the two loading blocks on the upper and lower surfaces of the sample remain parallel; when placed in an oven for heating and curing, it can ensure that there is no position offset between the loading block and the sample, thereby improving the accuracy of the test results; in addition, the pasting efficiency is high, thereby improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Attachment Figure 1 This is a schematic diagram of composite material sample testing in the prior art;
[0023] Attachment Figure 2 This is a schematic diagram of the structure of the tooling of the utility model;
[0024] Attachment Figure 3 This is a schematic diagram of the use of the tooling of the utility model.
[0025] In the above attached figures:
[0026] 1. Tooling base; 10. First tank; 100. Support; 11. Second tank;
[0027] 2. Pressing unit; 20. Pressing body; 21. Sliding rod;
[0028] 3. Sample;
[0029] 4. Loading block; 40. Upper loading block; 41. Lower loading block. DETAILED DESCRIPTION
[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.
[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] like Figure 2 The positioning and pasting fixture for a composite material interlaminar fracture toughness specimen loading block shown in the figure comprises a fixture base 1 and a pressing block unit 2. Each unit is described in detail below:
[0033] The fixture base 1 is provided with a positioning unit comprising a first trough 10 and a second trough 11. The first trough 10 is used to hold the specimen, while the second trough 11 is used to hold the loading block. The second trough 11 is located at one end of the first trough 10, extending from the first trough 10 toward one end of the second trough 11. The edges of the first and second troughs 10, 11, lie on the same straight line. This allows the specimen to be placed in the first trough 10 and the loading block to be placed in the second trough 11. Once the specimen extends onto the loading block, the edges of the two can be aligned.
[0034] In this embodiment, the first trough 10 forms blocks on both sides to achieve positioning without affecting the extension of the sample to the second trough 11; the second trough 11 forms blocks on all sides to achieve positioning of the lower loading block on all sides.
[0035] In one implementation of this embodiment: the positioning unit includes a support 100, the support 100 is arranged on the upper surface of the tooling base 1, and the first trough 10 is opened on the support 100; the second trough 11 is opened on the upper surface of the tooling base 1, so that the position of the first trough 10 is higher, which satisfies the requirement that after the sample is placed, it just extends to the lower loading block placed on the second trough 11.
[0036] The pressing block unit 2 includes a pressing block body 20 and a sliding rod 21. The pressing block body 20 is arranged above the second trough body 11 and can move relative to the second trough body 11; the sliding rod 21 is arranged on the tooling base 1, and the sliding rod 21 extends in the vertical direction. The pressing block body 20 can be slidably mounted on the sliding rod 21. The sliding rod 21 not only realizes the connection of the pressing block body 20, but also plays the role of sliding guide.
[0037] In one implementation of this embodiment, a pair of slide bars 21 are provided, and the pressing block body 20 is simultaneously mounted on the pair of slide bars 21, making the sliding of the pressing block body 20 more stable. Preferably, the pair of slide bars 21 are provided on opposite sides of the second trough 11, and the spacing between the pair of slide bars 21 is consistent with the width of the second trough 11. The pair of slide bars 21 can position the upper loading block from both sides.
[0038] More preferably, a stopper is provided on one side of the second trough body 11 away from the first trough body 10 (not shown in the figure), and a pair of slide bars 21 and the stopper respectively position the loading block from three sides.
[0039] In this embodiment, multiple groups of positioning units 1 and pressing units 2 are provided, and the extension directions of the first grooves 10 on the multiple groups of positioning units 1 are parallel. In this way, multiple samples can be pasted and fixed each time, with high pasting efficiency, which can improve test efficiency.
[0040] In one implementation of this embodiment: both ends of the first trough body 10 are penetrated, one of the pressing units 2 corresponding to the two adjacent positioning units 1 is located at one end of the corresponding first trough body 10, and the other is located at the other end of the first trough body 10. As many positioning units 1 and pressing units 2 as possible can be arranged on a tooling base 1, which improves efficiency and makes the distribution of the positioning units 1 and pressing units 2 more compact.
[0041] The following describes the usage of this embodiment in detail:
[0042] First, slide the pressing block body 20 upwards, place the lower loading block 41 in the second slot 11, and apply a mixture of glue and curing agent on the lower loading block 41; then place the sample 3 in the first slot 10, so that the sample 3 extends to the lower loading block 41; then apply a mixture of glue and curing agent on the upper loading block 40, so that the upper loading block 40 is placed on the sample 3 on the lower loading block 41, and slide the pressing block body 20 downwards so that the pressing block body 20 presses the upper loading block 40, the sample 3 and the lower loading block 41 to complete the positioning and pasting. Multiple samples can be placed at a time, such as Figure 3 shown.
[0043] The utility model fixes the positions of the sample 3 and the loading block by the first trough body 10 and the second trough body 11 to ensure that the positions of the sample 3 and the loading block will not shift, and then presses the loading block by the pressing block body 20 to prevent the loading block and the sample from shifting during heating and curing.
[0044] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.
Claims
1. A positioning and pasting tool for a composite material interlaminar fracture toughness specimen loading block, characterized by: include: Tooling base: The tooling base is provided with a positioning unit, which includes a first trough and a second trough. The first trough is used to place the sample, and the second trough is used to place the loading block. The second trough is located at one end of the first trough, and the first trough extends toward one end of the second trough. The edges of the first and second troughs are located on the same straight line. Pressing block unit: The pressing block unit includes a pressing block body, which is arranged above the second trough body and can move relative to the second trough body.
2. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 1 is characterized by: The first trough forms barriers on both sides thereof; the second trough forms barriers all around it.
3. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 1 or 2, characterized in that: The positioning unit includes a support, the support is arranged on the upper surface of the tooling base, and the first trough is opened on the support.
4. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 1 or 2, characterized in that: The second trough is arranged on the upper surface of the tooling base.
5. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 1 is characterized in that: The pressing block unit further comprises a slide bar, which is arranged on the tooling base and extends in a vertical direction. The pressing block body is slidably sleeved on the slide bar.
6. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 5, characterized in that: A pair of sliding rods are provided, and the pressing block body is simultaneously sleeved on the pair of sliding rods.
7. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 6, characterized in that: A pair of the slide bars are arranged on opposite sides of the second slot body, and a distance between the pair of the slide bars is consistent with a width of the second slot body.
8. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 7, characterized in that: A stopper is provided on one side of the second trough body away from the first trough body.
9. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 1, characterized in that: The positioning units and the pressing block units are provided in multiple groups, and the extension directions of the first grooves on the multiple groups of positioning units are parallel.
10. The positioning and pasting tool for the composite material interlaminar fracture toughness specimen loading block according to claim 9, characterized in that: Both ends of the first slot body pass through, and one of the pressing block units corresponding to two adjacent positioning units is located at one end of the corresponding first slot body, and the other is located at the other end of the first slot body.