A bonding and positioning device for a type I interlaminar fracture toughness test loading block

Abstract

This utility model discloses a bonding and positioning device for a type I interlaminar fracture toughness test loading block, relating to the field of material mechanical property testing technology. It includes a loading block and a sample. One end of the loading block is equipped with a glue spraying mechanism, a positioning mechanism, and a fastening mechanism that are assembled with each other. The glue spraying mechanism includes an adhesive mixing bottle, a lead screw, a lead screw hole, a nozzle, and a fixing bolt. The positioning mechanism includes threaded holes in the thickness direction, threaded holes in the width direction, a sample loading hole, a side positioning block, a positioning auxiliary device fixing bolt, a width direction fastening bolt, a thickness direction fastening bolt, and a positioning auxiliary device fixing bolt. The fastening mechanism includes a fixing clamp, a positioning auxiliary device, a gear, a fastening rotating rod, and a pin. This utility model, through this positioning device, can effectively ensure that the loading block and the sample remain parallel and aligned, providing a reliable guarantee for subsequent testing or use, and ensuring the accuracy and reliability of the test results.

Description

Technical Field

[0001] This utility model relates to the field of material mechanical property testing technology, specifically to a bonding and positioning device for a type I interlaminar fracture toughness test loading block. Background Technology

[0002] In the field of interlaminar fracture toughness testing of composite materials, the accurate determination of Type I interlaminar fracture toughness is crucial for evaluating the delamination properties of composite materials. Currently, the test method provided by ASTM D5528 / D5528M is widely used both domestically and internationally, employing a double cantilever beam (DCB) specimen. One of its core steps is to attach loading blocks to the ends of the specimen to apply tensile loads; the loading blocks should be parallel to and aligned with the specimen. However, the current technology still faces significant technical bottlenecks in the attachment and positioning process of the loading blocks, relying mainly on manual positioning operations, which makes it difficult to meet the requirements of high precision and high repeatability testing.

[0003] In Type I interlaminar fracture toughness tests, accurate positioning and bonding of the loading blocks are crucial to the reliability of the test results. Currently, the most common method for bonding loading blocks is manual positioning. Manual positioning typically relies on the operator's experience, adjusting the position of the loading blocks visually or using tools such as rulers, and then bonding and curing them with adhesives such as epoxy resin. Although this method is simple to operate, it suffers from low positioning accuracy, uneven adhesive layer thickness, and is highly susceptible to displacement or tilting of the loading blocks due to human factors. It is difficult to ensure the coaxiality and symmetry of the loading blocks on both sides, leading to load eccentricity and affecting the accuracy of the test results. Furthermore, the operation is cumbersome, requires experience to adjust the position, is inefficient, and is prone to positioning failure due to movement before the adhesive cures.

[0004] To address this issue, some laboratories employ custom-made fixtures for positioning, such as metal frames with guide grooves. However, these fixtures are typically single-function, capable of only unidirectional positioning and unable to simultaneously guarantee the parallelism and symmetry of the loading blocks. Furthermore, existing fixtures are mostly designed for specimens of specific sizes, lacking versatility and failing to meet the needs of different standard or non-standard specimens. Utility Model Content

[0005] The purpose of this invention is to provide a bonding and positioning device for a type I interlaminar fracture toughness test loading block, in order to solve the problems mentioned in the background art. The existing loading block bonding method is mainly manual positioning, which has low positioning accuracy, uneven adhesive layer thickness, and is very easy to cause the loading block to shift or tilt due to human factors. It is difficult to ensure the coaxiality and symmetry of the loading blocks on both sides, resulting in load eccentricity and thus affecting the accuracy of the test results.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a bonding and positioning device for a type I interlaminar fracture toughness test loading block, comprising a loading block and a sample. One end of the loading block is provided with a glue spraying mechanism, a positioning mechanism, and a fastening mechanism that are assembled with each other. The glue spraying mechanism includes an adhesive mixing bottle, a lead screw, a lead screw hole, a nozzle, and a fixing bolt. The positioning mechanism includes a threaded hole in the thickness direction, a threaded hole in the width direction, a sample loading hole, a side positioning block, a fixing threaded hole, a positioning auxiliary device fixing bolt, a width direction fastening bolt, a thickness direction fastening bolt, and a positioning auxiliary device fixing bolt. The fastening mechanism includes a fixing clamp, a positioning auxiliary device, a gear, a fastening rotating rod, and a pin.

[0007] Preferably, the positioning auxiliary device is movably inserted into the cavity of the positioning auxiliary device loading hole, the positioning auxiliary device fixing bolt is fixedly connected to the side positioning block, and the gear meshes with the fixing clamp.

[0008] Preferably, the sample is horizontally inserted into the cavity of the sample loading hole, and the sample is in close contact with the side positioning block.

[0009] Preferably, the width-direction fastening bolt is threadedly connected to the width-direction threaded hole, and the thickness-direction fastening bolt is threadedly connected to the thickness-direction threaded hole.

[0010] Preferably, the loading block is placed on the sample and fits tightly against the positioning aid.

[0011] Preferably, the bottom of the loading block is in full contact with and adheres to the sample.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] In terms of positioning accuracy and test quality, this utility model's positioning device enables the loading block and the sample to maintain better parallelism and alignment. The parallelism can be controlled within ≤0.03mm, and the perpendicularity can be controlled within ≤0.03mm, ensuring the coaxiality and symmetry of the loading blocks on both sides, making the experimental data more accurate.

[0014] In terms of ease of operation, this positioning device does not require operators to rely on experience to operate, making it simple to use and greatly reducing the barrier to entry.

[0015] This positioning device uses a threaded fixing method, which provides greater flexibility. Its design can accommodate sample thicknesses less than 6.10 mm and widths less than 29.9 mm.

[0016] The positioning device is equipped with a glue spraying mechanism, which can apply glue evenly and avoid stress concentration caused by uneven glue thickness when applied manually. At the same time, it uses clamps to fix the loading block to prevent it from moving before the adhesive cures, thus ensuring positioning accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall assembly structure of the bonding and positioning device for a type I interlaminar fracture toughness test loading block according to the present invention.

[0018] Figure 2 This is an exploded structural diagram of a bonding and positioning device for a type I interlaminar fracture toughness test loading block according to the present invention.

[0019] Figure 3 This is an exploded structural diagram of the adhesive spraying mechanism of the bonding and positioning device for a type I interlaminar fracture toughness test loading block according to the present invention.

[0020] Figure 4 This is an exploded structural diagram of the positioning mechanism of the bonding and positioning device for a type I interlaminar fracture toughness test loading block according to the present invention.

[0021] Figure 5 This is a schematic diagram of the explosive structure of the fastening mechanism of the bonding and positioning device for a type I interlaminar fracture toughness test loading block according to this utility model.

[0022] In the diagram: 1. Spraying mechanism; 101. Adhesive mixing bottle; 102. Lead screw; 103. Lead screw hole; 104. Nozzle; 105. Fixing bolt; 2. Positioning mechanism; 201. Thickness direction threaded hole; 202. Width direction threaded hole; 203. Sample loading hole; 204. Side positioning block; 205. Fixing threaded hole; 206. Positioning auxiliary device loading hole; 207. Width direction fastening bolt; 208. Thickness direction fastening bolt; 209. Positioning auxiliary device fixing bolt; 3. Loading block; 4. Sample; 5. Fastening mechanism; 501. Fixing clamp; 502. Positioning auxiliary device; 503. Gear; 504. Fastening rotating rod; 505. Pin. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 This utility model provides a technical solution: a bonding and positioning device for a type I interlaminar fracture toughness test loading block, including a loading block 3 and a sample 4. One end of the loading block 3 is provided with a glue spraying mechanism 1, a positioning mechanism 2, and a fastening mechanism 5 that are assembled with each other. The glue spraying mechanism 1 includes an adhesive mixing bottle 101, a lead screw 102, a lead screw hole 103, a nozzle 104, and a fixing bolt 105. The positioning mechanism 2 includes a threaded hole 201 in the thickness direction, a threaded hole 202 in the width direction, a sample loading hole 203, a side positioning block 204, a fixing threaded hole 205, a positioning auxiliary device fixing bolt 206, a width direction fastening bolt 207, a thickness direction fastening bolt 208, and a positioning auxiliary device fixing bolt 209. The fastening mechanism 5 includes a fixing clamp 501. The positioning auxiliary device 502, gear 503, fastening rotating rod 504, and pin 505 are included. The positioning auxiliary device 502 is movably inserted into the cavity of the positioning auxiliary device loading hole 206. The positioning auxiliary device fixing bolt 209 is fixedly connected to the side positioning block 204. The gear 503 meshes with the fixing clamp 501. The sample 4 is horizontally inserted into the cavity of the sample loading hole 203. The sample 4 is tightly fitted with the side positioning block 204. The width direction fastening bolt 207 is threadedly connected to the width direction threaded hole 202. The thickness direction fastening bolt 208 is threadedly connected to the thickness direction threaded hole 201. The loading block 3 is placed on the sample 4 and is tightly fitted with the positioning auxiliary device 502. The bottom of the loading block 3 is in full contact with and adheres to the sample 4.

[0025] Working Principle 1: Place the positioning device horizontally and stably on the operating table, ensuring its bottom surface is in complete contact with the table surface and avoiding tilting. Next, assemble the adhesive spraying mechanism 1 and the positioning mechanism 2 using the thickness-direction fastening bolts 208. Clean the surface of the sample 4 and the loading block 3 with alcohol, then measure the length of the loading block 3 as 29.85 mm using calipers. Insert the positioning auxiliary device 502 into the positioning auxiliary device loading hole 206 on the positioning mechanism 2 and adjust its position so that it extends 29.85 mm beyond the front end of the sample loading hole 203. The sample 4 used in this case has dimensions of 25.40 mm in width and 4.12 mm in thickness. After slightly polishing the sample 4, place it horizontally into the sample loading hole 203 of the positioning mechanism 2. The front end of the sample 4 should be tightly fitted with the positioning auxiliary device 502, and the side of the sample 4 should be tightly fitted with the side positioning block 204. After placing the sample 4, insert the width-direction fastening bolts 207 into the corresponding width-direction threaded holes 202 and apply a torque of 0.5 N·m to fix the sample 4 in the width direction. Then, insert the thickness-direction fastening bolts 208 into the corresponding thickness-direction threaded holes 201 and tighten them to ensure the sample 4 is also firmly fixed in the thickness direction. After fixing the sample 4, add the adhesive to the adhesive mixing bottle 101 according to the specified ratio. Control the position of the nozzle 104 by rotating the lead screw 102 to evenly spray 1g of adhesive onto the surface of the sample 4. After spraying, place the loading block 3 on the sample 4, ensuring that its side, which is the same width as the sample 4, is tightly fitted against the positioning auxiliary device 502, and its other side is tightly fitted against the side positioning block 204. Ensure the bottom of the loading block 3 is in full contact with and bonded to the sample 4. Finally, rotate and tighten the rotating rod 504 to ensure the fixing plate 501 is tightly fitted against the loading block 3, and then use the pin 505 for fixation. After fixing, wait for the adhesive to fully cure. After curing, the parallelism and perpendicularity between sample 4 and loading block 3 were measured to be 0.02 mm using an image measuring instrument. This ensures the parallelism and alignment of sample 4 and loading block 3, providing a reliable guarantee for subsequent tests or use, and ensuring the accuracy and reliability of the test results.

[0026] Working Principle 2: Place the positioning device horizontally and stably on the operating table, ensuring its bottom surface is in complete contact with the table surface and avoiding tilting. Next, assemble the adhesive spraying mechanism 1 and the positioning mechanism 2 using the thickness-direction fastening bolts 208. Clean the surface of the sample 4 and the loading block 3 with alcohol, then measure the length of the loading block 3 as 13.04 mm using calipers. Insert the positioning auxiliary device 502 into the positioning auxiliary device loading hole 206 on the positioning mechanism 2 and adjust its position so that it extends 13.04 mm beyond the front end of the sample loading hole 203. The sample 4 used in this case has dimensions of 15.03 mm in width and 4.99 mm in thickness. After slightly polishing the sample 4, place it horizontally into the sample loading hole 203 of the positioning mechanism 2. The front end of the sample 4 should be tightly fitted with the positioning auxiliary device 502, and the side of the sample 4 should be tightly fitted with the side positioning block 204. After placing the sample 4, insert the width-direction fastening bolts 207 into the corresponding width-direction threaded holes 202 and apply a torque of 0.5 N·m to fix the sample 4 in the width direction. Then, insert the thickness-direction fastening bolts 208 into the corresponding thickness-direction threaded holes 201 and tighten them to ensure the sample 4 is also firmly fixed in the thickness direction. After fixing the sample 4, add the adhesive to the adhesive mixing bottle 101 according to the specified ratio. Control the position of the nozzle 104 by rotating the lead screw 102 to evenly spray 0.9 g of adhesive onto the surface of the sample 4. After spraying, place the loading block 3 on the sample 4, ensuring that its side, which is the same width as the sample 4, is tightly fitted against the positioning auxiliary device 502, and its other side is tightly fitted against the side positioning block 204. Ensure the bottom of the loading block 3 is in full contact with and bonded to the sample 4. Finally, rotate and tighten the rotating rod 504 to ensure the fixing plate 501 is tightly fitted against the loading block 3, and then use the pin 505 for fixation. After fixing, wait for the adhesive to fully cure. After curing, the parallelism between sample 4 and loading block 3 was measured to be 0.03 mm and the perpendicularity was 0.02 mm using an image measuring instrument. This ensured the parallelism and alignment of sample 4 and loading block 3.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bonding and positioning device for a loading block for a type I interlaminar fracture toughness test, comprising a loading block (3) and a specimen (4), characterized in that: One end of the loading block (3) is provided with a glue spraying mechanism (1), a positioning mechanism (2) and a fastening mechanism (5) that are assembled with each other. The glue spraying mechanism (1) includes an adhesive mixing bottle (101), a lead screw (102), a lead screw hole (103), a nozzle (104) and a fixing bolt (105). The positioning mechanism (2) includes a thickness direction threaded hole (201), a width direction threaded hole (202), a sample loading hole (203), a side positioning block (204), a fixing threaded hole (205), a positioning auxiliary device loading hole (206), a width direction fastening bolt (207), a thickness direction fastening bolt (208), and a positioning auxiliary device fixing bolt (209). The fastening mechanism (5) includes a fixing clamp (501), a positioning auxiliary device (502), a gear (503), a fastening rotating rod (504), and a pin (505).

2. The bonding and positioning device for the type I interlaminar fracture toughness test loading block according to claim 1, characterized in that: The positioning auxiliary device (502) is movably inserted into the cavity of the positioning auxiliary device loading hole (206), the positioning auxiliary device fixing bolt (209) is fixedly connected to the side positioning block (204), and the gear (503) meshes with the fixing clamp (501).

3. The bonding and positioning device for the type I interlaminar fracture toughness test loading block according to claim 2, characterized in that: The sample (4) is horizontally inserted into the cavity of the sample loading hole (203), and the sample (4) is in close contact with the side positioning block (204).

4. The bonding and positioning device for the type I interlaminar fracture toughness test loading block according to claim 3, characterized in that: The width-direction fastening bolt (207) is threadedly connected to the width-direction threaded hole (202), and the thickness-direction fastening bolt (208) is threadedly connected to the thickness-direction threaded hole (201).

5. The bonding and positioning device for the type I interlaminar fracture toughness test loading block according to claim 4, characterized in that: The loading block (3) is placed on the sample (4) and fits tightly against the positioning auxiliary device (502).

6. The bonding and positioning device for the type I interlaminar fracture toughness test loading block according to claim 5, characterized in that: The bottom of the loading block (3) is in full contact with and bonded to the sample (4).

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