Elastomer provided with stress relief holes

Abstract

The present application relates to the field of elastomer, and discloses an elastomer provided with stress release holes, comprising a shell, a thin plate, a spring arranged at the bottom of the clamping plate and fixed on the shell away from one end of the clamping plate, used for resetting the clamping plate in cooperation with the thin plate, a push plate fixed on the side of the clamping plate away from the thin plate, used for providing space for pushing, a first release hole opened in the thin plate, used for accommodating large deformation of the thin plate when stressed, and quickly releasing the main stress, and a second release hole opened in the thin plate, used for dredging the secondary stress of the stress concentration area easily generated at the edge of the first release hole and the wave crest and wave trough of the thin plate. The present application achieves the technical effects of dispersing stress and optimizing the stress transmission path through the combined design of the wave-shaped thin plate and the main hole and the auxiliary hole, solves the problem that the thin plate is prone to cracks due to stress concentration when stressed, and improves the fatigue resistance of the thin plate and prolongs the service life of the device as a whole.

Description

Technical Field

[0001] This invention relates to the field of elastomer technology, and in particular to an elastomer with stress relief holes. Background Technology

[0002] In existing technologies, elastomers, due to their recoverable deformation capability, are widely used in various locking devices as core components for switching between locking and unlocking states. In simple latch structures, the elastomer is usually connected to an actuating mechanism. When an external force is applied to deform the elastomer, it can drive the latch's tongue or groove to shift, thereby completing the locking or unlocking action. Common elastomers often adopt a flat plate structure, and some have a single circular hole on the surface to accommodate deformation requirements. Materials used are mainly spring steel and highly elastic plastics, ensuring the stability of the latch state through their own elastic restoring force.

[0003] With the increasing application of locking devices in scenarios involving frequent state switching, the service life and reliability of the elastomer have become key concerns. During repeated stress deformation, the edges of the circular holes on the surface of a flat elastomer are prone to stress concentration, especially at right angles or acute angles. Over time, micro-cracks can easily appear and gradually propagate, leading to elastomer fracture and failure. Simultaneously, the single circular hole design is insufficient for dissipating secondary stresses generated during deformation, resulting in poor deformation uniformity of the elastomer, affecting the accuracy of the locking state switching, and increasing the maintenance frequency of the locking device. Summary of the Invention

[0004] The purpose of this invention is to provide an elastomer with stress relief holes, which solves the problems of existing elastomers in locking devices, such as easy breakage and failure due to stress concentration, poor deformation uniformity, and high maintenance frequency.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An elastomer with stress relief holes, comprising:

[0007] The shell, as the supporting structure, provides space for objects to fit into;

[0008] A thin plate is disposed inside the housing, and a clamping plate is fixed on the side away from the housing to allow deformation to change the position of the clamping plate;

[0009] A spring is located at the bottom of the clamping plate, with its end away from the clamping plate fixed to the housing. It is used to work with the thin plate to reset the clamping plate.

[0010] A lever, which is fixed to the side of the clamp away from the thin plate, is used to provide space for turning;

[0011] The first release hole is located inside the thin plate and is used to accommodate the large deformation of the thin plate when it is under stress, so as to quickly release the principal stress.

[0012] The second relief hole is located inside the thin plate and is used to relieve secondary stress at the edge of the first relief hole and in areas where stress concentration is likely to occur at the peaks and troughs of the thin plate.

[0013] The curved surface is set at the location where the first relief hole is opened in the thin plate to avoid stress concentration caused by right angles and acute angles;

[0014] The protective component is located at the position where the second relief hole is opened in the thin plate, and is used to provide protection and self-healing capability when stress is generated.

[0015] Preferably, the protective component includes a protective layer and a self-healing capsule, wherein the protective layer is filled with polytetrafluoroethylene and sprayed into the holes of the thin plate having a second release hole;

[0016] The self-healing capsule is installed at the location where the second release port is opened in the shell.

[0017] Preferably, the spraying step of the protective layer includes:

[0018] S11. Wipe the surface of the second release hole with alcohol, let it dry, then spray a coating with a single layer thickness of 15-20μm using a spray gun, and then let it dry at room temperature.

[0019] S12. Bake in an oven at 180-220℃ for 25-40 minutes to form a protective layer.

[0020] Preferably, the self-healing capsule comprises a core material and a wall material;

[0021] The core material comprises the following components in parts by weight:

[0022] Bisphenol A epoxy resin, 60-70 parts;

[0023] Methylhexahydrophthalic anhydride, 25-30 parts;

[0024] Benzyl dimethylamine, 2-3 parts;

[0025] Nano calcium carbonate, 3-5 parts;

[0026] The wall material comprises the following components in parts by weight:

[0027] Pharmaceutical grade gelatin, 40-50 parts;

[0028] Gum arabic, 30-35 parts;

[0029] Polyvinyl alcohol, 10-15 parts;

[0030] Glycerin, 5-8 parts.

[0031] Preferably, the preparation method of the self-repairing capsule includes the following steps:

[0032] S21. Take bisphenol A epoxy resin, add nano calcium carbonate, stir at high speed of 1500-2000 rpm for 15-20 minutes, and then ultrasonically disperse at 200-300W for 10-15 minutes; add methyl hexahydrophthalic anhydride and benzyl dimethylamine in sequence, and stir at 400-600 rpm for 5-7 minutes to obtain the core material repair solution.

[0033] S22. Take gelatin and gum arabic, add deionized water, heat and stir in a water bath at 60-70℃ until dissolved; then add polyvinyl alcohol and glycerin, stir continuously at 600-800 rpm for 20-30 minutes, and finally cool to 30-35℃ to obtain the wall material solution.

[0034] S23. Add the core material repair solution to cyclohexane and shear at a high speed of 2500-3500 rpm for 10 minutes to form uniform core material droplets.

[0035] S24. Add the core material droplets to the wall material solution, stir at 200-400 rpm at 30-35℃, then adjust the pH to 4.0-4.5 with 10% acetic acid by mass, and continue stirring for 30-40 minutes; finally, cool to 8-12℃ and add 10% glutaraldehyde solution by volume, and crosslink and cure at 100-200 rpm for 1-1.2 hours to obtain the collection capsule.

[0036] S25. Wash the filtered and collected capsules three times with deionized water and vacuum dry them at 60-70℃ for 2-3 hours to obtain self-healing microcapsules.

[0037] Preferably, the thin plate is wavy, and the line connecting the crests and troughs is perpendicular to the direction of the force, and the thickness of the thin plate gradually decreases from both ends to the middle.

[0038] In summary, the present invention has at least one of the following beneficial technical effects:

[0039] 1. This invention achieves the technical effect of dispersing stress and optimizing stress transmission path by using a corrugated thin plate with a combination of main holes and secondary holes. It solves the problem that thin plates are prone to cracking due to stress concentration when under stress, thereby improving the fatigue resistance of the thin plate and extending the overall service life of the device.

[0040] 2. This invention achieves the technical effect of automatically releasing repair fluid and filling cracks when cracks appear in thin plates by setting a self-healing capsule composed of specific material components. This solves the problem that thin plates are difficult to repair themselves after cracks occur and require frequent replacement, thereby reducing the maintenance cost of the device and enhancing its continuous use.

[0041] 3. By setting an arc surface at the edge of the main hole, the present invention achieves the technical effect of avoiding a sudden increase in local stress caused by right angles or acute angles, and solves the problem that the edge of the hole becomes a crack initiation point due to stress concentration, thereby improving the stability of the thin plate structure and enhancing its tear resistance. Attached Figure Description

[0042] Figure 1 This is a perspective view of the present invention;

[0043] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0044] Figure 3 This is a planar distribution diagram of the second release hole of the present invention;

[0045] Figure 4 This is a schematic diagram of the self-healing capsule of the present invention.

[0046] The components include: 1. Shell; 2. Thin plate; 3. Clamping plate; 4. Spring; 5. Paddle plate; 6. First release hole; 7. Second release hole; 8. Curved surface; 9. Protective layer; 10. Self-repairing capsule. Detailed Implementation

[0047] Example 1:

[0048] Please see the appendix Figure 1 - Appendix Figure 4 The present invention provides an elastomer having stress relief holes, comprising:

[0049] Shell 1, which serves as the main supporting structure, provides space for objects to fit into;

[0050] A thin plate 2 is disposed inside the housing 1, and a clamping plate 3 is fixed on the side away from the housing 1, which is used to deform the clamping plate 3 to change its position;

[0051] Spring 4 is located at the bottom of the clamping plate 3, and the end away from the clamping plate 3 is fixed to the housing 1. It is used to cooperate with the thin plate 2 to reset the clamping plate 3.

[0052] The lever 5 is fixed to the side of the clamping plate 3 away from the thin plate 2 to provide space for turning;

[0053] The first release hole 6 is opened inside the thin plate 2 to accommodate the large deformation generated by the thin plate 2 under stress and to quickly release the principal stress.

[0054] The second release hole 7 is opened inside the thin plate 2 to relieve secondary stress at the edge of the first release hole 6 and in the areas where stress concentration is likely to occur at the peaks and troughs of the thin plate 2.

[0055] The curved surface 8 is located at the position where the first relief hole 6 is opened in the thin plate 2, in order to avoid the concentrated stress generated by right angles and acute angles;

[0056] The protective component is located at the position where the second release hole 7 is opened in the thin plate 2, and is used to provide protection and self-healing capability when stress is generated;

[0057] The protective components include a protective layer 9 and a self-healing capsule 10. The protective layer 9 is filled with polytetrafluoroethylene and sprayed into the holes of the thin plate 2 where the second release hole 7 is opened.

[0058] The self-healing capsule 10 is installed in the housing 1 at the location where the second release hole 7 is opened;

[0059] The spraying steps for protective layer 9 include:

[0060] S11. The surface of the second release hole 7 is wiped clean with alcohol and dried. Then, a coating with a single thickness of 15-20μm is sprayed with a spray gun. The final design thickness of about 20μm is achieved through a single spraying operation. Then, it is dried at room temperature.

[0061] S12. Bake in an oven at 180-220℃ for 25-40 minutes to form a protective layer 9;

[0062] The self-healing capsule 10 includes a core material and a wall material;

[0063] The core material comprises the following components in parts by weight:

[0064] Bisphenol A epoxy resin, 60-70 parts;

[0065] Methylhexahydrophthalic anhydride, 25-30 parts;

[0066] Benzyl dimethylamine, 2-3 parts;

[0067] Nano calcium carbonate, 3-5 parts;

[0068] The wall material comprises the following components in parts by weight:

[0069] Pharmaceutical grade gelatin, 40-50 parts;

[0070] Gum arabic, 30-35 parts;

[0071] Polyvinyl alcohol, 10-15 parts;

[0072] Glycerin, 5-8 parts;

[0073] The preparation method of the self-repair capsule 10 includes the following steps:

[0074] S21. Take bisphenol A epoxy resin of type E-51 (epoxy value 0.48-0.54eq / 100g), add nano calcium carbonate, stir at high speed of 1500-2000rpm for 15-20 minutes, and then ultrasonically disperse at 200-300W for 10-15 minutes; add methyl hexahydrophthalic anhydride and benzyl dimethylamine in sequence, and stir at 400-600rpm for 5-7 minutes to obtain the core material repair solution.

[0075] S22. Take gelatin and gum arabic, add deionized water, heat and stir in a water bath at 60-70℃ until dissolved; then add polyvinyl alcohol and glycerin, stir continuously at 600-800 rpm for 20-30 minutes, and finally cool to 30-35℃ to obtain the wall material solution.

[0076] S23. Add the core material repair solution to cyclohexane and shear at a high speed of 2500-3500 rpm for 10 minutes to form uniform core material droplets.

[0077] S24. Add the core material droplets to the wall material solution and stir at 200-400 rpm at 30-35℃. Then adjust the pH to 4.0-4.5 with 10% acetic acid and continue stirring for 30-40 minutes. Finally, cool to 8-12℃ and add 10% glutaraldehyde solution, the amount of which is 20-25% of the total mass of the polymer materials (gelatin, gum arabic and polyvinyl alcohol) in the wall material. Crosslink and cure at 100-200 rpm for 1-1.2 hours to obtain the collection capsule.

[0078] S25. Wash the filtered and collected capsules three times with deionized water and vacuum dry them at 60-70℃ for 2-3 hours to obtain self-healing microcapsules.

[0079] The thin plate 2 is wavy, and the line connecting the crests and troughs is perpendicular to the direction of the force. The thickness of the thin plate 2 gradually decreases from both ends to the middle.

[0080] Specifically, the shell 1 is a hollow cuboid structure made of stainless steel, and its interior forms a space for installing components such as the thin plate 2, the clamping plate 3, and the spring 4.

[0081] The thin plate 2 has an overall wavy shape, with the line connecting the crests and troughs perpendicular to the direction of force applied during device operation. The thickness of the thin plate 2 gradually decreases from both ends to the middle, with a thickness of 3mm at both ends and a thickness of 1mm at the thinnest point in the middle. It is made of a super-elastic nickel-titanium alloy to ensure effective deformation under stress and good recovery performance.

[0082] The clamping plate 3 is a rectangular plate structure made of rigid plastic. Its width is the same as that of the thin plate 2. It is used to change position when the thin plate 2 deforms, thereby cooperating with the device to complete the clamping function of the incoming clamping block.

[0083] Spring 4 is made of high-strength spring steel. When the thin plate 2 deforms and causes the clamping plate 3 to move, spring 4 can generate a reverse elastic force, which, together with the restoring force of the thin plate 2, enables the clamping plate 3 to be reset.

[0084] The lever 5 has a sheet-like structure and is made of wear-resistant metal. The end of the lever 5 extends out of the housing 1 so that the user can easily touch and move it. This causes the locking plate 3 to be subjected to stress when it is moved, thus preventing it from engaging.

[0085] The first release hole 6 is located in the middle region of the thin plate 2 and is cylindrical. It is used to provide deformation space for the material of the thin plate 2 when the thin plate 2 is subjected to large deformation, so as to quickly release the principal stress and avoid damage to the thin plate 2 due to excessive principal stress.

[0086] The second release hole 7 is opened on the thin plate 2 and distributed on both sides of the first release hole 6. It includes branch holes extending obliquely from both sides of the first release hole 6. The diameter of the branch holes is 2mm. At the end of the branch holes away from the first release hole 6, there are micro holes with a diameter of 0.5mm, which are used to relieve secondary stress in areas such as the edges of the first release hole 6 and the peaks and troughs of the thin plate 2 where stress concentration is likely to occur.

[0087] The curved surface 8 replaces right angles and acute angles with an arc transition, avoiding stress concentration at the edge of the first release hole 6 and improving the structural stability of the thin plate 2 in the area around the first release hole 6.

[0088] The protective layer 9 is a modified polytetrafluoroethylene coating, which is sprayed inside the holes of the second release hole 7. Specifically, it covers the inner wall of the second release hole 7 and the contact area between the self-healing capsule 10 and the second release hole 7. The coating thickness is 20μm, which is used to protect the inner wall of the second release hole 7 and the self-healing capsule 10 and reduce the erosion of the external environment.

[0089] The self-repairing capsule 10 is distributed in the edge area of ​​the second release hole 7. It includes a core material and a wall material. The core material is composed of bisphenol A epoxy resin, methyl hexahydrophthalic anhydride, benzyl dimethylamine and nano calcium carbonate. The wall material is composed of pharmaceutical grade gelatin, gum arabic, polyvinyl alcohol and glycerin. When the edge of the second release hole 7 cracks due to stress, the wall material breaks and releases the repair fluid in the core material to fill the crack.

[0090] Example 2:

[0091] The core material includes: 60 parts of bisphenol A epoxy resin, 25 parts of methyl hexahydrophthalic anhydride, 2 parts of benzyl dimethylamine, and 3 parts of nano calcium carbonate.

[0092] The wall material includes: 40 parts pharmaceutical grade gelatin, 30 parts gum arabic, 10 parts polyvinyl alcohol, and 5 parts glycerin.

[0093] Preparation steps:

[0094] S21. Take bisphenol A epoxy resin, add nano calcium carbonate, stir at 1500 rpm for 15 minutes, and then ultrasonically disperse at 200W for 10 minutes; add methyl hexahydrophthalic anhydride and benzyl dimethylamine in sequence, stir at 400 rpm for 5 minutes to obtain core material repair solution.

[0095] S22. Take gelatin and gum arabic, add deionized water, heat and stir in a 60°C water bath until dissolved; then add polyvinyl alcohol and glycerin, stir continuously at 600 rpm for 20 minutes, and finally cool to 30°C to obtain the wall material solution.

[0096] S23. Add the core material repair solution to cyclohexane and shear at a high speed of 2500 rpm for 10 minutes to form uniform core material droplets.

[0097] S24. Add the core material droplets to the wall material solution, stir at 200 rpm at 30°C, then adjust the pH to 4.0 with 10% acetic acid and continue stirring for 30 minutes; finally, cool to 8°C and add 10% glutaraldehyde solution, then crosslink and cure at 100 rpm for 1 hour to obtain the collection capsule.

[0098] S25. Wash the filtered and collected capsules three times with deionized water and vacuum dry them at 60°C for 2 hours to obtain self-healing microcapsules.

[0099] Example 3:

[0100] The core material includes: 65 parts of bisphenol A epoxy resin, 27.5 parts of methyl hexahydrophthalic anhydride, 2.5 parts of benzyl dimethylamine, and 4 parts of nano calcium carbonate.

[0101] The wall material includes: 45 parts pharmaceutical grade gelatin, 37.5 parts gum arabic, 12.5 parts polyvinyl alcohol, and 6.5 parts glycerin.

[0102] Preparation steps:

[0103] S21. Take bisphenol A epoxy resin, add nano calcium carbonate, stir at 1750 rpm for 17 minutes, and then ultrasonically disperse at 250 W for 12 minutes; add methyl hexahydrophthalic anhydride and benzyl dimethylamine in sequence, stir at 500 rpm for 6 minutes to obtain the core material repair solution.

[0104] S22. Take gelatin and gum arabic, add deionized water, heat and stir in a 65°C water bath until dissolved; then add polyvinyl alcohol and glycerin, stir continuously at 700 rpm for 25 minutes, and finally cool to 32°C to obtain the wall material solution.

[0105] S23. Add the core material repair solution to cyclohexane and shear at a high speed of 3000 rpm for 10 minutes to form uniform core material droplets.

[0106] S24. Add the core material droplets to the wall material solution, stir at 300 rpm at 32°C, then adjust the pH to 4.2 with 10% acetic acid and continue stirring for 35 minutes; finally, cool to 10°C and add 10% glutaraldehyde solution, then crosslink and cure at 150 rpm for 1.1 hours to obtain the collection capsule.

[0107] S25. Wash the filtered and collected capsules three times with deionized water and vacuum dry them at 65°C for 2.5 hours to obtain self-healing microcapsules.

[0108] Example 4:

[0109] The core material includes: 70 parts of bisphenol A epoxy resin, 30 parts of methyl hexahydrophthalic anhydride, 3 parts of benzyl dimethylamine, and 5 parts of nano calcium carbonate.

[0110] The wall material includes: 50 parts pharmaceutical grade gelatin, 35 parts gum arabic, 15 parts polyvinyl alcohol, and 8 parts glycerin.

[0111] Preparation steps:

[0112] S21. Take bisphenol A epoxy resin, add nano calcium carbonate, stir at 2000 rpm for 20 minutes, and then ultrasonically disperse at 300W for 15 minutes; add methyl hexahydrophthalic anhydride and benzyl dimethylamine in sequence, stir at 600 rpm for 7 minutes to obtain core material repair solution.

[0113] S22. Take gelatin and gum arabic, add deionized water, heat and stir in a 70°C water bath until dissolved; then add polyvinyl alcohol and glycerin, stir continuously at 800 rpm for 30 minutes, and finally cool to 35°C to obtain the wall material solution.

[0114] S23. Add the core material repair solution to cyclohexane and shear at a high speed of 3500 rpm for 10 minutes to form uniform core material droplets.

[0115] S24. Add the core material droplets to the wall material solution, stir at 400 rpm at 35°C, then adjust the pH to 4.5 with 10% acetic acid and continue stirring for 40 minutes; finally, cool to 12°C and add 10% glutaraldehyde solution, then crosslink and cure at 200 rpm for 1.2 hours to obtain the collection capsule.

[0116] S25. Wash the filtered and collected capsules three times with deionized water and vacuum dry them at 70°C for 3 hours to obtain self-healing microcapsules.

[0117] Comparative Example 1:

[0118] Compared with Example 1, the difference is that the self-repair capsule is not set, that is, the self-repair capsule is not installed at the position where the second release hole 7 is opened on the thin plate 2, and the rest are the same.

[0119] Comparative Example 2:

[0120] Compared with Example 1, the difference is that the thin plate 2 is flat instead of wavy, and only one single hole is opened on the thin plate 2. There is no second release hole 7. Only a single hole with the same size as the first release hole 6 is retained. The edge of the single hole is right angled and no arc surface is provided. Everything else is the same.

[0121] Comparative Example 3:

[0122] Compared with Example 2 (material composition and preparation steps of self-repair capsule 10), the difference is that the core material of the self-repair capsule is only bisphenol A epoxy resin, without the addition of methyl hexahydrophthalic anhydride, benzyl dimethylamine and nano calcium carbonate, and the wall material is only pharmaceutical grade gelatin, without the addition of gum arabic, polyvinyl alcohol and glycerin, and the rest are the same.

[0123] Comparative Experiment 1:

[0124] Experimental subjects:

[0125] Comparative Example 1 of Example 1.

[0126] Experimental equipment:

[0127] Fatigue testing machine (range 0-100N, frequency adjustment range 1-50Hz), load sensor (accuracy ±0.1N), crack detection pen (detection accuracy 0.1mm).

[0128] Experimental steps:

[0129] The apparatus of Example 1 and the apparatus of Comparative Example 1 are respectively fixed on the fixture of the fatigue testing machine to ensure that the force direction of the thin plate 2 is consistent with the loading direction of the testing machine.

[0130] Test parameters: Alternating load 50N (loading force 50N, unloading force 0N), frequency 10Hz, continuous loading until a crack with a length ≥1mm appears on the thin plate 2.

[0131] Every 10 loads 4 In the next cycle, pause the test, use a crack detection pen to check the edge of the second release hole 7 on the thin plate 2, and record whether a crack appears and the length of the crack.

[0132] When the crack length reaches 1 mm, stop the test and record the total number of cycles at this point (see Table 1 for data details).

[0133] Table 1

[0134] Device type Number of cycles at which an initial microcrack (length < 0.5 mm) appears. Number of cycles at which obvious cracks (length ≥ 1 mm) appear Example 1 <![CDATA[5.8×10 4 Next <![CDATA[1.7×10 5 Next Comparative Example 1 <![CDATA[3.2×10 4 Next <![CDATA[8.3×10 4 Next

[0135] Summarize:

[0136] In Example 1, the self-healing capsules are distributed in the edge region of the second release hole 7. When the thin plate 2 is subjected to alternating load, microcracks are generated at the edge of the second release hole 7 due to stress concentration. The capsule wall material is deformed and breaks, and the released repair fluid solidifies at the crack, filling the crack gap and preventing further crack propagation. Therefore, in Example 1, the initial microcracks in the thin plate 2 appear later during cyclic loading, and more cycles are required for the crack to propagate to 1 mm.

[0137] In Comparative Example 1, no self-repairing capsule was provided, and the microcracks generated at the edge of the second release hole 7 could not be filled. Under the continuous action of alternating stress, the microcracks would continue to expand, causing the thin plate 2 to develop obvious cracks more quickly, and its fatigue resistance was lower than that of Example 1.

[0138] The self-repairing capsule extends the effective working time of the thin plate 2 under alternating loads by repairing cracks in a timely manner, thus improving the overall durability of the device.

[0139] Comparative Experiment 2:

[0140] Experimental subjects:

[0141] Example 1 vs. Comparative Example 2.

[0142] Experimental equipment:

[0143] Universal testing machine (loading range 0-200N, displacement accuracy ±0.01mm), stress and strain acquisition device (sampling frequency 1000Hz), data logger.

[0144] Experimental steps:

[0145] The apparatus of Example 1 and the apparatus of Comparative Example 2 were respectively installed on the upper and lower clamps of the universal testing machine to ensure that the force direction of the thin plate was coaxial with the loading axis of the testing machine.

[0146] Setting the loading program: Starting from 0N, load uniformly at a rate of 10N / min up to 100N, while simultaneously recording the stress distribution data and deformation of the thin plate surface through the stress-strain acquisition system.

[0147] Based on the collected data, the maximum stress concentration factor (the ratio of the maximum stress value to the average stress value) and the linear correlation coefficient between load and deformation of the thin plate are calculated.

[0148] Repeat the above test 3 times, and take the average of the 3 test results as the final data (see Table 2 for data details).

[0149] Table 2

[0150] Device type Maximum stress concentration factor <![CDATA[Linear correlation coefficient (R) between load and deformation 2 )]]> Example 1 1.8 0.986 Comparative Example 2 3.5 0.892

[0151] Summarize:

[0152] In Example 1, the thin plate 2 adopts a wave-shaped design. The structure of its crests and troughs can disperse some stress through its own deformation, reducing stress concentration. Simultaneously, the leaf-vein-shaped hole group composed of the first release hole 6 and the second release hole 7 can release the main stress through the main holes and guide secondary stress through the branch holes. Combined with the arc surface 8 at the hole edges, it avoids the sudden increase in local stress caused by right angles, resulting in a low maximum stress concentration coefficient. The synergistic effect of the wave-shaped structure and the leaf-vein-shaped hole group makes the deformation of the thin plate 2 uniform during the stress process, and the linear correlation coefficient between load and deformation is high.

[0153] Comparative Example 2 uses a flat, thin plate, which cannot disperse stress through structural deformation. Furthermore, the single-hole design lacks secondary stress dissipation channels, and the right angle at the hole edge causes stress to accumulate rapidly in that area, resulting in a higher maximum stress concentration factor than in Example 1. The combination of the flat, thin plate and the single-hole design leads to uneven deformation of the plate under stress, resulting in a low linear correlation coefficient between load and deformation.

[0154] The design of the corrugated thin plate and the leaf vein-like hole group achieves effective stress dispersion and conduction through structural optimization, reduces stress concentration, and improves linear stability in the force transmission process. This is its core advantage over the flat thin plate and single hole design.

[0155] Comparative Experiment 3:

[0156] Experimental subjects:

[0157] Example 2 vs. Comparative Example 3.

[0158] Experimental equipment:

[0159] Universal testing machine (loading range 0-500N, accuracy ±0.1N), crack measuring gauge (accuracy ±0.01mm), tensile testing fixture.

[0160] Experimental steps

[0161] In the devices of Example 2 and Comparative Example 3, a crack with a length of 0.5 mm and a width of 0.1 mm was pre-made at the edge of the second release hole of the thin plate to ensure that the position and shape of the crack were consistent.

[0162] Place both devices in an environment with a temperature of 25°C and a humidity of 50% for 24 hours to allow the self-repair capsule (if available) to complete the repair process.

[0163] The remaining area of ​​the crack is measured using a crack gauge, and the healing rate is calculated as ((initial crack area - remaining crack area) / initial crack area × 100%).

[0164] Samples of the thin plate containing the repaired area were taken and subjected to tear resistance testing using a universal testing machine at a loading rate of 50 mm / min. The tear resistance of the repaired area was recorded, and the ratio of its tear resistance to that of the un-cracked area was calculated (see Table 3 for data details).

[0165] Table 3

[0166] Device type Crack healing rate (%) Ratio of tear resistance of the repaired area to that of the uncracked area Example 1 87.6 0.81 Comparative Example 3 31.2 0.33

[0167] Summarize:

[0168] In the core material of the self-healing capsule 10 in Example 1, bisphenol A epoxy resin and methyl hexahydrophthalic anhydride undergo a curing reaction under the action of benzyl dimethylamine to form a cross-linked structure, in which nano-calcium carbonate is uniformly dispersed, improving the mechanical properties after curing. The composite film formed by gelatin and gum arabic in the wall material, combined with the stability of polyvinyl alcohol and the plasticizing properties of glycerin, ensures that the capsule releases the core material when cracks occur. The synergistic effect of these components allows the repair solution to effectively fill cracks and cure, forming a bond with a certain strength.

[0169] The core material of the self-repairing capsule in Comparative Example 3 contains only bisphenol A epoxy resin, lacking curing agents and accelerators, and cannot undergo cross-linking reaction. The repair fluid remains liquid and can only adhere to the crack surface in small amounts. The wall material contains only gelatin, resulting in insufficient membrane structure stability. Some capsules were damaged during the pre-cracking process, and the repair fluid was lost prematurely, leading to insufficient crack filling.

[0170] The material composition of the self-repairing capsule 10 ensures the curing effect and structural strength of the repair solution, enabling the repaired area to regain a certain degree of usability, an effect that single-component capsules cannot achieve.

Claims

1. An elastic body having stress relief holes, characterized in that, include: The shell (1) serves as the main support structure, providing space for the object to fit into; A thin plate (2) is disposed inside the housing (1) and a clamping plate (3) is fixed on the side away from the housing (1) for deforming to change the position of the clamping plate (3); Spring (4) is set at the bottom of the card plate (3) and the end away from the card plate (3) is fixed on the housing (1) to cooperate with the thin plate (2) to reset the card plate (3); A lever (5) is fixed to the side of the clamping plate (3) away from the thin plate (2) to provide space for turning; The first release hole (6) is opened inside the thin plate (2) to accommodate the deformation of the thin plate (2) when it is subjected to force and to quickly release the principal stress; The second release hole (7) is opened inside the thin plate (2) to relieve secondary stress at the edge of the first release hole (6) and in the areas where stress concentration is easily generated at the peaks and troughs of the thin plate (2). The arc surface (8) is set at the position where the first release hole (6) is opened in the thin plate (2) to avoid the concentrated stress generated by right angles and acute angles; A protective component is provided at the location where a second release hole (7) is provided on the thin plate (2) to provide protection and self-healing capability when stress is generated; The protective component includes a protective layer (9) and a self-healing capsule (10), wherein the protective layer (9) is a modified polytetrafluoroethylene coating; The self-healing capsule (10) is installed in the shell (1) at the location where the second release hole (7) is opened; The protective layer (9) is sprayed on the inner wall of the second release hole (7) and the contact area between the self-repairing capsule (10) and the second release hole (7); The thin plate (2) is arranged in a wave shape, and the line connecting the crest and trough is perpendicular to the direction of the force, and the thickness of the thin plate (2) gradually decreases from both ends to the middle. The diameter of the second release hole (7) gradually decreases from the outside to the inside, forming a stress gradient dredging structure.

2. An elastic body with stress relief holes according to claim 1, characterized in that, The spraying steps for the protective layer (9) include: S11. The surface of the second release hole (7) is wiped clean with alcohol, dried, and then coated with a coating of 15-20μm thickness in a single application using a spray gun. It is then dried at room temperature. S12. Bake in an oven at 180-220℃ for 25-40 minutes to form a protective layer (9).

3. An elastic body with stress relief holes according to claim 1, characterized in that, The self-healing capsule (10) includes a core material and a wall material; The core material comprises the following components in parts by weight: Bisphenol A epoxy resin, 60-70 parts; Methylhexahydrophthalic anhydride, 25-30 parts; Benzyl dimethylamine, 2-3 parts; Nano calcium carbonate, 3-5 parts; The wall material comprises the following components in parts by weight: Pharmaceutical grade gelatin, 40-50 parts; Gum arabic, 30-35 parts; Polyvinyl alcohol, 10-15 parts; Glycerin, 5-8 parts.

4. An elastic body with stress relief holes according to claim 1, characterized in that, The preparation method of the self-repairing capsule (10) includes the following steps: S21. Take bisphenol A epoxy resin, add nano calcium carbonate, stir at high speed of 1500-2000 rpm for 15-20 minutes, and then ultrasonically disperse at 200-300W for 10-15 minutes; add methyl hexahydrophthalic anhydride and benzyl dimethylamine in sequence, and stir at 400-600 rpm for 5-7 minutes to obtain the core material repair solution. S22. Take gelatin and gum arabic, add deionized water, heat and stir in a water bath at 60-70℃ until dissolved; then add polyvinyl alcohol and glycerin, stir continuously at 600-800 rpm for 20-30 minutes, and finally cool to 30-35℃ to obtain the wall material solution. S23. Add the core material repair solution to cyclohexane and shear at a high speed of 2500-3500 rpm for 10 minutes to form uniform core material droplets. S24. Add the core material droplets to the wall material solution, stir at 200-400 rpm at 30-35℃, then adjust the pH to 4.0-4.5 with 10% acetic acid by mass, and continue stirring for 30-40 minutes; finally, cool to 8-12℃ and add 10% glutaraldehyde solution by volume, and crosslink and cure at 100-200 rpm for 1-1.2 hours to obtain the collection capsule; S25. Wash the filtered capsules three times with deionized water and vacuum dry them at 60-70℃ for 2-3 hours to obtain self-healing microcapsules.

5. An elastic body with stress relief holes according to claim 4, characterized in that, In step S21, the particle size of the nano-calcium carbonate is 20-100 nm; In step S22, the molecular weight of the polyvinyl alcohol is 13,000-23,000.

6. An elastic body with stress relief holes according to claim 4, characterized in that, In step S25, the filtered collection capsule is filtered using a microporous membrane with a pore size of 0.5-2 μm.

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