Elastomer with stress release holes

Abstract

The invention relates to the field of elastomers, and discloses an elastomer with a stress release hole, which comprises a shell, a thin plate; the spring is arranged at the bottom of the clamping plate, and the end, away from the clamping plate, of the spring is fixed to the shell and used for being matched with the thin plate to reset the clamping plate. The shifting plate is fixed to the side, away from the thin plate, of the clamping plate and used for providing a shifting space; the first release hole is formed in the thin plate and used for accommodating large deformation generated when the thin plate is stressed and quickly releasing main stress; and the second release hole is formed in the thin plate and used for dredging secondary stress of the edge of the first release hole and areas where stress concentration is prone to being generated at wave crests and wave troughs of the thin plate. Through the combined design of the wave-shaped thin plate and the main holes and the auxiliary holes, the technical effects of dispersing stress and optimizing a stress transmission path are achieved, the problem that cracks are easily generated due to stress concentration when the thin plate is stressed is solved, the anti-fatigue performance of the thin plate is improved, and the overall service life of the device is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of elastomers, in particular to an elastomer provided with stress release holes. BACKGROUND

[0002] In the prior art, elastomers are widely used in various types of lock devices as core components for switching between locked and unlocked states due to their ability to recover from deformation. In simple buckle structures, the elastomer is usually connected to a dial mechanism. When an external force is applied to deform the elastomer, it can displace the lock tongue or lock groove of the buckle, thereby completing the locking or unlocking action. Common elastomers are mostly flat plate structures, some of which have a single circular hole on the surface to meet the deformation requirements. The materials used are mainly spring steel and high-elasticity plastic, which ensure the stability of the buckle state through their elastic restoring force.

[0003] With the increasing application of lock devices in scenarios that require frequent state switching, the service life and reliability of the elastomer have become a focus of attention. During repeated deformation under stress, the edges of the circular hole on the surface of the flat plate elastomer tend to concentrate stress, especially at the right angle or acute angle parts of the circular hole. Over time, micro-cracks may appear and gradually expand, leading to the failure of the elastomer. At the same time, the single circular hole design is insufficient in relieving secondary stress generated during deformation, resulting in poor deformation uniformity of the elastomer, affecting the accuracy of state switching of the buckle, and increasing the maintenance frequency of the lock device. SUMMARY

[0004] The purpose of the present application is to provide an elastomer provided with stress release holes, which solves the problems of easy breakage due to stress concentration, poor deformation uniformity, and high maintenance frequency of the existing elastomer in lock devices.

[0005] To achieve the above purpose, the present application is implemented by the following technical solutions:

[0006] An elastomer provided with stress release holes, comprising:

[0007] A housing serving as a bearing body for providing a space for objects to fit in;

[0008] A thin plate arranged inside the housing and having a clamping plate fixed on the side away from the housing for generating deformation to change the position of the clamping plate;

[0009] A spring arranged at the bottom of the clamping plate and fixed on the housing at the end away from the clamping plate for resetting the clamping plate in cooperation with the thin plate;

[0010] A dial plate fixed on the side of the clamping plate away from the thin plate for providing a dialing space;

[0011] A first release hole is formed in the sheet for accommodating large deformation of the sheet under stress, and quickly releasing the main stress;

[0012] A second release hole is formed in the sheet for leading the secondary stress of the stress concentration area of the edge of the first release hole and the wave crest and wave trough of the sheet;

[0013] An arc surface is arranged at the position of the sheet where the first release hole is formed, for avoiding the concentrated stress generated by the right angle and acute angle;

[0014] A protection assembly is arranged at the position of the sheet where the second release hole is formed, for providing protection and self-repairing ability when stress is generated.

[0015] Preferably, the protection assembly comprises a protective layer and a self-repairing capsule, the protective layer is filled with polytetrafluoroethylene and sprayed in the hole of the sheet where the second release hole is formed;

[0016] The self-repairing capsule is installed at the position of the shell where the second release hole is formed.

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

[0018] S11, the surface of the second release hole is cleaned with alcohol, and after drying, a coating with a single thickness of 15-20 μm is sprayed by a spray gun, and then dried at room temperature.

[0019] S12, put into an oven at 180-220℃ and bake for 25-40 minutes to form a protective layer.

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

[0021] The core material comprises the following component materials in mass fraction:

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

[0023] Methyl hexahydrophthalic anhydride, 25-30 parts;

[0024] Benzyl dimethylamine, 2-3 parts;

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

[0026] The wall material comprises the following component materials in mass fraction:

[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 comprises the following steps:

[0032] S21, taking bisphenol A epoxy resin, adding nano calcium carbonate, high-speed stirring at a speed of 1500-2000 rpm for 15-20 minutes, and ultrasonic dispersion at a power of 200-300 W for 10-15 minutes; sequentially adding methyl hexahydrophthalic anhydride and benzyl dimethylamine, and stirring at a speed of 400-600 rpm for 5-7 minutes to obtain a core material repairing solution.

[0033] S22, taking gelatin and gum arabic, adding deionized water, and heating and stirring in a water bath at 60-70°C until dissolved; then adding polyvinyl alcohol and glycerin, and continuously stirring at a speed of 600-800 rpm for 20-30 minutes, and finally cooling to 30-35°C to obtain a wall material solution.

[0034] S23, adding the core material repairing solution into cyclohexane, and high-speed shearing at a speed of 2500-3500 rpm for 10 minutes to form uniform core material droplets.

[0035] S24, adding the core material droplets into the wall material solution, stirring at a speed of 200-400 rpm at 30-35°C, adjusting the pH to 4.0-4.5 using 10% acetic acid by mass fraction, and continuously stirring for 30-40 minutes; finally, cooling to 8-12°C and adding 10% glutaraldehyde solution by volume fraction, and crosslinking and curing at 100-200 rpm for 1-1.2 hours to obtain collected capsules.

[0036] S25, washing the collected capsules with deionized water for 3 times, and vacuum drying at 60-70°C for 2-3 hours to obtain self-repairing microcapsules.

[0037] Preferably, the thin plate is arranged in a wave shape, and the connecting line direction of the wave crest and the wave trough is perpendicular to the stress direction, and the thickness of the thin plate gradually decreases from both ends to the middle.

[0038] In summary, the present application has the following at least one beneficial technical effect:

[0039] 1. The present application achieves the technical effects of dispersing stress and optimizing stress transmission path through the combination design of the wave-shaped thin plate and the main hole and the auxiliary hole, solves the problem that the thin plate is easy to produce 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.

[0040] 1. The present application achieves the technical effects of dispersing stress and optimizing stress transmission path through the combination design of the wave-shaped thin plate and the main hole and the auxiliary hole, solves the problem that the thin plate is easy to produce 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.2. The application achieves the technical effect of automatically releasing repair liquid and filling the cracks when the sheet appears cracks by setting the self-repairing capsule composed of specific material components, solves the problem of difficult self-repairing of sheet cracks and frequent replacement, reduces the device maintenance cost and enhances the use continuity.

[0041] 3. The application achieves the technical effect of avoiding the sudden increase of local stress caused by right angle or acute angle by setting the camber surface at the edge of the main hole, solves the problem of hole edge becoming the crack initiation point due to stress concentration, improves the stability of sheet structure and enhances the tear resistance. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a perspective view of the application;

[0043] Figure 2 is Figure 1 is an enlarged view of A in the middle;

[0044] Figure 3 is a second release hole plan view of the application;

[0045] Figure 4 is a schematic view of the self-repairing capsule of the application.

[0046] Wherein, 1, shell; 2, sheet; 3, clamping plate; 4, spring; 5, push plate; 6, first release hole; 7, second release hole; 8, camber surface; 9, protective layer; 10, self-repairing capsule. DETAILED DESCRIPTION

[0047] Example 1:

[0048] Please refer to the attached Figure 1 - attached Figure 4 , the application provides an elastomer provided with stress release holes, comprising:

[0049] The shell 1 serves as a bearing main body and provides a space for the object to be embedded;

[0050] The sheet 2 is arranged inside the shell 1 and is fixed with the clamping plate 3 on the side away from the shell 1, so as to generate deformation to change the position of the clamping plate 3;

[0051] The spring 4 is arranged at the bottom of the clamping plate 3 and is fixed on the shell 1 at the end away from the clamping plate 3, so as to reset the clamping plate 3 in cooperation with the sheet 2;

[0052] The push plate 5 is fixed on the side of the clamping plate 3 away from the sheet 2, so as to provide a space for pushing;

[0053] The first release hole 6 is arranged inside the sheet 2, so as to accommodate the large deformation of the sheet 2 under stress and quickly release the main stress;

[0054] A second release hole 7 is formed in the sheet 2 for relieving the secondary stress at the edge of the first release hole 6 and the stress concentration area of the sheet 2 at the wave crest and wave trough;

[0055] An arc surface 8 is arranged at the position of the sheet 2 where the first release hole 6 is formed, for avoiding the concentrated stress caused by right angle and acute angle;

[0056] A protective assembly is arranged at the position of the sheet 2 where the second release hole 7 is formed, for providing protection and self-repairing ability when stress is generated;

[0057] The protective assembly includes a protective layer 9 and a self-repairing capsule 10, the protective layer 9 is filled with polytetrafluoroethylene and sprayed in the hole of the sheet 2 where the second release hole 7 is formed;

[0058] The self-repairing capsule 10 is installed at the position of the shell 1 where the second release hole 7 is formed;

[0059] The spraying step of the protective layer 9 includes:

[0060] S11, the surface of the second release hole 7 is cleaned with alcohol, and after drying, a coating with a single thickness of 15-20 μm is sprayed by a spray gun, the final design thickness of about 20 μm is achieved by a single spraying operation, and then the room temperature is dried.

[0061] S12, put into the oven at 180-220℃ for 25-40 minutes to form the protective layer 9;

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

[0063] The core material includes the following component materials in mass fraction:

[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 includes the following component materials in mass fraction:

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

[0070] Gum arabic, 30-35 parts;

[0071] Polyvinyl alcohol, 10-15 parts;

[0072] Glycerol, 5-8 parts;

[0073] The preparation method of the self-repairing capsule 10 comprises the following steps:

[0074] S21, taking bisphenol A epoxy resin (epoxy value is 0.48-0.54 eq / 100g) of model E-51, adding nano calcium carbonate, high-speed stirring at a speed of 1500-2000 rpm for 15-20 minutes, and ultrasonic dispersion at a power of 200-300 W for 10-15 minutes; sequentially adding methyl hexahydrophthalic anhydride and benzyl dimethylamine, and stirring at a speed of 400-600 rpm for 5-7 minutes to obtain a core material repair solution.

[0075] S22, taking gelatin and gum arabic, adding deionized water, and heating and stirring in a water bath at 60-70 DEG C until dissolved; then adding polyvinyl alcohol and glycerol, and continuously stirring at a speed of 600-800 rpm for 20-30 minutes; finally cooling to 30-35 DEG C to obtain a wall material solution.

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

[0077] S24, adding the core material droplets into the wall material solution, stirring at a speed of 200-400 rpm at 30-35 DEG C, and then adjusting the pH to 4.0-4.5 by using 10% acetic acid, and continuously stirring for 30-40 minutes; finally, cooling to 8-12 DEG C, and adding 10% glutaraldehyde solution with an amount of 20-25% of the total mass of the high molecular materials (gelatin, gum arabic and polyvinyl alcohol) in the wall material, and crosslinking and curing at 100-200 rpm for 1-1.2 hours to obtain collected capsules.

[0078] S25, washing the collected capsules with deionized water for 3 times, and vacuum drying at 60-70 DEG C for 2-3 hours to obtain self-repairing microcapsules.

[0079] The thin plate 2 is arranged in a wave shape, and the connecting line direction of the wave crest and the wave trough is perpendicular to the stress direction, and 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 forms an accommodating space inside for mounting components such as the thin plate 2, the clamping plate 3, the spring 4, etc.

[0081] The thin plate 2 is in a wave shape as a whole, and the connecting line direction of the wave crest and the wave trough is perpendicular to the stress direction during device operation. The thickness of the thin plate 2 gradually decreases from both ends to the middle, and the thickness of both ends is 3 mm, and the thinnest part in the middle is 1 mm, and it is made of super-elastic nickel-titanium alloy material to ensure effective deformation under stress and good recovery performance.

[0082] The card plate 3 is a rectangular plate structure, made of hard plastic material, with a width consistent with that of the sheet 2, for changing position when the sheet 2 deforms, and then cooperating with the device to complete the clamping effect on the incoming card block

[0083] The spring 4 is made of high-strength spring steel material, which can generate a reverse spring force after the sheet 2 deforms and drives the card plate 3 to move, and cooperate with the restoring force of the sheet 2 to realize the resetting of the card plate 3.

[0084] The push plate 5 is a sheet structure made of wear-resistant metal material, with the end of the push plate 5 extending out of the shell 1, which can be easily touched and pushed by the user, so that the card plate 3 is stressed and cannot be clamped.

[0085] The first release hole 6 is provided in the middle region of the sheet 2 and is in a cylindrical shape, for providing deformation space for the material of the sheet 2 when the sheet 2 is stressed to produce large deformation, quickly releasing the main stress, and avoiding damage to the sheet 2 due to excessive main stress.

[0086] The second release hole 7 is provided on the sheet 2 and is distributed on both sides of the first release hole 6, which includes branch holes extending obliquely from both sides of the first release hole 6, with a hole diameter of 2 mm, and a micro-hole provided at the end of the branch hole away from the first release hole 6, with a hole diameter of 0.5 mm, for dredging the secondary stress of the edge of the first release hole 6 and the stress concentration areas such as the wave crest and trough of the sheet 2.

[0087] The camber surface 8 replaces the right angle and acute angle through arc transition, avoiding stress concentration at the edge of the first release hole 6 and improving the structural stability of the sheet 2 in the area around the first release hole 6.

[0088] The protective layer 9 is a modified polytetrafluoroethylene coating, sprayed in the hole of the second release hole 7, specifically covering 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, with a coating thickness of 20 μm, for protecting the inner wall of the second release hole 7 and the self-repairing capsule 10 and reducing the erosion of the external environment.

[0089] The self-repairing capsule 10 is distributed in the edge region of the second release hole 7, which includes core material and wall material, the core material is composed of bisphenol A epoxy resin, methyl hexahydrophthalic anhydride, benzyl dimethyl amine and nano calcium carbonate, and the wall material is composed of pharmaceutical grade gelatin, gum arabic, polyvinyl alcohol and glycerol, when the edge of the second release hole 7 cracks due to stress, the wall material breaks, releasing the repair liquid in the core material to fill the cracks.

[0090] Example 2:

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

[0092] The wall material comprises: pharmaceutical grade gelatin 40 parts, acacia 30 parts, polyvinyl alcohol 10 parts, and glycerol 5 parts.

[0093] Preparation steps:

[0094] S21, take the bisphenol A epoxy resin, add nano calcium carbonate, high-speed stirring at 1500 rpm for 15 minutes, and then ultrasonic dispersion at 200 W for 10 minutes; sequentially add methyl hexahydrophthalic anhydride and benzyl dimethylamine, and stir at 400 rpm for 5 minutes to obtain a core material repair solution.

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

[0096] S23, add the core material repair solution to cyclohexane, and high-speed shear at 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, and then adjust the pH to 4.0 using 10% acetic acid by mass fraction, and continuously stir for 30 minutes; finally, cool to 8°C and add 10% glutaraldehyde solution by volume fraction, and crosslink and solidify at 100 rpm for 1 hour to obtain collected capsules.

[0098] S25, wash the filtered collected capsules with deionized water 3 times, and vacuum dry at 60°C for 2 hours to obtain self-repairing microcapsules.

[0099] Example 3:

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

[0101] The wall material comprises: pharmaceutical grade gelatin 45 parts, acacia 37.5 parts, polyvinyl alcohol 12.5 parts, and glycerol 6.5 parts.

[0102] Preparation steps:

[0103] S21, take the bisphenol A epoxy resin, add nano calcium carbonate, high-speed stirring at 1750 rpm for 17 minutes, and then ultrasonic dispersion at 250 W for 12 minutes; sequentially add methyl hexahydrophthalic anhydride and benzyl dimethylamine, and stir at 500 rpm for 6 minutes to obtain a core material repair solution.

[0104] S22, take gelatin, gum arabic, add deionized water, heated to dissolve with 65℃ water bath stirring; then add polyvinyl alcohol, glycerol, continue to stir at 700 rpm for 25 minutes, finally cooled to 32℃, get wall material solution.

[0105] S23, the core material repair solution is added to cyclohexane, and high-speed shearing is carried out at a speed of 3000 rpm for 10 minutes to form uniform core material droplets.

[0106] S24, the core material droplets are added to the wall material solution, stirred at a speed of 300 rpm at 32℃, and then the pH is adjusted to 4.2 by using 10% acetic acid, and the stirring is continued for 35 minutes; finally, after cooling to 10℃, 10% glutaraldehyde solution is added, and crosslinking and solidification are carried out at 150 rpm for 1.1 hours to obtain collected capsules.

[0107] S25, the collected capsules are washed with deionized water for 3 times, and vacuum dried at 65℃ for 2.5 hours to obtain self-repairing microcapsules.

[0108] Example 4:

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

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

[0111] Preparation steps:

[0112] S21, take bisphenol A epoxy resin, add nano calcium carbonate, high-speed stirring at a speed of 2000 rpm for 20 minutes, then ultrasonic dispersion at a power of 300 W for 15 minutes; methyl hexahydrophthalic anhydride, benzyl dimethylamine are added in turn, and stirring is carried out at a speed of 600 rpm for 7 minutes to obtain core material repair solution.

[0113] S22, take gelatin, gum arabic, add deionized water, heated to dissolve with 70℃ water bath stirring; then add polyvinyl alcohol, glycerol, continue to stir at 800 rpm for 30 minutes, finally cooled to 35℃, get wall material solution.

[0114] S23, the core material repair solution is added to cyclohexane, and high-speed shearing is carried out at a speed of 3500 rpm for 10 minutes to form uniform core material droplets.

[0115] S24, the core material droplets are added into the wall material solution, stirring at 35℃ and 400rpm, adjusting pH to 4.5 with 10% acetic acid, and continuing stirring for 40 minutes; finally, cooling to 12℃, adding 10% glutaraldehyde solution, and cross-linking and curing at 200rpm for 1.2 hours to obtain the collected capsules.

[0116] S25, the collected capsules are washed with deionized water for 3 times, and vacuum dried at 70℃ for 3 hours to obtain the self-repairing microcapsules.

[0117] Comparative Example 1:

[0118] Compared with Example 1, the difference is that no self-repairing capsules are arranged, i.e. the position of the second release hole 7 of the thin plate 2 is not installed with the self-repairing capsules, 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, not wavy, and only one single hole is opened on the thin plate 2, without the second release hole 7, only retaining the single hole with the same size as the first release hole 6, and the edge of the single hole is a right angle without setting an arc surface, and the rest are the same.

[0121] Comparative Example 3:

[0122] Compared with Example 2 (material components and preparation steps of the self-repairing capsules 10), the difference is that the core material of the self-repairing capsules only uses bisphenol A epoxy resin, without adding methylhexahydrophthalic anhydride, benzyl dimethylamine and nano calcium carbonate, and the wall material only uses pharmaceutical grade gelatin, without adding gum arabic, polyvinyl alcohol and glycerol, and the rest are the same.

[0123] Comparative Experiment 1:

[0124] Experimental object:

[0125] Example 1 VS Comparative 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 device of Example 1 and the device of Comparative Example 1 are respectively fixed on the fixture of the fatigue testing machine, to ensure that the stress 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, continue loading until the length of crack on the thin plate 2 is greater than or equal to 1mm.

[0131] Every 10 4 times of loading, pause the test, use the crack detection pen to detect 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 length of the crack reaches 1mm, stop the test and record the total number of cycles at this time (see Table 1 for details).

[0133] Table 1

[0134] Device type Number of cycles to initial microcrack (length < 0.5 mm) Number of cycles to macrocrack (length > 1 mm) Example 1 5.8 x 10 4 subsequent 1.7 x 10 5 subsequent Comparative Example 1 3.2 x 10 4 subsequent 8.3 x 10 4 secondary

[0135] Summary:

[0136] In Example 1, the self-repairing capsules are distributed in the edge area of the second release hole 7. When the edge of the second release hole 7 produces micro-cracks due to stress concentration under alternating load, the capsule wall material breaks under the action of deformation, and the released repair liquid solidifies at the crack, filling the crack gap and preventing further expansion of the crack. Therefore, the thin plate 2 of Example 1 has a later initial micro-crack appearance time and a greater number of cycles required for the crack to expand to 1mm during the cyclic loading process.

[0137] Comparative Example 1 does not have self-repairing capsules, and the micro-cracks produced at the edge of the second release hole 7 cannot be filled. Under the continuous action of alternating stress, the micro-cracks will continue to expand, resulting in the thin plate 2 appearing obvious cracks faster, and its fatigue resistance being lower than that of Example 1.

[0138] The setting of self-repairing capsules prolongs the effective working time of the thin plate 2 under alternating load by timely repairing the cracks, and improves the overall durability of the device.

[0139] Comparative Experiment 2:

[0140] Experimental object:

[0141] Example 1 vs. Comparative Example 2.

[0142] Experimental equipment:

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

[0144] Experimental steps:

[0145] The device of Example 1 and the device of Comparative Example 2 are respectively installed on the upper and lower clamps of the universal testing machine, ensuring that the stress direction of the thin plate is coaxial with the loading axis of the testing machine.

[0146] Loading procedure: from 0 N to 100 N at a rate of 10 N / min, and the stress distribution data of the surface of the sheet and the deformation of the sheet were recorded synchronously by the stress-strain collection system.

[0147] According to the collected data, the maximum stress concentration coefficient (the ratio of the maximum stress value to the average stress value) of the sheet and the linear correlation coefficient of the load and the deformation were calculated.

[0148] The above test was repeated three times, and the average of the three test results was taken as the final data (see Table 2 for details).

[0149] Table 2

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

[0151] Summary:

[0152] In Example 1, the sheet 2 adopts a wave shape design, and the structure of the wave crest and the wave trough can disperse part of the stress through its own deformation, reducing stress concentration. At the same time, 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 hole, guide the secondary stress through the branch hole, and cooperate with the arc surface 8 at the edge of the hole to transition, avoiding the sudden increase of local stress caused by the right angle, so that the maximum stress concentration coefficient is low. The synergistic effect of the wave shape structure and the leaf vein-shaped hole group makes the deformation of the sheet 2 more uniform during the stress process, and the linear correlation coefficient of the load and the deformation is higher.

[0153] The flat sheet in Comparative Example 2 cannot disperse stress through structural deformation, and the design of a single large hole lacks secondary stress guiding channels. The right angle at the edge of the hole will cause stress to accumulate sharply in this area, resulting in a maximum stress concentration coefficient higher than that of Example 1. The combination of a flat sheet and a single hole design results in uneven deformation of the sheet when stressed, and the linear correlation coefficient of the load and the deformation is lower.

[0154] The design of the wave-shaped sheet and the leaf vein-shaped hole group achieves effective dispersion and guidance of stress through structural optimization, reduces the degree of stress concentration, and improves the linear stability in the force transmission process, which is the core advantage of the wave-shaped sheet and the leaf vein-shaped hole group compared to the flat sheet and the single hole design.

[0155] Comparative Experiment 3:

[0156] Experimental object:

[0157] Example 2 vs. Comparative Example 3.

[0158] Experimental equipment:

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

[0160] Experimental procedure

[0161] In the device 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-prepared at the edge of the second release hole of the sheet, and the position and shape of the crack were ensured to be consistent.

[0162] The two devices were placed in an environment with a temperature of 25°C and a humidity of 50% for 24 hours to allow the self-repairing capsules (if any) to complete the repair process.

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

[0164] The sheet containing the repaired area was sampled, and a tear resistance test was performed on a universal material testing machine at a loading rate of 50 mm / min. The tear resistance strength of the repaired area was recorded, and the ratio of the tear resistance strength of the repaired area to the tear resistance strength of the uncracked area was calculated (see Table 3 for details).

[0165] Table 3

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

[0167] Summary:

[0168] In the self-repairing capsule 10 of Example 1, the bisphenol A epoxy resin and methylhexahydrophthalic anhydride undergo a curing reaction under the action of benzyl dimethylamine to form a cross-linked structure, and the nano-calcium carbonate is uniformly dispersed therein to improve the mechanical properties of the cured material. The composite film formed by gelatin and gum arabic in the wall material, combined with the stability of polyvinyl alcohol and the plasticity of glycerol, ensures that the capsule releases the core material when a crack occurs. The synergistic effect of these components enables the repair liquid to effectively fill the crack and solidify to form a combination with certain strength.

[0169] The self-repairing capsule of Comparative Example 3 contains only bisphenol A epoxy resin in the core material, lacking a curing agent and accelerator, and cannot undergo cross-linking reaction. The repair liquid remains liquid at all times and can only adhere to the surface of the crack in small amounts; the wall material contains only gelatin, and the film structure lacks stability, and some capsules have been damaged during the pre-cracking process, resulting in early loss of repair liquid and insufficient crack filling.

[0170] The material composition of the self-repairing capsule 10 ensures the curing effect and structural strength of the repair liquid, allowing the repair area to recover some of its use performance, while a single-component capsule cannot achieve this effect.

Claims

1. An elastomeric body provided with stress relief holes, characterized in that, The utility model relates to a kind of self-repairing thin plate and self-repairing thin plate, including: Shell (1) is used as carrying body, for providing the space that object is embedded into; Thin plate (2) is arranged inside shell (1), and card board (3) is fixed on the side away from shell (1), for generating deformation to change the position of card board (3); Spring (4) is arranged at the bottom of card board (3), and is fixed on shell (1) at the end away from card board (3), for resetting card board (3) with thin plate (2); Dial plate (5) is fixed on the side of card board (3) away from thin plate (2), for providing dialing space; First release hole (6) is opened in thin plate (2), for accommodating the larger deformation of thin plate (2) when stressed, quickly releasing main stress; Second release hole (7) is opened in thin plate (2), for guiding secondary stress in stress concentration area of first release hole (6) edge and thin plate (2) wave crest and wave trough; Camber (8) is arranged at the position of thin plate (2) opening first release hole (6), for avoiding concentrated stress generated by right angle and acute angle; Protective component is arranged at the position of thin plate (2) opening second release hole (7), for providing protection and self-repairing ability when stress is generated.

2. An elastomeric body provided with stress relief holes according to claim 1, characterized in that, The protective component includes a protective layer (9) and a self-repairing capsule (10), the protective layer (9) is a modified polytetrafluoroethylene coating; The self-repairing capsule (10) is installed at the position of the shell (1) opening the second release hole (7).

3. An elastomeric body provided with stress relief holes according to claim 2, characterized in that, 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).

4. An elastomeric body provided with stress relief holes according to claim 2, characterized in that, The spraying step of the protective layer (9) includes: S11, the surface of the second release hole (7) is wiped clean with alcohol, and after drying, a coating with a single thickness of 15-20 μm is sprayed using a spray gun, and then air-dried at room temperature; S12, place in an oven at 180-220℃ for 25-40 minutes to form the protective layer (9).

5. An elastomeric body provided with stress relief holes as claimed in claim 2 wherein, The self-repairing capsule (10) includes a core material and a wall material; The core material includes the following component materials in mass fraction: Bisphenol A epoxy resin, 60-70 parts; Methylhexahydrophthalic anhydride, 25-30 parts; Benzyl dimethyl amine, 2-3 parts; Nano calcium carbonate, 3-5 parts; The wall material includes the following component materials in mass fraction: Pharmaceutical grade gelatin, 40-50 parts; Gum arabic, 30-35 parts; Polyvinyl alcohol, 10-15 parts; Glycerol, 5-8 parts.

6. An elastomeric body provided with stress relief holes according to claim 2, 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, high-speed stir at 1500-2000 rpm for 15-20 minutes, and ultrasonic dispersion at 200-300 W power for 10-15 minutes;Methylhexahydrophthalic anhydride, benzyl dimethyl amine are added in turn, and stirred at 400-600 rpm for 5-7 minutes to obtain a core material repair solution. S22, taking gelatin, gum arabic, adding deionized water, heating and stirring in 60-70 DEG C water bath until dissolved; then add polyvinyl alcohol, glycerol, continue to stir at 600-800 rpm for 20-30 minutes, finally cooled to 30-35 DEG C, to obtain the wall material solution; S23, the core material repair liquid is added to cyclohexane, high speed shearing at 2500-3500 rpm for 10 minutes, forming uniform core material droplets; S24, the core material droplets are added to the wall material solution, stirring at 30-35 DEG C, 200-400 rpm, then adjust the pH to 4.0-4.5 with 10% acetic acid, continue to stir for 30-40 minutes; finally, cooling to 8-12 DEG C, adding 10% glutaraldehyde solution, crosslinking and curing at 100-200 rpm for 1-1.2 hours, to obtain the collection capsule; S25, the collected capsule after filtration is washed with deionized water for 3 times, and vacuum dried at 60-70 DEG C for 2-3 hours, to obtain the self-repairing microcapsule.

7. An elastomeric body provided with stress relief holes according to claim 6, 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 13000-23000.

8. An elastomeric body provided with stress relief holes according to claim 6, characterized in that, In step S25, the collected capsule after filtration is filtered by using a microporous filter membrane with a pore size of 0.5-2 μm.

9. An elastomeric body provided with stress relief holes according to claim 1, characterized in that, The thin plate (2) is arranged in a wave shape, and the connecting line direction of the wave crest and the wave trough is perpendicular to the stress direction, and the thickness of the thin plate (2) gradually shrinks from both ends to the middle.

10. An elastomeric body provided with stress relief holes as claimed in claim 1 wherein, The second release hole (7) has a gradually reduced hole diameter from the outside to the inside, forming a stress gradient guiding structure.

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