Method for testing the strength characteristics of solid materials and their connections under stress

Abstract

The present invention relates to the technical field of strength detection of solid materials and their connection, and provides a method for detecting the strength characteristics of solid materials and their connection under stress, including a stress distribution detection method based on a three-layer composite structure, a stress distribution detection method based on a special detection tape, and a sealing performance detection method based on a temperature-sensitive color change response. Among them, the three-layer composite structure includes a fixed adhesive layer and a deformation detection adhesive layer, and the stress concentration area is determined by observing the fracture of the deformation detection adhesive layer under a preset tension; the special detection tape is composed of a flexible frame and a plurality of detection monomers, and the detection monomer adopts a three-stage design and has dry and wet dual-state detection capabilities; the temperature-sensitive color change response detection adopts a reversible temperature-sensitive material, combined with a precise temperature control system to achieve sealing performance evaluation. This method can not only guide the optimal arrangement of connection points, but also provide a basis for the thickness distribution and local shape design of skin parts.

Description

Technical Field

[0001] The invention relates to the technical field of strength detection of solid materials and their connections, and in particular to a method for testing the strength characteristics of solid materials and their connections under stress. Background Art

[0002] With the improvement and upgrade of UAV models or structural adjustments, the design parameters of skin parts (such as the location, number of connection points, skin thickness, etc.) need to be continuously optimized. Especially for skin parts made of glass fiber reinforced composite materials, the design of their thickness distribution and local shape directly affects the overall performance of the structure. This requires good repeatability of performance testing to support the optimal design solution through multiple tests and adjustments.

[0003] Taking the typical cabin skin 01 as an example, it is made of glass fiber reinforced composite material, in an irregular shell shape, with an irregular hollow area in the middle, see the attached Figure 1~2 . The hollow area has an important function and is used to form an independent enclosed space, where important mission loads or functional components such as optoelectronic pods and reconnaissance equipment can be installed. In order to ensure structural strength and rigidity, metal reinforcements are usually embedded inside the edges of the hollow area. The bottom surface of the edge of the hollow area of ​​the skin part needs to fit tightly with the upper surface of the cabin frame, and the hollow area along the wall 04 and the inner side 05 of the cabin frame remain in the same vertical plane. This connection structure must not only ensure the structural integrity during flight, but also must ensure sealing performance in various harsh environments.

[0004] In engineering practice, the performance test of skin part 01 after installation and connection mainly faces the following technical difficulties:

[0005] 1. Detection challenges caused by the complexity of the connection structure

[0006] Due to the large connection area and complex shape, the reasonable distribution of connection points directly affects the reliability of the overall structure. Traditional stress detection methods are difficult to achieve a comprehensive assessment of such a complex structure, especially in the accurate identification of local stress concentration areas. In addition, the installation of the detection device often interferes with the structure being tested, affecting the accuracy of the measurement results.

[0007] 2. The contradiction between diverse testing needs and method limitations

[0008] As drone models are upgraded or their structures are adjusted, the design parameters of skin parts (such as the location, number, and thickness of connection points) need to be continuously optimized. This requires good repeatability of performance testing to support the optimal design solution through multiple tests and adjustments. However, existing testing methods generally have the problem of insufficient sensitivity or fixed sensitivity, which makes it difficult to meet the differentiated requirements for accuracy and sensitivity at different testing stages.

[0009] 3. Comprehensive test of sealing performance evaluation

[0010] Under the action of preset tension, it is necessary to evaluate whether the deformation and misalignment of each connection point are uniform and within the allowable range. Traditional sealing performance testing methods (such as pressure decay or tracer gas testing) are reliable but inefficient, and it is difficult to quickly locate the leak. At the same time, the testing process often requires complex equipment support, which increases the testing cost and operation difficulty.

[0011] 4. Insufficient systematic data collection and analysis

[0012] In terms of the collection and analysis of test data, existing technologies lack systematic solutions. The real-time and integrity of data collection is difficult to ensure, and the degree of standardization of analysis methods is not high, resulting in poor comparability and traceability of test results. This problem is particularly prominent in scenarios that require multiple optimization iterations. Summary of the invention

[0013] The purpose of the present invention is to solve the shortcomings of the prior art. The present invention provides a detection method system for the connection structure of unmanned aerial vehicle skin parts. Through the organic combination of three technical routes of three-layer composite structure, special detection tape and temperature-sensitive color response, a comprehensive evaluation from stress distribution to sealing performance is achieved. It can not only guide the optimal arrangement of connection points, but also provide a basis for the thickness distribution and local shape design of skin parts. It has the characteristics of accurate detection, convenient operation, reliable results, etc., and provides important technical support for improving the manufacturing level of unmanned aerial vehicles.

[0014] In order to solve the above problems, the present invention adopts the following scheme: a method for detecting the strength characteristics of a solid material and its connection under stress:

[0015] The method adopts a deformation detection structure for detection, wherein the deformation detection structure comprises a three-layer composite structure, wherein the outer layer is a fixed adhesive layer, the middle layer is a deformation detection adhesive layer, and the deformation detection adhesive layer breaks under a preset deformation amount;

[0016] The detection method comprises the following steps:

[0017] Step 1: Performing an initial test, including: arranging a first three-layer composite structure between the wall along the hollow area of ​​the skin component and the inner side surface of the skeleton simulation component;

[0018] Step 2: applying a preset tension to the first three-layer composite structure;

[0019] Step 3: observe and record the fracture condition of the first three-layer composite structure to determine the stress concentration area;

[0020] Step 4: Perform optimization testing, including: adding connection points in the determined stress concentration area; setting up a second three-layer composite structure;

[0021] Step 5: Repeatedly apply the preset tension and record the fracture conditions and increase the connection points until the test structure remains intact.

[0022] Beneficial effects of the technical solution: The three-layer composite structure design realizes the visual detection of stress distribution, and the connection structure can be gradually optimized through a multi-stage progressive evaluation method. The detection results of this method are intuitive and reliable, which can effectively guide the optimization layout of the connection points; at the same time, it has good detection repeatability, can support the continuous optimization of the design solution, and provide a reliable technical basis for the improvement of the connection structure.

[0023] Preferably, the first three-layer composite structure includes, from top to bottom, a first adhesive layer fixedly bonded to the skin part; a first deformation detection adhesive layer; a second adhesive layer fixedly bonded to the skeleton simulation part; wherein the first adhesive layer and the second adhesive layer adopt a high-strength epoxy resin structural adhesive with a breaking elongation of less than 2%. Beneficial effect of the technical solution: By adopting a high-strength epoxy resin structural adhesive with a breaking elongation of less than 2% as the fixed adhesive layer, a firm connection between the detection structure and the tested part is ensured, and the specific breaking elongation limit ensures that the fixed adhesive layer will not affect the accuracy of the test results. The reasonable arrangement of the three-layer structure improves the stability of the entire detection process and makes the test results more credible.

[0024] Preferably, the characteristics of the first deformation detection adhesive layer include: using modified epoxy system materials; maintaining structural integrity within a deformation range of 1.5-2%; being cut into independent strip-shaped detection segments with a width of 3-5mm in a partially cured state; and the detection segments are evenly arranged along the hollow edge. Beneficial effects of the technical solution: The first detection adhesive layer prepared using modified epoxy system materials has controllable fracture characteristics, and its deformation range of 1.5-2% is particularly suitable for preliminary screening of stress concentration areas. The design of cutting the detection adhesive layer into strip-shaped detection segments and evenly arranging them not only improves the accuracy of local stress detection, but also ensures that the detection results are well representative, providing a reliable data basis for stress distribution assessment.

[0025] Preferably, the second three-layer composite structure includes: a second deformation detection adhesive layer; the adhesive layer adopts a modified epoxy system material; and the structure is kept intact within a deformation range of 0.8-1%. Beneficial effects of the technical solution: The modified epoxy system material used in the second detection adhesive layer controls the fracture deformation range to 0.8-1%, significantly improving the detection sensitivity, and is particularly suitable for fine evaluation of the optimized connection structure. By maintaining the consistency of the material system, the comparability with the initial test results is ensured, providing accurate feedback information for the optimization of the connection structure.

[0026] Preferably, the second deformation detection adhesive layer is characterized by: being cut into a strip-shaped independent detection segment 2 with a width of 2-4 mm in a partially cured state; and the detection segment 2 being evenly arranged along the hollow edge. Beneficial effects of the technical solution: By reducing the width of the detection segment to 2-4 mm and evenly arranging it along the hollow edge, the accuracy of local stress distribution assessment is significantly improved. This design not only ensures the systematicness and integrity of the detection, but also facilitates quantitative comparative analysis with the initial detection results, providing more accurate data support for the optimal design of the connection structure.

[0027] As a preferred option, the following optimization measures are also included:

[0028] The detection area is divided into key area, transition area and regular area, and detection segments of different widths are used;

[0029] A progressive loading mode is adopted to gradually increase the tension through a multi-level loading scheme;

[0030] The fracture process was recorded using a high-speed camera and reference marking points were set.

[0031] Beneficial effects of the technical solution: The inspection area is divided into key areas, transition areas and conventional areas, and differentiated inspection section widths are used to achieve a reasonable allocation of inspection resources. A more complete stress distribution evolution process is obtained through the progressive loading mode, and the accuracy and reliability of data analysis are significantly improved with high-speed camera recording and reference mark point setting, providing comprehensive technical support for the optimization of connection structures.

[0032] The present invention also provides the following technical solution: a method for detecting the strength characteristics of a solid material and a solid material after connection under stress:

[0033] The method uses a special detection tape for detection, the special detection tape includes a flexible frame and a plurality of detection units, the detection unit consists of three sections: upper, middle and lower, wherein the middle section has a preset breaking characteristic;

[0034] The detection method comprises the following steps:

[0035] Step 1: In standard detection mode: perform surface treatment on the connection surface;

[0036] Step 2: Paste special detection tape along the circumference of the connection surface to keep the detection units at a uniform spacing of 3-4mm; remove the flexible frame;

[0037] Step 3: Apply a preset tension and observe and record the fracture of the middle section in a dry state;

[0038] Step 4: In high-sensitivity detection mode: use ultrasonic atomization technology to wet the middle section of the detection monomer;

[0039] Step 5: Repeat the application of the preset tension and observe and record the fracture of the middle section in the wet state.

[0040] Beneficial effects of the technical solution: The special detection tape adopts a standardized detection unit design, and the flexible frame ensures the accurate arrangement of the detection unit, which significantly improves the detection efficiency. The dual-mode detection strategy expands the scope of application of the method, and the operation process is simple and easy to promote and apply. The overall solution not only ensures the accuracy of the detection, but also realizes the efficiency and convenience of the detection process.

[0041] Preferably, the detection unit includes: an upper section and a lower section, which are made of high-strength adhesive materials; a middle section, which is made of special paper material, with a breaking deformation of 1.0-1.2% in a dry state and a breaking deformation of 0.5-0.8% in a wet state. Beneficial effects of the technical solution: The three-section structural design adopted by the detection unit ensures the overall stability of the detection structure through reasonable material selection. The middle section material has differentiated fracture characteristics in dry and wet states, provides detection capabilities of different sensitivities, and the detection results are intuitive and reliable, providing richer data support for the evaluation of the connection structure.

[0042] As an advantage, the method further comprises the following steps:

[0043] Step 1: Use laser positioning to ensure the accuracy of tape placement;

[0044] Step 2: Record the fracture process using a high-resolution image acquisition system;

[0045] Step 3: Equip with humidity sensor for real-time parameter monitoring;

[0046] Step 4: Establish a multi-level humidity control plan.

[0047] Beneficial effects of the technical solution: The introduction of the laser positioning auxiliary system improves the accuracy of the detection tape layout, and the high-resolution image acquisition system ensures the integrity of the data record. The implementation of humidity monitoring and multi-level control solutions significantly improves the stability of the detection environment, making the entire detection process more standardized and controllable, and the detection results more reliable.

[0048] The present invention also provides the following technical solution: a sealing performance detection method based on temperature-sensitive color change response, comprising the following steps:

[0049] Step 1: Control the temperature of the temperature control system at 25±2℃ and the humidity at 45±5%RH;

[0050] Step 2: ultrasonic cleaning and plasma activation treatment are performed on the detection surface;

[0051] Step 3: Install an improved detection tape structure, wherein the detection layer of the detection tape structure adopts a temperature-sensitive color-changing material, which is light blue at 25°C and turns into dark blue at 40±2°C;

[0052] Step 4: Apply hot air at a temperature of 40±2°C and a wind speed of 0.5-5m / s through the temperature control system;

[0053] Step 5: Use a 4K high-speed camera (≥60fps) to record the detection process.

[0054] Beneficial effects of the technical solution: This solution achieves intuitive evaluation of sealing performance by precisely controlling environmental parameters and using temperature-sensitive color-changing materials. The surface treatment process of ultrasonic cleaning and plasma activation ensures the accuracy of detection. The high-speed camera device is used to record the detection process, making the result interpretation simple and intuitive. The entire detection process is fast and efficient, and has good practicality.

[0055] Preferably, the thermochromic material has reversible properties and automatically returns to its initial state after the temperature is restored; the detection adopts a regional scanning mode and pulse thermal excitation technology; the temperature control accuracy of the temperature control system is ±0.5°C; the uniformity of the professional light source system is ≥95%. Beneficial effects of the technical solution: The reversible properties of the thermochromic material not only support repeated detection, but also significantly reduce the detection cost. Through the application of partition scanning and pulse thermal excitation technology, combined with a high-precision temperature control system and a uniform light source, the detection efficiency and accuracy are significantly improved. The entire detection system is highly integrated and easy to operate, providing a reliable technical guarantee for sealing performance evaluation.

[0056] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0057] From the technical route, the present invention has established a complete detection system from stress distribution to sealing performance. Through the two technical routes of three-layer composite structure and special detection tape, as well as the introduction of temperature-sensitive color change response detection method, a complementary and step-by-step evaluation scheme has been formed. This multi-dimensional detection strategy not only provides comprehensive performance evaluation data, but also achieves complete coverage from structural strength to sealing performance. In particular, by analyzing the stress distribution characteristics of each area, it can provide a direct design basis for the local thickness optimization and shape improvement of the skin parts, help determine whether the key areas need to increase the material thickness or adjust the local shape, and significantly improve the systematicness and guiding value of the detection.

[0058] In terms of detection accuracy, the present invention adopts a multi-stage progressive evaluation method and a differentiated detection strategy. By designing detection materials with different fracture characteristics, combined with fine partition detection and progressive loading mode, a step-by-step progression from macroscopic screening to local precise evaluation is achieved. Especially in key areas, by adjusting the width and spacing of the detection sections, more accurate stress distribution data can be obtained, providing an accurate technical basis for the optimization of the connection structure.

[0059] From the perspective of operational practicality, the present invention designs a standardized detection structure and a standardized operation process. The application of special detection tape significantly simplifies the detection preparation work and improves the detection efficiency. The temperature-sensitive color change response detection method provides an intuitive result interpretation method. These improvements make the detection method highly practical and popularizable, and can meet various detection needs in engineering practice.

[0060] In terms of detection reliability, the present invention has established a complete environmental control and data acquisition system. By precisely controlling environmental parameters such as temperature and humidity, equipped with advanced equipment such as high-speed cameras, and using standardized data recording methods, the stability of the detection process and the reliability of the results are ensured. The reversible performance and good repeatability of the detection structure provide a reliable guarantee for the continuous optimization of the connection structure.

[0061] From the perspective of cost-effectiveness, the detection method of the present invention has significant economic advantages. The detection structure is made of common materials, the operation process is simple and standardized, the detection equipment is highly versatile, and the maintenance cost is low. In particular, the reversible performance of the temperature-sensitive color-changing material significantly reduces the material cost of repeated detection. These characteristics make this method have a good prospect for promotion and application.

[0062] In general, the present invention has achieved a comprehensive improvement in detection performance through systematic technological innovation, and has provided reliable technical support for the optimal design of solid materials and their connection structures. While ensuring detection accuracy and reliability, this method has significant advantages such as convenient operation and reasonable cost, and has important practical significance for improving the manufacturing and maintenance level of drones. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the figures required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the figures described below are only some embodiments of the present application. For ordinary technicians in this field, other figures can be obtained based on these figures without paying creative work.

[0064] Figure 1 It is a structural diagram of the skin component from an oblique top-down angle;

[0065] Figure 2 It is a structural diagram of the skin component from an oblique side view angle;

[0066] Figure 3 is a schematic diagram of measuring by a method according to an embodiment of the present invention;

[0067] Figure 4 yes Figure 3 The partial enlarged view at A in the middle shows the working position of the detection unit of Example 2;

[0068] Figure 5 is a cross-sectional schematic diagram of the first three-layer composite structure in Example 1;

[0069] Figure 6 It is a structural schematic diagram of a skeleton simulation component;

[0070] Figure 7 is a flowchart of the detection operation process of Example 1;

[0071] Figure 8 is a flowchart of the detection operation process of Example 2;

[0072] Fig. 9 is a flowchart of the detection operation process of Example 3;

[0073] Fig.10 is a schematic structural diagram of the detection tape structure in Example 2;

[0074] Fig.11 is a schematic diagram of the state after the detection tape structure is installed and the flexible frame is torn off in Example 2;

[0075] Fig.12 It is a cross-sectional schematic diagram of the second three-layer composite structure in Example 1.

[0076] Reference numerals:

[0077] Support frame 20 / skeleton simulation part 10 / skin part 01 / screw hole 03 / hollow area along wall 04 / inner side 05 / pulley block 30 / fixing frame 31 / rope assembly 40 / counterweight module 50 / deformation detection structure 60 / first three-layer composite structure 61 / first adhesive layer 611 / second adhesive layer 612 / first deformation detection adhesive layer 613 / strip-shaped independent detection section one 06 / second three-layer composite structure 62 / second deformation detection adhesive layer 623 / strip-shaped independent detection section two 07 / detection tape structure 63 / flexible frame 631 / detection unit 632 / upper section 632a / middle section 632b / lower section 632c. DETAILED DESCRIPTION

[0078] The following will be combined Figure 1-Figure 12 The preferred embodiments of the present invention are described in detail. It should be noted that the following description is only a preferred embodiment of the present invention, rather than a limitation of the present invention. Those skilled in the art should understand that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0079] Embodiment 1: Stress distribution detection method (based on deformation detection structure)

[0080] This embodiment provides a detection method for testing the strength characteristics of drone skin parts and their connection points under stress. Through the fracture characteristics of the special three-layer composite structure under a preset deformation, an accurate evaluation of the stress distribution of the connection structure is achieved. The detection device is mainly composed of a support frame 20, a skeleton simulation part 10, a pulley block 30, a rope assembly 40, a counterweight module 50 and a deformation detection structure 60. The skeleton simulation part 10 simulates the cabin skeleton structure, and an adjustable screw hole 03 is provided on the upper surface; the pulley block 30 is multi-directionally adjustable through a fixing frame 31, and cooperates with the rope assembly 40 to apply and transmit stable tension; the counterweight module 50 provides a preset constant load. See Figure 3 .

[0081] The testing process adopts a multi-stage progressive evaluation method. First, the initial test is carried out using the first three-layer composite structure 61, see Figure 5The structure includes a first adhesive layer 611 fixed to the hollow area of ​​the skin part 01 along the wall 04, a second adhesive layer 612 fixed to the inner side 05 of the skeleton simulation part 10, and a first deformation detection adhesive layer 613 in the middle connecting the first adhesive layer 611 and the second adhesive layer 612. The first and second adhesive layers use high-strength epoxy resin structural adhesive (elongation at break <2%), and the first deformation detection adhesive layer 613 uses a specially formulated modified epoxy system, which remains intact within the deformation range of 1.5-2% and breaks beyond it. During the test, the first deformation detection adhesive layer 613 is cut into independent detection sections 06 with a width of 3-5mm and a spacing of 2-3mm, and the stress concentration area is determined by observing its fracture under the preset tension.

[0082] After entering the optimization test phase, the second three-layer composite structure 62 is adopted, see Fig.12 This structure is similar to the first one, but the formula of the second deformation detection adhesive layer 623 has been adjusted to make it more sensitive and break within the deformation range of 0.8-1%. It is cut into independent detection segments 207 with a width of 2-4mm and a spacing of 2-3mm to evaluate the stress distribution after adding connection points. For areas that require special attention, the local detection accuracy can be further improved by adjusting the detection segment width (2-3mm).

[0083] It should be pointed out that the materials used in the above-mentioned adhesive layers are not the only choice. Technical personnel in this field can select other material systems with similar mechanical properties according to actual application requirements, such as other types of modified epoxy resins, modified acrylic adhesives, etc., as long as they can meet the corresponding deformation detection requirements.

[0084] In order to improve the accuracy and reliability of the detection method, this embodiment also introduces the following optimization measures:

[0085] 1. Partition detection strategy: Divide the detection area into key areas, transition areas and regular areas, and use detection segments of different widths to achieve differentiated monitoring.

[0086] 2. Progressive loading mode: Design a multi-level load loading scheme to obtain a more complete stress distribution evolution process by gradually increasing the tension.

[0087] 3. Improvement of data collection: Equip with high-speed camera equipment to capture the transient process of fracture; set reference markers to assist stress distribution analysis; use grid recording method to improve data accuracy.

[0088] 4. Result evaluation system: establish fracture mode classification standards, formulate stress level evaluation scales, and design connection point optimization decision-making processes.

[0089] The complete testing process includes: preliminary preparation (surface treatment, environmental adjustment) → initial testing (stress concentration area identification) → local optimization (connection point adjustment) → fine testing (stress uniformity verification) → system evaluation (overall performance confirmation). The testing and optimization process is repeated until all test sections remain intact under the preset tension, indicating that the connection structure meets the design requirements.

[0090] The innovation of this method lies in: adopting a two-stage detection strategy to achieve a comprehensive evaluation from macro to micro. Introducing the concept of partitioned detection to improve the detection accuracy of key areas. Establishing a complete environmental control and data collection system. Forming a systematic result evaluation and optimization decision-making method.

[0091] Through the above improvements, this detection method significantly improves the evaluation accuracy and result reliability while maintaining operational convenience, providing strong support for the optimal design of the connection structure of UAV skin parts.

[0092] Example 2: Stress distribution detection method based on intelligent response tape

[0093] On the basis of Example 1, in order to further improve the detection efficiency and reduce the complexity of operation, this embodiment provides a stress distribution detection method using a special detection tape structure. This method inherits the advantages of partition detection and progressive loading in Example 1, and realizes accurate evaluation of the stress distribution of the connection point through the fracture characteristics of the intelligent response material. Compared with Example 1, this method simplifies the preparation process of the detection structure and improves the detection efficiency.

[0094] This embodiment provides a method for stress distribution detection using a special detection tape structure 63, and realizes accurate evaluation of stress distribution of connection points by responding to the fracture characteristics of the material. The method is based on the special detection tape, and the uniform distribution of detection units 632 is maintained through a flexible frame 631. Each detection unit is composed of an upper section 632a, a middle section 632b and a lower section 632c, forming a complete stress response system.

[0095] The core innovation of the detection tape lies in its three-section structural design: the upper and lower sections (632a, 632c) use high-strength adhesive materials to ensure stable connection, and the middle section 632b uses special paper materials with preset breaking characteristics. The detection units maintain a standard spacing of 3-4mm through the flexible frame 631 to ensure detection accuracy and repeatability.

[0096] The detection process adopts a dual-mode response strategy:

[0097] 1. Standard test mode (dry state): Pretreatment: precisely control the surface roughness to ensure bonding reliability; Positioning and installation: use laser positioning assistance to ensure the accuracy of tape layout; Response characteristics: the deformation of the middle section fracture is controlled within the range of 1.0-1.2%; Data acquisition: use a high-resolution image acquisition system to record the fracture process;

[0098] 2. High sensitivity mode (wetting state): Environmental control: Use ultrasonic atomization technology to achieve uniform wetting; Humidity gradient: Establish a multi-level humidity control scheme; Sensitivity improvement: The fracture strain range is reduced to 0.5-0.8%; Real-time monitoring: Equipped with a humidity sensor for parameter feedback.

[0099] Through the above dual-mode detection strategy and systematic design, this method achieves accurate evaluation of stress distribution detection. It has the characteristics of convenient operation, adjustable detection sensitivity, intuitive and reliable results, etc. This method provides effective technical support for the optimization of the connection structure of UAV skin parts and can meet the testing needs at different stages.

[0100] Example 3: Sealing performance detection method based on temperature-sensitive color change response

[0101] Based on the detection system established in Example 1 and Example 2, this embodiment provides a sealing performance detection method to comprehensively evaluate the performance characteristics of the skin component connection structure. This method inherits the detection concept of the previous embodiment, improves the detection tape structure of Example 2, introduces the color change response mechanism of temperature-sensitive materials, and realizes the expansion from stress distribution detection to sealing performance evaluation. The extension of this technical route not only maintains the convenience of detection, but also expands the evaluation dimension.

[0102] This embodiment provides a sealing performance detection method, which is improved based on the detection tape structure of Example 2, and realizes accurate evaluation of the sealing performance of the connection structure through the color change response of the temperature sensitive material. The detection structure adopts a temperature sensitive color changing material, which is light blue at room temperature (25°C) and turns into dark blue at 40±2°C, and has excellent reversible performance (repeated use>100 times).

[0103] The detection system integrates a temperature control system and an image acquisition system. The temperature control system includes a hot air generator (temperature control accuracy ±0.5°C, wind speed 0.5-5m / s adjustable) and an infrared temperature real-time monitoring module; the image acquisition system is equipped with a 4K high-speed camera (≥60fps) and an adjustable color temperature professional light source system (uniformity ≥95%) to ensure accurate control and data acquisition during the detection process.

[0104] Detection method flow: First, environmental parameters are controlled (temperature 25±5℃, humidity 45±5%RH) and surface treatment (ultrasonic cleaning, plasma activation); then, load is applied through a multi-stage loading scheme, and detection is performed using a regional scanning mode and pulse thermal excitation technology; finally, an algorithm is used for data processing to achieve accurate identification and analysis of leakage characteristics.

[0105] The innovative value of this method is reflected in: 1) the upgrade from qualitative to quantitative testing; 2) the establishment of a complete testing system; 3) the development of professional evaluation standards. In terms of application, it has the advantages of high testing efficiency, reliable results, and convenient operation. It also has the characteristics of wide application range, high degree of standardization, and low promotion and maintenance costs. Through systematic improvement, this method provides reliable technical support for the sealing performance evaluation of the UAV skin connection structure, and the test results can provide accurate data support for the optimization design of the connection structure.

[0106] It should be noted that the specific parameters involved in the present invention are all preferred implementation methods, not the only limiting values. For example, the width of the detection section can be adjusted within the range of 2-5mm according to the actual detection requirements, and the spacing of the detection monomers can also be selected within the range of 2-4mm. The specific values ​​can be appropriately adjusted in combination with the characteristics of the structure to be tested and the required detection accuracy. Similarly, the materials used in each adhesive layer are not limited to the specific materials described in the embodiments. Those skilled in the art can choose other material systems with similar mechanical properties or temperature-sensitive properties, such as other types of modified epoxy resins, modified acrylic adhesives, and temperature-sensitive materials of different formulations. The core of the detection method is to utilize the specific response characteristics of the material to achieve the evaluation of stress distribution and sealing performance. Therefore, as long as the selected material can meet the corresponding deformation detection or temperature-sensitive response requirements. This flexibility enables the present invention to better adapt to different application scenarios and detection needs.

Claims

1. A method for detecting the strength characteristics of a solid material and its connection under stress, characterized in that: The method adopts a deformation detection structure for detection, wherein the deformation detection structure comprises a three-layer composite structure, wherein the outer layer is a fixed adhesive layer, the middle layer is a deformation detection adhesive layer, and the deformation detection adhesive layer breaks under a preset deformation amount; The detection method comprises the following steps: Step 1: Performing an initial test, including: arranging a first three-layer composite structure (61) between the hollow area wall (04) of the skin component (01) and the inner side surface (05) of the skeleton simulation component (10); Step 2: applying a preset tension to the first three-layer composite structure (61); Step 3, observing and recording the fracture condition of the first three-layer composite structure (61) to determine the stress concentration area; Step 4: performing optimization testing, including: adding connection points in the determined stress concentration area; setting a second three-layer composite structure (62); Step 5: Repeatedly apply the preset tension and record the fracture conditions and increase the connection points until the test structure remains intact; The first three-layer composite structure (61) comprises, from top to bottom, a first adhesive layer (611) fixedly bonded to the skin component (01); a first deformation detection adhesive layer (613); and a second adhesive layer (612) fixedly bonded to the skeleton simulation component (10); wherein the first adhesive layer (611) and the second adhesive layer (612) are made of high-strength epoxy resin structural adhesive with a breaking elongation of less than 2%; The first deformation detection adhesive layer (613) has the following features: using modified epoxy system materials; maintaining structural integrity within a deformation range of 1.5-2%; being cut into strip-shaped independent detection segments (06) with a width of 3-5 mm in a partially cured state; and the detection segments (06) are evenly arranged along the hollow edge; The second three-layer composite structure (62) comprises: a second deformation detection adhesive layer (623); the adhesive layer is made of a modified epoxy system material; and the structure is kept intact within a deformation range of 0.8-1%.

2. The method for detecting the strength characteristics of a solid material and a solid material after connection under stress according to claim 1, characterized in that: The characteristics of the second deformation detection adhesive layer (623) include: being cut into strip-shaped independent detection segments (07) with a width of 2-4 mm in a partially cured state; and the detection segments (07) are evenly arranged along the hollow edge.

3. The method for detecting the strength characteristics of a solid material and a solid material after connection under stress according to claim 1, characterized in that: The following optimization measures are also included: The detection area is divided into key area, transition area and regular area, and detection segments of different widths are used; A progressive loading mode is adopted to gradually increase the tension through a multi-level loading scheme; The fracture process was recorded using a high-speed camera and reference marking points were set.

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