A design method of impact-resistant and thermal-insulation bifunctional structure

Abstract

The application discloses a design method of an anti-impact and heat-insulation bifunctional structure and belongs to the technical field of multifunctional design of bionic structures. The method comprises the following steps: (1) constructing a three-dimensional model of an anti-impact multistage structure by using three-dimensional modeling software; (2) introducing a spiral configuration into the anti-impact multistage three-dimensional model; (3) printing a structure frame by using a 3D printing technology; and (4) filling aerogel in the frame by using a sol-gel preparation method, and obtaining the bifunctional structure after impregnation, solidification and drying. The design method of the anti-impact and heat-insulation bifunctional structure provided by the application prepares an anti-impact and heat-insulation bifunctional structure with bionic characteristics, which not only integrates the inspiration of bionics, but also comprehensively considers the mechanical properties and heat-insulation properties of the structure, so that the prepared structure reaches a balance between the anti-impact and heat-insulation properties.

Description

Technical Field

[0001] This invention relates to the field of multifunctional design technology of biomimetic structures, specifically to a design method for a dual-functional structure with impact resistance and thermal insulation. Background Technology

[0002] With the continuous advancement of science and technology and the development of society, the performance requirements for material structures under specific environments are becoming increasingly stringent. Bionics, as an interdisciplinary research field, has provided many insights through in-depth research into the structure and function of organisms. For example, the concentric circle structure in skeletons and the spiral structure of sea snails exhibit excellent impact resistance, stemming from their unique structural design. By drawing inspiration from the design principles of these organisms, we can provide insights for the design of novel impact-resistant structures.

[0003] However, in certain specialized applications, such as aerospace, automotive, and military fields, structural materials must not only withstand external impacts but also possess excellent thermal insulation properties. Traditional structural designs often require a trade-off between these two aspects, resulting in complex structures, high costs, and difficulty in meeting comprehensive performance requirements.

[0004] There is a wealth of research on biomimetic structures, but most studies only achieve a single structural performance, with few reports on the design and research of multifunctional biomimetic structures. To address this issue, this invention provides a design method for a dual-functional structure that combines impact resistance and thermal insulation. Summary of the Invention

[0005] The purpose of this invention is to provide a design method for a dual-function structure that is both impact-resistant and heat-insulating, aiming to design a structure with both impact-resistant and heat-insulating functions to meet the current needs of the aerospace and military fields for multifunctional structures.

[0006] To achieve the above objectives, the present invention provides a design method for an impact-resistant and thermal insulation dual-functional structure, comprising the following steps:

[0007] (1) Use 3D modeling software to construct a 3D model of a biomimetic, impact-resistant, multi-level structure;

[0008] (2) Introduce a spiral configuration into the multi-level three-dimensional model for impact resistance;

[0009] (3) The structural frame was printed using 3D printing technology;

[0010] (4) A bifunctional structure was obtained by filling the framework with aerogel using the sol-gel preparation method, impregnating, curing and drying.

[0011] Preferably, the multi-level structure in step (1) includes an external support structure and an internal compact structure.

[0012] Preferably, the external support structure is formed by longitudinally stretching three overlapping hexagonal structures, and the internal compact structure is composed of seven structures that are proportionally reduced to the external support structure.

[0013] Preferably, the connection between the second and third layers of the external support structure is a hollow cylindrical structure; the vertices of the regular hexagons of the second layer of the external support structure are located at the center of the edge of the first layer and are embedded, and the vertices of the cross-sections of the internal compact structure are located at the center of the third layer of the external support structure and are embedded; the vertices of the cross-sections of the seven structural units of the internal compact structure are connected and embedded in each other.

[0014] Preferably, the specific operation of step (2) is as follows: based on the spiral configuration of the conch, the cross section of the design structure is stretched to form a three-dimensional structure, and then twisted counterclockwise by 12° to form a spiral structure model, which is introduced into the impact-resistant multi-level three-dimensional model and saved as an STL file.

[0015] Preferably, the specific operation of step (3) is as follows: import the STL file and print the physical model using 3D printing technology.

[0016] Preferably, the specific operation of step (4) is as follows: mix B80 type phenolic resin and anhydrous ethanol into a uniform solution and transfer it to a glass container. Then, immerse the model in the container and place it in an ultrasonic generator for ultrasonic treatment. After taking out the container, place it in an oven to react and cure the resin. After curing, take out the container and cool it to room temperature. Take out the sample and dry it at room temperature and pressure to obtain a bifunctional structure filled with aerogel.

[0017] Preferably, the B80 type phenolic resin and anhydrous ethanol are mixed to form a phenolic resin solution with a mass fraction of 30%.

[0018] Preferably, the reaction is carried out in an oven at 150°C for 24 hours.

[0019] Therefore, this invention provides a design method for an impact-resistant and heat-insulating dual-function structure, resulting in an impact-resistant and heat-insulating dual-function structure with biomimetic characteristics. This technology not only integrates the inspiration of bionics, but also comprehensively considers the mechanical properties and heat insulation properties of the structure, so that the resulting structure achieves a balance between impact resistance and heat insulation performance.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the impact-resistant and thermal insulation dual-functional structure design of the present invention.

[0022] Figure 2This is a geometric model of an impact-resistant multi-level structure obtained in an embodiment of the present invention;

[0023] Figure 3 This is a physical model 3D printed according to an embodiment of the present invention;

[0024] Figure 4 This is an example of an impact-resistant and heat-insulating dual-functional structure obtained in an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the deformation process of the impact-resistant and heat-insulating dual-function structure obtained in an embodiment of the present invention under the impact of a Hopkinson bar.

[0026] Figure 6 The temperature rise of the impact-resistant and heat-insulating dual-function structure prepared according to an embodiment of the present invention on a hot plate at 300°C. Detailed Implementation

[0027] This invention provides a design method for an impact-resistant and thermal insulation dual-functional structure, comprising the following steps:

[0028] (1) Use 3D modeling software to construct a 3D model of a biomimetic, impact-resistant, multi-level structure;

[0029] The multi-level structure includes an external support structure and an internal compact structure. The external support structure is formed by longitudinally stretching three layers of similar hexagonal layers with a certain wall thickness, while the internal compact structure is composed of seven structures that are proportionally reduced to the external support structure.

[0030] The connection between the second and third layers of the external support structure is a hollow cylindrical structure, which improves the structure's energy absorption characteristics. In the second layer of the external support structure, the vertices of regular hexagons of a certain thickness are located at the center of the edge of the first layer and are embedded to a certain depth. The vertices of the cross-sections of the internal compact structure are located at the center of the third layer of the external support structure and are embedded to a certain depth. The vertices of the cross-sections of the seven structural units in the internal compact structure, which are proportionally scaled down from the external support structure, are connected and embedded to each other to a certain depth.

[0031] (2) Introduce a spiral configuration into the multi-level three-dimensional model for impact resistance;

[0032] Based on the spiral configuration of a conch shell, the cross-section of the designed structure is stretched to form a three-dimensional structure, and then twisted counterclockwise by 12° to form a spiral structure model. This model is then incorporated into a multi-level impact-resistant three-dimensional model and saved as an STL file.

[0033] (3) The structural frame was printed using 3D printing technology;

[0034] Preferably, the specific operation of step (3) is as follows: import the STL file and print the physical model using 3D printing technology.

[0035] (4) A bifunctional structure was obtained by filling the framework with aerogel using the sol-gel preparation method, impregnating, curing and drying.

[0036] A 30% (w / w) phenolic resin solution was prepared by mixing B80 type phenolic resin and anhydrous ethanol solution. The solution was mechanically stirred at room temperature for 30 minutes until the phenolic resin was completely dissolved, resulting in a homogeneous solution. The prepared solution was transferred to a sealed glass container, and the model was placed inside. The container was then placed in an ultrasonic generator to ensure the solution completely immersed in the structure. The container was removed and placed in a 150℃ oven for 24 hours to allow the resin to fully cure. After curing, the container was removed and cooled to room temperature. The sample was then taken out, dried at room temperature and pressure, and polished to obtain a bifunctional hierarchical structure filled with aerogel.

[0037] The following detailed description of embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0038] Example

[0039] like Figure 1 As shown, this embodiment provides a design method for an impact-resistant and thermal insulation dual-functional structure, including the following steps:

[0040] (1) Inspired by the unique microstructure of bones, an impact-resistant multi-level structure was constructed, including an outer structural support and an inner compact structure. Figure 2 A multi-level impact-resistant structural geometric model was created for 3D software. The external support structure is formed by longitudinally stretching three layers of similar hexagonal layers with a certain wall thickness, while the internal compact structure is composed of seven structures scaled down proportionally to the external support structure.

[0041] The connection between the second and third layers of the external support structure is a hollow cylindrical structure, which improves the structure's energy absorption characteristics. In the second layer of the external support structure, the vertices of regular hexagons of a certain thickness are located at the center of the edge of the first layer and are embedded to a certain depth. The vertices of the cross-sections of the internal compact structure are located at the center of the third layer of the external support structure and are embedded to a certain depth. The vertices of the cross-sections of the seven structural units in the internal compact structure, which are proportionally scaled down from the external support structure, are connected and embedded to each other to a certain depth.

[0042] (2) Based on the unique structure of the conch shell, the cross-section of the designed structure is stretched to form a three-dimensional structure, and then twisted counterclockwise by 12° to form a spiral structure. The designed structure is saved as an STL format file and printed using 3D printing technology to obtain the desired result. Figure 3 The physical model shown was printed using 316L stainless steel.

[0043] (3) Phenolic aerogel was filled into the structure to achieve its thermal insulation performance. The aerogel filling method was achieved through a sol-gel method and a normal pressure drying process. First, a phenolic resin solution with a mass fraction of 30% was prepared by mixing B80 type phenolic resin and anhydrous ethanol solution. The solution was mechanically stirred at room temperature for 30 minutes until the phenolic resin was completely dissolved to obtain a homogeneous solution. The prepared solution was transferred to a glass container and sealed, and the designed structure was placed in the container. The container was placed in an ultrasonic generator to completely immerse the solution in the structure. The container was then removed and placed in a 150℃ oven for 24 hours to allow the resin to fully cure. After curing, the container was removed and cooled to room temperature. The sample was then taken out and dried at room temperature and pressure to obtain the desired result. Figure 4 The multi-level structure of the aerogel filling is shown.

[0044] The impact resistance and thermal insulation performance of the multi-level structure prepared in this embodiment were evaluated. Figure 5 The deformation of the structure under Hopkinson bar impact is shown. The results show that the structure does not deform significantly under high-speed impact. Figure 6 The temperature rise of the back side of the structure on a 300℃ hot plate was measured. The results showed that after 180 seconds, the temperature of the back side of the structure remained at 20℃, with no significant increase. These experimental results demonstrate that the multi-stage structure has excellent impact resistance and thermal insulation performance.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A design method for an impact-resistant and thermal insulation dual-functional structure, characterized in that, Includes the following steps: (1) Use 3D modeling software to construct a 3D model of a biomimetic impact-resistant multi-level structure; (2) Introduce a spiral configuration into the multi-level three-dimensional model for impact resistance; (3) The structural frame was printed using 3D printing technology; (4) A bifunctional structure was obtained by filling the framework with aerogel using the sol-gel preparation method, followed by impregnation, curing, and drying. The multi-level structure in step (1) includes an external support structure and an internal compact structure; the external support structure is formed by longitudinal stretching of three overlapping equilateral hexagonal structures, and the internal compact structure is composed of seven structures that are proportionally reduced to the external support structure. The connection between the second and third layers of the external support structure is a hollow cylindrical structure; the vertices of the regular hexagons in the second layer of the external support structure are located at the center of the first layer's edge and are embedded therein, and the vertices of the cross-sections of the internal compact structure are located at the center of the third layer of the external support structure and are embedded therein; the vertices of the cross-sections of the seven structural units of the internal compact structure are connected and embedded in each other. The specific operation of step (2) is as follows: Based on the spiral configuration of the conch, the cross section of the design structure is stretched to form a three-dimensional structure, and then twisted counterclockwise by 12° to form a spiral structure model, which is then introduced into the impact-resistant multi-level three-dimensional model and saved as an STL file.

2. The design method of the impact-resistant and heat-insulating dual-functional structure according to claim 1, characterized in that, The specific operation of step (3) is as follows: import the STL file and use 3D printing technology to print the physical model.

3. The design method of the impact-resistant and thermal insulation dual-functional structure according to claim 1, characterized in that, The specific operation of step (4) is as follows: mix B80 type phenolic resin and anhydrous ethanol into a uniform solution and transfer it to a glass container. Then, immerse the model in the container and then place it in an ultrasonic generator for ultrasonic treatment. After taking out the container, place it in an oven to react and cure the resin. After curing, take out the container and cool it to room temperature. Take out the sample and dry it at room temperature and pressure to obtain a bifunctional structure filled with aerogel.

4. The design method of the impact-resistant and heat-insulating dual-functional structure according to claim 3, characterized in that: The B80 type phenolic resin and anhydrous ethanol are mixed to form a phenolic resin solution with a mass fraction of 30%.

5. The design method of an impact-resistant and thermal insulation dual-functional structure according to claim 3, characterized in that: React in an oven at 150°C for 24 hours.

Images