Impact-resistant protective structure formed based on additive manufacturing and preparation method of impact-resistant protective structure
The impact-resistant protective structure, formed by additive manufacturing, combines Gyroid and Kagome unit structures with fluid-filled inner core channels to achieve multi-stage energy absorption. This solves the problem of insufficient performance of traditional materials in high-strength and high-speed impacts, and improves energy absorption effect and material performance.
Patent Information
- Application Number
- CN202511641143.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-11
- Publication Date
- 2026-02-10
AI Technical Summary
Traditional energy-absorbing materials are insufficient to meet the demands of aerospace, rail transportation and other fields for lightweight, high strength and high energy absorption rate, especially in terms of high strength and high-speed impact performance.
An impact-resistant protective structure is formed by additive manufacturing, combining Gyroid and Kagome unit structures. The inner core structure is filled with fluid, and a multi-stage energy absorption process is achieved through topological interpenetration design, combining fluid-structure interaction and thermal management characteristics.
It significantly improves the energy absorption effect of materials during high-speed collisions, possesses high specific strength, lightweight and buckling resistance, and provides efficient vibration control and thermal management capabilities.
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Figure CN121491344A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of impact-resistant structures, in particular to an impact-resistant protective structure based on additive manufacturing. BACKGROUND
[0002] With the urgent demand of lightweight, high-strength, high-energy absorption rate of structural materials in the fields of aerospace, rail transportation and protective engineering. Traditional buffer energy-absorbing materials (foamed metal, artificial lattice structure) have been difficult to meet the requirements of modern engineering applications. Traditional foamed metal has the problem of stress concentration caused by random pore distribution, while artificial lattice structures such as Gyroid, Kagome, etc. have regular topological configurations, but their buffer energy-absorbing performance still needs to be improved, especially the performance of resisting high-strength and high-speed impact needs to be improved. SUMMARY
[0003] The technical problem to be solved by the present application is to provide an impact-resistant protective structure based on additive manufacturing with excellent buffer energy-absorbing performance.
[0004] In order to solve the above technical problems, the present application provides an impact-resistant protective structure based on additive manufacturing, comprising an inner core structure composed of a plurality of Gyroid unit structures and a closed layer wrapped around the four sides of the inner core structure; the Gyroid unit structure has 2 non-communicating flow channels; the corresponding flow channels of the two Gyroid unit structures adjacent to the inner core structure are communicated; at least one flow channel of the inner core structure is filled with a fluid; the corresponding filling ports are reserved on the corresponding positions of the two flow channels of the closed layer.
[0005] Further, the fluids filled in the two flow channels of the inner core structure can be the same or different.
[0006] Further, the pressure of the fluids filled in the two flow channels of the inner core structure can be the same or different.
[0007] Further, the fluid is air, fire-retardant gas or water.
[0008] Another further scheme, the fluid is a non-Newtonian fluid.
[0009] Further, the inner core structure further comprises a plurality of Kagome unit structures; the Kagome unit structures are penetrated in the interior of the Gyroid structure.
[0010] The present application also provides a preparation method of an impact-resistant protective structure based on additive manufacturing, comprising the following steps: S1, constructing a three-dimensional model of the product, the three-dimensional model comprising the inner core structure and the closed layer of claim 1 or 6; S2, printing the three-dimensional model in step S1 based on an additive manufacturing technology; S3, filling a fluid into flow channels of the inner core structure, the fluids filled into the two flow channels can be the same or different; S4, after the fluid is filled, the flow channels are sealed and a certain pressure is maintained in the flow channels.
[0011] Further, the step S2 further comprises polishing the inside and outside of the printed workpiece.
[0012] The present application has the following beneficial effects: The present application has the following beneficial effects:
[0013] The present application also exhibits good multi-physical field coupling characteristics, and the fluid-structure coupling effect significantly enhances the structural damping, which is helpful for efficient vibration control; the high specific surface area of the present application and the convection heat transfer of the fluid synergistically act to give the whole high efficient thermal management capability; the present application has high specific strength and excellent anti-buckling performance, realizing lightweight and high strength. In addition, the present application can be realized based on the existing additive manufacturing technology, and the topological optimization method is combined to ensure the performance predictability and manufacturing reliability, providing a new generation of high-performance buffer and energy absorption solution for the fields of aerospace, rail transportation and protection engineering. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 is the design drawing of the Gyroid unit structure in Example 1 (left) and the partial three-dimensional structure design drawing of the inner core structure (right); Figure 2 is the partial physical drawing of the inner core structure printed in Example 1; Figure 3 is the design drawing of the Kagome unit structure in Example 2; Figure 4 is the partial three-dimensional structure design drawing of the inner core structure in Example 2; Figure 5 is the partial physical drawing of the inner core structure printed in Example 2. DETAILED DESCRIPTION
[0015] The specific embodiments of the present application will be further described with reference to the drawings. It is to be noted that the description of these embodiments is intended for the purpose of illustration only and is not intended to limit the present application. Furthermore, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no conflict.
[0016] Embodiment 1 An impact protection structure based on additive manufacturing forming, comprising an inner core structure composed of several Gyroid unit structures and a closed layer wrapped around the inner core structure; the Gyroid unit structure has 2 flow channels that are not connected to each other, as shown in Figure 1 ; the corresponding flow channels of two adjacent Gyroid unit structures of the inner core structure are connected; at least one flow channel of the inner core structure is filled with a fluid; and the corresponding filling ports are reserved for the two flow channels at the corresponding positions on the closed layer. As shown in Figure 1 , the left is a design drawing of the Gyroid unit structure, Figure 1 , and the right is a partial three-dimensional structure design drawing of the inner core structure. Figure 2 , which is a partial physical drawing of the printed inner core structure.
[0017] The Gyroid unit structure is a prior art, and its implicit function expression is: sin(X)cos(Y) + sin(Y)cos(Z) + sin(Z)cos(X) = C (where C is a constant). This formula defines the shape of the Gyroid surface through the linear combination of trigonometric functions, and the value of the constant C will affect the position of the surface of equal value.
[0018] Further, the fluids filled in the two flow channels of the inner core structure can be the same or different.
[0019] Further, the pressures of the fluids filled in the two flow channels of the inner core structure can be the same or different.
[0020] Further, the fluid is a Newtonian fluid, in this embodiment, it is filled with air, and in another embodiment, it can also be filled with a fire-retardant gas or water or other Newtonian fluids.
[0021] In another embodiment, the flow channel can also be filled with a non-Newtonian fluid. Compared with Newtonian fluid, the non-Newtonian fluid has better instantaneous impact resistance, which can make the product have better buffering and energy absorption.
[0022] Embodiment 2 Compared with Embodiment 1, the inner core structure further comprises several Kagome unit structures; the Kagome unit structure penetrates into the interior of the Gyroid structure to form a K-G interpenetrating multi-dimensional buffer structure. The three-dimensional design drawing of the Kagome unit structure is as shown in Figure 3The partial three-dimensional design diagram of the formed K-G interpenetrating inner core structure is shown in FIG. 4. Figure 4 The partial physical diagram of the printed inner core structure is shown in FIG. 5. Figure 5 The Kagome unit structure is a prior art.
[0023] Embodiment 3 A preparation method of an impact-resistant protective structure based on additive manufacturing forming, comprising the following steps: S1, constructing a three-dimensional model of a product, the three-dimensional model comprising an inner core structure and a sealing layer wrapped around the four sides of the inner core structure; the inner core structure is composed of a plurality of Gyroid unit structures; the Gyroid unit structure has 2 flow channels that are not connected to each other; the corresponding flow channels of two adjacent Gyroid unit structures of the inner core structure are connected; at least one flow channel of the inner core structure is filled with a fluid; the sealing layer has a corresponding filling port reserved at a corresponding position for each of the two flow channels. In another embodiment, the inner core structure further comprises a plurality of Kagome unit structures; the Kagome unit structure penetrates the interior of the Gyroid structure, forming a K-G interpenetrating multi-dimensional buffer structure.
[0024] S2, printing the three-dimensional model in step S1 based on additive manufacturing technology; the material of the workpiece can be selected according to the corresponding additive manufacturing method, for example: plastic / polymer material can adopt FDM, SLS, etc.; photosensitive resin material can adopt SLA, DLP, CLIP, etc.; metal and metal matrix composite material can adopt PBF-LB or PBF-EB, BJ, etc.; ceramic material can adopt C-SLA / DLP, etc. S3, polishing the inside and outside of the printed workpiece; S4, filling the flow channel of the inner core structure with a fluid, the fluids filled in the two flow channels can be the same or different; S5, after filling the fluid, sealing the flow channel and keeping a certain pressure in the flow channel.
[0025] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the described embodiments. For those skilled in the art, various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and still fall within the protection scope of the present application.
Claims
1. An impact-resistant protective structure based on additive manufacturing, characterized in that: It includes an inner core structure composed of several Gyroid unit structures and a sealing layer surrounding the inner core structure; each Gyroid unit structure has two non-communicating flow channels; the corresponding flow channels of two adjacent Gyroid unit structures in the inner core structure are connected; at least one flow channel of the inner core structure is filled with fluid; and corresponding filling ports are reserved for the two flow channels at corresponding positions on the sealing layer.
2. The impact-resistant protective structure based on additive manufacturing according to claim 1, characterized in that: The fluids filling the two channels of the inner core structure can be the same or different.
3. The impact-resistant protective structure based on additive manufacturing according to claim 1, characterized in that: The pressure of the fluid filling the two channels of the inner core structure can be the same or different.
4. The impact-resistant protective structure based on additive manufacturing according to any one of claims 1-3, characterized in that: The fluid is air, flame-retardant gas, or water.
5. The impact-resistant protective structure based on additive manufacturing according to any one of claims 1-3, characterized in that: The fluid is a non-Newtonian fluid.
6. The impact-resistant protective structure based on additive manufacturing according to claim 1, characterized in that: The core structure also includes several Kagome unit structures; the Kagome unit structures extend through the interior of the Gyroid structure.
7. The method for preparing the impact-resistant protective structure based on additive manufacturing according to any one of claims 1-6, characterized in that: Includes the following steps: S1. Construct a three-dimensional model of the product, wherein the three-dimensional model includes the core structure and the sealing layer as described in claim 1 or 6; S2. Print out the 3D model from step S1 using additive manufacturing technology; S3. Fill the flow channels of the inner core structure with fluid. The fluids filled in the two flow channels may be the same or different. S4. After filling with fluid, seal the flow channel and maintain a certain pressure inside the flow channel.
8. The method for preparing the impact-resistant protective structure according to claim 7, characterized in that: Step S2 further includes polishing the inside and outside of the printed workpiece.