A tri-stable dual mechanical property carbon fiber triple helix structure for cushioning and vibration reduction

Abstract

The application discloses a carbon fiber three-spiral structure with three stable states and double mechanical properties for buffering and damping, which comprises three carbon fiber composite material thin shells and two connecting pieces for fixing the thin shells, two ends of the three carbon fiber composite material thin shells are respectively connected to the outer sides of the two connecting pieces and are fixed and assembled. The structure has three stable states, two of which are respectively used for impact resistance and damping. By fixing the connecting piece at one end and reversely twisting at the other end, the structure can be switched to another stable state and has the second mechanical property. The double mechanical property makes the structure meet the requirements of impact resistance and damping at the same time, and improves the energy absorption effect and vibration control ability.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, and specifically to a tristable dual mechanical property carbon fiber triple helix structure for buffering and vibration reduction. Background Technology

[0002] Carbon fiber composites have been widely used in various fields, and their lightweight, high strength, and excellent mechanical properties make them an ideal structural material. Their use is particularly important in applications requiring impact resistance and vibration damping. However, traditional carbon fiber composite structures typically have fixed mechanical properties and cannot flexibly adapt to different impact and vibration conditions.

[0003] Most existing structures can only meet one of the requirements, making it difficult to simultaneously achieve the dual functions of shock resistance and vibration reduction. For example, some structural designs rely on material fracture to absorb impact energy, but this method usually cannot provide effective vibration reduction, and once failure occurs, the reliability and service life of the structure will also be affected.

[0004] The triple helix structure made of carbon fiber composite material possesses tristable dual mechanical properties and can be used for shock absorption and vibration reduction. This structure includes connectors and a thin shell of carbon fiber composite material attached to the outside of the connectors. The carbon fiber composite shell is symmetrically laid out at a specified ply angle. This layup method gives the structure two mechanical properties, which can be switched according to the requirements of the application. Furthermore, by changing the carbon fiber parameters of the carbon fiber composite shell, the mechanical properties of the triple helix structure can be changed accordingly. Summary of the Invention

[0005] The purpose of this invention is to overcome the difficulty that a single structure cannot simultaneously provide both impact resistance and vibration reduction functions, and to provide a carbon fiber composite triple helix structure with innovative design and switchable mechanical properties, thus offering a new solution for impact resistance and vibration reduction applications.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A tristable dual-mechanical-property carbon fiber triple helix structure for buffering and vibration reduction includes three carbon fiber composite shells and two connectors for fixing the shells. The two ends of the three carbon fiber composite shells are respectively connected to the outside of the two connectors and are fixedly assembled.

[0008] Furthermore, the carbon fiber composite thin shell is made of T700 unidirectional carbon fiber prepreg, cut into rectangles according to [α n1 / β n2 / α n1The layers are laid symmetrically, where the Greek letters α and β represent the ply angles, and the subscripts n1 and n2 represent the number of layers.

[0009] Furthermore, the laid carbon fibers are placed in a circular tube mold and cured under high temperature and pressure in an autoclave to obtain a prestressed carbon fiber composite thin shell.

[0010] Furthermore, the connector adopts a trident star structure, and the two trident star structure connectors are arranged parallel and coaxially.

[0011] Furthermore, the connector is made of resin using a photopolymer 3D printer.

[0012] Furthermore, the carbon fiber composite shell and the connector are assembled and fixed using self-tapping screws.

[0013] Furthermore, the carbon fiber composite shell is fixed to the connector, and after applying a longitudinal load or performing reverse torsion, it achieves the switching between two other different steady states, namely, switching from the first steady state to the second steady state or switching from the first steady state to the third steady state.

[0014] Furthermore, the first steady state is the initial stable state in which the three carbon fiber composite shells are left-handed; the second steady state is the state when the distance between the two connectors is compressed to the limit after a longitudinal load is applied; the third steady state is the stable state in which the three carbon fiber composite shells are converted to right-handed after reverse torsion, and the structure exhibits an elastic state under the action of the carbon fiber composite shells.

[0015] Furthermore, the strength and stiffness of the carbon fiber composite shell can be adjusted by changing parameters such as the carbon fiber layup angle, thickness, and geometric dimensions.

[0016] Furthermore, the carbon fiber composite shell is flattened and fixed by two acrylic plates, and round holes for fixing and assembly are drilled using an electric drill.

[0017] Compared with existing structures, the superior effects of the present invention are:

[0018] 1) Dual Mechanical Properties: The structure of this invention has three steady states, two of which are used for impact resistance and vibration reduction, respectively. By fixing the connector at one end and torturing it in the opposite direction at the other end, it can switch to another steady state and possess the second mechanical property. This dual mechanical property allows the structure to simultaneously meet the requirements of impact resistance and vibration reduction, improving energy absorption and vibration control capabilities.

[0019] 2) Switchability and Adaptability: Because the structure of this invention possesses two different mechanical properties, it can be switched according to different applications and requirements. By fixing the connector at one end and twisting the other end, the steady state of the structure can be quickly switched to adapt to different impact and vibration conditions. This switchability and adaptability make the structure more flexible and diverse, capable of meeting the needs of applications in different fields.

[0020] 3) Adjustable carbon fiber parameters: By changing the carbon fiber parameters of the carbon fiber composite shell, such as fiber type, number of layers, and angle, the strength and stiffness of the carbon fiber composite shell can be adjusted to adapt to different impact and vibration conditions. This means that the carbon fiber composite shell can be disassembled and replaced according to specific needs, achieving a triple helix structure with different cushioning effects. This adjustability allows the structure to flexibly respond to various cushioning requirements, reducing operating costs. Attached Figure Description

[0021] Figure 1 These are schematic diagrams of three steady states of the triple helix structure of the [203 / 02 / 203] layup of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the circular tube mold of the present invention;

[0023] Figure 3 This is a schematic diagram of the carbon fiber composite thin-shell clamp of the present invention;

[0024] Figure 4 This is a schematic diagram of the connector structure of the present invention;

[0025] Figure 5 This is a load-displacement curve diagram of a triple helix structure;

[0026] In the diagram: 1. Carbon fiber composite thin shell; 2. Connector; 3. Self-tapping screw. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings. This detailed description is a description in conjunction with exemplary embodiments of the invention, including various details of the embodiments, and is limited to the explanation of this invention to aid understanding.

[0028] like Figure 1 As shown, a carbon fiber triple helix structure with tristable dual mechanical properties for buffering and vibration reduction includes connectors and carbon fiber composite shells connected to the outside of the connectors. The triple helix structure consists of three carbon fiber composite shells 1, two connectors 2 for fixing the shells, and is fixedly assembled using six self-tapping screws 3.

[0029] The carbon fiber composite shell is made of T700 / epoxy resin prepreg. The refrigerated prepreg needs to be placed in a room temperature environment to warm up. After the condensation has completely disappeared, the carbon fiber prepreg is cut into 10*110mm rectangles using a paper cutter and laid in 8 layers in the order of [203 / 02 / 203].

[0030] Clean the 150mm diameter round tube mold with alcohol to remove stains from the mold surface. (The round tube mold is shown in the image.) Figure 2 As shown. Subsequently, carbon fiber prepreg is laid sequentially according to the [203 / 02 / 203] layup angle, and Teflon tape is applied to the mold surface where the mold contacts the carbon fiber composite shell to facilitate demolding after the carbon fiber composite shell is formed.

[0031] After laying, place it in an autoclave and adjust the curing temperature and time according to design requirements. In this example, the curing temperature is set to 150℃ and the curing time is set to 2 hours, followed by air cooling.

[0032] like Figure 3 The image shows a carbon fiber composite thin-shell clamp, constructed from two acrylic plates of equal geometric dimensions and three bolts. It is used to clamp, fix, and flatten the carbon fiber composite thin shell, ensuring that the shell does not easily shift or crack due to uneven stress during drilling. A 2mm circular hole between the two acrylic plates is used for drilling. According to design requirements, 2mm diameter circular holes are drilled into the carbon fiber composite thin shell at 70mm intervals, with 20mm pre-drilled holes at each end.

[0033] The triple-helix connector is manufactured using a photosensitive resin 3D printer, such as... Figure 4 The diagram shows the structure of the connector. The ends of the connectors are rounded by 3mm to reduce friction between the carbon fiber composite shell and the connector when it is deformed under load.

[0034] The carbon fiber composite shell and connector are screwed into the 1.9mm inner hole at the end of the connector using six 2mm diameter self-tapping screws with an interference fit.

[0035] In practical applications, due to the layup angle of the carbon fiber composite thin shell [203 / 02 / 203], the triple helix structure exhibits two different mechanical properties. When one end of the connector is fixed, the entire structure presents... Figure 1 The first steady state shown exhibits specific mechanical properties and impact resistance. When the structure is subjected to reverse torsion, it deforms and switches to the third steady state, simultaneously acquiring different mechanical properties and vibration reduction performance. This switching mechanism brings additional flexibility and adaptability to the carbon fiber composite triple helix structure.

[0036] like Figure 5 The diagram shows the load-displacement curves of a triple-helix structure. It reveals that under the first mechanical property condition, the load increases with increasing displacement, exhibiting positive stiffness. Subsequently, as displacement increases further, the load decreases, exhibiting negative stiffness. The structure then transitions from... Figure 1 The transition from the first steady state to the second steady state is shown. Under the second mechanical property, the load on the structure increases with the increase of displacement. When unloading is performed, the compressed triple helix structure will quickly return to the third steady state.

[0037] In the process of preparing carbon fiber composite thin shells, the strength and stiffness of the carbon fiber composite thin shells can be adjusted by changing the carbon fiber parameters, such as fiber type, number of layers and angle, so as to further adjust the mechanical properties and buffering effect of the structure, adapt to different impact and vibration conditions, and meet the usage costs of different buffering requirements.

[0038] The tristable dual mechanical properties of the carbon fiber composite triple helix structure for cushioning and vibration reduction allow for disassembly using self-tapping screws, enabling the replacement of the carbon fiber composite shell. This allows the structure to be adjusted for different energy absorption needs, adapting to varying cushioning requirements. By replacing the carbon fiber composite shell with different parameters, triple helix structures with varying cushioning effects can be achieved, thereby reducing the cost of using them to meet different cushioning needs.

[0039] This embodiment, by altering the carbon fiber parameters of the carbon fiber composite shell and incorporating a detachable design, achieves an adjustable mechanical structure and energy absorption effect, adapting to various impact and vibration conditions and providing a flexible and cost-effective solution. The structure is small in size, simple in design, easy to control, and possesses high performance and adaptability, making it promising for widespread application in engineering practice.

[0040] The exemplary embodiments provided above are merely preferred embodiments of the present invention and do not limit the present invention. Those skilled in the art can make reasonable adjustments and changes to the selection of materials, structural design, and parameter adjustments according to specific requirements to meet specific needs and leverage the advantages of the present invention. All such modified and varied embodiments should be included within the scope of protection of the present invention, thereby allowing adaptation to different needs and application scenarios.

Claims

1. A tristable dual-mechanical-property carbon fiber triple-helix structure for buffering and vibration reduction, characterized in that, It includes three carbon fiber composite shells (1) and two connectors (2) for fixing the shells. The two connectors (2) are an upper connector and a lower connector. One end of the three carbon fiber composite shells (1) is connected to the outside of the upper connector and the other end is connected to the outside of the lower connector, and they are fixedly assembled. The carbon fiber composite shell (1) is made of T700 unidirectional carbon fiber prepreg, cut into rectangles, and laid symmetrically according to [203 / 02 / 203]. The connector adopts a three-pronged star structure, and the two three-pronged star connectors are arranged parallel and coaxially, with the three prongs staggered. By applying a longitudinal load or performing reverse torsion through a connector fixed at one end, the switching between two other different steady states can be achieved, namely, switching from the first steady state to the second steady state or switching from the first steady state to the third steady state. The first steady state is the initial stable state of the three carbon fiber composite shells (1) rotating to the left; the second steady state is the state when the distance between the two connectors is compressed to the limit after the longitudinal load is applied; the third steady state is the stable state of the three carbon fiber composite shells (1) rotating to the right after the reverse torsion, and the structure exhibits an elastic state under the action of the carbon fiber composite shells. Three carbon fiber composite shells (1) and two connectors (2) constitute a triple helix structure. Under the first mechanical property, the load of the triple helix structure increases with the increase of displacement, exhibiting positive stiffness characteristics. After that, the load decreases with the increase of displacement, exhibiting negative stiffness characteristics. The triple helix structure transitions from the first steady state to the second steady state. Under the second mechanical property, the load of the triple helix structure increases with the increase of displacement. When unloading is performed, the compressed triple helix structure will quickly return to the third steady state.

2. The carbon fiber triple helix structure with tristable dual mechanical properties for buffering and vibration reduction according to claim 1, characterized in that, The laid carbon fiber is placed in a round tube mold and cured under high temperature and high pressure in a hot autoclave to obtain a prestressed carbon fiber composite thin shell (1).

3. The carbon fiber triple helix structure with tristable dual mechanical properties for buffering and vibration reduction according to claim 1, characterized in that, The connector (2) is made of resin using a photopolymer 3D printer.

4. The carbon fiber triple helix structure with tristable dual mechanical properties for buffering and vibration reduction according to claim 1, characterized in that, The carbon fiber composite shell (1) and the connector (2) are assembled and fixed using self-tapping screws (3).

5. A tristable dual-mechanical-property carbon fiber triple-helix structure for buffering and vibration reduction according to claim 1, characterized in that, The strength and stiffness of the carbon fiber composite shell (1) can be adjusted by changing the carbon fiber layup angle, thickness, and geometric parameters.

6. A tristable dual-mechanical-property carbon fiber triple-helix structure for buffering and vibration reduction according to claim 1, characterized in that, The carbon fiber composite shell (1) is flattened and fixed by two acrylic plates, and a round hole for fixing assembly is drilled using an electric drill.

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