Adjustable design method and system for strength Poisson's ratio of continuous fiber reinforced composite material

Abstract

The invention belongs to the field of lattice structure design, and particularly discloses a continuous fiber reinforced composite material strength Poisson's ratio adjustable design method and system.The design method comprises the steps that the Poisson's ratio structure type needed by a continuous fiber reinforced composite material component to be prepared is determined, the Poisson's ratio structure type comprises a zero Poisson's ratio structure, a positive Poisson's ratio structure or a negative Poisson's ratio structure; according to the method, regular hexagonal unit cell models and hourglass-shaped hexagonal unit cell models are constructed, and according to the Poisson's ratio structure type, a plurality of regular hexagonal unit cell models and / or a plurality of hourglass-shaped hexagonal unit cells are utilized to construct a corresponding honeycomb porous structure model, so that the Poisson's ratio adjustable design of the continuous fiber reinforced composite material is realized. By means of the method, standardized design of material structures of high-strength, light-weight, vibration-reducing and energy-absorbing parts needed by various parts in different application fields can be achieved.

Description

Technical Field

[0001] The present application belongs to the field of lattice structure design, and more specifically, to a design method and system for adjustable Poisson's ratio of continuous fiber reinforced composite materials. Background Art

[0002] Continuous fiber reinforced composite materials are materials made by combining fibers with resin and other matrices after a series of heat treatments. They have high strength, good heat resistance, excellent corrosion resistance and radiation resistance, and are materials with excellent mechanical properties. The current development trend of fiber reinforced composite components is lightweight, complex, and integrated. Lattice structures are widely used in various fields, such as aerospace, shipbuilding, and automobiles. In many engineering structure designs in these fields, the demand for high-strength, light-weight, vibration-absorbing and energy-absorbing components is increasing day by day. However, the existing material structure and the corresponding design method cannot simultaneously meet the requirements of multiple application fields for high-strength, light-weight, vibration-absorbing and energy-absorbing components, nor can they achieve standardized design of material structures with different needs. Summary of the invention

[0003] In view of the defects of the prior art, the purpose of this application is to provide a design method and system for adjustable Poisson's ratio of continuous fiber reinforced composite materials, aiming to solve the problem that the existing lattice structure design method cannot meet the requirements of arbitrarily adjusting its mechanical properties and it is difficult to meet the different requirements of lattice structure performance in different scenarios.

[0004] To achieve the above objectives, the present application provides a design method for adjusting the strength Poisson's ratio of a continuous fiber reinforced composite material, comprising: S1 determining a Poisson's ratio structure type required for a continuous fiber reinforced composite material component to be prepared, wherein the Poisson's ratio structure type includes a zero Poisson's ratio structure, a positive Poisson's ratio structure, or a negative Poisson's ratio structure; S2 constructs a regular hexagonal unit cell model and an hourglass-shaped hexagonal unit cell model. According to the Poisson's ratio structure type, a corresponding honeycomb porous structure model is constructed using a plurality of the regular hexagonal unit cell models and / or a plurality of the hourglass-shaped hexagonal unit cells to achieve an adjustable Poisson's ratio design of the continuous fiber reinforced composite material.

[0005] The present application can realize the standardized design of the material structure of high-strength, light-weight, vibration-damping and energy-absorbing components required for various components in different application fields. By adjusting the combination of hexagonal unit cells with the same or different structures, the actual needs of actual components for the material structure can be met. The design method has a wide range of applications and a high degree of standardization.

[0006] Furthermore, in step S2, the short side length of the hourglass-shaped hexagonal unit cell is equal to the side length of the regular hexagonal unit cell model, and a pair of obtuse internal angles of the hourglass-shaped hexagonal unit cell are 240° respectively. The structural advantage of the regular hexagonal unit cell is that it has good shear resistance and energy absorption characteristics, and its simple geometric shape is easy to manufacture and process; the structural advantage of the hourglass-shaped hexagonal unit cell is that it has good vibration reduction and impact resistance; the hollow geometric shapes of the above two hexagonal unit cell structures make the components lighter in weight.

[0007] Furthermore, in step S2, when the component type is a positive Poisson's ratio structure, a plurality of the regular hexagonal unit cell models are nested and connected in sequence to form a honeycomb porous structure model, and there is no gap at the connection between adjacent regular hexagonal unit cell models.

[0008] Furthermore, when the component type is a negative Poisson's ratio structure, a plurality of hourglass-shaped hexagonal unit cell models are nested and connected in sequence to form the honeycomb porous structure model, and there is no gap at the connection between adjacent hourglass-shaped hexagonal unit cell models.

[0009] Furthermore, when the component type is a zero Poisson's ratio structure, the short sides of the regular hexagonal unit cell model and the hourglass-shaped hexagonal unit cell model are nested and connected to form a combined cell body, and multiple combined cell bodies are nested and connected to obtain the honeycomb porous structure model, wherein the array formed by the regular hexagonal unit cells connected to each other and the array formed by the hourglass-shaped hexagonal unit cells connected to each other are arranged alternately.

[0010] Furthermore, in step S3, the fiber-reinforced composite material is carbon fiber, aramid fiber or glass fiber.

[0011] Furthermore, the Poisson's ratio of the Poisson's ratio structure type ranges from -1.5 to 1.5. Within this value range, the number and size of the hexagonal unit cells can be arbitrarily changed, and the corresponding Poisson's ratio material structure prepared can meet the Poisson's ratio requirements obtained by the initial analysis and will not exceed the required value.

[0012] Furthermore, the fiber reinforced composite material has a diameter of 0.4 mm to 1.0 mm.

[0013] Furthermore, in step S1, the Young's modulus corresponding to the zero Poisson's ratio structure is 10MPa-20MPa; the Young's modulus corresponding to the positive Poisson's ratio structure is 5MPa-10MPa; and the Young's modulus corresponding to the negative Poisson's ratio structure is 15MPa-20MPa. If the corresponding numerical range is exceeded, the material structure will be difficult to print.

[0014] According to another aspect of the present application, a design system for implementing the design method for adjustable Poisson's ratio of continuous fiber reinforced composite material strength as described in any one of the above items is also provided, the design system comprising: A Poisson's ratio calculation module, used to determine the Poisson's ratio structure type required for the continuous fiber reinforced composite material component to be prepared, wherein the Poisson's ratio structure type includes a zero Poisson's ratio structure, a positive Poisson's ratio structure or a negative Poisson's ratio structure; The three-dimensional model construction module is used to construct a regular hexagonal unit cell model and an hourglass-shaped hexagonal unit cell model, and adjust the arrangement of multiple regular hexagonal unit cell models and / or multiple hourglass-shaped hexagonal unit cells to obtain a honeycomb porous structure model that meets the corresponding Poisson's ratio structure type.

[0015] According to another aspect of the present application, a method for preparing a continuous fiber reinforced composite material with an adjustable strength Poisson's ratio is also provided, comprising: designing a desired honeycomb porous structure model according to the method of the aforementioned steps S1-S2; then selecting a continuous fiber reinforced composite material, and performing additive manufacturing according to the honeycomb porous structure model using a fused deposition modeling technique to obtain a continuous fiber reinforced composite material structure.

[0016] Furthermore, the fiber reinforced composite material has a diameter of 0.4 mm to 1.0 mm.

[0017] In general, the above technical solutions conceived by this application have the following beneficial effects compared with the prior art: (1) In the design method for adjustable strength Poisson's ratio of continuous fiber reinforced composite materials provided in the present application, the required Poisson's ratio is first calculated according to the actual application scenario, and then the required Poisson's ratio structure type is determined according to the corresponding Poisson's ratio. A regular hexagonal unit cell model and an hourglass-shaped hexagonal unit cell model are combined and nested to generate a corresponding zero Poisson's ratio structure, a positive Poisson's ratio structure or a negative Poisson's ratio structure. By adjusting the arrangement and number of hexagonal unit cells of the same or different shapes, a greater degree of design freedom is achieved, making the obtained components easier to apply in actual scenarios.

[0018] (2) This application uses continuous fiber composite materials for additive manufacturing to obtain zero Poisson's ratio structure, positive Poisson's ratio structure or negative Poisson's ratio structure, which can make the component entities of various Poisson's ratio structures transition evenly everywhere, and can more efficiently prepare complex lattice structures compared with traditional manufacturing technologies.

[0019] (3) The design method provided in this application can be applied to the structural design of components required in a variety of application scenarios, such as the casing of some precision instruments, which requires to avoid mechanical deformation affecting its accuracy, and thus can match the zero Poisson's ratio structure provided by this design method; bearings and bolts are required to withstand large tensile stress, and thus can match the positive Poisson's ratio structure provided by this design method; aerospace, automobile and other fields require lightweight and high-strength anti-collision structures, and thus can match the negative Poisson's ratio structure provided by this design method; the corresponding Poisson's ratio structure can be efficiently obtained by combining the design of the same or different unit cell structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flow chart of a method for designing a continuous fiber reinforced composite material with adjustable strength Poisson's ratio provided in an embodiment of the present application; Figure 2 This is a practical application flow chart of the method for designing the adjustable Poisson's ratio of the strength of a continuous fiber reinforced composite material provided in an embodiment of the present application; Figure 3 This is a schematic diagram of the change of the hexagonal unit cell provided in the embodiment of the present application; Figure 4 is a schematic diagram of a positive Poisson's ratio structure provided in an embodiment of the present application; Figure 5 is a schematic diagram of a negative Poisson's ratio structure provided in an embodiment of the present application; Figure 6 It is a schematic diagram of a zero Poisson's ratio structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] The term "and / or" in this article is a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The symbol " / " in this article indicates that the associated objects are in an or relationship, for example, A / B means A or B.

[0023] The terms "first" and "second" in the specification and claims herein are used to distinguish different objects rather than to describe a specific order of the objects. For example, a first response message and a second response message are used to distinguish different response messages rather than to describe a specific order of the response messages.

[0024] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0025] In the description of the embodiments of the present application, unless otherwise specified, "multiple" means two or more than two. For example, multiple processing units refer to two or more processing units, etc.; multiple elements refer to two or more elements, etc.

[0026] The present application provides a method for designing a continuous fiber reinforced composite material with an adjustable Poisson's ratio. Figure 1 and Figure 2 As shown, the design method process includes: S1 Analyze the Poisson's ratio structure type required for the continuous fiber reinforced composite component to be prepared according to the actual application scenario. The Poisson's ratio structure type includes a zero Poisson's ratio structure, a positive Poisson's ratio structure or a negative Poisson's ratio structure.

[0027] Specifically, the Poisson's ratio, strength and Young's modulus required for a continuous fiber reinforced composite material component having the Poisson's ratio structure type are determined, and the unit cell structure type is selected.

[0028] Positive Poisson's ratio structures deform laterally and expand outward when under pressure, and are more suitable for bearing tensile stress. For example, bearings and bolts are required to withstand larger tensile stresses, requiring a Poisson's ratio of 0.5 to 1.5. The Young's modulus required for such structures is 5 MPa to 10 MPa, such as 5 MPa, 6 MPa, 6.5 MPa, 7 MPa, 8 MPa, 9.51 MPa, 10 MPa, etc., or any value between any two of the above Young's modulus values.

[0029] The zero Poisson's ratio structure has almost no lateral deformation when under pressure, and is suitable for structures that require stability under high stress conditions. For example, the shell of some precision instruments requires a Poisson's ratio of zero. The Young's modulus corresponding to this type of zero Poisson's ratio structure is designed to be 10MPa-20MPa, such as 10MPa, 11MPa, 12MPa, 13MPa, 14MPa, 15MPa, 16MPa, 17MPa, 18MPa, 19MPa, 20MPa, etc., or any value between any two of the above Young's modulus values.

[0030] Negative Poisson's ratio structures are suitable for aerospace, automotive and other fields, requiring lightweight and high-strength anti-collision structures, requiring a Poisson's ratio of -0.5 to -1.5, and a Young's modulus of 15 to 20 MPa, such as 15MPa, 16MPa, 17MPa, 18MPa, 19MPa, 20MPa, etc., or any value between any two of the above Young's modulus values.

[0031] The Poisson's ratios of the regular hexagonal unit cell provided in this embodiment and the hourglass-shaped hexagonal unit cell obtained by deforming the regular hexagonal unit cell satisfy the following conditions.

[0032] If a positive Poisson's ratio structure is constructed, when it is compressed in the y direction, its Poisson's ratio in the x direction is:

[0033] in, is the Poisson's ratio in the x direction, K represents the arm shear deformation coefficient, ν Poisson's ratio representing the material structure, deformation angle θ is 30°, l is the side length of the regular hexagonal unit cell, t is the required regular hexagonal cell wall thickness.

[0034] When the aforementioned + θ becomes -θ When (i.e. Figure 3 When the regular hexagonal unit cell changes into an hourglass-shaped hexagonal unit cell, the + θ becomes - in the middle picture θ ), the traditional regular hexagonal unit cell 1 is transformed into an hourglass-shaped hexagonal unit cell 2, and exhibits a negative Poisson's ratio effect. On this basis, a Figure 3 The combined cell body 3 with zero Poisson's ratio in the right figure.

[0035] When the zero Poisson's ratio structure is compressed in the y direction, the deformation of each zero Poisson's ratio unit cell (i.e., hourglass-shaped hexagonal unit cell) in the y direction is:

[0036] in, u y is the deformation of the zero Poisson's ratio unit cell in the y direction, is the total strain in the y direction for a zero Poisson's ratio structure, l is the side length of the regular hexagonal unit cell and also the short side length of the hourglass-shaped hexagonal unit cell.

[0037] The total strain in the y direction of a zero Poisson's ratio structure is expressed as:

[0038] The overall strain of the zero Poisson's ratio structure in the x-direction can be expressed as:

[0039] in, is the overall strain in the x-direction for a zero Poisson's ratio structure.

[0040] because ε x =−v yx ε y The Poisson's ratio of the zero Poisson's ratio structure in the x direction can be expressed as:

[0041] in, v yx is the Poisson's ratio of the zero Poisson's ratio structure in the X direction.

[0042] S2 constructs a regular hexagonal unit cell model and an hourglass-shaped hexagonal unit cell model according to the selected unit cell structure type, and adjusts the arrangement of multiple regular hexagonal unit cell models and multiple hourglass-shaped hexagonal unit cells, adjusts the number and arrangement of multiple regular hexagonal unit cell models, or adjusts the number and arrangement of multiple hourglass-shaped hexagonal unit cells to obtain a honeycomb porous structure model that satisfies the corresponding Poisson's ratio structure type.

[0043] Figure 3 1 is a schematic diagram of the structural change of the hexagonal unit cell provided in this embodiment. After the regular hexagonal unit cell 1 is deformed, the hourglass-shaped hexagonal unit cell 2 is obtained. After the unit cell 1 and the unit cell 2 are combined, a combined cell body 3 can be obtained. In this embodiment, the short side length of the hourglass-shaped hexagonal unit cell 2 is equal to the side length of the regular hexagonal unit cell 1, and a pair of obtuse internal angles of the hourglass-shaped hexagonal unit cell 2 are α They are 240° respectively, so that the hourglass-shaped hexagonal unit cell 2 and the regular hexagonal unit cell 1 can be nested together to achieve seamless connection.

[0044] like Figure 4-6 As shown, there are three Poisson's ratio lattice structures composed of the aforementioned hexagonal unit cells and combined unit cells, among which: Figure 4 The positive Poisson's ratio structure in is composed of multiple regular hexagonal unit cells (hereinafter referred to as unit cell 1); Figure 5 The negative Poisson's ratio structure in is obtained by forming an array of multiple hourglass-shaped hexagonal unit cells (hereinafter referred to as unit cells 2); Figure 6 The zero Poisson's ratio structure in the figure is obtained by alternately nesting and connecting the combined cell bodies 3 formed by the combination of unit cells 1 and 2 into an array.

[0045] Combination Figure 2 As shown in the figure, after analyzing the application scenario requirements of different Poisson's ratios, mathematical modeling software (such as MATLAB) is used to construct the following Figure 4-6 Any of the honeycomb porous structure models shown, and then output the honeycomb porous structure model in STL file format. Then import the STL file into the FDM (fused deposition modeling) forming equipment, use the fused deposition modeling technology to stack and print layer by layer, and finally get a honeycomb porous structure consistent with the design model, and apply the corresponding honeycomb porous structure to the preparation of parts, realizing the full-process efficient design method of analyzing application scenarios, adjusting the design structure based on application scenarios and building models, additive manufacturing based on models, and applying the printed structure to actual applications.

[0046] Specifically, when the component type selected in step S1 is a positive Poisson's ratio structure, a regular hexagonal unit cell model is constructed, and multiple regular hexagonal unit cell models are nested and connected in sequence to form a honeycomb porous structure model, and there is no gap at the connection between adjacent regular hexagonal unit cell models, thereby obtaining a zero Poisson's ratio structure; When the component type selected in step S1 is a negative Poisson's ratio structure, an hourglass-shaped hexagonal unit cell model is constructed, and multiple hourglass-shaped hexagonal unit cell models are nested and connected in sequence to form a honeycomb porous structure model, and there is no gap at the connection between adjacent hourglass-shaped hexagonal unit cell models, thereby obtaining a negative Poisson's ratio structure.

[0047] When the component type selected in step S1 is a zero Poisson's ratio structure, a single regular hexagonal unit cell model is connected to a single hourglass-shaped hexagonal unit cell model by their short sides to form a combined cell body 3, and then a plurality of combined cell bodies 3 are nested and connected to form a honeycomb porous structure model, and an array formed by a plurality of regular hexagonal unit cells connected to each other and an array formed by a plurality of hourglass-shaped hexagonal unit cells connected to each other in the honeycomb porous structure model are alternately arranged and connected, and there is no gap at the junction of adjacent arrays, thereby obtaining a zero Poisson's ratio structure.

[0048] In other preferred embodiments, after the desired honeycomb porous structure model is designed in steps S1-S2 of the aforementioned embodiment, the STL file of the honeycomb porous structure model is input into the additive printing device, and continuous fiber reinforced composite materials are selected, and additive manufacturing is performed using fused deposition modeling technology, etc., to obtain a continuous fiber reinforced composite material structure. The required parts are directly prepared using the material structure manufactured by additive manufacturing. Since the design process of the material structure has fully considered the Poisson's ratio, yield strength, etc. required for the parts, the use of additive manufacturing can better prepare the designed complex structure, with high material utilization, and the use of additive manufacturing can enable the fiber composite material to better retain the characteristics of high toughness and high strength of the fiber.

[0049] In this embodiment, the fiber-reinforced composite material is determined to be carbon fiber, aramid fiber or glass fiber, and the diameter of the fiber-reinforced composite material is 0.4mm to 1.0mm, such as 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc., or it can be any value between any two of the above values. Carbon fiber reinforced composite materials emphasize high strength, high stiffness and light weight, have good fatigue performance, and are suitable for high-performance requirements. Aramid fiber reinforced composite materials have the advantages of impact resistance, high temperature resistance and toughness, and can be widely used in protection and high temperature environments; glass fiber reinforced composite materials have the advantages of low cost, corrosion resistance and good insulation, and are suitable for general industrial use and large-scale applications. In general, the above three materials can cover a wide range of application scenarios.

[0050] Specifically, in order to obtain a precision instrument housing, its material structure needs to be a zero Poisson's ratio structure. According to the conditions of zero Poisson's ratio and Young's modulus of 17.38MPa, a zero Poisson's ratio structure is designed. The composition structure of the zero Poisson's ratio structure is: the short sides of the regular hexagonal unit cell model and the hourglass-shaped hexagonal unit cell model are connected to form a combined cell body 3, and then multiple combined cell bodies 3 are nested and connected to form a honeycomb porous structure model. After the zero Poisson's ratio structure model is generated into an STL file and transferred to the FDM device, a PLA resin base with a diameter of 0.55mm is selected for forming and printing, the printing temperature is set to 210℃, and the platform temperature is set to 30℃.

[0051] In order to obtain components such as bearings and bolts, the material structure is required to withstand large tensile stress, and the Poisson's ratio is required to be 0.5-1.5, and the Young's modulus is 9.51MPa. Therefore, a positive Poisson's ratio structure is designed, which is specifically composed of multiple regular hexagonal unit cell structures connected and nested on one side, and there is no gap between adjacent regular hexagonal unit cell structures. After constructing the positive Poisson's ratio structure model, the STL file is output to the FDM equipment, and a PLA resin base with a diameter of 0.45mm is selected. The FDM equipment is used for forming and printing, and the printing temperature is 210℃ and the platform temperature is 30℃.

[0052] In order to prepare aerospace and automotive anti-collision structures, material structures with good flexibility and strong energy absorption characteristics are required. The material structure Poisson's ratio is required to be -1.5~-0.5 and the Young's modulus is 19.89MPa. The negative Poisson's ratio structure is constructed using mathematical modeling software. The negative Poisson's ratio structure is a honeycomb porous structure model composed of multiple hourglass-shaped hexagonal cells nested and connected in sequence, and there is no gap between adjacent hourglass-shaped hexagonal cells. A PLA resin base with a diameter of 0.55mm was selected and formed using FDM equipment. The printing temperature was 210℃ and the platform temperature was 30℃.

[0053] In the embodiments of the present application, various Poisson's ratio structures can be designed to be adjustable. By combining hexagonal unit cell structures of the same or different structures, honeycomb porous structures with different properties can be generated to cope with application scenarios of material structures with Poisson's ratios of different strengths.

[0054] According to another aspect of the present application, a design system for implementing any of the above methods for designing a continuous fiber reinforced composite material with an adjustable strength Poisson's ratio is provided, the design system comprising: Poisson's ratio calculation module, used to analyze the application scenario of the component and determine the required Poisson's ratio structure type as zero Poisson's ratio structure, positive Poisson's ratio structure or negative Poisson's ratio structure; A three-dimensional model construction module is used to construct a regular hexagonal unit cell model and an hourglass-shaped hexagonal unit cell model, and adjust the arrangement of multiple regular hexagonal unit cell models and / or multiple hourglass-shaped hexagonal unit cells to obtain a honeycomb porous structure model that meets the corresponding Poisson's ratio structure type; In a preferred embodiment, the design system is also connected to an additive manufacturing module, which is used to perform additive manufacturing according to a honeycomb porous structure model, using continuous fiber reinforced composite materials and utilizing fused deposition modeling technology to obtain continuous fiber reinforced composite material components.

[0055] It can be understood that the detailed functional implementation of each of the above-mentioned units / modules can be found in the introduction of the aforementioned method embodiment, and will not be repeated here.

[0056] Next, the technical solution provided by this application is introduced in detail through embodiments.

[0057] It should be understood that the above-mentioned device is used to execute the method in the above-mentioned embodiment. The implementation principle and technical effect of the corresponding program module in the device are similar to those described in the above-mentioned method. The working process of the device can refer to the corresponding process in the above-mentioned method, which will not be repeated here.

[0058] Based on the method in the above embodiment, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program runs on a processor, the processor executes the method in the above embodiment.

[0059] Based on the method in the above embodiment, an embodiment of the present application provides a computer program product. When the computer program product runs on a processor, the processor executes the method in the above embodiment.

[0060] It is understandable that the processor in the embodiment of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0061] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, mobile hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC.

[0062] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions may be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)), etc.

[0063] It should be understood that the various numerical numbers involved in the embodiments of the present application are only used for the convenience of description and are not used to limit the scope of the embodiments of the present application.

[0064] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A design method for adjustable Poisson's ratio of continuous fiber reinforced composite materials, characterized in that: include: S1 determining a Poisson's ratio structure type required for a continuous fiber reinforced composite material component to be prepared, wherein the Poisson's ratio structure type includes a zero Poisson's ratio structure, a positive Poisson's ratio structure, or a negative Poisson's ratio structure; S2 constructs a regular hexagonal unit cell model and an hourglass-shaped hexagonal unit cell model. According to the Poisson's ratio structure type, a corresponding honeycomb porous structure model is constructed using a plurality of the regular hexagonal unit cell models and / or a plurality of the hourglass-shaped hexagonal unit cells to achieve an adjustable Poisson's ratio design of the continuous fiber reinforced composite material.

2. The method for designing a continuous fiber reinforced composite material with adjustable Poisson's ratio according to claim 1, characterized in that: In step S2, the short side length of the hourglass-shaped hexagonal unit cell model is equal to the side length of the regular hexagonal unit cell model, and a pair of obtuse internal angles of the hourglass-shaped hexagonal unit cell model are respectively 240°.

3. The method for designing a continuous fiber reinforced composite material with adjustable strength Poisson's ratio according to claim 2, characterized in that: In step S2, when the component type is a positive Poisson's ratio structure, a plurality of the regular hexagonal unit cell models are nested and connected in sequence to form a honeycomb porous structure model, and there is no gap at the connection between adjacent regular hexagonal unit cell models.

4. The method for designing a continuous fiber reinforced composite material with adjustable strength Poisson's ratio according to claim 2, characterized in that: When the component type is a negative Poisson's ratio structure, a plurality of hourglass-shaped hexagonal unit cell models are nested and connected in sequence to form the honeycomb porous structure model, and there is no gap at the connection between adjacent hourglass-shaped hexagonal unit cell models.

5. The method for designing a continuous fiber reinforced composite material with adjustable strength Poisson's ratio according to claim 2, characterized in that: When the component type is a zero Poisson's ratio structure, the short sides of the regular hexagonal unit cell model and the hourglass-shaped hexagonal unit cell model are nested and connected to form a combined cell body, and multiple combined cell bodies are nested and connected to obtain the honeycomb porous structure model; wherein the array formed by the regular hexagonal unit cells connected to each other and the array formed by the hourglass-shaped hexagonal unit cells connected to each other are arranged alternately.

6. The method for designing a continuous fiber reinforced composite material with adjustable strength Poisson's ratio according to claim 1, characterized in that: In step S3, the fiber-reinforced composite material is carbon fiber, aramid fiber or glass fiber.

7. The method for designing a continuous fiber reinforced composite material with adjustable strength Poisson's ratio according to claim 1, characterized in that: The Poisson's ratio of the Poisson's ratio structure type ranges from -1.5 to 1.

5.

8. The method for designing a continuous fiber reinforced composite material with adjustable Poisson's ratio according to claim 1, characterized in that: In step S1, the Young's modulus corresponding to the zero Poisson's ratio structure is 10MPa-20MPa; The Young's modulus corresponding to the positive Poisson's ratio structure is 5MPa-10MPa; The Young's modulus corresponding to the negative Poisson's ratio structure is 15MPa-20MPa.

9. A design system for implementing the design method for adjustable Poisson's ratio of continuous fiber reinforced composite material according to any one of claims 1 to 8, characterized in that: include: A Poisson's ratio calculation module, used to determine the Poisson's ratio structure type required for the continuous fiber reinforced composite material component to be prepared, wherein the Poisson's ratio structure type includes a zero Poisson's ratio structure, a positive Poisson's ratio structure or a negative Poisson's ratio structure; The three-dimensional model construction module is used to construct a regular hexagonal unit cell model and an hourglass-shaped hexagonal unit cell model, and adjust the arrangement of multiple regular hexagonal unit cell models and / or multiple hourglass-shaped hexagonal unit cells to obtain a honeycomb porous structure model that meets the corresponding Poisson's ratio structure type.

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