A method and device for calculating torsional stiffness of fabric pultruded composite products

Abstract

The present invention discloses a method and device for calculating the torsional stiffness of a fabric pultruded composite material product. The method comprises: determining characteristic parameters of a first product; determining material parameters and fiber layup angles of each ply of the first product; determining the effective shear modulus of each ply of the first product based on the characteristic parameters, material parameters, and fiber layup angles of each ply; and determining the torsional stiffness of the product based on the effective shear modulus of each ply of the first product. The technical solution of the present invention accurately calculates the torsional stiffness of the product while ensuring computational efficiency, thereby avoiding inefficiencies and excessively high costs associated with determining the torsional stiffness of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of torsional stiffness calculation, and in particular to a method and device for calculating the torsional stiffness of a fabric pultruded composite material product. Background Art

[0002] Fabric pultruded composite materials have been widely used in aerospace, automotive, construction, wind power generation and other fields due to their multi-directional fiber laying, high strength and lightweight characteristics.

[0003] However, due to the insufficient torsional stiffness of some textile pultruded composite products, it is necessary to determine the torsional stiffness of textile pultruded composite products before use. Traditional methods rely on finite element numerical simulation or experimental testing to evaluate torsional performance, which is difficult to quickly evaluate and inefficient. Summary of the Invention

[0004] The present invention provides a method and device for calculating the torsional stiffness of a fabric pultruded composite material product, so as to solve the problem that the torsional performance evaluation process cannot be quickly determined.

[0005] According to one aspect of the present invention, a method for calculating the torsional stiffness of a fabric pultruded composite product is provided, the method comprising:

[0006] determining product characteristic parameters of a first product, the first product being made of a fiber-reinforced composite material manufactured by a pultrusion process, the product characteristic parameters including a cross-sectional area of ​​the first product, a centerline length of each ply, and a thickness of each ply;

[0007] Determine the material parameters of each ply and the fiber layup angle of each ply for the first product; the material parameters are determined based on the ply material model; the material parameters include the fiber direction modulus and the equivalent shear modulus; the fiber layup angle is determined with the axial direction of the first product being zero degrees;

[0008] determining an effective shear modulus of each ply of the first product based on product characteristic parameters, material parameters of each ply, and fiber layup angles of each ply;

[0009] The torsional stiffness of the product is determined based on the effective shear modulus of each ply of the first product; the torsional stiffness of the product is used to describe the ability of the first product to resist torsional deformation.

[0010] According to another aspect of the present invention, there is provided a device for calculating the torsional stiffness of a fabric pultruded composite material product, the device comprising:

[0011] a characteristic parameter determination module, configured to determine product characteristic parameters of a first product, the first product being made of a fiber-reinforced composite material manufactured by a pultrusion process, the product characteristic parameters including a cross-sectional area of ​​the first product, a centerline length of each ply, and a thickness of each ply;

[0012] A material parameter determination module is used to determine the material parameters of each ply of the first product and the fiber layup angle of each ply; the material parameters are determined based on the ply material model; the material parameters include the fiber direction modulus and the equivalent shear modulus; the fiber layup angle is determined with the axial direction of the first product being zero degrees;

[0013] a shear modulus determination module, configured to determine an effective shear modulus of each ply of the first product based on product characteristic parameters, material parameters of each ply, and fiber layup angles of each ply;

[0014] The torsional stiffness determination module is used to determine the torsional stiffness of the product based on the effective shear modulus of each ply of the first product; the torsional stiffness of the product is used to describe the ability of the first product to resist torsional deformation.

[0015] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0016] At least one processor; and a memory in communication with the at least one processor; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for calculating the torsional stiffness of a fabric pultruded composite product according to any embodiment of the present invention.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, which are used to cause a processor to implement the method for calculating the torsional stiffness of a fabric pultruded composite material product according to any embodiment of the present invention when executed.

[0018] The technical solution of the embodiment of the present invention determines the product characteristic parameters of the first product; determines the material parameters of each ply of the first product and the fiber layup angle of each ply; determines the effective shear modulus of each ply of the first product based on the product characteristic parameters, the material parameters of each ply and the fiber layup angle of each ply; and finally determines the product torsional stiffness based on the effective shear modulus of each ply of the first product. This can accurately calculate the product torsional stiffness of the fabric pultruded composite material product while ensuring calculation efficiency, thereby avoiding the problems of low efficiency and excessively high cost in determining the product torsional stiffness of the fabric pultruded composite material product.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a flow chart of a method for calculating the torsional stiffness of a fabric pultruded composite material product provided in accordance with the first embodiment of the present invention;

[0022] Figure 2 A flowchart for screening a first product according to a method for calculating torsional stiffness of a fabric pultruded composite product is provided for the second embodiment of the present invention;

[0023] Figure 3 2 is a schematic structural diagram of a device for calculating torsional stiffness of a fabric pultruded composite material product according to a third embodiment of the present invention;

[0024] Figure 4 It is a structural schematic diagram of an electronic device for implementing the method for calculating the torsional stiffness of a fabric pultruded composite material product according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] Example 1

[0028] Figure 1 A flowchart of a method for calculating the torsional stiffness of a fabric pultruded composite material product is provided for the first embodiment of the present invention. This embodiment is applicable to the case where the torsional stiffness of a fabric pultruded composite material product is calculated. The method can be executed by a device for calculating the torsional stiffness of a fabric pultruded composite material product. The device can be implemented in the form of hardware and / or software. The device can be configured in an electronic device with data processing capabilities. Figure 1 As shown, the method includes:

[0029] S110. Determine product characteristic parameters of a first product, where the first product is made of a fiber-reinforced composite material manufactured by a pultrusion process. The product characteristic parameters include a cross-sectional area of ​​the first product, a centerline length of each ply, and a thickness of each ply.

[0030] The first product is a fabric pultruded composite material made from a fiber-reinforced composite material manufactured using a pultrusion process. The first product is manufactured through processing using a reinforcing material and a matrix material. The fiber-reinforced composite material includes at least one of the following: glass fiber, carbon fiber, aramid fiber, etc. The matrix material includes at least one of the following: a resin matrix, a metal matrix, and a ceramic matrix, etc. The resin matrix includes at least one of the following: epoxy resin, polyester resin, vinyl ester resin, etc. The metal matrix includes at least one of the following: aluminum, magnesium, titanium, etc. The fiber-reinforced composite material in the fabric pultruded composite product is arranged in a specific direction. During the pultrusion process, the fiber-reinforced composite material exhibits strong longitudinal strength and stiffness due to its high strength and high modulus. The cross-sectional area of ​​the first product refers to the cross-sectional area of ​​the first product in a direction perpendicular to its length. The centerline length of the layup refers to the length measured along the centerline of the layup shape during the layup process of the first product.

[0031] The first product cross-sectional area may be determined by at least one of the following calculation schemes: direct measurement method, image processing method.

[0032] The method of determining the cross-sectional area of ​​the first product by direct measurement includes:

[0033] Cutting the first product in a direction perpendicular to the length of the first product to obtain a cross section of the first product;

[0034] Determine the length and width of the first product cross section, and determine the first product cross section area based on the length and width.

[0035] The length and width of the first product cross section can be measured by at least one of the following tools: a caliper, a micrometer, etc.

[0036] The centerline length of the ply can be determined by classifying and calculating different ply shapes, including but not limited to at least one of the following: a rectangular ply, a circular ply, and an irregularly shaped ply.

[0037] Optionally, the centerline length of the ply is determined, including:

[0038] If the ply is a rectangular ply, determine the length and width of the ply;

[0039] Determine the centerline length based on the length and width of the ply; the centerline length is half the sum of the length and width.

[0040] Optionally, the centerline length of the ply is determined, including:

[0041] If the ply is a circular ply, determine the radius of the ply;

[0042] Determine the centerline length based on the ply radius;

[0043] Among them, the centerline length and the ply radius π2.

[0044] Optionally, the centerline length of the ply is determined, including:

[0045] If the ply is an irregularly shaped ply, determining the coordinates of a preset number of boundary points in the ply;

[0046] Determine the distance between adjacent boundary points;

[0047] The distances between adjacent boundary points are summed to obtain the centerline length of the ply.

[0048] S120. Determine the material parameters of each ply of the first product and the fiber layup angle of each ply; the material parameters are determined according to the ply material model; the material parameters include the fiber direction modulus and the equivalent shear modulus; the fiber layup angle is determined with the axial direction of the pultrusion of the first product as zero degrees.

[0049] Material parameters are determined by the material used to construct the laminate. These parameters include fiber directional modulus and equivalent shear modulus. Fiber directional modulus refers to the ratio of stress to strain in the fiber's axial direction. A higher fiber directional modulus indicates less deformation under the same external force.

[0050] The axial direction refers to the direction in which the fiber extends. The equivalent shear modulus can be described as the ratio of stress to strain when the fiber is subjected to a shear force. The greater the equivalent shear modulus, the less shear strain the fiber experiences under the same shear force.

[0051] The fiber lay-up angle is the angle between the fiber and the axial direction of the first product.

[0052] S130: Determine an effective shear modulus of each ply of the first product based on product characteristic parameters, material parameters of each ply, and fiber layup angles of each ply.

[0053] The effective shear modulus is the ratio of shear stress to shear strain when a material is subjected to shear force.

[0054] Since the first product cross-sectional area, the centerline length of the laminate, the thickness of the laminate, the material parameters of the laminate and the fiber lay-up angle of the laminate of the first product will have a significant impact on the effective shear modulus of the laminate, the influence coefficient of the first product cross-sectional area, the centerline length of the laminate, the thickness of the laminate, the material parameters of the laminate and the fiber lay-up angle of the laminate on the effective shear modulus of the laminate can be determined through experiments, and the effective shear modulus of the first product laminate can be determined based on the influence coefficient.

[0055] In an optional solution, determining the effective shear modulus of each ply of the first product based on product characteristic parameters, material parameters of each ply, and fiber layup angles of each ply includes:

[0056] Based on the approximate conversion formula of composite material mechanics, the product characteristic parameters, material parameters of each ply, and fiber layup angle of each ply are converted to obtain the effective shear modulus of each ply of the first product.

[0057] The approximate conversion formulas for composite material mechanics are used to calculate various mechanical properties of composite materials under different conditions.

[0058] For the i-th layer, the effective shear modulus can be calculated using the composite material mechanics approximate conversion formula through its fiber layup angle θi and material parameters (modulus E along the fiber direction and matrix or equivalent shear modulus G).

[0059] Among them, the expression of effective shear modulus is:

[0060] ;

[0061] in, represents the effective shear modulus of the i-th layer; E represents the fiber direction modulus; G represents the equivalent shear modulus; represents the fiber ply angle; i represents the i-th layer.

[0062] In one optional solution, based on an approximate conversion formula for composite material mechanics, the product characteristic parameters, the material parameters of each ply, and the fiber layup angle of each ply are converted to obtain the effective shear modulus of each ply of the first product, including steps A1-A2:

[0063] Step A1: Determine the stress-strain relationship of the ply.

[0064] Step A2: Based on the composite material mechanics approximate conversion formula, the stress-strain relationship, product characteristic parameters, material parameters of each ply, and fiber layup angle of each ply are adjusted to obtain the effective shear modulus of the ply.

[0065] Assume that the composite material single layer is an orthotropic material with the main axis direction being the fiber direction 1 and the perpendicular direction being 2. Under its constitutive relation, the stress-strain relationship in the local coordinate system is:

[0066] ;

[0067] in:

[0068] E is the modulus in the fiber direction; E2 is the modulus in the matrix direction; G is the shear modulus; represents the Poisson's ratio of the fiber direction (direction 1) to the perpendicular direction (direction 2); represents the strain in direction 1; represents the strain in 2 directions; represents the shear strain in the 1-2 plane; represents the stress in direction 1; Indicates stress in two directions; represents the shear stress in the 1-2 plane.

[0069] When the ply is pultruded at an angle θ, the deformation direction deviates from the principal axis of the material, which is equivalent to a uniform stiffness and isotropic shear response.

[0070] According to the transformation rule of material stiffness in the rotating coordinate system, the following expression can be obtained:

[0071] ;

[0072] By adjusting the above formula, we can get the expression of the effective shear modulus.

[0073] S140. Determine the product torsional stiffness based on the effective shear modulus of each ply of the first product; the product torsional stiffness is used to describe the ability of the first product to resist torsional deformation.

[0074] After obtaining the effective shear modulus of each ply of the first product, the effective shear moduli of each ply may be superimposed, and the torsional stiffness of the product may be determined based on the superposition result.

[0075] In an optional solution, the product torsional stiffness is determined based on the effective shear modulus of each ply of the first product. The product torsional stiffness is used to describe the ability of the first product to resist torsional deformation, and includes:

[0076] Based on the torsion theory of thin-walled rods, the effective shear modulus of each ply is superimposed to obtain the torsional stiffness of the product.

[0077] The torsion theory of thin-walled bars is a theory that analyzes the mechanical behavior of thin-walled bars under torsion.

[0078] For a closed thin-walled cross-section structure, its unit length torsional stiffness Kt is given by the following formula:

[0079] ;

[0080] Where Am represents the area enclosed by the closed neutral axis (the neutral axis is a closed curve formed by the centerline of the wall thickness); s represents the coordinate of the wall length along the circumference (path integral); t represents the wall thickness; G represents the shear modulus; T represents the torque; Indicates the fiber lay-up angle.

[0081] The cross-section of a first-tier product is often composed of multiple layers (each layer with different angles, thicknesses, and materials). The thin-walled structure is divided into at least one segment along the ply direction. Each segment is numbered i, has a length of si, a thickness of ti, and an equivalent shear modulus of Geff,i.

[0082] So the integral term can be transformed into the form of discrete sum:

[0083] ;

[0084] Based on the torsion theory of thin-walled rods, the layers are superimposed and the overall torsional stiffness Kt can be approximately expressed as:

[0085] ;

[0086] Among them, the denominator is the superposition effect of the equivalent shear deformation of each ply under the torsional load.

[0087] According to the technical solution of the embodiment of the present invention, by determining the product characteristic parameters of the first product; determining the material parameters of each ply of the first product and the fiber layup angle of each ply; determining the effective shear modulus of each ply of the first product based on the product characteristic parameters, the material parameters of each ply and the fiber layup angle of each ply; and finally determining the product torsional stiffness based on the effective shear modulus of each ply of the first product, the product torsional stiffness of the fabric pultruded composite material product can be accurately calculated while ensuring calculation efficiency, thereby avoiding the problems of low determination efficiency and excessively high determination cost when determining the product torsional stiffness of the fabric pultruded composite material product.

[0088] Example 2

[0089] Figure 2 The present invention provides a flowchart for screening the first product according to the method for calculating the torsional stiffness of the fabric pultruded composite material product, such as Figure 2 As shown, the following steps may be included:

[0090] S210: Determine at least one first product.

[0091] S220: Determine the product torsional stiffness of each first product.

[0092] S230: Determine a second first product based on the product torsional stiffness of each first product; the product torsional stiffness of the second first product is within a preset product torsional stiffness range.

[0093] Different application scenarios require different first product torsional stiffnesses. Therefore, a preset product torsional stiffness range is determined for each application scenario. Based on the product torsional stiffnesses of each first product, a first product having a torsional stiffness within the preset product torsional stiffness range is determined as the second first product.

[0094] According to the technical solution of the embodiment of the present invention, by determining at least one first first product; determining the product torsional stiffness of each first first product; determining a second first product based on the product torsional stiffness of each first first product; and ensuring that the product torsional stiffness of the second first product is within a preset product torsional stiffness range, a preliminary screening of fabric pultruded composite materials products can be achieved, thereby reducing the testing time for the fabric pultruded composite materials products required for the application scenario and reducing the waste of testing resources.

[0095] Example 3

[0096] Figure 3 The present invention provides a structural block diagram of a device for calculating the torsional stiffness of a fabric pultruded composite material product. This embodiment is applicable to situations where the torsional stiffness of a product is to be calculated. The device for calculating the torsional stiffness of a fabric pultruded composite material product can be implemented in the form of hardware and / or software. The device for calculating the torsional stiffness of a fabric pultruded composite material product can be configured in an electronic device with data processing capabilities. Figure 3 As shown, the torsional stiffness calculation device of the fabric pultruded composite material product of this embodiment may include: a characteristic parameter determination module 310, a material parameter determination module 320, a shear modulus determination module 330, and a torsional stiffness determination module 340. Among them:

[0097] a characteristic parameter determination module 310 for determining product characteristic parameters of a first product, the first product being made of a fiber-reinforced composite material manufactured by a pultrusion process, the product characteristic parameters including a cross-sectional area of ​​the first product, a centerline length of each ply, and a thickness of each ply;

[0098] A material parameter determination module 320 is configured to determine the material parameters of each ply of the first product and the fiber layup angle of each ply. The material parameters are determined based on the ply material model. The material parameters include the fiber directional modulus and the equivalent shear modulus. The fiber layup angle is determined with the axial direction of the first product being zero degrees.

[0099] a shear modulus determination module 330 for determining an effective shear modulus of each ply of the first product based on product characteristic parameters, material parameters of each ply, and fiber layup angles of each ply;

[0100] The torsional stiffness determination module 340 is configured to determine the torsional stiffness of the first product based on the effective shear modulus of each ply of the first product. The torsional stiffness of the product is used to describe the ability of the first product to resist torsional deformation.

[0101] Based on the above embodiment, optionally, the shear modulus determination module 330 is specifically configured to:

[0102] Based on the approximate conversion formula of composite material mechanics, the product characteristic parameters, material parameters of each ply, and fiber layup angle of each ply are converted to obtain the effective shear modulus of each ply of the first product.

[0103] Based on the above embodiment, optionally, the product characteristic parameters, the material parameters of each ply, and the fiber layup angle of each ply are converted based on the composite material mechanics approximate conversion formula to obtain the effective shear modulus of each ply of the first product, including:

[0104] Determine the stress-strain relationship of the ply;

[0105] Based on the approximate conversion formula of composite material mechanics, the stress-strain relationship, product characteristic parameters, material parameters of each ply, and fiber layup angle of each ply are adjusted to obtain the effective shear modulus of the ply.

[0106] Based on the above embodiment, optionally, the torsional stiffness determination module 340 is specifically configured to:

[0107] Based on the torsion theory of thin-walled rods, the effective shear modulus of each ply is superimposed to obtain the torsional stiffness of the product.

[0108] Based on the above embodiment, optionally, the expression of the effective shear modulus is:

[0109] ;

[0110] in, represents the effective shear modulus of the i-th layer; E represents the fiber direction modulus; G represents the equivalent shear modulus; θ represents the fiber layup angle; i represents the i-th layer.

[0111] Based on the above embodiment, optionally, the expression of the product torsional stiffness is:

[0112] ;

[0113] Wherein, Am is the cross-sectional area of ​​the first product; is the centerline length of the i-th layer of the first product; is the thickness of the i-th ply of the first product; Kt is the torsional stiffness of the product; and n is the total number of plies of the first product.

[0114] The device for calculating the torsional stiffness of a fabric pultruded composite material product provided in an embodiment of the present invention can execute the method for calculating the torsional stiffness of a fabric pultruded composite material product provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0115] Example 4

[0116] Figure 4A schematic diagram of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0117] like Figure 4 As shown, electronic device 10 includes at least one processor 11 and memory, such as read-only memory (ROM) 12 and random access memory (RAM) 13, communicatively connected to at least one processor 11. The memory stores computer programs executable by the at least one processor. Processor 11 can perform various appropriate actions and processes based on the computer programs stored in ROM 12 or loaded from storage unit 18 into RAM 13. RAM 13 can also store various programs and data required for the operation of electronic device 10. Processor 11, ROM 12, and RAM 13 are interconnected via bus 14. An input / output (I / O) interface 15 is also connected to bus 14.

[0118] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0119] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any other suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the method for calculating the torsional stiffness of a fabric pultruded composite product.

[0120] In some embodiments, the method for calculating the torsional stiffness of a fabric pultruded composite product can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the method for calculating the torsional stiffness of a fabric pultruded composite product described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the method for calculating the torsional stiffness of a fabric pultruded composite product via any other suitable means (e.g., via firmware).

[0121] Various embodiments of the systems and techniques described above can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0122] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0123] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or apparatus. A computer-readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media may include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0124] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device that has: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0125] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0126] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0127] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0128] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for calculating the torsional stiffness of a fabric pultruded composite product, characterized in that: include: determining product characteristic parameters of a first product, the first product being made of a fiber-reinforced composite material manufactured by a pultrusion process, the product characteristic parameters including a cross-sectional area of ​​the first product, a centerline length of each ply, and a thickness of each ply; Determining material parameters of each ply of the first product and a fiber layup angle of each ply; the material parameters are determined according to the ply material model; the material parameters include a fiber direction modulus and an equivalent shear modulus; and the fiber layup angle is determined with the axial direction of the pultrusion of the first product as zero degrees; determining an effective shear modulus of each ply of the first product based on the product characteristic parameters, material parameters of each ply, and fiber layup angles of each ply; The torsional stiffness of the product is determined based on the effective shear modulus of each ply of the first product; the torsional stiffness of the product is used to describe the ability of the first product to resist torsional deformation.

2. The method according to claim 1, characterized in that Determining an effective shear modulus of each ply of the first product according to the product characteristic parameters, material parameters of each ply, and a fiber layup angle of each ply includes: Based on the composite material mechanics approximate conversion formula, the product characteristic parameters, the material parameters of each ply, and the fiber layup angle of each ply are converted to obtain the effective shear modulus of each ply of the first product.

3. The method according to claim 2, characterized in that Based on the composite material mechanics approximate conversion formula, the product characteristic parameters, the material parameters of each ply, and the fiber layup angle of each ply are converted to obtain the effective shear modulus of each ply of the first product, including: Determine the stress-strain relationship of the ply; Based on the approximate conversion formula of composite material mechanics, the stress-strain relationship, the product characteristic parameters, the material parameters of each ply, and the fiber layup angle of each ply are adjusted to obtain the effective shear modulus of the ply.

4. The method according to claim 1, wherein Based on the effective shear modulus of each ply of the first product, determine the product torsional stiffness, including: Based on the torsion theory of thin-walled rods, the effective shear modulus of each ply is superimposed to obtain the torsional stiffness of the product.

5. The method according to claim 1, wherein The expression for the effective shear modulus is: ； in, represents the effective shear modulus of the i-th layer; E represents the fiber direction modulus; G represents the equivalent shear modulus; represents the fiber ply angle; i represents the i-th layer.

6. The method according to claim 5, characterized in that The expression of product torsional stiffness is: ； Where, Am is the cross-sectional area of ​​the first product; is the centerline length of the i-th layer of the first product; is the thickness of the i-th ply of the first product; Kt is the torsional stiffness of the product; and n is the total number of plies of the first product.

7. A device for calculating the torsional stiffness of a fabric pultruded composite material product, characterized in that: include: a characteristic parameter determination module, configured to determine product characteristic parameters of a first product, the first product being made of a fiber-reinforced composite material manufactured by a pultrusion process, the product characteristic parameters including a cross-sectional area of ​​the first product, a centerline length of each ply, and a thickness of each ply; a material parameter determination module, configured to determine material parameters of each ply of the first product and a fiber layup angle of each ply; the material parameters are determined based on the ply material model; the material parameters include a fiber directional modulus and an equivalent shear modulus; and the fiber layup angle is determined with the axial direction of the first product being zero degrees; a shear modulus determination module, configured to determine an effective shear modulus of each ply of the first product based on the product characteristic parameters, material parameters of each ply, and fiber layup angles of each ply; The torsional stiffness determination module is configured to determine the torsional stiffness of the product based on the effective shear modulus of each ply of the first product; the torsional stiffness of the product is used to describe the ability of the first product to resist torsional deformation.

8. The device according to claim 7, characterized in that The shear modulus determination module is specifically used to: Based on the composite material mechanics approximate conversion formula, the product characteristic parameters, the material parameters of each ply, and the fiber layup angle of each ply are converted to obtain the effective shear modulus of each ply of the first product.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the method for calculating the torsional stiffness of a fabric pultruded composite product according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for calculating the torsional stiffness of a fabric pultruded composite material product according to any one of claims 1 to 6 when executed.

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