A multi-scale three-dimensional braided composite material cutting process simulation modeling method
By simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials, the problem of the inability to accurately describe the micro-scale material removal mechanism and macro-scale structural damage in existing technologies is solved, thereby improving processing quality and material integrity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CENT SOUTH UNIV
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-26
Smart Images
Figure CN120823925B_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of braided material processing technology, specifically relating to a method and apparatus for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials. Background Technology
[0002] Three-dimensional fiber-braided composite materials possess excellent mechanical properties due to their complex spatial structure and are widely used in aerospace, rail transportation, and defense fields. However, these materials are prone to internal damage during low-speed machining, such as fiber breakage, resin cracking, and interfacial debonding. These defects severely affect the material's mechanical properties and structural integrity. Current research methods on the machining of three-dimensional fiber-braided composite materials mostly focus on a single scale, failing to accurately describe both the microscopic material removal mechanism and the macroscopic structural damage evolution process. Therefore, there is an urgent need for a machining simulation modeling method that can comprehensively consider multi-scale effects and accurately reflect the influence of the actual braided structure. Summary of the Invention
[0003] The purpose of this application is to provide a method and apparatus for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials to solve the problem that existing methods for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials cannot simulate microscale damage.
[0004] According to a first aspect of the embodiments of this application, a method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials is provided, including:
[0005] A volumetric element model was established at the microscale based on the carbon content of the fiber-woven composite material.
[0006] A spatial model is established at a macroscopic scale based on the braiding structure of the fiber-braided composite material;
[0007] Add material properties of matrix material and fiber bundles;
[0008] Periodic boundary conditions are added to the volume element model to obtain the fiber material parameters;
[0009] The material parameters are used as the material parameters of the fiber bundles in the spatial model;
[0010] A machining angle model between the cutting tool and the fiber filament is established at the microscale.
[0011] A cutting simulation model is established on a macroscopic scale based on the aforementioned spatial model;
[0012] Add the contact relationship between the cutting tool and the fiber composite material.
[0013] In some alternative embodiments of this application, the braided structure includes the cross-sectional shape of the fiber bundle, the braiding angle, and the braiding knot height.
[0014] In some optional embodiments of this application, a spatial model is established at a macroscopic scale based on the weave structure of the fiber-woven composite material, including:
[0015] Based on actual material measurements, the internal weave angle γ, unit cell width, and height W of the material are obtained. i Then, h is used to obtain the other geometric parameters of the unit cell according to the following equation:
[0016]
[0017] h = 8b / tanγ
[0018] Here, a and b are the major and minor axes of the ellipse inscribed in the octagonal cross-section of the fiber bundle, respectively; the calculation methods for the major and minor sides of the octagonal cross-section are as follows:
[0019] L1=2bcosγ
[0020]
[0021] A spatial model for characterizing three-dimensional braided composite materials at the macroscopic scale is constructed based on geometric parameters.
[0022] In some optional embodiments of this application, the material properties of the matrix material and the fiber bundle are added, including:
[0023] The matrix material is simulated for its pre-fracture behavior using isotropic elastoplastic constitutive models;
[0024] The fiber bundles are anisotropically constitutive to simulate their behavior before fracture.
[0025] In some optional embodiments of this application, periodic boundary conditions are added to the volume element model to obtain fiber material parameters, including:
[0026] Tension, compression, and in-plane and out-of-plane loads in three directions are applied to the volume element model, and the stress-strain curves of the model under various loads are extracted. The parameters of the fiber material are obtained based on the different load curves.
[0027] In some optional embodiments of this application, the fiber material parameters include the elastic modulus and tensile and compressive strength in various directions, as well as the in-plane and out-of-plane shear modulus and shear strength.
[0028] In some optional embodiments of this application, the method for calculating the fiber material parameters includes:
[0029]
[0030] It is the equivalent stiffness matrix, equivalent stress, and strain. σ and ε are the stress and strain of each element. The elastic modulus and shear modulus of the material in each direction are obtained based on the equivalent stiffness matrix.
[0031] In some optional embodiments of this application, the contact relationship includes the contact between the outer surface of the tool and the outer surface of the composite material, the contact between the outer surface of the tool and the internal mesh of the cutting area, and the contact between the outer surfaces of the internal mesh of the cutting area;
[0032] Among them, the tangential friction coefficient is defined between the outer surface of the tool and the outer surface of the composite material, and between the outer surface of the tool and the internal mesh of the cutting area;
[0033] A normal hard contact is defined between the outer surfaces of the mesh within the cutting region;
[0034] The algorithm for calculating the normal contact stress in the contact pair relationship follows the hard contact algorithm to calculate the contact stress.
[0035] According to a second aspect of the embodiments of this application, a multi-scale three-dimensional braided composite material cutting process simulation modeling device is provided, comprising:
[0036] The unit model building module is used to build volumetric unit models at the microscale according to the carbon content of fiber-woven composite materials.
[0037] The spatial model building module is used to build a spatial model based on the weaving structure of the fiber-woven composite material at a macroscopic scale.
[0038] The Material Properties module is used to add material properties for the matrix material and fiber bundles;
[0039] The first data processing module is used to add periodic boundary conditions to the volume element model to obtain fiber material parameters;
[0040] The second data processing module is used to use the material parameters as material parameters for the fiber bundles in the spatial model.
[0041] The angle model building module is used to build a machining angle model between the cutting tool and the fiber filament at a microscopic scale.
[0042] The simulation model building module is used to build a cutting simulation model on a macroscopic scale based on the spatial model.
[0043] The third data processing module is used to add the contact relationship between the cutting tool and the fiber composite material.
[0044] According to a third aspect of the embodiments of this application, an electronic device is provided, which may include:
[0045] processor;
[0046] Memory used to store processor-executable instructions;
[0047] The processor is configured to execute instructions to implement the multi-scale three-dimensional braided composite material cutting process simulation modeling method as described in any embodiment of the first aspect.
[0048] The above-mentioned technical solution of this application has the following beneficial technical effects:
[0049] This application provides a multi-scale three-dimensional braided composite material cutting process simulation modeling method. By using a unit model at the microscale and a spatial model at the macroscale, it can accurately describe the coupling relationship between the microscopic material removal mechanism and the macroscopic structural damage evolution. It clarifies the different material removal mechanisms under different fiber-tool angles, which can provide theoretical guidance for the optimization of precision machining parameters and significantly improve machining quality and material structural integrity. Attached Figure Description
[0050] Figure 1 This is a flowchart of a multi-scale three-dimensional braided composite material cutting process simulation modeling method according to an exemplary embodiment of this application;
[0051] Figure 2 This is a schematic diagram of a fiber-woven composite material volume unit according to an exemplary embodiment of this application;
[0052] Figure 3 This is a schematic diagram of a spatial model of a fiber-woven composite material according to an exemplary embodiment of this application;
[0053] Figure 4 This is a schematic diagram of a spatial model of a fiber-woven composite material in another exemplary embodiment of this application;
[0054] Figure 5 This is a microscale cutting simulation model of a fiber-braided composite material according to an exemplary embodiment of this application;
[0055] Figure 6 This is a macroscopic cutting simulation model of a fiber-braided composite material in an exemplary embodiment of this application;
[0056] Figure 7 This is a microscale cutting simulation process of a fiber braided composite material in an exemplary embodiment of this application;
[0057] Figure 8 This is a macroscopic cutting simulation process of a fiber braided composite material in an exemplary embodiment of this application;
[0058] Figure 9This is a schematic diagram of a multi-scale three-dimensional braided composite material cutting process simulation and modeling device in an exemplary embodiment of this application;
[0059] Figure 10 This is a schematic diagram of the electronic device structure in an exemplary embodiment of this application. Detailed Implementation
[0060] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this application. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this application.
[0061] The accompanying drawings illustrate layer structure diagrams according to embodiments of this application. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.
[0062] Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0063] In the description of this application, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0064] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0065] The following description, in conjunction with the accompanying drawings, details a multi-scale three-dimensional braided composite material cutting process simulation modeling method and apparatus provided in this application through specific embodiments and application scenarios.
[0066] like Figure 1 As shown in Embodiment 1 of this application, a method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials is provided, including the following steps:
[0067] Step S101: Establish a volumetric element model at the microscale based on the carbon content of the fiber-woven composite material;
[0068] Step S102: Establish a spatial model based on the braiding structure of the fiber-braided composite material at a macroscopic scale;
[0069] Step S103: Add the material properties of the matrix material and fiber bundles;
[0070] Step S104: Add periodic boundary conditions to the volume element model to obtain the fiber material parameters;
[0071] Step S105: Use the material parameters as the material parameters of the fiber bundles in the space model;
[0072] Step S106: Establish a machining angle model between the tool and the fiber at the microscale;
[0073] Step S107: Establish a cutting simulation model on a macroscopic scale based on the spatial model;
[0074] Step S108: Add the contact relationship between the cutting tool and the fiber composite material.
[0075] In this embodiment, a fiber-woven composite material can be a three-dimensional four-directional woven composite material or a three-dimensional five-directional woven composite material. This embodiment provides a multi-scale three-dimensional woven composite material cutting process simulation modeling method. Through the unit model at the microscale and the spatial model at the macroscale, it can accurately describe the coupling relationship between the microscopic material removal mechanism and the macroscopic structural damage evolution, clarify the different material removal mechanisms under different fiber-tool angles, provide theoretical guidance for precision machining parameter optimization, and significantly improve machining quality and material structural integrity.
[0076] Embodiment 2 of this application provides a method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials, including:
[0077] Representative volume elements at the microscale are established based on the carbon content in the woven fiber bundles, as shown in the attached figure. Figure 2 As shown, periodic boundary conditions in six directions are applied to a representative volume element. The opposing and parallel planes are paired. For the representative volume element, the periodic boundary conditions must be strain-compatible and stress-continuous, expressed as:
[0078]
[0079] In the above equation, ε ik x represents the average strain of a volumetric unit. k To represent the coordinates of any point within a volume element, This is the correction amount for the displacement in the periodic boundary, where The value cannot be precisely defined. Assuming that in a volume element, there are two faces opposite and parallel in a certain direction, the boundary condition expression for the face opposite the positive coordinate axis is:
[0080]
[0081] The boundary condition expression for the plane relative to the negative direction is:
[0082]
[0083] From the above two equations, we can obtain
[0084]
[0085] Based on the above equation, periodic boundary conditions for opposite faces in a representative volume element are established.
[0086] Material properties of the matrix material and fiber bundles are established, wherein the matrix material is simulated by isotropic elastoplastic constitutive model to simulate its behavior before fracture, and the fiber bundles are simulated by anisotropic constitutive model to simulate their behavior before fracture.
[0087] Tensile and compressive loads in three directions, as well as in-plane and out-of-plane shear loads, are applied to a representative volume element with periodic boundary conditions. After obtaining the material response, a standard volume-weighted local homogenization method is implemented using Python code. The calculation method is as follows:
[0088]
[0089] It is the equivalent stiffness matrix, equivalent stress, and strain. σ and ε are the stress and strain of each element. The elastic modulus and shear modulus of the material in each direction are obtained from the equivalent stiffness matrix obtained from the above formula. The resulting material properties are equivalent to the material properties of fiber bundles in macroscopic simulation.
[0090] On a macroscopic scale, based on the weaving characteristics of the fiber bundles, the cross-sectional shape of the fiber bundles, the spacing between the bundles, and the weaving method, the trajectory equations of the fiber bundle sweep are calculated. Simultaneously, based on the fiber volume fraction and fiber size, the corresponding dimensional parameters of the composite matrix cuboid model are calculated, as shown in the appendix. Figure 3 As shown.
[0091] To analyze the machining angle between the cutting tool and the fiber bundle during the processing of three-dimensional braided composite materials at the macroscopic scale, and to establish a corresponding microscopic cutting simulation model based on the carbon content in the fiber bundle, a cutting simulation model was established.
[0092] Assemble the cutting simulation models at both micro and macro scales, as shown in the attached figure. Figure 5-6As shown, the tool tip is in just-contact with the surface of the composite material. On a macro scale, the cutting depth of the tool tip should be set according to the cutting amount per revolution in the machining parameters, and on a micro scale, the cutting depth is taken as 10μm.
[0093] Mesh generation was performed on the cutting simulation model at both micro and macro scales. To ensure mesh quality, a mapping mesh generation script written in Python was used to generate meshes for the fiber and the matrix, resulting in uniform meshes in the model and improving mesh generation quality.
[0094] To establish contact relationships, during the cutting process, due to mesh deletion and the detachment of some meshes from the mesoscopic model matrix, it is necessary to define the relationships between the tool outer surface and the composite material outer surface, between the tool outer surface and the mesh inside the cutting area, and between the mesh outer surfaces inside the cutting area. The contact between the mesh surfaces inside the cutting area is considered to be due to the possibility of contact after the mesh detaches from the composite material matrix.
[0095] In this embodiment, the contact relationships are strictly defined as three different contact relationships. These three contact relationships involve the contact between the outer surface of the tool and the surface of the composite material model, the outer surface of the tool and the outer surface of the internal unit of the cutting area, and the contact between the inner unit of the cutting area. Among them, the tangential friction coefficient needs to be defined between the outer surface of the tool and the surface of the composite material mesoscopic model, and between the outer surface of the tool and the outer surface of the mesh unit in the drilling area of the composite material mesoscopic model. The tangential friction coefficient does not need to be defined for the contact between units in the cutting area, only normal phase hard contact is defined.
[0096] Example 1 simulates the cutting process of a three-dimensional four-way braided composite material. The ideal cross-section of the fiber bundle is assumed to be an inscribed elliptical octagon with a long side L1 of 0.3 mm and a short side L2 of 0.1 mm. The internal braiding angle of the material is 39°. The macroscopic unit cell dimensions L1, L2, and L3 are... i W i The thicknesses and diameters of the fibers are 2.21 mm, 2.21 mm, and 3.83 mm, respectively. The carbon content in the fiber bundle is 80%, and the diameter of the fiber filament is 7.5 μm.
[0097] For the tool model, the rake angle and clearance angle are set according to the actual tool used. In Example 1, the rake angle of the tool is 20° and the clearance angle is 10°.
[0098] After the fiber and matrix models are established, the matrix and fiber models are assembled in the corresponding positions in the finite element analysis software in the software assembly module. The matrix and fiber models are merged and the internal boundaries are preserved to obtain the composite material model used for analysis.
[0099] Import the 3D model of the tool into the finite element analysis software and set the rigid body motion reference point.
[0100] The cutting tool and the composite material model are assembled in the assembly module so that the tip of the cutting tool is in contact with the surface of the composite material.
[0101] Mesh the composite material model and the cutting tool. Since the cutting tool is a rigid body, its mesh properties cannot be changed. For the composite material model, use the fully integrated 3D solid mesh element type.
[0102] In the material properties section, material properties are assigned to the composite material model. The composite matrix is simulated for fracture mechanics using an isotropic constitutive relation, and the fibers are simulated for fracture behavior using Hashin failure. Material orientations are defined for the composite fibers. In this example, the matrix material is epoxy resin, a common resin-based material for composite materials.
[0103] Establish a dynamic analysis step, define the analysis time length, define the output of field variables and historical variables, and define the output of the force and displacement historical variables of the tool motion reference point.
[0104] Define the contact between the outer surface of the tool and the outer surface of the composite material, the outer surface of the tool and the outer surface of the inner unit of the composite material cutting area, and the outer surface of the inner unit of the cutting area. Except for the outer surface of the inner unit of the cutting area, the sliding friction coefficient of the other two pairs of contacts is set to 0.35.
[0105] Define boundary conditions and calculate the cutting edge linear velocity based on the actual tool rotation speed and tool diameter, and assign it to the tool linear velocity in the simulation model.
[0106] like Figure 9 As shown, based on the same inventive concept, the third embodiment of this application provides a multi-scale three-dimensional braided composite material cutting process simulation modeling device, including:
[0107] Unit model building module 11 is used to build a volumetric unit model at the microscale according to the carbon content of the fiber-woven composite material.
[0108] Spatial model building module 12 is used to build a spatial model based on the weaving structure of fiber-woven composite materials at a macroscopic scale;
[0109] Material Properties Module 13 is used to add material properties of the matrix material and fiber bundles;
[0110] The first data processing module 14 is used to add periodic boundary conditions to the volume element model to obtain fiber material parameters;
[0111] The second data processing module 15 is used to use material parameters as material parameters for fiber bundles in the spatial model.
[0112] The included angle model building module 16 is used to build a machining included angle model between the cutting tool and the fiber filament at a microscale.
[0113] Simulation model building module 17 is used to build a cutting simulation model on a macroscopic scale based on a spatial model;
[0114] The third data processing module 18 is used to add the contact relationship between the cutting tool and the fiber composite material.
[0115] Optionally, such as Figure 10 As shown, this application embodiment also provides an electronic device 1100, including a processor 1101, a memory 1102, and a program or instructions stored in the memory 1102 and executable on the processor 1101. When the program or instructions are executed by the processor 1101, they implement the various processes of the above-described multi-scale three-dimensional braided composite material cutting process simulation modeling method embodiment and achieve the same technical effect. To avoid repetition, they will not be described again here.
[0116] It should be noted that the electronic devices in the embodiments of this application include the mobile electronic devices and non-mobile electronic devices described above.
[0117] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described multi-scale three-dimensional braided composite material cutting process simulation modeling method embodiment and achieve the same technical effect. To avoid repetition, they will not be described again here.
[0118] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.
[0119] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described multi-scale three-dimensional braided composite material cutting process simulation modeling method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.
[0120] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.
[0121] It should be noted that, in this embodiment, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
[0122] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.
[0123] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.
Claims
1. A method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials, characterized in that, include: A volumetric element model was established at the microscale based on the carbon content of the fiber-woven composite material. A spatial model is established at a macroscopic scale based on the braiding structure of the fiber-braided composite material; Add material properties of matrix material and fiber bundles; Periodic boundary conditions are added to the volume element model to obtain the fiber material parameters; The material parameters are used as the material parameters of the fiber bundles in the spatial model; A machining angle model between the cutting tool and the fiber filament is established at the microscale. A cutting simulation model is established on a macroscopic scale based on the aforementioned spatial model; Add the contact relationship between the cutting tool and the fiber-woven composite material; The step of establishing a spatial model based on the weaving structure of the fiber-woven composite material at a macroscopic scale includes: The internal weave angle of the material is obtained based on actual material measurements. First, determine the unit cell width and height W and h, then obtain the other geometric parameters of the unit cell according to the following equation: Here, a and b are the major and minor axes of the ellipse inscribed in the octagonal cross-section of the fiber bundle, respectively; the calculation methods for the major and minor sides of the octagonal cross-section are as follows: A spatial model for characterizing three-dimensional braided composite materials at the macroscopic scale is constructed based on geometric parameters. The calculation methods for the fiber material parameters include: , , It refers to the equivalent stiffness matrix, equivalent stress, and strain. , These are the stress and strain of each unit. Based on the equivalent stiffness matrix, the elastic modulus and shear modulus of the material in each direction are obtained.
2. The method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials according to claim 1, characterized in that, The braided structure includes the cross-sectional shape of the fiber bundle, the braiding angle, and the braiding section height.
3. The method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials according to claim 1, characterized in that, Add material properties to the matrix material and fiber bundles, including: The matrix material is simulated for its pre-fracture behavior using isotropic elastoplastic constitutive models; The fiber bundles are anisotropically constitutive to simulate their behavior before fracture.
4. The method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials according to claim 1, characterized in that, Adding periodic boundary conditions to the volume element model yields the fiber material parameters, including: Tension, compression, and in-plane and out-of-plane loads in three directions are applied to the volume element model, and the stress-strain curves of the model under various loads are extracted. The parameters of the fiber material are obtained based on the different load curves.
5. The method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials according to claim 4, characterized in that, The fiber material parameters include the elastic modulus and tensile and compressive strength in various directions, as well as the in-plane and out-of-plane shear modulus and shear strength.
6. The method for simulating and modeling the cutting process of multi-scale three-dimensional braided composite materials according to claim 1, characterized in that, The contact relationships include those between the outer surface of the tool and the outer surface of the fiber-woven composite material, between the outer surface of the tool and the internal mesh of the cutting area, and between the outer surfaces of the internal mesh of the cutting area. Among them, the tangential friction coefficients are defined between the outer surface of the tool and the outer surface of the fiber braided composite material, and between the outer surface of the tool and the internal mesh of the cutting area. A normal hard contact is defined between the outer surfaces of the mesh within the cutting region; The algorithm for calculating the normal contact stress in the contact relationship follows the hard contact algorithm to calculate the contact stress.
7. A multi-scale three-dimensional braided composite material cutting process simulation modeling device, characterized in that, include: The unit model building module is used to build volumetric unit models at the microscale according to the carbon content of fiber-woven composite materials. The spatial model building module is used to build a spatial model of the fiber-woven composite material at a macroscopic scale based on the weave structure. Specifically, it obtains the internal weave angle of the material based on actual material measurements. First, determine the unit cell width and height W and h, then obtain the other geometric parameters of the unit cell according to the following equation: Here, a and b are the major and minor axes of the ellipse inscribed in the octagonal cross-section of the fiber bundle, respectively; the calculation methods for the major and minor sides of the octagonal cross-section are as follows: A spatial model for characterizing three-dimensional braided composite materials at the macroscopic scale is constructed based on geometric parameters. The Material Properties module is used to add material properties for the matrix material and fiber bundles; The first data processing module is used to add periodic boundary conditions to the volume element model to obtain fiber material parameters. The calculation method for the fiber material parameters includes: , , It refers to the equivalent stiffness matrix, equivalent stress, and strain. , These are the stress and strain of each unit. Based on the equivalent stiffness matrix, the elastic modulus and shear modulus of the material in each direction are obtained. The second data processing module is used to use the material parameters as material parameters for the fiber bundles in the spatial model. The angle model building module is used to build a machining angle model between the cutting tool and the fiber filament at a microscopic scale. The simulation model building module is used to build a cutting simulation model on a macroscopic scale based on the spatial model. The third data processing module is used to add the contact relationship between the cutting tool and the fiber-woven composite material.
8. An electronic device, characterized in that, include: A processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement a multi-scale three-dimensional braided composite material cutting process simulation modeling method as described in any one of claims 1-6.