Simulation modeling method for cutting process of multi-scale three-dimensional woven composite material

Abstract

The invention discloses a multi-scale three-dimensional braided composite material cutting process simulation modeling method and device, and belongs to the technical field of braided material processing, and the method comprises the steps: building a volume element model at a micro scale according to the carbon content of a fiber braided composite material; establishing a space model according to the woven structure of the fiber woven composite material in a macroscopic scale; adding material properties of a base material and fiber tows; adding a periodic boundary condition to the volume element model to obtain a fiber material parameter; taking the material parameters as material parameters of fiber bundles in the space model; establishing a machining included angle model of the cutter and the cellosilk under the micro-scale; establishing a cutting simulation model under a macroscopic scale based on the spatial model; and adding the contact relation between the cutter and the fiber composite material. According to the method, the coupling relation between a microcosmic material removal mechanism and macrostructure damage evolution can be accurately described through the unit model under the microscale and the space model under the macroscale, and theoretical guidance is provided for precision machining parameter optimization.

Description

Technical Field

[0001] The present application belongs to the technical field of braided material processing, and specifically relates to a multi-scale three-dimensional braided composite material cutting process simulation modeling method and device. Background Art

[0002] Three-dimensional fiber braided composites have excellent mechanical properties due to their complex spatial structure and are widely used in aerospace, rail transportation, and defense. However, the material is prone to internal damage during low-speed cutting, such as fiber breakage, resin cracking, and interface debonding, which seriously affect the mechanical properties and structural integrity of the material. Current research methods on the cutting of three-dimensional fiber braided composites mostly focus on a single scale and cannot accurately describe the microscale material removal mechanism and the macroscale structural damage evolution process at the same time. Therefore, there is an urgent need for a cutting simulation modeling method that can comprehensively consider multi-scale effects and accurately reflect the influence of the real braided structure. Summary of the Invention

[0003] The purpose of this application is to provide a multi-scale three-dimensional braided composite material cutting process simulation modeling method and device to solve the problem that the existing multi-scale three-dimensional braided composite material cutting process simulation modeling method cannot simulate micro-scale damage.

[0004] According to a first aspect of an embodiment of the present application, a multi-scale three-dimensional braided composite material cutting process simulation modeling method is provided, comprising:

[0005] At the microscale, a volume unit model is established according to the carbon content of the fiber woven composite material;

[0006] establishing a spatial model based on the braided structure of the fiber braided composite material at a macro scale;

[0007] Add material properties of matrix material and fiber tow;

[0008] Adding periodic boundary conditions to the volume unit model to obtain fiber material parameters;

[0009] using the material parameters as material parameters of the fiber bundle in the spatial model;

[0010] Establish a processing angle model between the tool and the fiber at the micro scale;

[0011] establishing a cutting simulation model at a macro scale based on the spatial model;

[0012] Adding the contact relationship between the tool and the fiber composite material.

[0013] In some optional embodiments of the present application, the braided structure includes a cross-sectional shape of the fiber bundle, a braiding angle, and a braiding section height.

[0014] In some optional embodiments of the present application, establishing a spatial model based on the woven structure of the fiber woven composite material at a macro scale includes:

[0015] According to the actual material measurement, the internal braiding angle γ, unit cell width and height W of the material are obtained i , h, and then other geometric parameters of the unit cell are obtained according to the following equations:

[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 long and short sides of the octagonal cross section are calculated as follows:

[0019] L1=2bcosγ

[0020]

[0021] A spatial model is constructed based on geometric parameters to characterize three-dimensional woven composite materials at the macro scale.

[0022] In some optional embodiments of the present application, the material properties of the matrix material and the fiber tow are added, including:

[0023] The matrix material's behavior before fracture is simulated using an isotropic elastic-plastic constitutive model;

[0024] The behavior of fiber bundles before fracture is simulated using anisotropic constitutive models.

[0025] In some optional embodiments of the present application, adding periodic boundary conditions to the volume unit model to obtain fiber material parameters includes:

[0026] Tensile and compressive loads in three directions as well as in-plane and out-of-plane loads are applied to the volume unit model, stress-strain curves of the model under various loads are extracted, and the fiber material parameters are obtained according to different load curves.

[0027] In some optional embodiments of the present application, the fiber material parameters include the elastic modulus and tensile and compressive strength in all directions of the material, in-plane and out-of-plane shear modulus, and shear strength.

[0028] In some optional embodiments of the present application, the method for calculating the fiber material parameters includes:

[0029]

[0030] is the equivalent stiffness matrix, equivalent stress, and strain, σ and ε are the stress and strain of each unit, and the elastic modulus and shear modulus of the material in each direction are obtained according to the equivalent stiffness matrix.

[0031] In some optional embodiments of the present application, the contact relationship includes between the outer surface of the tool and the outer surface of the composite material, between the outer surface of the tool and the internal grid of the cutting area, and between the outer surface of the internal grid 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 inner mesh of the cutting area;

[0033] Normal hard contact is defined between the outer surfaces of the mesh inside the cutting area;

[0034] The normal contact stress algorithm in the contact pair relationship follows the hard contact algorithm calculation method to calculate the contact stress.

[0035] According to a second aspect of an embodiment of the present application, a multi-scale three-dimensional braided composite material cutting process simulation modeling device is provided, comprising:

[0036] A unit model building module is used to build a volume unit model based on the carbon content of fiber-woven composite materials at a microscopic scale;

[0037] A spatial model building module, for building a spatial model based on the braided structure of the fiber braided composite material at a macro scale;

[0038] Material properties module, used to add material properties of matrix materials and fiber tows;

[0039] A first data processing module is used to add periodic boundary conditions to the volume unit model to obtain fiber material parameters;

[0040] a second data processing module, configured to use the material parameters as material parameters of the fiber bundle in the spatial model;

[0041] Angle model building module, used to build the processing angle model between the tool and the fiber at a micro scale;

[0042] A simulation model building module, used to build a cutting simulation model at a macro scale based on the spatial model;

[0043] The third data processing module is used to add the contact relationship between the tool and the fiber composite material.

[0044] According to a third aspect of an embodiment of the present application, an electronic device is provided, which may include:

[0045] processor;

[0046] a memory for storing 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 one of the embodiments of the first aspect.

[0048] The above technical solution of this application has the following beneficial technical effects:

[0049] An embodiment of the present application provides a multi-scale three-dimensional woven composite material cutting process simulation modeling method. Through the unit model at the micro scale and the spatial model at the macro scale, it can accurately describe the coupling relationship between the micro material removal mechanism and the macro structural damage evolution, clarify the different mechanisms of material removal under different fiber and tool angles, and can provide theoretical guidance for the optimization of precision machining parameters, significantly improving the machining quality and material structure integrity. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a flow chart of a multi-scale three-dimensional braided composite material cutting process simulation modeling method in an exemplary embodiment of the present application;

[0051] Figure 2 is a schematic diagram of a volume unit of a fiber woven composite material in an exemplary embodiment of the present application;

[0052] Figure 3 This is a schematic diagram of a spatial model of a fiber woven composite material in an exemplary embodiment of the present application;

[0053] Figure 4 is a schematic diagram of a spatial model of a fiber woven composite material in another exemplary embodiment of the present application;

[0054] Figure 5 It is a micro-scale cutting simulation model of a fiber braided composite material in an exemplary embodiment of the present application;

[0055] Figure 6 It is a macro-scale cutting simulation model of a fiber braided composite material in an exemplary embodiment of the present application;

[0056] Figure 7 This is a micro-scale cutting simulation process of a fiber braided composite material in an exemplary embodiment of the present application;

[0057] Figure 8 This is a macro-scale cutting simulation process of a fiber braided composite material in an exemplary embodiment of the present application;

[0058] Figure 9is a schematic diagram of a multi-scale three-dimensional braided composite material cutting process simulation modeling device in an exemplary embodiment of the present application;

[0059] Figure 10 This is a schematic diagram of the structure of an electronic device in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0060] To make the objectives, technical solutions, and advantages of this application more clearly understood, this application is further described below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely illustrative and are not intended to limit the scope of this application. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion in the concepts of this application.

[0061] The accompanying drawings illustrate schematic diagrams of layer structures according to embodiments of the present application. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0062] Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts 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 understood as indicating or implying relative importance.

[0064] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0065] In the following, in conjunction with the accompanying drawings, a multi-scale three-dimensional braided composite material cutting process simulation modeling method and device provided by the embodiment of the present application are described in detail through specific embodiments and application scenarios.

[0066] like Figure 1 As shown, in the first embodiment of the present application, a multi-scale three-dimensional braided composite material cutting process simulation modeling method is provided, comprising the following steps:

[0067] Step S101: establishing a volume unit model according to the carbon content of the fiber braided composite material at a microscopic scale;

[0068] Step S102: establishing a spatial model based on the braided structure of the fiber braided composite material at a macro scale;

[0069] Step S103: adding material properties of the matrix material and the fiber tow;

[0070] Step S104: adding periodic boundary conditions to the volume unit model to obtain fiber material parameters;

[0071] Step S105: using the material parameters as the material parameters of the fiber bundle in the space model;

[0072] Step S106: establishing a processing angle model between the tool and the fiber at a microscopic scale;

[0073] Step S107: establishing a cutting simulation model at a macro scale based on the spatial model;

[0074] Step S108: adding a contact relationship between the tool and the fiber composite material.

[0075] In this embodiment, a fiber braided composite material can be a three-dimensional four-directional braided composite material or a three-dimensional five-directional braided composite material. This embodiment provides a multi-scale three-dimensional braided composite material cutting process simulation modeling method. Through a micro-scale unit model and a macro-scale spatial model, 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, provides theoretical guidance for the optimization of precision machining parameters, and significantly improves machining quality and material structural integrity.

[0076] In a second embodiment of the present application, a multi-scale three-dimensional braided composite material cutting process simulation modeling method is provided, comprising:

[0077] According to the carbon content in the woven fiber bundle, a representative volume element at the micro scale is established, as shown in the attached Figure 2 As shown, periodic boundary conditions in six directions are applied to the representative volume element. The opposite and parallel planes are paired. For the representative volume element, the periodic boundary conditions require strain coordination and stress continuity. The expression is:

[0078]

[0079] In the above equation, ε ik is the average strain of the representative volume unit, x k is the coordinate value of any point in the volume unit, is the correction for the displacement in the periodic boundary, where The value cannot be precisely defined. Assuming that there are two parallel and opposite faces in a certain direction of the representative volume element, the boundary condition expression relative to the face in the positive direction of the coordinate axis is:

[0080]

[0081] The boundary condition expression on the surface in the negative direction is:

[0082]

[0083] From the above two formulas, we can get

[0084]

[0085] Periodic boundary conditions on opposite surfaces of a representative volume element are established based on the above equation.

[0086] The material properties of the matrix material and the fiber tow are established. The matrix material is simulated with an isotropic elastic-plastic constitutive model before fracture, while the fiber tow is simulated with an anisotropic constitutive model 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, the standard volume-weighted local homogenization method is implemented using Python code. The calculation method is as follows:

[0088]

[0089] is the equivalent stiffness matrix, equivalent stress, and strain, σ and ε are the stress and strain of each unit. The elastic modulus and shear modulus of the material in all directions are obtained according to the equivalent stiffness matrix obtained by the above formula; the obtained material properties are equivalent to the material properties of the fiber bundle in the macro-scale simulation.

[0090] At the macro scale, the trajectory equation of the fiber tow sweep is calculated according to the weaving characteristics of the fiber tow, the cross-sectional shape of the fiber tow, the tow gap, and the weaving method. At the same time, the corresponding size parameters of the composite matrix rectangular parallelepiped model are calculated based on the fiber volume fraction and fiber size, as shown in the attached figure. Figure 3 shown.

[0091] The processing angle between the tool and the fiber bundle during the processing of three-dimensional braided composite materials at the macro scale and the carbon content in the fiber bundle are analyzed to establish a corresponding cutting simulation model at the micro scale.

[0092] Assemble the cutting simulation models at micro and macro scales, as shown in the attached Figure 5-6As shown, the tool tip is in contact with the composite surface. At the macro scale, the cutting depth of the tool tip should be set according to the cutting amount per revolution in the processing parameters, and the cutting depth at the micro scale is 10 μm.

[0093] The cutting simulation models at the micro and macro scales are meshed. To ensure the mesh quality, the fiber and matrix are meshed using a mapped meshing script written in Python, making the mesh in the model uniform and improving the mesh quality.

[0094] Establish contact relationship. During the cutting process, due to the deletion of meshes and the separation of some meshes from the mesoscopic model matrix, it is necessary to define the relationship between the outer surface of the tool and the outer surface of the composite material, the outer surface of the tool and the internal mesh of the cutting area, and the outer surface of the internal mesh of the cutting area. The contact between the mesh surface inside the cutting area is considered because contact may occur after the mesh is separated from the composite material matrix.

[0095] The contact relationships defined in this embodiment are strictly stipulated as three different contact relationships. The objects involved in these three contact relationships are 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 unit inside the cutting area, and the contact between the unit surfaces inside 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 the outer surface of the tool and the outer surface of the grid unit in the drilling area of ​​the composite material mesoscopic model. The contact between the units in the cutting area does not need to define the tangential friction coefficient, and only the normal phase hard contact is defined.

[0096] Example 1 is a simulation of the cutting process of a three-dimensional four-directional braided composite material. The cross section of the fiber bundle is ideally assumed to be an inscribed elliptical octagonal cross section. The long side L1 of the octagon is 0.3 mm, the short side L2 is 0.1 mm, the internal braiding angle of the material is 39°, and the length, width and height of the macro-scale unit cell are L i 、W i , h are 2.21mm, 2.21mm, and 3.83mm respectively, the carbon content in the fiber bundle is 80%, and the diameter of the fiber filament is 7.5μm.

[0097] For the tool model, the rake angle and clearance angle of the tool actually used are set. 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 model finite element analysis software is used. The matrix model and the fiber model are assembled to the corresponding positions in the software assembly module, and the matrix model and the fiber model are merged and the internal boundaries are retained to obtain the composite material model used for analysis.

[0099] Import the three-dimensional model of the tool into the finite element analysis software and set the rigid body motion reference point.

[0100] The tool and the composite material model are assembled in the assembly module so that the tip of the tool just contacts the surface of the composite material.

[0101] The composite material model and the tool are meshed. Since the tool is a rigid body, its mesh properties cannot be changed. For the composite material model, a fully integrated three-dimensional solid mesh element type is used.

[0102] In the Material Properties section, assign material properties to the composite material model. Use an isotropic constitutive relationship to simulate the fracture mechanics behavior of the composite matrix, use hashin failure to simulate the fracture behavior of the fibers, and define material orientation for the composite fibers. In this example, the matrix material is epoxy resin, a common resin-based material for composite materials.

[0103] Establish a display dynamics analysis step, define the analysis time length, define the field variables and history variable outputs, and define the output of the tool motion reference point force and displacement history variables.

[0104] Define the contacts 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 unit inside the composite material cutting area, and the outer surface of the unit inside the cutting area. Except that the tangential sliding friction coefficient is not defined between the outer surfaces of the units inside the cutting area, the sliding friction coefficient of the other two pairs of contacts is set to 0.35.

[0105] Define boundary conditions, calculate the linear velocity of the cutting edge based on the tool rotation speed and tool diameter in actual machining, and assign it to the tool linear velocity in the simulation model.

[0106] like Figure 9 As shown, based on the same inventive concept, a third embodiment of the present application provides a multi-scale three-dimensional braided composite material cutting process simulation modeling device, comprising:

[0107] The unit model establishment module 11 is used to establish a volume unit model according to the carbon content of the fiber woven composite material at a micro scale;

[0108] A spatial model building module 12 is used to build a spatial model based on the braided structure of the fiber braided composite material at a macro scale;

[0109] Material property module 13, used to add material properties of matrix material and fiber tow;

[0110] A first data processing module 14 is used to add periodic boundary conditions to the volume unit model to obtain fiber material parameters;

[0111] A second data processing module 15 is used to use the material parameters as material parameters of the fiber bundle in the spatial model;

[0112] An angle model building module 16 is used to build a processing angle model between the tool and the fiber at a microscopic scale;

[0113] A simulation model building module 17 is used to build a cutting simulation model at a macro scale based on the spatial model;

[0114] The third data processing module 18 is used to add the contact relationship between the tool and the fiber composite material.

[0115] Alternatively, as Figure 10 As shown, an embodiment of the present application also provides an electronic device 1100, including a processor 1101, a memory 1102, and a program or instruction stored in the memory 1102 and executable on the processor 1101. When the program or instruction is executed by the processor 1101, each process of the above-mentioned multi-scale three-dimensional woven composite material cutting process simulation modeling method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0116] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0117] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned multi-scale three-dimensional woven composite material cutting process simulation modeling method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0118] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), random access memory (RAM), a magnetic disk, or an optical disk.

[0119] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned multi-scale three-dimensional woven composite material cutting process simulation modeling method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0120] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0121] It should be noted that, in the present embodiment, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0122] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course 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 the present application is essentially or the part that contributes to the prior art can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0123] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A multi-scale three-dimensional braided composite material cutting process simulation modeling method, characterized in that: include: At the microscale, a volume unit model is established according to the carbon content of the fiber woven composite material; establishing a spatial model based on the braided structure of the fiber braided composite material at a macro scale; Add material properties of matrix material and fiber tow; Adding periodic boundary conditions to the volume unit model to obtain fiber material parameters; using the material parameters as material parameters of the fiber bundle in the spatial model; Establish a processing angle model between the tool and the fiber at the micro scale; establishing a cutting simulation model at a macro scale based on the spatial model; Adding the contact relationship between the tool and the fiber composite material.

2. The multi-scale three-dimensional braided composite material cutting process simulation modeling method according to claim 1 is characterized in that: The braiding structure includes the cross-sectional shape of the fiber bundle, the braiding angle, and the braiding section height.

3. The multi-scale three-dimensional braided composite material cutting process simulation modeling method according to claim 1, characterized in that: Establishing a spatial model based on the braided structure of the fiber braided composite material at a macro scale, including: According to the actual material measurement, the internal braiding angle γ, unit cell width and height W of the material are obtained i , h, and then other geometric parameters of the unit cell are obtained according to the following equations: h=8b / tanγ 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 long and short sides of the octagonal cross section are calculated as follows: L1=2bcosγ A spatial model is constructed based on geometric parameters to characterize three-dimensional woven composite materials at the macro scale.

4. The multi-scale three-dimensional braided composite material cutting process simulation modeling method according to claim 1, characterized in that: Add material properties for matrix and fiber tows, including: The matrix material's behavior before fracture is simulated using an isotropic elastic-plastic constitutive model; The behavior of fiber bundles before fracture is simulated using anisotropic constitutive models.

5. The multi-scale three-dimensional braided composite material cutting process simulation modeling method according to claim 1, characterized in that: Adding periodic boundary conditions to the volume unit model to obtain fiber material parameters includes: Tensile load, compression load, in-plane load and out-of-plane load are applied to the volume unit model in three directions, stress-strain curves of the model under various loads are extracted, and the fiber material parameters are obtained according to different load curves.

6. The multi-scale three-dimensional braided composite material cutting process simulation modeling method according to claim 5, characterized in that: The fiber material parameters include elastic modulus in all directions of the material as well as tensile and compressive strength, in-plane and out-of-plane shear modulus, and shear strength.

7. The multi-scale three-dimensional braided composite material cutting process simulation modeling method according to claim 1, characterized in that: The calculation method of the fiber material parameters includes: is the equivalent stiffness matrix, equivalent stress, and strain, σ and ε are the stress and strain of each unit, and the elastic modulus and shear modulus of the material in each direction are obtained according to the equivalent stiffness matrix.

8. The multi-scale three-dimensional braided composite material cutting process simulation modeling method according to claim 1, characterized in that: The contact relationship includes between the outer surface of the tool and the outer surface of the composite material, between the outer surface of the tool and the internal grid of the cutting area, and between the outer surface of the internal grid of the cutting area; 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 inner mesh of the cutting area; Normal hard contact is defined between the outer surfaces of the mesh inside the cutting area; The normal contact stress algorithm in the contact pair relationship follows the hard contact algorithm calculation method to calculate the contact stress.

9. A multi-scale three-dimensional braided composite material cutting process simulation modeling device, characterized in that: include: A unit model building module is used to build a volume unit model based on the carbon content of fiber-woven composite materials at a microscopic scale; A spatial model building module, for building a spatial model based on the braided structure of the fiber braided composite material at a macro scale; Material properties module, used to add material properties of matrix materials and fiber tows; A first data processing module is used to add periodic boundary conditions to the volume unit model to obtain fiber material parameters; a second data processing module, configured to use the material parameters as material parameters of the fiber bundle in the spatial model; Angle model building module, used to build the processing angle model between the tool and the fiber at a micro scale; A simulation model building module, used to build a cutting simulation model at a macro scale based on the spatial model; The third data processing module is used to add the contact relationship between the tool and the fiber composite material.

10. An electronic device, characterized in that: include: A processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements a multi-scale three-dimensional woven composite material cutting process simulation modeling method as described in any one of claims 1 to 8.

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