A simulation analysis method for mixed connection strength of a machine case rubber screw based on circumferential connection

Abstract

The application belongs to the technical field of material structure strength analysis, and relates to a kind of nacelle glue screw mixed connection strength simulation analysis method based on circumferential connection, the three-dimensional model of nacelle is established according to the lightweight design of nacelle, and mesh division is carried out;The basic mechanical properties of the material are obtained by test, the material properties are established under global definition, and the corresponding parts are respectively given in the solid mechanics physical field;According to the actual connection mode of each part of nacelle, the contact pair is set by penalty function, and the contact pair includes adhesive contact pair and bolt contact pair;In the solid mechanics physical field, load and fixed constraint state are set according to the actual working condition of nacelle;Calculation and solution are carried out by steady-state solver, and stress, strain and deformation distribution nephogram generated on nacelle after bearing are obtained in calculation result;The strain error of the strain generated at the measurement position obtained by the method and the strain pasted at the same position in the test is within 15%.

Description

Technical Field

[0001] This invention belongs to the field of composite material structural strength analysis technology, specifically relating to a simulation analysis method for the strength of a casing rubber-screw hybrid connection based on circumferential connection. Background Technology

[0002] As a crucial component of the helicopter transmission system, the transmission casing significantly impacts flight comfort and performance. Reducing the casing's weight effectively improves the helicopter's range and payload capacity. Currently, lightweight design is primarily achieved by replacing traditional metal materials with composite materials. However, the demolding deformation of composite materials makes dimensional accuracy difficult to control. This necessitates an engineering design scheme that uses metal materials in assembly areas to ensure tolerance accuracy, while using composite materials in non-assembly areas to achieve weight reduction. This design introduces the challenge of connecting composite and metal materials. Compared to a unibody structure, the connecting areas are prone to becoming weak points in the overall structure under load, manifesting as adhesive delamination, material failure due to stress concentration at bolt hole edges, and fastener failure. These phenomena can lead to casing failure, rendering it unable to bear loads. Verifying casing strength using traditional testing methods is time-consuming and costly. Therefore, finite element method (FEM) simulation analysis of casing structural strength is crucial for shortening the development cycle, identifying structural weaknesses, and verifying structural strength.

[0003] Currently, most studies on simulation analysis technology for hybrid connections of metal materials and composite materials focus only on the strength analysis of single or double lap joints between metal plates and composite laminates. The connected objects are all flat plate structures, and the loads are mostly unidirectional planar loads such as tension and compression. The connected objects and load forms are relatively limited. There are relatively few studies on connecting objects with rotating structures and other complex irregular structural features, and there are also relatively few studies and analyses on load conditions including three-dimensional spatial loads. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a simulation analysis method for the strength of a casing with a hybrid rubber-screw connection based on circumferential joints. The main problems addressed are: 1) Traditional testing methods for casing strength performance require waiting until the casing is manufactured. Furthermore, if design flaws lead to insufficient casing strength, the design must be adjusted, the casing remanufactured, and the tests repeated. The casing manufacturing process is lengthy and costly, making traditional strength verification methods overly cumbersome; 2) After strength testing using traditional methods, the casing may still retain its load-bearing capacity without any visible defects. Damage may occur, but the material itself and the adhesive layer that is difficult to observe may have already been damaged. At the same time, the test method cannot obtain the stress, strain and deformation distribution generated after the casing is loaded, and cannot provide a reference for further optimization and targeted strengthening of the structural design; 3) The simulation analysis object of the traditional composite material and metal material glue and screw hybrid connection is generally a single or double lap plate structure subjected to uniaxial load conditions. The structural geometry and load-bearing form of this connection method are relatively simple. When the analysis object contains a relatively complex structure and the load-bearing form is also relatively complex, and the connection is made in the circumferential direction, the traditional analysis method is no longer applicable.

[0005] In order to achieve the objectives of this invention, we will implement it using the technical solutions described below.

[0006] A simulation analysis method for the strength of a casing rubber-screw hybrid connection based on circumferential connection includes the following steps:

[0007] S1. Following the principle of using metal materials for assembly parts and composite materials for non-assembly parts, a lightweight design is carried out for the structure and materials of the given casing, and a three-dimensional model of the casing is established using SolidWorks software.

[0008] S2. Use Hypermesh software to mesh the 3D model established in step S1;

[0009] S3. Obtain the basic mechanical properties of each material through tensile, compression, bending and shear tests. Use Comsol software to establish the properties of each material through the basic mechanical properties under global definition, and assign different material properties to the corresponding parts according to the principles described above in the solid mechanics physical field.

[0010] S4. Set up contact pairs according to the actual connection method of each part of the casing. The contact pairs include adhesive contact pairs using adhesive bonding and bolt contact pairs using bolt bonding. Specifically: the adhesive layer model is established using the cohesive force model and the adhesive material properties are input to simulate the adhesive contact pairs; the bolt contact pairs are simulated using the pin fastener model and the friction coefficient is given.

[0011] S5. Within the solid mechanical physical field constructed in step S3, set the boundary conditions of loads and constraints according to the actual working conditions of the casing.

[0012] S6. Establish steady-state study, perform calculations and solutions using a steady-state solver, and obtain the stress, strain and deformation distribution cloud map generated on the casing after bearing the load from the calculation results. Insert a maximum value probe to obtain the maximum values ​​of stress, strain and deformation and the coordinates of their positions. Insert a probe to obtain the calculated values ​​of stress, strain and deformation at any position.

[0013] Preferably, the specific implementation process of step S1 includes the following steps:

[0014] S101. Using the given casing model as a reference input, without changing the size and basic structural features, disassemble the given casing model into an upper metal insert, a composite material conical shell, a lower metal insert, and a reinforcing rib structure.

[0015] S102. The upper metal insert, composite material conical shell, lower metal insert and reinforcing rib structure are reassembled into a lightweight casing model through the assembly function.

[0016] S103. Simplify the casing model appropriately, and omit the rounded corner structure and stepped structure design in the given casing model that are not convenient for finite element calculation or can increase the convergence difficulty and reduce the calculation accuracy.

[0017] Preferably, the specific implementation process of step S2 includes the following steps:

[0018] S201. Import the chassis model created in step S101 into Hypermesh software as a Step format file;

[0019] S202. Generate a regularly arranged quadrilateral mesh on the outer surface of the casing model. For areas with holes on the surface, generate a mesh for the holes and the surrounding reasonable area by manually drawing lines and locally refine the mesh.

[0020] S203. Use the solid map function to map the surface mesh generated in step S202 to the other side of the surface to form a hexahedral mesh. Use the sweep method to extend the hexahedral mesh to the entire body of revolution.

[0021] S204. Repeat steps S202 and S203 until the entire casing model is meshed.

[0022] Preferably, the specific implementation process of step S3 includes the following steps:

[0023] S301. Perform tensile, compression, bending and shear tests on the carbon fiber composite laminate used to manufacture the conical shell of the casing according to the standard, obtain the basic mechanical property parameters, and establish a dataset.

[0024] S302. Establish the properties of T800 / WC502 carbon fiber composite material using linear elastic material-orthotropic material, inputting ρ and E. 12 E 13 E 23 ν 12 ν 13 ν 23 G 12 G 13 and G 23 Where: ρ is the density of the composite material, E 12 E 13 and E 23 These are the Young's moduli of the composite material in the fiber length direction, perpendicular to the fiber length direction, and thickness direction, respectively. 12 ν 13 and ν 23 These are the Poisson's ratios of the composite material in the fiber length direction, perpendicular to the fiber length direction, and thickness direction, respectively. 12 G 13 and G 23 These are the shear moduli of the composite material in the fiber length direction, perpendicular to the fiber length direction, and thickness direction, respectively.

[0025] S303. Use linear elastic-isotropic materials to establish the material properties of ZM6 cast magnesium alloy and 304 stainless steel. Input ρ1, ρ2, E1, E2, ν1 and ν2, where: ρ1 is the density of ZM6 cast magnesium alloy, ρ2 is the density of 304 stainless steel, E1 is the Young's modulus of ZM6 cast magnesium alloy, E2 is the Young's modulus of 304 stainless steel, ν1 is the Poisson's ratio of ZM6 cast magnesium alloy, and ν2 is the Poisson's ratio of 304 stainless steel.

[0026] S304. Based on the material allocation scheme of metal insert - ZM6 cast magnesium alloy, conical shell part - T800 / WC502 carbon fiber composite material, and pin fastener - 304 stainless steel, assign the material properties established in steps S302 and S303 to different parts of the model respectively.

[0027] Preferably, the specific implementation process of step S4 includes the following steps:

[0028] S401. Based on the actual connection method of each part of the casing, select the contact surface of each connection and establish contact pairs in sequence; wherein: the selection principle of the contact surface follows the principle of using materials with low stiffness, parts with high mesh quality, parts with convex surfaces and parts with large surface areas as the source surface, and the remaining surfaces as the target surface.

[0029] S402. For adhesive contacts using adhesive bonding, establish an adhesive layer model using a cohesive force model, and input the material properties of SW-200 adhesive. , , , , and Simulation, in which: It is the Young's modulus of the adhesive. It is the Poisson's ratio of the adhesive. It is the tensile strength of the material. It is the shear strength of the material. It is the energy release rate during material tensile testing. It is the material's shear energy release rate;

[0030] S403. For bolted connections using pin fasteners, simulate the Coulomb friction model with a given friction coefficient μ.

[0031] S404. Set the contact method for both adhesive contact pairs and bolt contact pairs to the penalty function method.

[0032] Preferably, the specific implementation process of step S5 includes the following steps:

[0033] S501. Set the N bolt holes of the metal insert at the lower end of the casing to a fixed constraint state to simulate the installation and fixing state of the casing in the transmission system.

[0034] S502. Apply a combined load to the mounting position of the casing bearing and the end face of the metal insert at the top of the casing, and input the corresponding force and torque values ​​respectively.

[0035] Preferably, the specific implementation process of step S6 includes the following steps:

[0036] S601. Establish a steady-state study, select a steady-state solver for iterative solution, and set the relative tolerance and maximum number of iterations;

[0037] S602. Set the number of cores for calculation and perform the calculation;

[0038] S603. From the obtained calculation results, extract the stress, strain and deformation distribution cloud map generated on the casing after bearing the load, insert the maximum value probe, obtain the maximum stress, strain and deformation values ​​and the coordinates of their generation positions, and insert the probe to obtain the calculated values ​​of stress, strain and deformation at any position.

[0039] Beneficial effects

[0040] (1) The present invention prepares a small sample of carbon fiber composite laminate for manufacturing the cone shell part in the middle of the casing, and conducts tensile, compression, bending and shear mechanical property tests on it. The equivalent basic elastic and strength mechanical properties of the laminate as a whole under a specific layup scheme are obtained, and the material property model of the composite material part is established in the simulation analysis process. This avoids the cumbersome process of using the properties of a single layer of composite material to set up the layup in the traditional method, as well as the inconvenience when analyzing objects with irregular structures. It effectively improves the efficiency of analysis settings and provides convenience for analyzing objects with relatively complex structural features.

[0041] (2) By simplifying the three-dimensional model of the analysis object, this invention omits structures such as rounded chamfers, irregular holes and some bosses that have little impact on the overall mechanical performance in the process of establishing the finite element analysis model without affecting or changing the structural bearing form, load transfer form and mechanical behavior of the analysis object. This effectively reduces the number of meshes, reduces the complexity of the model and calculation, and improves the convergence and efficiency of the calculation.

[0042] (3) This invention simulates adhesive bonding using a linear cohesive force model and mechanical fastener connection using a Coulomb friction model. It also uses the properties of the actual resin adhesive material as the adhesive layer attribute and the friction coefficient to describe the contact between the pin fastener and the connected object, accurately simulating the hybrid adhesive-mechanical connection behavior of the casing. Furthermore, it applies the traction-separation law and displacement-based damage to accurately simulate the damage to the adhesive layer after the casing is loaded, providing a reference for observing adhesive layer damage in connection structures that is difficult to observe due to obstruction, and providing a basis for structural optimization design and targeted reinforcement under specific load conditions. Experimental verification shows that the strain obtained by the simulation analysis method established in this invention at the selected measurement position on the casing surface has an error of less than 15% compared to the strain collected by strain gauges at the same position in the experiment, proving the reliability of the analysis method. Attached Figure Description

[0043] Figure 1 This is a flowchart of the simulation analysis of the strength of the casing rubber-screw hybrid connection based on circumferential connection as described in this invention;

[0044] Figure 2 This is the original three-dimensional model of the casing, the object of analysis in this invention;

[0045] Figure 3 This invention analyzes the material distribution scheme after the reconstruction of the casing;

[0046] Figure 4 This is the three-dimensional model of the reconstructed casing, the object of analysis in this invention;

[0047] Figure 5 This is the mesh model of the casing, the object of analysis in this invention;

[0048] Figure 6 This is a schematic diagram of the connection parts and form of the casing, the object of analysis in this invention;

[0049] Figure 7 This is a schematic diagram of the load borne by the casing, the object of analysis in this invention;

[0050] Figure 8 This is a cloud map of the analysis results of an embodiment provided by the present invention;

[0051] Figure 9 This is a diagram showing the damage to the adhesive layer. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0053] A certain type of casing is a transmission system component. One end is assembled with the main casing, and a drive shaft passes through the circular bearing housing in the middle. During the operation of the transmission system, these two locations will be subjected to loads transmitted from the main casing and the drive shaft, respectively. The casing was originally cast using magnesium alloy material. Now, it is necessary to replace magnesium alloy material with composite material to achieve the goal of lightweight design, reduce component weight, and improve transmission system capacity. However, due to the curing deformation of composite materials, it is difficult to control the dimensional accuracy after molding. Therefore, the original magnesium alloy material must still be used at the assembly location to ensure assembly requirements. This structural design will introduce the problem of connecting composite materials and magnesium alloy materials. Under complex operating load conditions, the connection points are likely to become weak points in the overall structure.

[0054] To address the aforementioned needs and existing problems, this embodiment employs a simulation analysis method for the strength of a casing with a hybrid rubber-screw connection based on circumferential connection, as proposed in this invention. This method analyzes the connection strength of the casing during the design phase, providing a reference for subsequent structural optimization and molding process formulation.

[0055] As an embodiment of the present invention, reference Figure 1 A simulation analysis method for the strength of a casing rubber-screw hybrid connection based on circumferential connection includes the following steps:

[0056] S1: Reference Figure 2 Using the original casing model as a reference, and without changing its dimensions and basic structural features, the given casing model is disassembled into an upper metal insert, a composite material conical shell, and a lower metal insert. The generated parts and their materials are as follows: Figure 3 As shown;

[0057] S2: Assemble the various components into a lightweight chassis model;

[0058] S3: Remove or eliminate structural elements that are inconvenient for finite element analysis, such as fillets and bosses, to finally generate a 3D model of the casing for finite element analysis. Figure 4 As shown;

[0059] S4: Import the 3D model of the casing into Hypermesh software in step format, divide the 3D model of the casing into multiple parts in the direction of rotation, create a quadrilateral mesh on the outer surface of the 3D model of the casing, and map it to the opposite surface using the solidmap function.

[0060] S5: Extend the generated mesh to the entire body of revolution using a sweeping method. The resulting mesh model is as follows: Figure 5 As shown;

[0061] S6: Import the mesh file into Comsol software in bdf format. Use the statistics function to count the number of meshes and check the mesh quality. When the vast majority of meshes are on the right side of the mesh quality histogram, the mesh quality is considered to be qualified.

[0062] S7: Conduct basic mechanical property tests on composite laminates and establish an experimental dataset;

[0063] S8: Add solid mechanics physics fields, and establish a T800 / WC502 carbon fiber composite material model using a linear elastic material-orthotropic material, setting ρ=1550kg / m. 3 E 12 =74.19GPa, E 13 =46.26GPa, E 23 =46.26GPa, ν 12 =0.3、ν 13 =0.3、ν 23 =0.3, G 12 =15.1GPa, G 13 =14.8 GPa and G 23 =15.1 GPa, where: ρ is the density of the composite material, E 12 E 13 and E 23 These are the Young's moduli of the composite material in the fiber length direction, perpendicular to the fiber length direction, and thickness direction, respectively. 12 ν 13 and ν 23 These are the Poisson's ratios of the composite material in the fiber length direction, perpendicular to the fiber length direction, and thickness direction, respectively. 12 G 13 and G 23These are the shear moduli of the composite material along the fiber length direction, perpendicular to the fiber length direction, and in the thickness direction, respectively. ZM6 cast magnesium alloy and 304 stainless steel material models were established using linear elastic-isotropic materials, and the following parameters were input: =1800kg / m 3 , =7930kg / m 3 E1=47GPa, E2=192GPa, ν1=0.28 and ν2=0.3, where ρ1 is the density of ZM6 cast magnesium alloy, ρ2 is the density of 304 stainless steel, E1 is the Young's modulus of ZM6 cast magnesium alloy, E2 is the Young's modulus of 304 stainless steel, ν1 is the Poisson's ratio of ZM6 cast magnesium alloy, and ν2 is the Poisson's ratio of 304 stainless steel;

[0064] S9: Based on the actual contact situation of each part of the casing, select each surface that makes contact and establish contact pairs in sequence, including the contact parts and interfaces of adhesive and mechanical connections, such as... Figure 6 As shown;

[0065] S10: For contact pairs using adhesives, establish an adhesive layer model using a cohesive force model and set the material properties of SW-200 adhesive. =3.6GPa =0.3、 =22MPa =22MPa =1.2kJ / m 2 and =1.2kJ / m 2 ,in: It is the Young's modulus of the adhesive. It is the Poisson's ratio of the adhesive. It is the tensile strength of the material. It is the shear strength of the material. It is the energy release rate during material tensile testing. It is the material's shear energy release rate;

[0066] S11: For contact pairs mechanically connected using pin fasteners, use the Coulomb friction model and give a friction coefficient μ=0.5;

[0067] S12: Set the 15 bolt holes on the metal insert at the lower end of the casing to a fixed constraint state, constraining all degrees of freedom;

[0068] S13: Reference Figure 7The load-bearing positions of the casing are shown. A combined load Fx1 = 20000 N, Fy1 = -7500 N, and Fz1 = 7500 N are applied to the bearing mounting area of ​​the lower metal insert of the casing (load-bearing position 1), where Fx1 is the X-direction force load, Fy1 is the Y-direction force load, and Fz1 is the Z-direction force load; the symbols represent the directions. A combined load Fx2 = -400 N is applied to the end face of the upper metal insert of the casing (load-bearing position 2). 0N, Fy2=6000N, Fz2=-9000N, Mx=4500N·m, My=8000N·m, Mx=-2500N·m, where: Fx2 is the X-direction force load borne by this part, Fy2 is the Y-direction force load borne by this part, Fz2 is the Z-direction force load borne by this part, Mx is the X-direction moment load borne by this part, My is the Y-direction moment load borne by this part, and Mz is the Z-direction moment load borne by this part. The symbols represent the directions.

[0069] S14: Establish a steady-state study, select a steady-state solver for iterative solution, set the relative tolerance to 0.001 and the maximum number of iterations to 25, set the number of computational cores to 40, and submit the solution calculation;

[0070] S15: Obtain the calculation results, extract the stress, strain, and deformation distribution cloud map generated on the casing after load bearing, insert the maximum value probe, obtain the maximum stress, strain, and deformation values ​​and their location coordinates, insert the probe to obtain the calculated stress, strain, and deformation values ​​at any location, and calculate the obtained casing stress, strain, and deformation distribution as follows. Figure 8 As shown, the calculation results of the adhesive layer damage are as follows: Figure 9 As shown.

Claims

1. A simulation analysis method for the strength of a casing-mounted rubber-screw hybrid connection based on circumferential connection, characterized in that: Includes the following steps: S1. Following the principle of using metal materials for assembly parts and composite materials for non-assembly parts, a lightweight design is carried out for the structure and materials of the given casing, and a three-dimensional model of the casing is established using SolidWorks software. S2. Use Hypermesh software to mesh the 3D model. During the meshing process, for areas with holes on the surface, generate a mesh for the holes and the surrounding area within a reasonable range by manually drawing lines and locally refine the mesh. S3. Obtain the basic mechanical properties of each material through tensile, compression, bending and shear tests. Use Comsol software to establish the properties of each material through the basic mechanical properties under global definition, and assign different material properties to the corresponding parts according to the principles described above in the solid mechanics physical field. S4. Based on the actual connection method of each part of the casing, the contact pairs are set using a penalty function. The contact pairs include adhesive contact pairs using adhesive bonding and bolt contact pairs using bolt bonding. Specifically: the adhesive layer model is established using the cohesive force model and the adhesive material properties are input to simulate the adhesive contact pairs; the bolt contact pairs are simulated using the pin fastener model and the friction coefficient is given. S5. Within the solid mechanical physical field, loads are set at the loaded positions according to the actual working conditions of the casing; the holes are set to a fixed constraint state, constraining all degrees of freedom; S6. By establishing a steady-state study, the steady-state solver is used to perform calculations and solutions. The stress, strain and deformation distribution cloud map generated on the casing after bearing the load is obtained from the calculation results. The maximum value probe is inserted to obtain the maximum values ​​of stress, strain and deformation and the coordinates of their positions. The probe is inserted to obtain the calculated values ​​of stress, strain and deformation at any position.

2. The simulation analysis method for the strength of a casing-mounted rubber-screw hybrid connection based on circumferential connection according to claim 1, characterized in that: The specific implementation process of step S1 includes the following steps: S201. Using the given casing model as a reference input, without changing the size and basic structural features, disassemble the given casing model into an upper metal insert, a composite material conical shell, a lower metal insert, and a reinforcing rib structure. S202. The upper metal insert, composite material conical shell, lower metal insert and reinforcing rib structure are reassembled into a lightweight casing model through the assembly function. S203. The casing model is appropriately simplified by omitting rounded corner and stepped structure designs that are inconvenient for finite element calculation or can increase convergence difficulty and reduce calculation accuracy.

3. The simulation analysis method for the strength of a casing-mounted rubber-screw hybrid connection based on circumferential connection according to claim 1, characterized in that: The specific implementation process of step S2 includes the following steps: S301. Import the chassis model created in step S101 into Hypermesh software as a Step format file; S302. Generate a regularly arranged quadrilateral mesh on the outer surface of the casing model. For areas with holes on the surface, generate a mesh for the holes and the surrounding reasonable area by manually drawing lines and locally refine the mesh. S303. Use the solid map function to map the surface mesh generated in step S202 to the other side of the surface to form a hexahedral mesh. Use the sweep method to extend the hexahedral mesh to the entire body of revolution. S304. Repeat steps S302 and S303 until the entire casing model is meshed.

4. The simulation analysis method for the strength of a casing-mounted rubber-screw hybrid connection based on circumferential connection according to claim 1, characterized in that: The specific implementation process of step S3 includes the following steps: S401. Perform tensile, compression, bending and shear tests on the carbon fiber composite laminate used to manufacture the conical shell of the casing according to the standard, obtain the basic mechanical property parameters, and establish a dataset. S402. Establish the properties of T800 / WC502 carbon fiber composite material using linear elastic material-orthotropic material, inputting ρ and E. 12 E 13 E 23 ν 12 ν 13 ν 23 G 12 G 13 and G 23 , Where: ρ is the density of the composite material, E 12 E 13 and E 23 These are the Young's moduli of the composite material in the fiber length direction, perpendicular to the fiber length direction, and thickness direction, respectively. 12 ν 13 and ν 23 These are the Poisson's ratios of the composite material in the fiber length direction, perpendicular to the fiber length direction, and thickness direction, respectively. 12 G 13 and G 23 These are the shear moduli of the composite material in the fiber length direction, perpendicular to the fiber length direction, and thickness direction, respectively. S403. Use linear elastic-isotropic materials to establish the material properties of ZM6 cast magnesium alloy and 304 stainless steel. Input ρ1, ρ2, E1, E2, ν1 and ν2, where: ρ1 is the density of ZM6 cast magnesium alloy, ρ2 is the density of 304 stainless steel, E1 is the Young's modulus of ZM6 cast magnesium alloy, E2 is the Young's modulus of 304 stainless steel, ν1 is the Poisson's ratio of ZM6 cast magnesium alloy, and ν2 is the Poisson's ratio of 304 stainless steel. S404. Based on the material allocation scheme of metal insert - ZM6 cast magnesium alloy, conical shell part - T800 / WC502 carbon fiber composite material, and pin fastener - 304 stainless steel, assign the material properties established in steps S402 and S403 to different parts of the model respectively.

5. The simulation analysis method for the strength of a casing-mounted rubber-screw hybrid connection based on circumferential connection according to claim 1, characterized in that: The specific implementation process of step S4 includes the following steps: S501. Based on the actual connection method of each part of the casing, select the contact surfaces of each connection and establish contact pairs in sequence; wherein: the selection principle of the contact surfaces follows the principle of using materials with low stiffness, parts with high mesh quality, parts with convex surfaces and parts with large surface areas as source surfaces, and the remaining surfaces as target surfaces. S502. For adhesive contacts using adhesive bonding, establish an adhesive layer model using a cohesive force model and input the material properties of SW-200 adhesive. , , , , and Simulation, in which: It is the Young's modulus of the adhesive. It is the Poisson's ratio of the adhesive. It is the tensile strength of the material. It is the material's shear strength. It is the energy release rate during material tensile testing. It is the material's shear energy release rate; S503. For bolted connections using pin fasteners, the Coulomb friction model is used to simulate the bolt contact pairs with a given friction coefficient μ. S504. Set both adhesive contact pairs and bolt contact pairs as penalty functions.

6. The simulation analysis method for the strength of a casing-mounted rubber-screw hybrid connection based on circumferential connection according to claim 1, characterized in that: The specific implementation process of step S5 includes the following steps: S601. Set the N bolt holes of the metal insert at the lower end of the casing to a fixed constraint state to simulate the installation and fixing state of the casing in the transmission system. S602. Apply a combined load to the mounting position of the casing bearing and the end face of the metal insert at the top of the casing, and input the corresponding force and torque values ​​respectively.

7. The simulation analysis method for the strength of a casing-mounted rubber-screw hybrid connection based on circumferential connection according to claim 1, characterized in that: The specific implementation process of step S6 includes the following steps: S701. Establish a steady-state study, select a steady-state solver for iterative solution, and set the relative tolerance and maximum number of iterations; S702. Set the number of cores for calculation and perform calculations to solve the problem; S703. From the obtained calculation results, extract the stress, strain and deformation distribution cloud map generated on the casing after bearing the load, insert the maximum value probe, obtain the maximum stress, strain and deformation values ​​and the coordinates of their generation positions, and insert the probe to obtain the calculated values ​​of stress, strain and deformation at any position.

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