Full-process simulation method for laser shock peening of linear friction welding head

Abstract

The invention discloses a full-process simulation method for laser shock peening of a linear friction welding head, and belongs to the technical field of solid-phase welding and surface strengthening numerical simulation. According to the method, the linear friction welding process is simulated firstly, and then the cutting process and the stress relief annealing process are simulated on the basis of the simulation result, so that the purposes of removing the flash and releasing the residual stress of the linear friction welding joint are achieved. Then simulation of the laser shock peening process is further carried out on the basis of simulation results of the previous steps, full-process simulation of linear friction welding, cutting, stress relief annealing and laser shock peening is achieved, and the method has the advantages of improving the accuracy of the result of the laser shock peening simulation residual stress field of the linear friction welding head and shortening the research and development period. The research and development cost is reduced, and a certain promotion effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of solid phase welding and surface strengthening numerical simulation, and more specifically to a full-process simulation method for laser shock strengthening of a linear friction welding joint. Background Art

[0002] Linear friction welding is an advanced solid-phase welding method that integrates welding, plastic processing, tribology and other technologies. Specifically, two weldments are driven by a power source to perform linear reciprocating motion at a certain vibration frequency and amplitude. The friction between the contact surfaces generates heat to produce a high-temperature viscous-plastic metal layer at the welding interface, and solid-state connection is completed under the action of friction pressure. It has the advantages of simple process, no pollution, and high efficiency. At the same time, the joint performance is better than traditional fusion welding. Therefore, linear friction welding has become a key technology in the manufacturing process of integral blades of aircraft engines.

[0003] Although the linear friction welding joint has excellent performance, the weld area on the integral blade is close to the maximum stress area. Its harsh service conditions put higher requirements on the fatigue performance of the joint, and it is urgent to carry out surface strengthening and life extension treatment. Laser shock strengthening is a new type of surface modification technology. It uses high-energy laser beams to bombard the surface of the material to form high-temperature and high-pressure plasma, inducing severe plastic deformation of the surface material. It is a non-contact surface strengthening method that is not easy to cause mechanical damage to the material. At the same time, it has strong controllability, high precision, and no pollution to the environment.

[0004] However, the current laser shock strengthening simulation process has the problem of not fully introducing the residual stress of the weld joint after welding, cutting, and stress relief annealing processes; the current domestic research focus on the surface strengthening of the integral blade of an aero-engine is mainly concentrated on blade strengthening, and there is a lack of relevant research on the laser shock strengthening method of linear friction welding welds. Therefore, it is urgent to provide a full-process simulation method for laser shock strengthening of linear friction welding joints, which can play a certain role in improving the accuracy of the residual stress field results of the laser shock strengthening simulation of linear friction welding joints, shortening the R&D cycle, and reducing the R&D cost. Summary of the invention

[0005] In view of this, the present invention provides a full-process simulation method for laser shock strengthening of linear friction welding joints, which combines the linear friction welding process, the process of cutting the flash of the welding joint, the process of stress relief annealing to release the residual stress, and the laser shock strengthening process of the welding joint in a sequential order to simulate the entire process, thereby overcoming the problem that the current laser shock strengthening simulation process does not fully introduce the residual stress of the welding joint after welding, cutting, and stress relief annealing processes, and plays a certain role in improving the accuracy of the residual stress field results of the laser shock strengthening simulation of linear friction welding joints, shortening the R&D cycle, and reducing the R&D cost.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] The embodiment of the present invention provides a full-process simulation method for laser shock strengthening of a linear friction welding joint, the method comprising the following steps:

[0008] Step 1: The finite element numerical simulation of the linear friction welding process is carried out in ABAQUS finite element software, including the following steps:

[0009] Step 1.1: Establish the three-dimensional geometric model of the two weldments and assemble them;

[0010] Step 1.2: Set the material property parameters required for linear friction welding finite element numerical simulation;

[0011] Step 1.3: Establish two temperature-displacement coupled dynamic explicit analysis steps to simulate the welding process and post-weld cooling process respectively;

[0012] Step 1.4: Establish the contact relationship between the two weldments, including normal contact behavior, tangential contact behavior, heat conduction and heat generation conditions, etc.;

[0013] Step 1.5: Set welding process parameters and boundary conditions, and apply a predefined temperature field;

[0014] Step 1.6: Set the mesh properties and divide the mesh;

[0015] Step 1.7: Submit the job, perform simulation calculations, and obtain the linear friction welding joint.

[0016] Step 2: Perform finite element numerical simulation of the cutting process of the linear friction welding joint obtained in step 1 in ABAQUS finite element software, including the following steps:

[0017] Step 2.1: Export the linear friction welding joint geometry and mesh model obtained in step 1, re-divide the model mesh, and map the residual stress field to the new mesh model;

[0018] Step 2.2: Establish a geometric model of the tool component and set it as a rigid body, and assemble it with the linear friction welding joint obtained in step 2.1;

[0019] Step 2.3: Set the material properties for the tool and add the material parameters required for cutting simulation such as shear damage in the material properties of the weldment;

[0020] Step 2.4: Establish a dynamic display analysis step of temperature-displacement coupling to simulate the process of tool cutting the flash of linear friction welding joint;

[0021] Step 2.5: Set the contact relationship between the tool and the joint cutting path surface, including normal contact behavior, tangential contact behavior, etc.;

[0022] Step 2.6: Set the process parameters and boundary conditions such as cutting speed;

[0023] Step 2.7: applying a predefined temperature field, and setting the residual stress field of the linear friction welding joint obtained in step 2.1 as a predefined field;

[0024] Step 2.8: Set the mesh properties and divide the tool mesh;

[0025] Step 2.9: Submit the job and perform simulation calculation to obtain the linear friction welding joint after the flash cutting is completed.

[0026] The purpose of the cutting simulation involved in step 2 is to remove flash and release residual stress, which is beneficial to the subsequent laser shock strengthening process.

[0027] Step 3: Perform finite element numerical simulation of the stress relief annealing process of the linear friction welding joint after the flash cutting obtained in step 2 in ABAQUS finite element software, including the following steps:

[0028] Step 3.1: Export the geometry and mesh model of the linear friction welding joint after the flash cutting is completed, re-divide the model mesh, and map the residual stress field to the new mesh model;

[0029] Step 3.2: Set the material properties of the two weldments required for stress relief annealing simulation;

[0030] Step 3.3: Establish two temperature-displacement coupled implicit analysis steps to simulate the heating and holding process and cooling process in stress relief annealing respectively;

[0031] Step 3.4: Set the boundary conditions for heating and cooling required for stress relief annealing;

[0032] Step 3.5: applying a predefined temperature field, and setting the residual stress field of the linear friction welding joint after flash cutting obtained in step 3.1 as a predefined field;

[0033] Step 3.6: Set the grid properties;

[0034] Step 3.7: Submit the job and perform simulation calculation to obtain the linear friction welding joint after stress relief annealing.

[0035] The purpose of the stress relief annealing involved in step 3 is to release some of the residual stress generated during the linear friction welding and cutting process.

[0036] Step 4: Perform finite element numerical simulation of the laser shock strengthening process on the linear friction welding joint after stress relief annealing obtained in step 3 in ABAQUS finite element software, including the following steps:

[0037] Step 4.1: Export the geometry and mesh model of the linear friction welding joint after stress relief annealing, re-divide the model mesh, and map the residual stress field to the new mesh model;

[0038] Step 4.2: Set the material properties of the two weldments required for laser shock peening simulation;

[0039] Step 4.3: Establish a dynamic explicit analysis step to simulate the laser shock processing process;

[0040] Step 4.4: Determine the load field and impact trajectory required for laser loading according to the laser impact process parameters;

[0041] Step 4.5: setting the residual stress field of the linear friction welding joint after stress relief annealing obtained in step 4.1 as a predefined field;

[0042] Step 4.6: Set the grid properties;

[0043] Step 4.7: Submit the job and perform simulation calculations to obtain the linear friction welding joint after laser shock strengthening, so as to complete the full process simulation of linear friction welding-cutting-stress relief annealing-laser shock strengthening; after the full process simulation is completed, create the surface path of the joint after cutting the flash, and extract the Mises equivalent residual stress on the path after each step.

[0044] In an optional embodiment, the three-dimensional geometric model established in step 1.1 may use two deformable body models, or one of the weldments may be replaced by a rigid body in consideration of the symmetric characteristics of the linear friction welding process.

[0045] In an optional embodiment, the material properties involved in the full-process simulation include density, elastic modulus, Poisson's ratio, thermal expansion coefficient, specific heat, thermal conductivity, plastic constitutive model, shear damage parameter, etc., wherein the plastic constitutive model in the present invention selects the Johnson-Cook constitutive model.

[0046] In an optional embodiment, in the temperature-displacement coupled dynamic explicit analysis steps set in steps 1.3 and 2.4, ALE adaptive meshes are used for both the welding interface area and the cutting surface portion, which can adapt to large deformation behaviors during linear friction welding or cutting.

[0047] In an optional embodiment, the unit type selected in step 1.6, step 2.8 and step 3.6 is an eight-node thermally coupled hexahedral unit C3D8RT, and the unit type selected in step 4.6 is an eight-node linear hexahedral unit C3D8R, both of which use reduced integration and hourglass control. In step 2.8, a unit deletion attribute should also be added during the cutting simulation to achieve timely deletion of cutting debris.

[0048] In an optional embodiment, the linear friction welding process, cutting process, stress relief annealing process and laser shock strengthening process involved in the full-process simulation have different requirements for the mesh refinement area and size of the model. Therefore, the model mesh is re-divided in steps 2.1, 3.1 and 4.1, and the mesh re-division process is performed using Hypermesh software.

[0049] In an optional embodiment, the load field and laser shock path of laser loading in step 4.4 are both implemented through a subroutine, and a Gaussian distributed stress field is used to simulate the stress application during the laser loading process.

[0050] Compared with the prior art, the present invention has at least the following beneficial effects:

[0051] The present invention provides a full-process simulation method for laser shock strengthening of linear friction welding joints. The present invention first simulates the linear friction welding process, and then simulates the cutting process and the stress relief annealing process based on the simulation results to achieve the purpose of removing flash and releasing the residual stress of the linear friction welding joint. After that, the laser shock strengthening process is further simulated based on the simulation results of the previous steps, and the full-process simulation of linear friction welding-cutting-stress relief annealing-laser shock strengthening is achieved, which plays a certain role in improving the accuracy of the residual stress field results of the laser shock strengthening simulation of the linear friction welding joint, shortening the research and development cycle, and reducing the research and development cost.

[0052] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0053] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0056] Figure 1 A schematic flow chart of the full-process simulation method for laser shock strengthening of linear friction welding joints provided by the present invention.

[0057] Figure 2 This is a schematic diagram of the three-dimensional geometric model provided by the present invention.

[0058] Figure 3 Schematic diagram of residual stress variation along Path 1 after each step in an embodiment of the present invention.

[0059] Figure 4 This is a schematic diagram of the structure of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0060] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0061] In the description of the present invention, it should be noted that: in some processes described in the specification and drawings of this application, multiple operations appearing in a specific order are included, but it should be clearly understood that these operations may not be performed in the order in which they appear in this document or may be performed in parallel. In addition, various serial numbers are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0062] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] See also Figure 1 As shown, the present invention provides a full-process simulation method for laser shock strengthening of a linear friction welding joint, and the method is mainly implemented according to the following steps:

[0064] Step 1: The finite element numerical simulation of the linear friction welding process is carried out in ABAQUS finite element software, including the following steps:

[0065] Step 1.1: Establish weldment geometry model: The three-dimensional geometry model used is two deformable body models, and the dimensions of the components are 18×12×40mm. Figure 2 As shown;

[0066] Step 1.2: Set the material property parameters required for the finite element numerical simulation of linear friction welding: The material used is TC4 titanium alloy commonly used in the linear friction welding process. The material properties include density, elastic modulus, Poisson's ratio, thermal expansion coefficient, specific heat, thermal conductivity, plastic constitutive model, etc. The plastic constitutive model uses the Johnson-Cook constitutive model, and the formula is as follows:

[0067]

[0068] Where σ is the Von Mises flow stress, ε is the equivalent plastic strain, A, B and n are the yield strength, strain hardening coefficient and strain hardening exponent of the material at the reference temperature, respectively. is the strain rate, is the reference strain rate, C is the strain rate sensitivity coefficient, T m is the melting point temperature of the material, T r is the reference temperature, and m is the temperature softening index. The JC model used in the present invention is shown in Table 1:

[0069] Table 1 J-C model parameters

[0070] Alloy Type A / MPa B / MPa n C m <![CDATA[T m / ℃]]> TC4 935.74 868.65 0.7485 0.032 0.766 1650

[0071] Step 1.3: Establish two temperature-displacement coupled dynamic explicit analysis steps to simulate the welding process and post-weld cooling process respectively;

[0072] Step 1.4: Establish the contact relationship between the two weldments, including normal contact behavior, tangential contact behavior, heat conduction and heat generation conditions, etc. The tangential contact behavior is represented by a penalty function, and the friction coefficient varies with temperature; (The analysis step type and the establishment of contact relationship are both implemented by the built-in function module of ABAQUS finite element software, and will not be introduced in detail here);

[0073] Step 1.5: Set the welding process parameters and boundary conditions, and apply a predefined temperature field of room temperature 25°C. The welding parameters used are shown in Table 2:

[0074] Table 2 Welding parameters

[0075] Amplitude / mm Frequency / Hz Friction pressure / MPa Upsetting pressure / MPa 3 60 80 80

[0076] Step 1.6: Set the mesh properties and divide the mesh. The element type is eight-node thermally coupled hexahedral element C3D8RT.

[0077] Step 1.7: Submit the job, perform simulation calculations, and obtain the linear friction welding joint.

[0078] Step 2: Perform finite element numerical simulation of the cutting process of the linear friction welding joint obtained in step 1 in ABAQUS finite element software, including the following steps:

[0079] Step 2.1: Export the linear friction welding joint geometry and mesh model obtained in step 1, re-divide the model mesh, and map the residual stress field to the new mesh model;

[0080] Step 2.2: Establish a geometric model of the tool component and set it as a rigid body, and assemble it with the linear friction welding joint obtained in step 2.1;

[0081] Step 2.3: Set the material properties for the tool and add the material parameters required for cutting simulation such as shear damage in the material properties of the weldment: the tool material used is carbon tool steel, and the set material properties include elasticity, plasticity, density, etc.;

[0082] Step 2.4: Establish a dynamic display analysis step of temperature-displacement coupling to simulate the process of tool cutting the flash of linear friction welding joint, in which the tangential contact behavior is represented by a penalty function;

[0083] Step 2.5: Set the contact relationship between the tool and the joint cutting path surface, including normal contact behavior, tangential contact behavior, etc.;

[0084] Step 2.6: Set the process parameters and boundary conditions such as cutting speed: the cutting speed used is 10 mm / s;

[0085] Step 2.7: applying a predefined temperature field of room temperature 25°C, and setting the residual stress field of the linear friction welding joint obtained in step 2.1 as a predefined field;

[0086] Step 2.8: Set the mesh properties and divide the tool mesh. The unit type is eight-node thermally coupled hexahedral unit C3D8RT;

[0087] Step 2.9: Submit the job and perform simulation calculation to obtain the linear friction welding joint after the flash cutting is completed.

[0088] Step 3: Perform finite element numerical simulation of the stress relief annealing process of the linear friction welding joint after the flash cutting obtained in step 2 in ABAQUS finite element software, including the following steps:

[0089] Step 3.1: Export the geometry and mesh model of the linear friction welding joint after the flash cutting is completed, re-divide the model mesh, and map the residual stress field to the new mesh model;

[0090] Step 3.2: Set the material properties of the two weldments required for stress relief annealing simulation, including density, thermal expansion coefficient, specific heat, thermal conductivity, plasticity, elasticity, etc.;

[0091] Step 3.3: Establish two temperature-displacement coupled implicit analysis steps to simulate the heating and holding process and cooling process in stress relief annealing respectively;

[0092] Step 3.4: Set the boundary conditions of heating and cooling required for stress relief annealing: the stress relief annealing temperature of TC4 titanium alloy used is 600℃, the heating and cooling rates are both set to 1℃ / s, and the holding time is 1h;

[0093] Step 3.5: applying a predefined temperature field of room temperature 25°C, and setting the residual stress field of the linear friction welding joint after flash cutting obtained in step 3.1 as a predefined field;

[0094] Step 3.6: Set the mesh properties and the element type to eight-node thermally coupled hexahedral element C3D8RT;

[0095] Step 3.7: Submit the job and perform simulation calculation to obtain the linear friction welding joint after stress relief annealing.

[0096] Step 4: Perform finite element numerical simulation of the laser shock strengthening process on the linear friction welding joint after stress relief annealing obtained in step 3 in ABAQUS finite element software, including the following steps:

[0097] Step 4.1: Export the geometry and mesh model of the linear friction welding joint after stress relief annealing, re-divide the model mesh, and map the residual stress field to the new mesh model;

[0098] Step 4.2: Set the material properties of the two welds required for laser shock peening simulation, including density, elasticity, plasticity, etc.

[0099] Step 4.3: Establish a dynamic explicit analysis step to simulate the laser shock processing process;

[0100] Step 4.4: According to the laser shock process parameters, determine the load field and shock trajectory required for laser loading: the selected laser energy is 8J, a circular spot is used, the spot size is 1.5mm, the overlap rate is 50%, and the mesh refinement area near the joint weld and the thermomechanical affected zone is impacted once on each surface along the zigzag path;

[0101] Step 4.5: setting the residual stress field of the linear friction welding joint after stress relief annealing obtained in step 4.1 as a predefined field;

[0102] Step 4.6: Set the mesh properties and the element type to eight-node linear hexahedral element C3D8R;

[0103] Step 4.7: Submit the job and perform simulation calculations to obtain the linear friction welding joint after laser shock strengthening, so as to complete the full process simulation of linear friction welding - cutting - stress relief annealing - laser shock strengthening.

[0104] Furthermore, after the whole process simulation is completed, the surface path Path1 of the joint after cutting the flash is created, such as Figure 2 As shown. After each step, the Mises equivalent residual stress on the path is extracted, as shown Figure 3 As shown, steps 1, 2, 3, and 4 represent the linear friction welding, cutting, stress relief annealing, and laser shock strengthening steps in this embodiment.

[0105] From the description of the above embodiments, those skilled in the art can know that the present invention provides a full-process simulation method for laser shock strengthening of linear friction welding joints, which combines the linear friction welding process, the process of cutting the flash of the welding joint, the process of stress relief annealing to release the residual stress, and the laser shock strengthening process of the welding joint in a sequential order to simulate the entire process, thereby overcoming the problem that the current laser shock strengthening simulation process cannot fully introduce the residual stress of the welding joint after welding, cutting, and stress relief annealing processes, and plays a certain role in improving the accuracy of the residual stress field results of the laser shock strengthening simulation of linear friction welding joints, shortening the R&D cycle, and reducing the R&D costs.

[0106] Further, refer to Figure 4 As shown, an embodiment of the present invention further provides an electronic device, which may include a processor 10, a memory 11, a communication bus 12 and a communication interface 13, and may also include a computer program stored in the memory 11 and executable on the processor 10, and the processor executes the computer program to implement the full-process simulation method for laser shock strengthening of linear friction welding joints in the above-mentioned embodiment.

[0107] The processor 10 may be composed of an integrated circuit in some embodiments, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and combinations of various control chips. The processor 10 is the control core of the electronic device, and uses various interfaces and lines to connect various components of the entire electronic device, and executes various functions of the electronic device and processes data by running or executing programs or modules stored in the memory 11, and calling data stored in the memory 11.

[0108] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods or electronic products, etc. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0109] It should be noted that the word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention can be implemented by means of hardware comprising several distinct components, and by means of a suitably programmed computer.

[0110] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0111] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A full-process simulation method for laser shock strengthening of linear friction welding joints, characterized in that: The method comprises the following steps: Step 1: Perform finite element numerical simulation on the linear friction welding process to obtain a linear friction welding joint; Step 2: performing finite element numerical simulation of the cutting process on the obtained linear friction welding joint to obtain the linear friction welding joint after the flash cutting is completed; Step 3: performing finite element numerical simulation of a stress relief annealing process on the linear friction welding joint obtained after the flash cutting is completed, to obtain the linear friction welding joint after stress relief annealing; Step 4: Perform finite element numerical simulation of the laser shock strengthening process on the linear friction welding joint obtained after stress relief annealing to obtain the linear friction welding joint after laser shock strengthening, and complete the full process simulation of laser shock strengthening of the linear friction welding joint.

2. The full-process simulation method for laser shock strengthening of linear friction welding joints according to claim 1 is characterized in that: In this method, ABAQUS finite element software is used for finite element numerical simulation.

3. The full-process simulation method for laser shock strengthening of linear friction welding joints according to claim 2 is characterized in that: The step 1 specifically comprises the following steps: Step 1.1: Establish the three-dimensional geometric model of the two weldments and assemble them; Step 1.2: Set the material property parameters required for linear friction welding finite element numerical simulation; Step 1.3: Establish two temperature-displacement coupled dynamic explicit analysis steps to simulate the welding process and post-weld cooling process respectively; Step 1.4: Establish the contact relationship between the two weldments, including normal contact behavior, tangential contact behavior, heat conduction and heat generation conditions; Step 1.5: Set welding process parameters and boundary conditions, and apply a predefined temperature field; Step 1.6: Set the mesh properties and divide the mesh; Step 1.7: Perform simulation to obtain a linear friction welding joint.

4. The full-process simulation method for laser shock strengthening of linear friction welding joints according to claim 3 is characterized in that: The step 2 specifically comprises the following steps: Step 2.1: Export the linear friction welding joint geometry and mesh model obtained in step 1, re-divide the model mesh, and map the residual stress field to the new mesh model; Step 2.2: Establish a geometric model of the tool component and set it as a rigid body, and assemble it with the linear friction welding joint obtained in step 2.1; Step 2.3: Set the material properties for the tool and add the material parameters required for cutting simulation in the material properties of the weldment; Step 2.4: Establish a dynamic display analysis step of temperature-displacement coupling to simulate the process of tool cutting the flash of linear friction welding joint; Step 2.5: Set the contact relationship between the tool and the joint cutting path surface, including normal contact behavior and tangential contact behavior; Step 2.6: Set cutting process parameters and boundary conditions; Step 2.7: Apply a predefined temperature field and set the residual stress field in step 2.1 as a predefined field; Step 2.8: Set the mesh properties and divide the tool mesh; Step 2.9: Perform simulation to obtain the linear friction welding joint after the flash cutting is completed.

5. The full-process simulation method for laser shock strengthening of linear friction welding joints according to claim 4 is characterized in that: The step 3 specifically comprises the following steps: Step 3.1: Export the geometry and mesh model of the linear friction welding joint after the flash cutting is completed, re-divide the model mesh, and map the residual stress field to the new mesh model; Step 3.2: Set the material properties of the two weldments required for stress relief annealing simulation; Step 3.3: Establish two temperature-displacement coupled implicit analysis steps to simulate the heating and holding process and cooling process in stress relief annealing respectively; Step 3.4: Set the boundary conditions for heating and cooling required for stress relief annealing; Step 3.5: Apply a predefined temperature field and set the residual stress field in step 3.1 as a predefined field; Step 3.6: Set the grid properties; Step 3.7: Perform simulation to obtain the linear friction welding joint after stress relief annealing.

6. The full-process simulation method for laser shock strengthening of linear friction welding joints according to claim 5 is characterized in that: The step 4 specifically comprises the following steps: Step 4.1: Export the geometry and mesh model of the linear friction welding joint after stress relief annealing, re-divide the model mesh, and map the residual stress field to the new mesh model; Step 4.2: Set the material properties of the two weldments required for laser shock peening simulation; Step 4.3: Establish a dynamic explicit analysis step to simulate the laser shock processing process; Step 4.4: Determine the load field and impact trajectory required for laser loading according to the laser impact process parameters; Step 4.5: Set the residual stress field in step 4.1 as a predefined field; Step 4.6: Set the grid properties; Step 4.7: Perform simulation to obtain the linear friction welding joint after laser shock strengthening, and complete the full process simulation of linear friction welding-cutting-stress relief annealing-laser shock strengthening.

7. The full-process simulation method for laser shock strengthening of a linear friction welding joint according to claim 6 is characterized in that: In this method, the material properties involved in the full-process simulation include: density, elastic modulus, Poisson's ratio, thermal expansion coefficient, specific heat, thermal conductivity, plastic constitutive model, and shear damage parameter; among them, the plastic constitutive model adopts the Johnson-Cook constitutive model.

8. The full-process simulation method for laser shock strengthening of a linear friction welding joint according to claim 3 is characterized in that: In the step 1.1, the established three-dimensional geometric model uses two deformable body models, or considering the symmetric characteristics of the linear friction welding process, one of the weldments is replaced by a rigid body.

9. The full-process simulation method for laser shock strengthening of linear friction welding joints according to claim 4 is characterized in that: In the dynamic explicit analysis step of temperature-displacement coupling established in step 1.3 and step 2.4, ALE adaptive mesh is used for the welding interface area and the cutting surface part.

10. The full-process simulation method for laser shock strengthening of a linear friction welding joint according to claim 6, characterized in that: The meshing process is performed using Hypermesh software.

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