A method for predicting the compressive bearing performance of integrally formed stiffened panels

Abstract

The present invention discloses a method for predicting the compressive bearing performance of an integrally formed reinforced wall panel. The method first performs an integral forming simulation on the reinforced wall panel, and then reconstructs and establishes a compressive bearing simulation model of the reinforced wall panel according to the deformation of the wall panel components after forming, and imports the simulated calculated values ​​of the residual stress and mechanical property distribution of the wall panel components after forming into the compressive bearing simulation model of the reinforced wall panel as initial conditions. Finally, the compressive bearing simulation model is analyzed to obtain the predicted results of the compressive bearing performance of the reinforced wall panel. The method comprehensively considers the influence of the residual stress, actual deformation and uneven performance of the material after the reinforced wall panel adopts the integral forming process on the subsequent structural bearing capacity, thereby improving the prediction accuracy of the compressive bearing performance of the integrally formed reinforced wall panel, greatly saving the cost of physical experiments, and providing a theoretical basis for the structural optimization design of the reinforced wall panel, which is of great significance to improving design efficiency and shortening design cycle.

Description

Technical Field

[0001] The invention relates to the technical field of aviation structure design, and in particular to a method for predicting the compressive bearing performance of an integrally formed stiffened wall panel. Background Art

[0002] Aluminum alloy stiffened panels are important load-bearing structures of aircraft. They are mainly subjected to axial compression, shear or combined stress states of compression and shear during the service of aircraft. Therefore, it is very important to calculate and evaluate the instability buckling and even failure loads of stiffened panels. Although there are relatively mature analytical or simulation calculation methods for the buckling characteristics of stiffened panels in engineering, the objects of calculation are generally stiffened panels with perfect shape, uniform performance and no internal stress. However, for actual stiffened panels, the typical integral forming manufacturing processes are shot peening and aging forming. Among them, the residual stress of shot peening has a greater influence on the structural performance. Studies have pointed out that the critical value and failure value of compression buckling of profiles after shot peening are reduced, while aging forming will affect the size and distribution of the static strength value of the structure. Therefore, due to the complexity of the integral forming process, it has a significant impact on the performance and residual stress of the reinforced wall panels, resulting in the actual reinforced wall panels not being perfect in shape, uniform in performance and free of internal stress. If the current method is used to calculate and predict the compressive bearing performance of the integrally formed reinforced wall panels, large deviations will occur, making it difficult to accurately guide the actual bearing capacity test of the reinforced wall panels and the design improvement of the structure. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method for predicting the compressive bearing performance of integrally formed stiffened wall panels, which can take into account the influence of the integral forming process on the compressive bearing performance of the aluminum alloy stiffened wall panels and improve the prediction accuracy.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A method for predicting the compressive bearing performance of an integrally formed stiffened wall panel comprises the following steps:

[0005] Step S100, performing an overall forming simulation on the reinforced wall panel to obtain simulation calculation values ​​of deformation, residual stress and mechanical property distribution of the wall panel component after forming;

[0006] Step S200, reconstructing a finite element model of the reinforced wall panel according to the deformation of the wall panel component after forming, and establishing a compression bearing simulation model of the reinforced wall panel;

[0007] Step S300, the simulation calculated values ​​of residual stress and mechanical property distribution of the formed wall panel component are imported as initial conditions into the compression bearing simulation model of the reinforced wall panel;

[0008] Step S400, performing nonlinear buckling analysis on the compression bearing simulation model of the stiffened wall panel to obtain a calculation result file;

[0009] Step S500, extracting the load and displacement calculation results from the calculation result file, obtaining the load-displacement curve of the load application point during the nonlinear buckling analysis, and then obtaining the compressive bearing performance of the integrally formed stiffened wall panel.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. This method first simulates the integral forming of the reinforced wall panel, then establishes a compression bearing simulation model of the reinforced wall panel according to the deformation of the wall panel components after forming, and imports the simulation calculation values ​​of the residual stress and mechanical property distribution of the wall panel components after forming into the compression bearing simulation model of the reinforced wall panel as initial conditions, and finally analyzes the compression bearing simulation model to obtain the prediction results. The influence of the residual stress, actual deformation and uneven performance of the material after the integral forming process of the reinforced wall panel on the subsequent structural bearing capacity is fully considered, thereby improving the prediction accuracy of the compression bearing performance of the integrally formed reinforced wall panel;

[0012] 2. This method establishes a "whole forming-compression bearing" joint simulation model of the reinforced wall panel, and can directly predict the forming effect and bearing capacity of the reinforced wall panel through the finite element simulation method, which greatly saves the cost of physical experiments;

[0013] 3. The present invention can compare the overall forming schemes and bearing capacities of reinforced wall panels of different structures, providing a theoretical basis for the structural optimization design of reinforced wall panels, which is of great significance for improving design efficiency and shortening design cycle.

[0014] In the above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, in step S100, an integral forming simulation is performed on the stiffened wall panel based on finite element simulation software, and the integral forming simulation is an aging forming simulation.

[0015] The above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, step S100 comprises the following steps:

[0016] Step S110, establishing a finite element model of the stiffened wall panel;

[0017] Step S120, based on the aging forming finite element model of step S110, combined with the aging forming macro-micro constitutive model of aluminum alloy, the whole aging forming process of the reinforced wall panel is simulated to obtain the springback and yield strength distribution of the reinforced wall panel after forming;

[0018] Step S130, based on the springback and yield strength distribution of the stiffened wall panels after forming in step S120, extract the displacement, stress state and mechanical property characteristic values ​​of the nodes of the stiffened wall panels model after forming, and export the file to obtain the simulation calculation values ​​of the deformation, residual stress and mechanical property distribution of the wall panel components after forming.

[0019] In the above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, in step S120, the aging forming macro-micro constitutive model of the aluminum alloy is a mathematical model that can describe the inelastic deformation and yield strength evolution of the aluminum alloy material over time during the aging forming process.

[0020] In the above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, in step S120, the whole aging forming process of the stiffened wall panel is simulated, including the loading, heating, insulation, cooling and unloading stages of the stiffened wall panel, as well as the required key forming process parameters.

[0021] The above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, step S200 comprises the following steps:

[0022] Step S210, adding the displacement of the node of the stiffened wall panel model after forming in step S130 to the coordinate value of the node before forming, to obtain the node coordinate value of the stiffened wall panel after forming;

[0023] Step S220, re-importing the node coordinate values ​​of the formed reinforced wall panel obtained in step S210 into the finite element software, reconstructing the reinforced wall panel finite element model, and obtaining a reinforced curved plate model for compression bearing simulation;

[0024] Step S230: setting boundary conditions for compression load simulation and establishing a compression load simulation model for the stiffened wall panel.

[0025] In the above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, in step S230, setting the boundary conditions for the compressive bearing simulation includes the following steps: one end of the stiffened wall panel is fully displaced, and the other end is constrained to be displaced except for the loading direction, and a displacement loading condition is applied.

[0026] In the above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, in step S300, the predicted results of the residual stress and mechanical property distribution of the wall panel component after forming are re-imported into the stiffened wall panel compression bearing simulation model as initial conditions through a user subroutine. The subroutine has the function of constructing a corresponding stress-strain relationship according to the characteristic values ​​of the mechanical properties. The unified Ec value and n value, as well as the mechanical property characteristic values ​​of the corresponding nodes can be substituted into the Ramberg-Osgood formula to construct a stress-strain relationship.

[0027] The above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, step S400 comprises the following steps:

[0028] Step S410, performing linear buckling solution to obtain the first several buckling modes of the stiffened wall panel after forming;

[0029] Step S420, taking the displacement field of the mode in step S410 and multiplying it by the defect coefficient and introducing it into the compression bearing simulation model as the initial disturbance;

[0030] Step S430: Perform nonlinear buckling analysis on the formed stiffened wall panel model to obtain a calculation result file.

[0031] The above-mentioned method for predicting the compressive bearing performance of the integrally formed stiffened wall panel, step S500 comprises the following steps:

[0032] Step S510, extracting the load and displacement data of the loading point, drawing the load-displacement curve of the loading point, and obtaining the ultimate load of the age-formed stiffened wall panel;

[0033] Step S520, extracting the load and strain data of the characteristic position of the test area of ​​the age-formed stiffened wall panel, drawing the load-strain curve of the characteristic position of the test area, and obtaining the buckling characteristics and failure process of the age-formed stiffened wall panel.

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a flow chart of a method according to an embodiment of the present invention;

[0036] Figure 2 is a cross-sectional view of a stiffened wall panel test piece according to an embodiment of the present invention;

[0037] Figure 3 The springback simulation result of the stiffened wall panel test piece of the embodiment of the present invention is shown in FIG.

[0038] Figure 4 This is a comparison diagram of the buckling strength results of the stiffened wall panel test piece after forming simulation and before compression load simulation according to an embodiment of the present invention, wherein: Figure 4 (a) is a schematic diagram of the yield strength of the stiffened panel specimen after forming simulation. Figure 4 (b) is a schematic diagram of the yield strength of the stiffened panel specimen before compression load simulation;

[0039] Figure 5 This is a simulation result diagram of the stiffened wall panel test piece after compression buckling according to an embodiment of the present invention;

[0040] Figure 6A comparison diagram of load-displacement curves of simulation and test of the compression bearing end of the stiffened wall panel test piece according to an embodiment of the present invention;

[0041] Figure 7 The load-displacement curve comparison diagram of the simulation and test of the characteristic points of the test area of ​​the stiffened wall panel test piece according to the embodiment of the present invention, wherein: Figure 7 (a) is a comparison of the load-strain curves of the simulation and test of the skin feature points. Figure 7 (b) Comparison of the load-strain curves of the simulation and test of the rib feature points. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below. Figures 1 to 7 The embodiment of the present invention provides a method for predicting the compressive bearing performance of an integrally formed stiffened wall panel. In this embodiment, the stiffened wall panel is an aluminum alloy plate. Figure 1 , the method of this embodiment includes the following steps:

[0043] Step S100, performing an overall forming simulation on the reinforced wall panel to obtain simulation calculation values ​​of deformation, residual stress and mechanical property distribution of the wall panel component after forming;

[0044] Step S200, reconstructing a finite element model of the reinforced wall panel according to the deformation of the wall panel component after forming, and establishing a compression bearing simulation model of the reinforced wall panel;

[0045] Step S300, the simulation calculated values ​​of residual stress and mechanical property distribution of the formed wall panel component are imported as initial conditions into the compression bearing simulation model of the reinforced wall panel;

[0046] Step S400, performing nonlinear buckling analysis on the compression bearing simulation model of the stiffened wall panel to obtain a calculation result file;

[0047] Step S500, extracting the load and displacement calculation results from the calculation result file, obtaining the load-displacement curve of the load application point during the nonlinear buckling analysis, and then obtaining the compressive bearing performance of the integrally formed stiffened wall panel.

[0048] Compared with the prior art, this method first simulates the integral forming of the reinforced wall panel, then establishes a compression bearing simulation model of the reinforced wall panel according to the deformation of the wall panel components after forming, and imports the simulation calculation values ​​of the residual stress and mechanical property distribution of the wall panel components after forming into the compression bearing simulation model of the reinforced wall panel as initial conditions, and finally analyzes the compression bearing simulation model to obtain the prediction results. The influence of the residual stress, actual deformation and uneven performance of the material after the integral forming process of the reinforced wall panel on the subsequent structural bearing capacity is fully considered, thereby improving the prediction accuracy of the compression bearing performance of the integrally formed reinforced wall panel. By establishing a "integral forming-compression bearing" joint simulation model of the reinforced wall panel, this method can directly predict the forming effect and bearing capacity of the reinforced wall panel through the finite element simulation method, which greatly saves the cost of physical experiments. The present invention can compare the overall forming schemes and bearing capacities of reinforced wall panels of different structures, provide a theoretical basis for the structural optimization design of the reinforced wall panel, and is of great significance to improving design efficiency and shortening design cycle.

[0049] Furthermore, in step S100, the overall forming simulation is an aging forming simulation. Specifically, the finite element simulation software ABAQUS can be used to perform an aging forming simulation on the reinforced wall panel, so as to obtain the simulation calculation values ​​of the deformation, residual stress and mechanical property distribution of the wall panel component after forming.

[0050] More specifically, step S100 includes the following steps:

[0051] Step S100: Based on the finite element simulation software ABAQUS, the stiffened wall panel is simulated for aging forming to obtain the simulation calculation values ​​of the deformation, residual stress and mechanical property distribution of the wall panel component after forming, specifically:

[0052] Step S110, establishing a finite element model of the stiffened wall panel: Figure 2 The cross-sectional dimensions of the specimen were used to establish a three-dimensional mesh model of the stiffened panel test piece, in which the meshes of the skin and the long stringer model both adopted C3D20R solid mesh units, the material was 7B50-T651, the mold surface was set to a rigid body, and the radius was 480 mm.

[0053] Step S120, according to the aging forming finite element model of step S110, combined with the aging forming macro-micro constitutive model of aluminum alloy, the whole aging forming process of the reinforced wall panel is simulated to obtain the springback and yield strength distribution of the reinforced wall panel after forming: wherein, the aging forming macro-micro constitutive model of aluminum alloy is: including a mathematical model that can describe the evolution of the inelastic deformation and yield strength of the aluminum alloy material over time during the aging forming process through means such as uniaxial creep aging / stress relaxation aging experiments, mechanical properties tests and microstructure characterization. The whole aging forming process simulation includes the loading, heating, insulation, cooling and unloading stages of the reinforced wall panel, as well as the required key forming process parameters. Specifically, the CREEP subroutine in the finite element software ABAQUS is used to simulate the whole aging forming process of the reinforced wall panel, predict the deformation and performance evolution of the component, and obtain the springback and yield strength distribution of the reinforced wall panel after forming, as shown in the attached figure. Figure 3 and attached Figure 4 In order to verify the validity of the finite element simulation results, this embodiment carried out a corresponding stiffened wall panel aging forming test, and the measured radius of the stiffened wall panel after rebound was 1400mm, while Figure 3 and attached Figure 4 The simulation prediction result shown in (a) is 1432 mm with an error of 2.3%, which proves the effectiveness of the finite element simulation results.

[0054] Step S130, according to the springback and yield strength distribution of the stiffened wall panel after forming obtained in step S120, the displacement, stress state and mechanical property characteristic values ​​of the nodes of the stiffened wall panel model after forming are extracted: in the software post-processing module, the model node displacement, stress state and mechanical property characteristic values ​​in the forming constitutive structure are arranged by node number and exported to a file. Specifically, the displacement of each node of the model (△x n , △y n , △z n , n is the node number) and yield strength value, and the stress state of the model node is exported in ".odb" format. This can obtain the simulation calculation values ​​of the deformation, residual stress and mechanical property distribution of the wall panel component after forming.

[0055] More specifically, step S200 includes the following steps:

[0056] Step S200: Reconstruct the finite element model of the reinforced wall panel according to the deformation of the wall panel component after forming, and establish the compression bearing simulation model of the reinforced wall panel:

[0057] Step S210, adding the displacement of the nodes of the stiffened panel model after forming to the coordinate values ​​of the nodes before forming, to obtain the node coordinate values ​​of the stiffened panel after forming: Specifically, exporting the ".inp" file of the aging forming simulation model, extracting the original coordinates (x n ,y n , z n ), that is, the coordinate value of the node before forming, and the original coordinates are compared with the node displacement (△x n , △y n , △z n ) are added to obtain the node coordinates of the reinforced panel model after forming: (x' n , y' n , z' n );

[0058] Step S220, re-import the node coordinate values ​​of the formed stiffened wall panel obtained in step S210 into the finite element software, reconstruct the stiffened wall panel finite element model, and obtain the stiffened curved plate model for compression bearing simulation: specifically, the node coordinates (x' n , y' n , z' n ), in order to update the node coordinates of the original ".inp" file, a new finite element model of the reinforced wall panel containing the forming results is constructed, that is, a reinforced curved plate model for compression bearing simulation;

[0059] Step S230, according to the situation of the compression bearing test, set the boundary conditions of the compression bearing simulation for the reinforced curved plate model: one end of the reinforced wall panel is fully displaced, and the other end is constrained for displacement except for the loading direction, and the displacement loading condition is applied. Specifically, displacement constraints in the x, y, and z directions are set at one end of the reinforced wall panel (fixed end), and displacement constraints in the x and y directions are set at the other end (loading end), where z is the loading direction without constraint, and a reference point is set at each of the fixed end and the loading end, and Tie connections are made to the two end faces of the wall panel respectively. After the above steps S210-S230, the compression bearing simulation model of the reinforced wall panel is finally established.

[0060] Furthermore, in step S300, the residual stress and mechanical property distribution prediction results of the formed wall panel component are re-imported into the stiffened wall panel compression bearing simulation model as initial conditions through the user subroutine. Specifically, the node yield strength value derived in step S130 is extracted using the UMAT subroutine function of ABAQUS, and the stress-strain relationship is established according to the Ramberg-Osgood formula, wherein the Ramberg-Osgood formula is as follows:

[0061]

[0062] in, For strain, is stress, and n are the compression modulus and RO coefficient of the material, which are 73777MPa and 17 respectively according to the material manual. is the material yield strength, and the uniform The value and n value, as well as the node yield strength value derived in step S130, are substituted into the Ramberg-Osgood formula to establish a separate material stress-strain relationship for each node. Specifically, after the yield strength value is imported into the new model, Figure 4 (b) shows, compared with Figure 4 (a) and Figure 4 (b) It can be seen that the yield strength distribution of the component before compression bearing simulation is consistent with that after forming, indicating that the yield strength has been successfully imported into the new model. Afterwards, select PredefinedField in the Load menu of the compression bearing simulation model to set the initial stress field for the model, and select the ".odb file" of the node stress state of the model after forming saved in step S130 as the database file, and the residual stress state and mechanical property distribution of the stiffened wall panel after forming can be imported into the compression bearing simulation model.

[0063] Further, step S400 includes the following steps:

[0064] Step S400: Perform nonlinear buckling analysis on the compression bearing simulation model of the stiffened wall panel to obtain a calculation result file, specifically:

[0065] Step S410, perform linear buckling solution to obtain the first few buckling modes of the stiffened wall panel after forming: the linear buckling solution can be performed using the finite element analysis software solver, and the linear buckling solution is to solve at least the first-order buckling mode. In this embodiment, the Buckle method of the ABAQUS finite element software is first used to perform a linear buckling solution on the compression bearing simulation model of the stiffened wall panel to obtain the first 5 buckling modes and eigenvalues ​​of the stiffened wall panel after forming, and then the displacement field of the first-order buckling mode is output in the form of nodefileU.

[0066] Step S420, take the displacement field of the mode in step S410 and multiply it by the coefficient and introduce it into the compression bearing simulation model as the initial disturbance: In the nonlinear buckling calculation model of the stiffened wall panel, multiply the displacement field obtained in step S410 by the defect coefficient to obtain the defect offset, and apply forced node displacement by compiling a ".inp" file to introduce geometric defects. Specifically, in the nonlinear buckling simulation, by adding an imperfection statement in the ".inp" file, the displacement field obtained in step S410 is multiplied by the coefficient and reintroduced into the compression bearing simulation model as the initial defect.

[0067] Step S430, using a subroutine to perform nonlinear buckling analysis on the stiffened panel model after forming, and obtain a calculation result file: Specifically, calling the UMAT subroutine in step S300, performing nonlinear buckling calculation on the stiffened panel model containing material / geometric nonlinear characteristics and forming result information, performing compression simulation calculation on the formed stiffened panel considering geometric defect nonlinearity and independent stress-strain nonlinear constitutive law of each node, and obtaining the morphology of the stiffened panel after buckling and the calculation result file, wherein the calculated panel buckling morphology is as shown in the attached figure. Figure 5 In order to verify the validity of the compression bearing simulation results, this embodiment carried out a compression bearing test on the corresponding stiffened wall panel test piece after forming, and found that the buckling morphology of the test piece was similar to that of the simulation model, thereby proving the validity of the compression bearing simulation results.

[0068] Further, step S500 includes the following steps:

[0069] Step S500: extract the load and displacement calculation results from the calculation result file, obtain the load-displacement curve of the load application point during the nonlinear buckling analysis, and then obtain the compressive limit bearing capacity of the integrally formed stiffened wall panel. Specifically:

[0070] Step S510, extract the load and displacement data of the loading point, draw the load-displacement curve of the loading point, and obtain the ultimate load of the aging formed stiffened wall panel: from the calculation result file of step S430, extract the load of the stiffened wall panel fixed end reference point, the load of the loading end reference point, and the displacement of the loading end reference point, and draw the load-displacement curve of the loading point in the Origin software as shown in the attached figure. Figure 6 As shown in the figure, the extreme point of the curve is the ultimate compression bearing capacity of the aging formed stiffened wall panel. The corresponding compression bearing test results are also plotted in the attached figure. Figure 6 By comparing the results in Figure 2, it can be seen that the relative error between the two is less than 5%, which proves that the simulation results are in good agreement with the experimental results.

[0071] Step S520, extract the load and strain data of the characteristic position of the test area of ​​the aging formed stiffened wall panel, draw the load-strain curve of the characteristic position of the test area, and obtain the buckling characteristics and failure process of the aging formed stiffened wall panel: from the calculation result file of step S430, extract the load of the reference point of the fixed end of the stiffened wall panel, the load of the characteristic position of the test area, and the strain of the characteristic position of the test area, and draw the load-strain curve in the Origin software as shown in the attached figure. Figure 7 The corresponding load-strain curves for the compression bearing test are also plotted in the attached figure. Figure 7 Among them, Figure 7 (a) is a comparison of the load-strain curves of the simulation and test of the skin feature points. Figure 7 (b) is a comparison of the load-strain curves of the simulation and test of the rib feature points. It can be seen that the simulation results are in good agreement with the test results, indicating that the buckling characteristics and failure processes of the two are similar. The above comparison proves the effectiveness and reliability of the compression bearing simulation of the aging formed stiffened wall panel.

[0072] It should be noted that in the description of the present invention, if there are any orientation descriptions, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are all based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0073] In the description of the present invention, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0074] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0075] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A method for predicting the compressive bearing performance of an integrally formed stiffened wall panel, characterized in that: The steps include: Step S100, performing an overall forming simulation on the reinforced wall panel to obtain simulation calculation values ​​of deformation, residual stress and mechanical property distribution of the wall panel component after forming; Step S200, reconstructing a finite element model of the reinforced wall panel according to the deformation of the wall panel component after forming, and establishing a compression bearing simulation model of the reinforced wall panel; Step S300, the simulation calculated values ​​of residual stress and mechanical property distribution of the formed wall panel component are imported as initial conditions into the compression bearing simulation model of the reinforced wall panel; Step S400, performing nonlinear buckling analysis on the compression bearing simulation model of the stiffened wall panel to obtain a calculation result file; Step S500, extracting the load and displacement calculation results from the calculation result file, obtaining the load-displacement curve of the load application point during the nonlinear buckling analysis process, and then obtaining the compressive bearing performance of the integrally formed stiffened wall panel; Wherein, in step S100, the stiffened wall panel is subjected to an overall forming simulation based on finite element simulation software, wherein the overall forming simulation is an aging forming simulation, and step S100 includes the following steps: Step S110, establishing a finite element model of the stiffened wall panel; Step S120, based on the aging forming finite element model of step S110, combined with the aging forming macro-micro constitutive model of aluminum alloy, the whole aging forming process of the reinforced wall panel is simulated to obtain the springback and yield strength distribution of the reinforced wall panel after forming; Step S130, based on the springback and yield strength distribution of the stiffened wall panels after forming in step S120, extract the displacement, stress state and mechanical property characteristic values ​​of the nodes of the stiffened wall panels model after forming, and export the file to obtain the simulation calculation values ​​of the deformation, residual stress and mechanical property distribution of the wall panel components after forming.

2. The method for predicting the compressive bearing performance of the integrally formed stiffened wall panel according to claim 1, characterized in that: In step S120, the aging forming macro-micro constitutive model of the aluminum alloy is a mathematical model that can describe the evolution of the inelastic deformation and yield strength of the aluminum alloy material over time during the aging forming process.

3. The method for predicting the compressive bearing performance of the integrally formed stiffened wall panel according to claim 1, characterized in that: In step S120, the whole aging forming process simulation of the stiffened wall panel includes the loading, heating, insulation, cooling and unloading stages of the stiffened wall panel, as well as the required key forming process parameters.

4. The method for predicting the compressive bearing performance of the integrally formed stiffened wall panel according to claim 1, characterized in that: Step S200 includes the following steps: Step S210, adding the displacement of the node of the stiffened wall panel model after forming in step S130 to the coordinate value of the node before forming, to obtain the node coordinate value of the stiffened wall panel after forming; Step S220, re-importing the node coordinate values ​​of the formed reinforced wall panel obtained in step S210 into the finite element software, reconstructing the reinforced wall panel finite element model, and obtaining a reinforced curved plate model for compression bearing simulation; Step S230: setting boundary conditions for compression load simulation and establishing a compression load simulation model for the stiffened wall panel.

5. The method for predicting the compressive bearing performance of the integrally formed stiffened wall panel according to claim 4, characterized in that: In step S230, setting the boundary conditions for compression bearing simulation includes the following steps: full displacement constraint is applied to one end of the stiffened wall panel, displacement constraint is applied to the other end except for the loading direction, and displacement loading conditions are applied.

6. The method for predicting the compressive bearing performance of the integrally formed stiffened wall panel according to claim 1, characterized in that: In step S300, the residual stress and mechanical property distribution prediction results of the formed wall panel component are re-imported as initial conditions into the stiffened wall panel compression bearing simulation model through a user subroutine, and the subroutine has the function of constructing a corresponding stress-strain relationship according to the mechanical property characteristic value, and the unified Ec value and n value, as well as the mechanical property characteristic value of the corresponding node are substituted into the Ramberg-Osgood formula to construct the stress-strain relationship; Among them, the Ramberg-Osgood formula is as follows: ； In the Ramberg-Osgood formula, For strain, is stress, and n are the material compression modulus and RO coefficient respectively, is the node yield strength value derived in step S130.

7. The method for predicting the compressive bearing performance of the integrally formed stiffened wall panel according to claim 1, characterized in that: Step S400 includes the following steps: Step S410, performing linear buckling solution to obtain the first several buckling modes of the stiffened wall panel after forming; Step S420, taking the displacement field of the mode in step S410 and multiplying it by the defect coefficient and introducing it into the compression bearing simulation model as the initial disturbance; Step S430: Perform nonlinear buckling analysis on the formed stiffened wall panel model to obtain a calculation result file.

8. The method for predicting the compressive bearing performance of the integrally formed stiffened wall panel according to claim 1, characterized in that: Step S500 includes the following steps: Step S510, extracting the load and displacement data of the loading point, drawing the load-displacement curve of the loading point, and obtaining the ultimate load of the age-formed stiffened wall panel; Step S520, extracting the load and strain data of the characteristic position of the test area of ​​the age-formed stiffened wall panel, drawing the load-strain curve of the characteristic position of the test area, and obtaining the buckling characteristics and failure process of the age-formed stiffened wall panel.

Images