A structural preload simulation method for two-dimensional models

Abstract

The present invention belongs to the field of finite element simulation, and specifically relates to a structural preload simulation method for a two-dimensional model. The method comprises: selecting a straight stretch section in a two-dimensional model to which a preload is to be applied, deleting the plate element corresponding to the section, and the deleted plate element should be a regular rectangular unit; for each deleted plate element at the section, establishing a one-dimensional beam element at its axis position, and replacing the deleted plate element with the beam element; connecting and transitioning the two ends of the beam element to the plate element adjacent to the deleted plate element in the two-dimensional model; and applying a one-dimensional section preload on each beam element section.

Description

Technical Field

[0001] The invention belongs to the field of finite element simulation, and in particular relates to a structural preload simulation method for a two-dimensional model. Background Art

[0002] Finite element analysis sometimes requires simulation of the structural preload of a two-dimensional model. Current preload simulation methods are only applicable to one-dimensional or three-dimensional models, and there is a lack of preload simulation methods for two-dimensional models. Summary of the invention

[0003] The purpose of the present invention is to provide a method for simulating structural preload in a finite element model, wherein the method can simulate the preload of a two-dimensional model.

[0004] The technical solution of the present invention is:

[0005] A structural preload simulation method for a two-dimensional model, comprising:

[0006] Select the straight stretch section where the preload is to be applied in the 2D model, and delete the corresponding plate element at the section. The deleted plate element should be a regular rectangular unit.

[0007] For each deleted plate element at the cross section, a one-dimensional beam element is established at its axis position, and the deleted plate element is replaced by the beam element;

[0008] Respectively connect the two ends of the beam element with the plate elements adjacent to the deleted plate element in the two-dimensional model;

[0009] A one-dimensional section preload is applied to each beam element section.

[0010] Furthermore, the end nodes of the beam element are connected and transitioned to the common nodes of the adjacent plate element and the deleted plate element through multi-point constraint units.

[0011] Furthermore, the type of Liang Yuan is Timoshenko Liang.

[0012] Furthermore, the cross section of the beam element is the rectangular cross section of the deleted plate element.

[0013] Furthermore, the preload force is:

[0014] ;

[0015] in, For the The preload of a beam element, is the total preload of the section, For the The cross-sectional area of ​​a beam element, is the number of beam elements.

[0016] Furthermore, the straight section stretching cross section is one or a row of plate elements.

[0017] Furthermore, the method further comprises:

[0018] Based on the established new model, the preload simulation effect is verified.

[0019] A computer-readable storage medium stores computer instructions, wherein the instructions implement the above method when executed by a processor.

[0020] The advantages of the present invention are as follows: the structural preload simulation method of the present invention realizes the simulation of structural preload in a two-dimensional model, and does not affect the transmission of typical loads such as tension, bending, and shear of the two-dimensional model, making up for the deficiency that the existing structural preload simulation method is only applicable to one-dimensional or three-dimensional models. one The preload simulation is carried out by the element, which has the characteristics of easy use and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The step of applying preload force to the two-dimensional model structure of the present invention;

[0022] Figure 2 Schematic diagram of preload simulation for different 2D model structures;

[0023] Figure 3a Deformation diagram of the 2D model after applying preload;

[0024] Figure 3b Stress diagram after applying preload to the 2D model;

[0025] Figure 4 This is a deformation comparison diagram of the transition model used in this method and the original model when subjected to tensile load;

[0026] Figure 5 This is a stress comparison diagram of the transition model and the original model used in this method when subjected to tensile load;

[0027] Figure 6 This is a deformation comparison diagram of the transition model used in this method and the original model when subjected to bending and shear loads;

[0028] Figure 7 This is a stress comparison diagram of the transition model used in this method and the original model when subjected to bending and shear loads. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings. Figures 1 to 7 .

[0030] The present invention converts the plate element of the tensile section of the two-dimensional model into a Timoshenko beam element that can simulate the lateral shear behavior, and uses a flexible multi-point constraint unit for transition. Finally, the simulation of the structural preload in the two-dimensional model is achieved by applying a one-dimensional section preload on the beam element, without affecting the transmission of typical loads such as tension, bending, and shear of the two-dimensional model.

[0031] like Figure 1 As shown, the preload force simulation method includes the following steps:

[0032] The first step is to select the straight stretch section in the two-dimensional model where the preload is to be applied, and delete the plate element corresponding to the section. The deleted plate element should be a regular rectangular unit.

[0033] In the second step, for each deleted plate element at the cross section, a one-dimensional beam element is established at its axis position. The cross section of the beam element is the rectangular cross section of the deleted plate element, and the type of the beam element is a Timoshenko beam to simulate the transverse shear behavior of the plate element. For the convenience of description, the distance between the left and right two-dimensional models is enlarged in the figure;

[0034] The third step is to connect the two ends of the beam element with the corresponding plate element in the two-dimensional model using a flexible multi-point constraint unit (RBE3);

[0035] The fourth step is to apply a one-dimensional section preload on each beam element section. The magnitude of the preload is determined according to Formula 1.

[0036] (1)

[0037] in, For the The preload of a beam element, is the total preload of the section, For the The cross-sectional area of ​​a beam element, is the number of beam elements.

[0038] Figure 2 The preload simulation method described in the invention can perform preload simulation on multiple uniform or non-uniform two-dimensional units at the same time, and has the characteristics of easy use and strong adaptability.

[0039] Figure 3a and Figure 3b The simulation results of the preload force of the two-dimensional model structure obtained by this method have reasonable deformation and uniform stress, which realizes the accurate simulation of the preload force of the two-dimensional model structure.

[0040] Figure 4 and Figure 5 The transition model used in this method is completely consistent with the deformation and stress results of the original model under tensile load, which further illustrates that this method does not affect the transmission of tensile load in the two-dimensional model.

[0041] Figure 6 and Figure 7 The transition model used in this method is almost completely consistent with the deformation and stress results of the original model under bending and shear loads, which further illustrates that this method does not affect the transmission of bending and shear loads in the two-dimensional model.

Claims

1. A structural preload simulation method for a two-dimensional model, characterized in that: include: Select the straight stretch section where the preload is to be applied in the two-dimensional model, and delete the plate element corresponding to the section. The deleted plate element is a regular rectangular element. For each deleted plate element at the cross section, a one-dimensional beam element is established at its axis position, and the deleted plate element is replaced by the beam element; The two ends of the beam element are connected and transitioned to the plate elements adjacent to the deleted plate element in the two-dimensional model to obtain a new model; Apply one-dimensional section preload force to each beam element section; The preload force of a one-dimensional section is: ； in, For the The preload of a beam element, is the total preload of the section, For the The cross-sectional area of ​​a beam element, is the number of beam elements; The end nodes of the beam element are connected and transitioned with the common nodes of the adjacent plate element and the deleted plate element through the multi-point constraint unit; The straight section stretching section is one or a row of plate elements.

2. The method according to claim 1, characterized in that The type of Liang Yuan is Timoshenko Liang.

3. The method according to claim 2, characterized in that The cross section of the beam element is the rectangular cross section of the deleted plate element.

4. The method according to claim 1, characterized in that The method further comprises: Based on the established new model, the preload simulation effect is verified.

5. A computer-readable storage medium having computer instructions stored thereon, characterized in that: When the instructions are executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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