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Global-Local detail finite element method based on force method

An analysis method and finite element technology, applied in the field of finite element analysis, can solve problems such as low efficiency, inability to interpolate rotational displacement, and inability to ensure consistent displacement field, etc., to achieve the effect of improving efficiency and easy programming

Active Publication Date: 2014-10-29
CHENGDU AIRCRAFT DESIGN INST OF AVIATION IND CORP OF CHINA
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Problems solved by technology

[0005] a) Displacement field interpolation can only be used for translational displacement, and rotational displacement cannot be interpolated;
[0006] b) The displacement fields generated by 1D and 2D units cannot be applied to 3D units, and the transition is done manually, which is extremely inefficient;
[0007] c) The displacement field obtained by interpolation of the overall model node displacement cannot guarantee that the load on the analyzed detail structure is consistent with the actual load

Method used

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  • Global-Local detail finite element method based on force method
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  • Global-Local detail finite element method based on force method

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Embodiment Construction

[0053] The Global-Local detail finite element analysis method based on the force method of the present invention is based on the analysis results of the overall finite element model, and the internal force of the boundary nodes of the detail analysis area boundary in the overall finite element model is used as the force boundary condition of the detail analysis model to perform detailed analysis. analyze. The detail model only needs to correspond to the structure of the overall model, and a sufficient transition area (1.5 to 2 times the grid size of the overall model) is ensured when selecting the detail analysis range to ensure the stress analysis accuracy of the details concerned.

[0054] The specific steps of the present invention will be described in detail below in conjunction with specific examples. The simplest example is chosen for the convenience of method description. The instance is as figure 2 The center-opening cantilever beam structure shown. Its specific pa...

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Abstract

The invention belongs to the finite element analysis technique and relates to a method for achieving Global-Local structure detail stress analysis efficiently, quickly and accurately according to an overall structural analysis result. According to the Global-Local detail finite element method based on the force method, structural internal force on the boundary of an area, needing detail analysis, in an overall model is obtained to serve as the external force boundary condition for a model for detail analysis conducted separately later, and then detail analysis is conducted. Compared with a traditional method with displacement as the boundary, the method has the advantages of being efficient, quick and accurate.

Description

technical field [0001] The invention belongs to finite element analysis technology, and relates to an efficient, fast and accurate method for completing local structural detail stress analysis (Global-Local) according to the overall structural analysis results. Background technique [0002] Details determine success or failure, especially in structural anti-fatigue design. At this stage, detailed finite element stress analysis has become the main means of anti-fatigue design. The detailed analysis of complex structures, especially aircraft structures, is often done by using large-scale voxels while considering nonlinear factors such as geometry, materials, and boundary conditions. This kind of detailed analysis is usually impossible and unnecessary to be completed in the overall analysis model due to the limitations of the model size and the solving function of the finite element solver, and the detailed analysis model is usually established separately to complete it. [0...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王凡叶建飞
Owner CHENGDU AIRCRAFT DESIGN INST OF AVIATION IND CORP OF CHINA
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