Abaqus grid division method based on Midas modeling and Matlab conversion
A grid division and grid technology, which is applied in the field of geotechnical engineering simulation and simulation research, can solve problems such as unknown calculation errors and software instability, so as to improve the accuracy and efficiency of numerical calculation, and improve the quality of grid and analysis accuracy. , the effect of saving energy
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Embodiment 1
[0030] As a general-purpose large-scale finite element software, Abaqus is widely used in geotechnical engineering, but it is prone to phenomena such as free edges, short edges, small planes, or contact surface mesh uncoupling during mesh division, which terminates the calculation or affects the calculation efficiency. ; and Midas software, as a practical engineering finite element software, has a friendly interface and is easy to use, and the meshing process is simple, but its calculation is not stable, and it often does not converge when dealing with complex nonlinear engineering problems. In order to solve the problem of difficult grid division and coupling of Abaqus software, Midas software is not universal enough to deal with complex nonlinear problems. Combining the advantages and disadvantages of the two softwares, the grid divided by Midas software is imported into Abaqus for finite element calculation, which can fully Learn from each other.
[0031]The present inventi...
Embodiment 2
[0040] Based on Matlab, the complex finite element grid generated by Midas is constructed into an Abaqus grid information INP file, and the joint modeling method that can test grid parameters mainly includes Midas numerical modeling, Matlab model file conversion, and Abaqus grid information INP import calculation. .
[0041] The numerical modeling described in this program is based on the application of finite element software Midas, which generally generates grids in two ways: 2D or 3D. It provides user-friendly operations such as preview and undo for grid elements, which greatly improves the modeling speed. Reduce the chance of mesh errors. A grid with high quality and reasonable distribution can be obtained through fewer operation steps. By distributing seeds on the geometric lines that need to be subdivided and encrypted, users can according to different types of distribution, including unit length, number, linear gradient , hyperbolic tangent or custom methods to select ...
Embodiment 3
[0045] According to the implementation steps described in embodiment 1, the present invention utilizes Matlab self-contained function to compile, and realizes the extraction, identification and conversion of the Midas slope stability analysis example numerical model grid parameter (unit form, node form) format, will have The unit and node information are respectively converted into data forms that can be recognized and read by Abaqus INP files, and a new grid INP text file is generated.
[0046] The first step is to establish the slope stability 3D wireframe and solid elements through the built-in wireframe toolbox of Midas, and carry out meshing of the 3D model through the built-in tetrahedral mesh toolbox, as shown in Fig. 3(a). After completing the grid division, the second step is to save the table (node table, element table) parameters in the menu as node.txt and element.txt format for Matlab to read and call, open Abaqus software to import node and element information, ...
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