Full hexahedron unit encryption method based on finite element model

Abstract

The invention relates to a full hexahedron unit encryption method based on a finite element model. The method comprises the following steps of carrying out topological data reconstruction on a hexahedron unit based on the finite element model; constructing topological unit structure data for the converted units; dividing the topological unit structure data into a target unit and a peripheral unit, representing each unit by adopting unit topological structure data, and obtaining a transition unit of a hexahedron unit, wherein the target unit is a unit needing to be subdivided; and finally, updating topological data of the unit model, and repeatedly carrying out multi-stage subdivision. Compared with the prior art, the invention has the advantages of being capable of achieving unit subdivision of any scale at any position of the hexahedron unit finite element model, capable of being automatically conducted, flexible to achieve and the like.

Description

Technical field[0001]The present invention relates to the field of finite element modeling techniques, and more particularly to a full hexagonal unit encryption method based on a finite element model.Background technique[0002]In the field of fatigue crack extension analysis, the unit density of the crack tip and the cell type on the stress intensity factor calculation is huge. Under normal circumstances, the tetrahedron unit mesh can approximate the geometry of any shape, and is widely used in the field of structural finite element analysis. However, the tetrahedron unit cannot calculate shear stress, and in the case of the hexagonal unit, the number of four-sided cells is several times more than the number of six-sided units. Moreover, the hexagonal unit can introduce an additional function, and can further increase the calculation accuracy. Compared to the tetrahedral unit, the hexagonal unit is widely used in the field of fatigue crack expansion finite element analysis due to hig...

AI Technical Summary

Problems solved by technology

[0004] The hexahedral element finite element model can be generated by general finite element pre-processing software, but a common problem at present is how to locally encrypt the hexahedral element

Chinese invention patent CN103729506A proposes a method for reshaping full hexahedral elements of complex models, but this method can only encrypt swept elements, which is essentially a two-dimensional surface element encryption method, which cannot be applied to the encryption of three-dimensional hexahedral local elements with any structure , and this method is limited to use when generating finite element elements, and cannot operate on existing finite element models, and needs to use tetrahedron and pentahedron for temporary transition in the transition area, which requires a lot of manual operations and cannot be fully automated conduct

Chinese invention patent CN103116682A proposes a crack element construction method for finite element holes, which can generate and encrypt elements in the hole area, but is limited to generating tetrahedral elements

In summary, there is no local multi-level encryption method proposed for the full hexahedral unit automation unit

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