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Abstract: In
order to meet the need of FEM analysis for plate and shell structure, a
3D solid model is output by STL file. The model’s topology relationship
is reconstructed and its surfaces are re-triangulated. On this basis
elements and surfaces are classified, and valid triangle facets are
chosen, and their thick-ness and mid-plane position are calculated.
These triangle facets are carried to their middle position so that the
mid-plane model of a plane and shell structure which is suited for FEM
analysis is formed. This method is used to the solid models of some
thin-wall structure in practice so that their mid-plane models are
extracted successfully, which shows that work and analysis time for FEM
models of a plate and shell structure can be reduced greatly.
Key words: Solid model FEM
Plane and shell model Triangle mesh
CLC No: TG312
国家自然科学基金资助项目(10590352). Received 20051213, received in revised form 20060515
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