Automatic generation method for quadrilateral finite element mesh of pitting corrosion damage cylindrical shell

Abstract

The invention discloses an automatic generation method for a quadrilateral finite element mesh of a pitting corrosion damage cylindrical shell. The automatic generation method for the quadrilateral finite element mesh of the pitting corrosion damage cylindrical shell includes that carrying out parameterization set on key geometrical sizes of a pitting corrosion damage cylindrical shell model in a finite element software, constructing three standard basic segments of an end perfecting region, a pitting corrosion region and a pitting corrosion spacer region of the cylindrical shell through segregate expression, constructing the whole geometrical model of the pitting corrosion damage cylindrical shell with a multi-layer pitting corrosion region, the pitting corrosion spacer region and the end perfecting region through copying, translation and division methods, grouping the geometrical model according to pit positions and size characteristics of each region, setting the mesh division number of the region boundary of each grouping object, using mapping MAPPED and AMAP to divide the whole cylindrical shell model, and generating the whole finite element model of the quadrilateral mesh unit. The automatic generation method for the quadrilateral finite element mesh of the pitting corrosion damage cylindrical shell solves the microscopic pitting corrosion damage description problem in a macro-scale structure and improves the solving precision and solving efficiency of the simulating calculation.

Description

technical field [0001] The present invention relates to a finite element modeling method for pitting damaged cylindrical shells, more specifically, the present invention relates to a quadrilateral grid division that can be used to more accurately analyze the stress concentration and point damage caused by local damage of cylindrical shells Corrosion damage evolution and the parametric construction method of cylindrical shell model for studying the law of pitting damage affecting structural bearing capacity. Background technique [0002] Most of the legs of the pile-based platform work in a state of being eroded by the marine environment, especially in the spray splash area, which is the area where the platform structure is most severely damaged by corrosion. Corrosion will weaken the ultimate strength of components, and the influence of local damage such as pitting and grooves on the strength of components is more complicated. Usually, for the convenience of processing, such...

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for automatically generating quadrilateral finite element meshes of cylindrical shells with pitting damage, improve the meshing quality of finite element models of cylindrical shells with local damage, thereby solve the problem of describing physical models of different scales, and improve the simulation performance. Computational solution accuracy and efficiency

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