A method for automatically generating quadrilateral finite element meshes for pitting damaged cylindrical shells

Abstract

The invention discloses a method for automatically generating a quadrilateral finite element grid of a pitting damaged cylindrical shell. In the finite element software, the key geometric dimensions of the pitting damaged cylindrical shell model are parameterized, and the cylindrical shell is constructed through segmental expression. The three standard basic segments of end perfect area, pitting area and pitting spacer, use the method of copy, translation and segmentation to construct the whole point including multi-layer pitting area, pitting spacer and end perfecting area For the geometric model of the corroded cylindrical shell, the geometric model is grouped according to the position of the pit and the size characteristics of each partition, and the number of grid divisions for the boundary of each grouped object area is set, and the overall model of the cylindrical shell is divided by mapping MAPPED and AMAP, and finally a quadrilateral is generated The overall finite element model of the grid unit solves the problem of fine pitting damage description in the macro-scale structure, and improves the solution accuracy and efficiency of the simulation 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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