Automatic grid density generation method applicable to finite element analysis during forging process

Abstract

The invention relates to an automatic grid density generation method applicable to finite element analysis during a forging process. According to the boundary curvature, geometric property, the distribution of field variables (such as stress, strain, strain rate and temperature and the like) and requirement for the number of division units of a geometric model as well as a user-designated density window, the method is capable of automatically generating optimized and reasonable grid density distribution and a gird model, effectively controlling the number of the grid units generated eventually and combing various grid generation methods so as to generate an adaptive finite-element grid model and greatly improve the analysis efficiency and precision of numerical analysis methods such as like a finite element method. The method is applicable to the automatic gird density generation of not only 2D geometric models but also 3D geometric models. In addition, the method is applicable to not only finite-element grid density generation but also cases that initial grid division and grid re-division are needed when finite volume and finite difference are used to analyze other engineering problems.

Description

Technical field [0001] The invention relates to a finite element numerical analysis and simulation technology of a forging process, in particular to an automatic generation method of adaptive mesh density suitable for finite element analysis of the forging process. Background technique [0002] At present, the finite element method has been widely used in the numerical simulation of forging and other metal plastic forming processes. Before applying the finite element method to solve the forging forming problem, an important step is to discretize the geometric model of the analyzed forging problem (ie, mesh division). ), the discrete model becomes the finite element mesh model of the forging problem, referred to as the mesh model, which consists of a limited number of elements; forging and other metal plastic forming problems have continuous large deformations, and the shape of forgings is complex. In the numerical simulation of the forging process , The elements in the grid model...

AI Technical Summary

Problems solved by technology

Second, nonlinear large deformation processes such as forging can easily cause finite element mesh distortion, and adaptive automatic mesh re-division of the mesh must be performed frequently to ensure the normal and continuous calculation process and subsequent calculation accuracy

Users usually manually divide more nodes on the boundary with larger geometric curvature, and divide fewer nodes on the boundary with smaller geometric curvature. In this way, they try to achieve the adaptability of mesh division, but it is difficult to achieve Encrypted automation and adaptability, it is also difficult to control the number of cells in the mesh model

Images