Prediction of Initial Velocity Field for Fast Solution of Rolling Force by FEM in Strip Rolling

摘要

Finite element method (FEM) has been one of the most important numerical simulation tools with the development of computer technology. However, it is only used to simulate and analyze different process offline in many fields because of larger computational time. The initial velocity field has important influence on the computational time and iteration steps. In order to improve computational efficiency and convergence, the G function (GF), engineering method (EM) and refined mesh method (RM) for predicting initial velocity field are discussed, and a GF-RM method (GF and refined mesh) is proposed for fast calculation of rigid plasticity FEM. The velocity field, rolling force, computational time and iteration step were solved indifferent strip rolling process. The calculated results have a good agreement with the measured rolling force and the rigid plasticity FEM have higher accuracy. In spite of less iteration steps by GF, larger computational time is consumed on the solution of linear equations results in lower efficiency. In addition, more iteration steps by EM leads to larger computational time. Therefore, from the numerical results, it is found that the GF-RM method to predict initial velocity field has the remarkable advantages to reduce the computational time on the premise of guarantee the accuracy of rigid plasticity FEM, which it is better for the requirements of online application of FEM in the strip rolling process.