An ALE hydrodynamic lubrication finite element method with application to strip rolling

1993 ◽  
Vol 36 (5) ◽  
pp. 855-880 ◽  
Author(s):  
Yu-Kan Hu ◽  
Wing Kam Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Hydrodynamic Lubrication ◽  
Strip Rolling ◽  
Element Method

A fast rigid-plastic finite element method for online application in strip rolling

2010 ◽  
Vol 46 (12) ◽  
pp. 1146-1154 ◽  
Author(s):  
S.H. Zhang ◽  
G.L. Zhang ◽  
J.S. Liu ◽  
C.S. Li ◽  
R.B. Mei
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strip Rolling ◽  
Rigid Plastic ◽  
Online Application ◽  
Element Method

Solution of Singularity Points in Strip Rolling by Rigid Plasticity Finite Element Method

2010 ◽  
Vol 97-101 ◽  
pp. 219-226
Author(s):  
Chang Sheng Li ◽  
Rui Bin Mei ◽  
Xiang Hua Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Slip Velocity ◽  
Velocity Model ◽  
Iteration Step ◽  
Parabolic Model ◽  
Strip Rolling ◽  
Relative Slip ◽  
Singularity Point ◽  
Element Method

The concept of the first and the second singularity point was introduced in the paper. The singularity points would lead to the iteration divergence in the solution of rolling by rigid plasticity finite element method. Double velocity model and parabolic model of relative slip velocity were proposed for solution of the first and the second singularity point respectively. The influence of the models to improve the effects of singularity point on calculating time and iteration step was discussed according to the practical strip rolling condition. The results showed that for the element numbers from 200 to 2000, the iteration step and total calculating time was reduced about 8~67% by the double velocity model in the same condition compared to normal model for the solution of first singularity point. The iteration step and calculating time was reduced about 15~61% with the parabolic model of relative slip velocity. The double velocity model and parabolic model of relative slip velocity could be used to improve the convergence and increase efficiency of the solution in strip rolling by rigid plasticity finite element method.

An analysis of the symmetric rolling of aluminium strips using a three-dimensional elastic—plastic large deformation finite element method

1994 ◽  
Vol 29 (4) ◽  
pp. 267-276 ◽  
Author(s):  
Z C Lin ◽  
C J Huang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Large Deformation ◽  
Rolling Force ◽  
Large Strain ◽  
Three Dimensional ◽  
Analysis Model ◽  
Strip Rolling ◽  
Elastic Plastic ◽  
Element Method

This study focuses on the deformation which occurs in three-dimensional elastic-plastic aluminium strips when they undergo symmetric rolling with a rigid body roller. This research is based on the theory of large deformation and large strain, using the updated Lagrangian formulation (ULF) and the incremental method to develop the analysis model of the three-dimensional elastic-plastic characteristic of aluminium strip rolling. As for the determination of the direction of tangential friction force, this study also develops a modification algorithm to adjust to the three-dimensional rolling process. In addition, another rule is devised to identify the neutral point in order to further develop the theoretical model and computer program for the large deformation finite element method with the two-order strain rate equation. Finally, this study uses the numerical analysis model developed in this research to simulate the deformation which occurs in aluminium strips when they undergo symmetric rolling, and the variation of rolling force. The research also compares the average rolling force of simulated cold rolling with experimental results. The results verify that the author's model is acceptable.

Research on Fast Calculation of Rigid Plasticity Finite Element Method in Hot Strip Rolling

2008 ◽  
Vol 575-578 ◽  
pp. 288-292
Author(s):  
Chang Sheng Li ◽  
S.N. Song ◽  
R.B. Mei ◽  
G.L. Zhang ◽  
Xiang Hua Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Newton Method ◽  
Theory And Practice ◽  
Convergence Time ◽  
Hot Strip Rolling ◽  
Strip Rolling ◽  
Fast Calculation ◽  
Hot Strip ◽  
Element Method

Fast Finite Element (FFE) method had advantage of high precision and fast computing velocity. The online application of FFE method was significance both in theory and practice. In this paper the fast calculation of rigid plastic finite element method (RPFEM) in hot strip rolling was developed in this paper. The results of rolling force were good agreement to the measured results. The influence of element on calculating time and accuracy was discussed. The running time of one-dimension search was reduced greatly by combining Newton method with Brent method. Improved Newton method with trust region method and forced positive definite Hessian matrix method were used to reduce the convergence time. The better initial value could be obtained by improved mid-point integral Newton method. In addition, the influence of operating system, hardware and software on the calculating time was also discussed. The project of temperature FFE online calculation application in a plate mill was put forward.

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