Analysis of slab edging by a 3-D rigid viscoplastic FEM with the combination of shifted incomplete Cholesky decomposition and the conjugate gradient method

Edging of slab is an important process to reduce or control width in the ro ughing stand of hot strip mills, Simulation of the edging process was perfo rmed by the rigid viscoplastic FEM, Shifted incomplete Cholesky decompositi on of the stiffness matrix combined with the conjugate gradient method, des ignated the shifted ICCG method. is employed for the first time in a 3-D ri gid viscoplastic FEM to solve the slab edging problem. The performance of t he algorithm has been analysed in terms of CPU time, frictional boundary co nditions, shift parameter psi, memory requirement and mesh size; the comput ed rolling forces are examined. The numerical calculation shows, this metho d can result in substantial saving in memory with the potential to permit u se of a smaller machine but requires a large increase in CPU time. It is sh own, however to be effective for the solution of a problem such as that of the simulation of the slab edging process by the 3-D rigid viscoplastic FEM . (C) 2001 Elsevier Science B.V. All rights reserved.