Mesh sensitivity analysis on implicit and explicit method for rolling simulation, International Journal of Structural Integrity, Vol. 9 Issue: 4, pp.465-474, https://doi.org/10.1108/IJSI-07-2017-0046
Abstract
The purpose of this paper is to compare the performance of implicit and explicit integration
schemes for simulating the metal rolling process using commercial software packages ANSYS™
and LS-DYNA™. For the industrial application of finite element method, the time discretization
is one of the most important factors that determine the stability and efficiency of the analysis.
An iterative approach, which is unconditionally stable in linear analyses, is the obvious choice
for a quasi-static problem such as metal rolling. However, this approach may be challenging
in achieving convergence with non-linear material behavior and complicated contact
conditions. Therefore, a non-iterative method is usually adopted, in order to achieve
computational accuracy through very small time steps. Models using both methods were
constructed and compared for computational efficiency. The results indicate that the explicit
method yields higher levels of efficiency compared to the implicit method as model
complexity increases. Furthermore, the implicit method displayed instabilities and numerical
difficulties in certain load conditions further disfavoring the solver’s performance. Comparison
of the implicit and explicit procedures for time stepping was applied in 3D finite element
analysis of the plate rolling process in order to evaluate and quantify the computational
efficiency.