Large-Scale Welding Deformation Analysis of Ship Structure by Idealized Explicit FEM Using Multigrid Method

摘要

In the construction of ship structures, welding deformation causesvarious problems. To reduce welding deformation, analyses by thefinite element method (FEM) are very useful. However, in a shipstructure, the computing scale becomes enormous and so the predictionof welding deformation is difficult. To predict the welding deformationof ship construction, this research employed Idealized Explicit FEM,which was developed for analyses of large-scale welding problems. Toattain more efficient computation, a multigrid method was introducedinto Idealized Explicit FEM, and its capability is evaluated in theanalysis of welding deformation of a ship structure consisting of almost10,000,000 degrees of freedom. The analysis finished in practicalcomputing time and confirms that multigrid-method Idealized ExplicitFEM is effective for the analysis of large-scale thin-plate structuressuch as ship structures.