Heat Conduction Analysis of Welding Moving Heat Source Problem Using Idealized Explicit FEM

摘要

Welding is widely used for assembling steel structures such as shipsand bridges. Quantitative prediction and effective control are requiredto minimize residual stress and welding distortion. Heat conductionFE analysis and thermal elastic plastic FE analysis are generally usedin welding simulations. However, these analyses have very largecomputing time and memory consumption that are proportional to thesquare or cube of the number of degrees of freedom of the analysismodel. To accomplish smaller computing time and memoryconsumption for thermal elastic plastic analysis, we have developedIdealized explicit FEM. In this study, Idealized explicit FEM for theheat conduction analysis is developed and applied to a series ofcomputations for bead-on-plate welding and tandem fillet welding ofa large-scale stiffened plate. As a result, it is found that Idealizedexplicit FEM can reduce the computing time and memoryconsumption of heat conduction analysis especially for large-scaleproblems.