Computational Aspects of Welding Stress Analysis

摘要

The residual stresses and deformations due to arc-welding are determined in a rectangular steel plate. The thermomechanical response behavior is computed in two steps, (1) the heat flow analysis of the entire plate due to the moving electrode, and (2) the thermoelastic-viscoplastic response analysis of the midsection for the transient temperature history at this section. The staggered solution strategy leads to a fully integrated approach of the thermal and mechanical solution steps within each time increment providing for weak thermomechanical coupling. The main difficulties arise due to the transient character of the heating-cooling cycle which spans the entire temperature regime from room temperature up to melting and vice versa. The incremental solution of the thermoelastic-viscoplastic process is illustrated with the arc-welding of a rectangular steel plate for which limited experimental data are also available.