Prediction of longitudinal bending distortion in a fillet welded tee beam using finite element method

摘要

The analysis of longitudinal bending distortion in a fillet welded tee beam has been performed using finite element method (FEM). The two dimensional cross sectional model is selected for the transient thermal analysis and a generalised plane strain element is selected for the stress analysis. The various phenomena associated with welding viz. distributed arc heat input, temperature dependent material properties, surface heat losses etc. are accounted in the model. The stress analysis is performed taking the thermal load as input and the non linear elastic plastic analysis is performed using Newton Raphson's method and convergence is ensured after each time step. From the displacement results obtained using the generalised plane strain analysis, the curvatures for various time intervals are determined and from die curvature data, the transient displacement at many locations on the beam are computed. The model is validated through experimental trials on a submerged arc welded tee section beam. The paper highlights the details of thermal and stress analysis, the experimental details and the results obtained.