A Numerical Thermo-Mechanical Model for the Welding and Subsequent Loading of a Fabricated Structure
BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
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A numerical model is developed for the welding and subsequent loading of a fabricated structure. The model treats the weld process as a thermo- mechanical problem. A finite element formulation derived from the uncoupled thermal and mechanical energy balances forms the basis of the model. During the development of the thermal model, two significant problems are discussed. One is the material nonlinearity, which manifests itself in the temperature dependence of the thermal properties, and in the fusion problem, where the material phase change is accompanied by a latent heat effect. During the second part of the work the mechanical model is described. This is an incremental finite element model in which the basic constitutive descriptions are time independent elastic-plastic behavior with temperature dependent properties, and a creep rate formulation for the time dependent behavior. The development is not based on thermodynamic theories but on direct extension of the classical isothermal theories. Finally the model is compared with simple bead-on-plate weld experiments, performed with high strength steels.
- Structural Engineering and Building Technology