The effect of the residual stresses and strains is one of the most important
parameter in the structure integrity assessment. A finite element model is
constructed in order to simulate the multi passes mismatched submerged arc
welding SAW which used in the welded tensile test specimen. Sequentially
coupled thermal mechanical analysis is done by using ABAQUS software for
calculating the residual stresses and distortion due to welding. In this
work, three main issues were studied in order to reduce the time consuming
during welding simulation which is the major problem in the computational
welding mechanics (CWM). The first issue is dimensionality of the problem.
Both two- and three-dimensional models are constructed for the same analysis
type, shell element for two dimension simulation shows good performance
comparing with brick element. The conventional method to calculate residual
stress is by using implicit scheme that because of the welding and cooling
time is relatively high. In this work, the author shows that it could use the
explicit scheme with the mass scaling technique, and time consuming during
the analysis will be reduced very efficiently. By using this new technique,
it will be possible to simulate relatively large three dimensional
structures.
Numerical aspects for efficient welding computational mechanics
