Residual stress of submerged butt-welded joint by finite element simulation and experiments are carried out, and its effects on the fatigue crack propagation life are discussed. A traveling heat source is set as heat input during welding process, and temperature distribution of the specimen is then calculated by heat transfer model. By using thermal-structure couple elements and setting this element as elastic-completely plastic material, the residual stress after the heating process is estimated. The real residual stress distribution is measured by Hole-Drilling Strain-Gage Method. With the use of several specimens having various residual stress and stress concentration, fatigue crack propagation tests are carried out, and how would it affects the crack propagation life are discussed. The results show that the simulated residual stress is consistent to the outcome of measurement. When a crack propagates along the weld toe where residual tensile stress existing, its propagating crack life is shorter then that of base metal. For those reinforcement-removed specimens without stress concentration, it has a longer life then that of base metal. Because the effect of residual stress and stress concentration cancel each other, the butt-welded specimens and base metal specimens have identical propagating life.
|Number of pages||7|
|Journal||Journal of Taiwan Society of Naval Architects and Marine Engineers|
|Publication status||Published - 2008 May|
All Science Journal Classification (ASJC) codes
- Ocean Engineering
- Mechanical Engineering