Author(s):
1. Dragi Stamenković, Termoelektro Belgrade, Serbia
2. Katarina Maksimović, City Administartion of City of Belgrade, Secretariat for Utilities Services, Serbia
3. Slobodanka Boljanović, High School of Mechanical Engineering, Belgrade, Serbia

Abstract:
The presence of residual stresses in welded structures can significantly affect the material\'s resistance to fatigue under cyclic loading. The presence of tensile residual stresses adversely affects the fatigue crack growth rate increased it. Change of microstructure and hardening material as a result of the welding process also has a negative impact on the growth of the crack. In addition, the welding residual stresses must be taken as a very influential factor in the assessment of residual life. Accurate prediction and reliable assessment of the residual stress are important for the structural integrity and residual life assessment of welded parts design. However, accurate determination of residual stresses due to the welding process is very difficult due to the complexity of the welding process, which among other things involves local heating, material properties depending on the temperature, powered heat source, etc.. Although there are several techniques for the determination of residual stresses, finite element method is one of the most convenient and useful. This paper presents a finite element modeling procedure to determine of crack growth behavior of butt welded joints under the action of load for mode I. Computation results are compared with available experiments.

Key words:
Residual stress,Residual life,Crack growth rate,Finite element method,Butt welded joint

Date of abstract submission:
15.01.2013.

Conference:
DEMI 2013

Applied paper from author