Role of stress concentrations in welded joint fatigue

The different formalisms have been examined for calculating stress concentration factors, especially in welded joints, according to the radius at the weld toe and the connecting angle, and the results compared with those stemming from a finite element method. The fatigue notch factor is derived utilizing a description of the stress field at the welded joint tip. The applications of the notch stress intensity to a welding stitch, a welded reinforcement and a T welded joint are studied in detail and the values of the fatigue notch factor or the notch fatigue sensitivity index are presented.

Keywords:

• Weldment
• Stress Concentration Factor
• Butt Weld
• Notch Sensitivity
• Fatigue