Effect of Stress Distribution on Fatigue Life of Tubular Joints in Offshore Engineering
In the assessment of fatigue life of tubular joints in offshore engineering, hot spot stress range, in conventional method, is frequently used to predict the number of cycles that a tubular joint can sustain before failure from corresponding S-N curves. This method only considers the effect of the peak stress at the weld toe on the fatigue life of a tubular joint, but ignores that of the stress distribution along the weld toe. The effect of the stress distribution along the weld toe on the fatigue life of tubular joints can be evaluated indirectly by analyzing a fracture mechanics parameter, namely stress intensity factor. The stress intensity factor values of the surface cracks in the fatigue failure process for tubular joints subjected to different loading types, thus causing the difference of the stress distributions along the weld toe, are investigated from both numerical analysis and experimental measurement. The results show that the stress distribution along the weld toe has remarkable effect on the fatigue life of tubular joints.
J. Alfaiate, M.H. Aliabadi, M. Guagliano and L. Susmel
Y. B. Shao "Effect of Stress Distribution on Fatigue Life of Tubular Joints in Offshore Engineering", Key Engineering Materials, Vols. 348-349, pp. 897-900, 2007