Reply To: Stress concentration calculation at joints (Hotspot Stress)

[karim.el-ghamrawy]

Hi,

Thank you very much for your reply. There are two issues here, I do not have the license for the seamweld in ncode (as far as I know it is a separate license). The other issue is I am not modelling the weld itself, so as per the guidelines for  fatigue analysis for offshore structures, in order to have accurate results at the joints, I need to account for the hot spot stress by extrapolating the stresses around the joint. As I understand, in the fatigue analysis, I need a scalar value at each node to compute the life of the structure (combination method). Again as per the DNV rp c203 guideline, the principal stress is an acceptable measure. 

So if we imagine there is a way to compute the hotspot stress at the desired locations in mechanical; then I would like to modify the stress tensor with the new values at these locations to be able to compute the updated principal stresses which takes into account the notch effect. I am not sure if this makes sense.

Please let me know what you think.

 

Many thanks,