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Has anyone document a workflow to implement Hot Spot Stress Approach of welded structures according to IIW Hobbacher (Ed), 2009? I have encountered a scenario that the extrapolated stress at 0.4t and 1.0t is trending downwards instead of upwards.

Has anyone document a workflow to implement Hot Spot Stress Approach of welded structures according to IIW Hobbacher (Ed), 2009?
I have encountered a scenario that the extrapolated stress at 0.4t and 1.0t is trending downwards instead of upwards.