Side panels of FPSO (floating production, storage and offloading) units can be subjected to collisions by supply vessels and the resulting damage may lead to a fatigue failure, considering the long in-service period and the action of dynamic loads. The aim of this work is to evaluate Stress Concentration Factors (SCFs) in damaged panels and their effect on the fatigue life through a theoretical study A finite element model is developed to reproduce a supply vessel collision and evaluate resulting SCFs under in-plane compression load. A parametric study is carried out considering different damage magnitudes and the results obtained are used to develop an analytical expression to provide SCFs as a function ot dimensions of damage and panel. These SCFs could be used in a theoretical fatigue life study, which can help to forewarn a fatigue failure under the event of accidental collision.
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