One method of improving temporary rigging processes during shipbuilding is through the use of lifting lugs integrated directly into ship’s structure rather than traditional weld on/burn off padeyes. This method relies on a the inherent strength of a ships bulkhead to lift an assembly rather than a traditional padeye, and reduces the efforts involved in the installation, removal, and repair of the area around a temporary padeye. The application of ASME Below-The-Hook design guidance to such lifting strategies is not necessarily straight forward, as one of the main causes of failure for thin plate pin connections is dishing, a form of tripping or buckling of the plate near the lifting hole. This paper presents results from the destructive testing of several such lifting lugs with specific attention paid to out of plane loads and their effect on dishing initiation.

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