Quinn, S, Moy, S.S.J. and Piggott, K.
Lifting analysis and load test of a hook foundation in a GRP hull: a case study.
At 2nd NAFEMS Industrial Seminar, Simulation versus Test: "Linking Computational and Experimental Techniques in Industrial Applications", Nottingham, UK,
09 Nov 2005.
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A new semi-rigid inflatable rescue craft, the Delta Autonomous Rescue and Recovery Craft (ARRC), has been developed by Delta ARRC Ltd., with design support by Amgram Ltd. This craft is 18.8 m long, has a mass of 30.6 tonne and is to be lifted onto a mother ship using a two point lift system. The local details of the lifting points in the Glass Reinforced Plastic (GRP) hull were determined from Finite Element Analysis (FEA) performed by White Young Green Consulting.
Each lifting point, forward and aft, has a safe working load of 16 tonne and the statutory requirement is a safety factor of 6 against failure. The FEA determined the additional hull thickness required at the lifting points and other specific details of the connections such as the number and size of the bolts and the plating thicknesses.
The FEA showed that the revised lifting point details met their statutory requirements but the only way to prove this in practice, before manufacture of the new boat, would be to perform a full load test to 96 tonne. A specimen that was representative of the locally thickened hull together with a central GRP rib was chosen and the test rig was designed by the University of Southampton.
Load was applied in 8 tonne increments, to a maximum of 92 tonne, a safety factor of 5.75. It was at this stage that the test was discontinued due to safety concerns. However, considering that the test was more onerous than the real situation and that the specimen was only lightly damaged and capable of carrying further load it was concluded that the lifting point configuration met its statutory requirements.
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