Abstract
Torpedo combat and evasion training exercises using trials torpedoes are valuable but involve significant risks to the target submarine in the event of an accidental impact. This paper presents a study of impacts of a nominal heavyweight torpedo against a nominal submarine pressure hull, simulated using the nonlinear explicit finite element analysis code LS-Dyna. The model is validated against experimental work published by the Australian Defence Science and Technology Organisation, then expanded to a segment of a full-size submarine. Impacts were simulated at torpedo speeds of 30, 40 and 50 knots. It was found that the 30 knot impact produced no plastic deformation in the pressure hull, while the 40 and 50 knot impacts produced permanent dents of several mm depth. Reference is made to DNV GL submarine structures rules to suggest that these dents will not impair operational capability.
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