Experimental study of collision in scaled naval structures

Abstract Experimental tests of the collision of reduced scale naval structures is here detailed described. First, a web girder section constructed in two different scales, 1/1 and 1/4, is subjected to the impact of a rigid indenter at mid span. The second experiment employs a more complex structure: a head-on collision of a 1/100 scaled tanker against a rigid obstacle. Special attention is given to some similarity complications that are frequent in real tests: model yielding stress different from the prototype and material strain rate. Since the standard similarity laws are unable to deal with those issues, it is shown how to modify the scaling factors to generate a replica similar to the corresponding prototype. Results are shown that support the approach with the modified scaling factors producing a behavior closer to the full-size structure. In the study of the ship head-on collision, only a 1/100 scaled specimen could be tested. In this case, the equivalent prototype was calculated with the assistance of the scaling factors and compared with empirical formulations found in the literature. The methodology depicted in this manuscript can be used as a guidance for scaled impact tests of vessels and other types of large structures.

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