Accession Number : ADD017459

Title :   Retrofittable Monolithic Box Beam Composite Hull System.

Descriptive Note : Patent, Filed 30 Sep 92, patented 10 Jan 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Fischer, Eugene C ; Crane, Roger M

Report Date : 10 Jan 1995

Pagination or Media Count : 10

Abstract : A double hull structure includes a controllably crushable stand-off structure for maintaining a separation between inner and outer hulls and may be retrofit onto existing hulls either in modular and/or break-away sections or as a complete 'shoe' enclosing the existing hull. This retrofittable hull is preferably of a non-metallic composite material which reduces or eliminates corrosion of the existing hull, extending the usable lifetime thereof. The controllably crushable stand-off structure is designed to provide sequential failure, preferably by sequential energy absorbing brittle fractures with little elastic deformation, to provide protection of the existing hull during collisions and/or groundings and thus enhance cargo containment. The brittle fracture is preferably provided by the use of non-metallic composite material in beams of the stand-off structure and/or the inclusion of syntactic foams.

Descriptors :   *COMPOSITE MATERIALS, *SHIP HULLS, *PATENTS, CORROSION, BEAMS(STRUCTURAL), DEFORMATION, COMPOSITE STRUCTURES, STRENGTH(MECHANICS), FRACTURE(MECHANICS), BRITTLENESS, STRUCTURAL RESPONSE, FAILURE(MECHANICS), COMPRESSIVE STRENGTH, BUOYANCY, FOAM, CRUSHING, RETROFITTING, CONTAINERIZING

Subject Categories : Air Condition, Heating, Lighting & Ventilating

Distribution Statement : APPROVED FOR PUBLIC RELEASE