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Chapter One APPLICATIONS Another Navy program which employs composite materials isWtheet Sub. Its composite components have proven reliable for over 15 years. Both the elevator and the rudders are constructed of a syntactic foam core with fiberglass and polyester skins. The outer skin and hatches, the tail section and the fixed fins onWtheet Subare also made of composite materials. The Navy’s ROV and mine hunting/neutralization programs have been using composite materials for structural, skin and buoyancy applications. Current ROVs employ composite skins and frames that are constructed from metal molds using the vacuum bagging process. ThepropellersfortheMK46torpeodarenowbeingmadeofcompositematerials. Molded composite propeller assemblies have replaced the original forged aluminum propellers. The composite propellers are compression molded of glass fiber reinforced polyester resin. Adovfantages the new composite propellers include weight savings, chemical inertness and better acoustic properties. Elimination of the metal components markedly reduces delectability. Additionally, studies have projected this replacement to have saved the program a substantial amount of money. A submarine launched missile utilizes a capsule module that is constructed of composite materials. The capsule design consists of a graphite, wet, filament-wound sandwich fi construction, metal honeycomb core and Kevlraerinforcements. Several torpedo projects have investigated using a shell constructed of composites, including a filament-wound carbon fiber composite in a sandwich configuration where the nose shell of the torpedo was constructed with syntactic foam core and prepreg skins of carbon and epoxy resin. Testing revealed a reduction in noise levels and weight as compared to the conventional aluminum nose shell. Research at NSWC, Annapolis and conducteSdtrbuyctural Composites, Inc. indicates that composite materials have great flexibility to be optimized for directional mechanical damping characteristics based on material selection, orientation and lay-up sequence. [1-1] Submarine Research & Development Projects Numerous investigations conducted by tChaerderock Division of NSWC have done much to advance our understanding of the performance of composites in a marine environment, even if some of the prototype structures have not found their way into the fleet. For internal applications, the recently released military standard for performance of composites during fires outlines rigorous test and evaluation procedures for qualification. For structural elements, the critical nature of submarine components serves as a catalyst for increasing our analytical and design capabilities. The Advanced Research Projects Agency (ARPA) recently sponsored a multi-year project to build dry deck shelter components using thermoplastic resin systems. The goal of this project is to get these highly-specialized structural materials down from $400/pound to $100/pound. Additional objectives, according to ARPA’Jsim Kelly, include development of advanced composite fabrication technologies and embedded sensor technology. [1-16] As outlined in the 1990 National Academy of Science repUosrte of Composite Materials in Load-Bearing Marine Structure, s[1-16] the Navy has targeted several specific applications for composites on submarines. Table 1-2 summarizes these projects and the ARPA effort, along with status, participants and design challenges. 27PDF Image | Marine Componsites
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