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Chapter One APPLICATIONS Deckhouse Structure The U.S. Navy has made considerable progress recently in the development and demonstration of blast-resistant composite design concepts and prototypes for deckhouses, superstructures and other topside enclosures for naval combatants. These composite concepts offerLap Joint significant advantages over conventional steel structures, including a 35 to 45% reduction in weight, reduced corrosion and fatigue cracking, and improved fire containment. [1-37] Material Characterization Lap Joint Full-Scale Beam/Joint Component A single-skin stiffened and a sandwich Figure 1-36 Hat-Stiffened Deckhouse core concept have been developed for Panel Test Elements [Scott Bartlett, NSWC] topside applications. The stiffened concept involves the assembly of prefabricated hat-stiffened GRP panels using prefabricated GRP connection angles and bolted/bonded joint details. Panel stiffeners are tapered to maximize peel resistance, to minimize weight, and to simplify the joints and panel connections. The sandwich concept utilizes prefabricated sandwich panels that are attached through bolting and bonding to a supporting steel framework. A steel framework is attractive for the construction of composite topside structures since it is readily erected in a Figure 1-37 Arrangement of GRP Deck- shipyard environment, allows for the house Proposed for the SSTDP Sealift Ship attachment of prefabricated high-quality [Scott Bartlett, NSWC] GRP panels, and provides resistance to collapse at elevated temperatures under potential fire insult. France’s newest frigate makes use of glass/balsa core panels made with polyester resin for both deckhouse and deck structure to reduce weight and improve fire performance as compared to aluminum. The shaded areas of figure 1- 38 shows the extent of composite Figure 1-39 French LA FAYETTE Class sandwich construction. [1-38] Frigate Showing Area Built with Balsa-Cored Composites [DCN Lorient, France] 39PDF Image | Marine Componsites
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