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Industrial Use of FRP Marine Composites Drive Shafts Power transmission drive shafts have been built from composite materials for over a decade. Initial applications focused on high corrosivity areas, such as cooling towers. As end fitting and coupling mechanisms developed, other benefits of composites have been realized. Addax, Inc. has built over 1700 shafts up to 255 inches long with power transmission to 4,500 hp. Figure 1-48 shows a flexible composite coupling patented by Addax that allows for misalignment. Industrial drive shafts that weigh 500 pounds when made from metal can weigh as little as 100 pounds when built with carbon/epoxy. [1-65] Bridge Structures Several recent projects headed by universities have focused on applying composite materials for infrastructure applications. The University of California, San Diego undertook an ARPA effort that focused on renewal and new structures. The higher profile tasks included: wrapping deteriorated and seismic-prone concrete columns; manufacture and analysis of bridge decks; cable and anchoring technology; and development of composite wear surfaces. Figure 1-48 Allows for up to 2 Misalignment [Addax] Patented Flexible Coupling Wrapping concrete columns with helical reinforcement is being approached Figure 1-49 Early Prototype Truss differently by several companies. XXsys Structure Built by Hardcore DuPont and Technologies developed a wrapping Tested at UCSD [author photo] machine that applies carbon/epoxy prepreg in a continuous fashion. Hexcell Fyfe uses a glass/epoxy system known as Tyfo S Fib,rwrap which is applied by hand wrapping. Both NCF Industries and Hardcore DuPont utilize a technique where prefabricated shells are fit around columns and bonded in-place. ClockSpring uses a continuous prepreg wound around columns in a process borrowed from the offshore oil industry for heating large pipes. [1-66] 56 tmPDF Image | Marine Componsites
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