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| Riser strings link offshore platforms to the seabed and support land-bound structures such as wind turbines. Such risers can reach over 100 meters in height. Drilling risers in the oil and gas industry can reach over 4000 meters. Each kilogram of weight that goes into structure, however, becomes a load that also must be supported by additional structural weight, and this limits the payload of a platform or tower. This technology mates load-bearing composite tubes to the metal fittings that support them, thus allowing composites to be used in applications currently requiring steel risers. The composites are geometrically prestressed during construction and mated to their metal fittings in a way that eliminates lateral and axial fatigue. Fatigue in metal risers -- from ocean currents or wind -- is the primary cause of failure. Composite risers mated to metal fittings in this way are essentially immune from fatigue. The technology has additional application where any composite tube must join any metal fitting in a way that eliminates movement at the joint. Software tools included with the technology and patents accurately predict the state of stress between the tube and fitting. The software and construction methods have been tested in real-world production parts. Patents protecting the technology are in place.BACKGROUND relates shaft joints metal composite material components quite effective transmitting torsional axial loads breaking cutting fibers connection typically layers wound fiberglass relatively modulus graphite |
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