Comoldable blade root bushing inserts for infused turbine blades

As part of Denmark’s Energy Technology Development and Demonstration Programme (EUDP), pultruder Fiberline Composites conducted the Innovative Blade Root Joint program and has developed an Integrated Pultruded Bushing Insert, comprising glass fiber and polyester resin pultruded onto a threaded steel bushing.

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As part of Denmark’s Energy Technology Development and Demonstration Programme (EUDP), pultruder Fiberline Composites (Middelfart, Denmark) conducted the Innovative Blade Root Joint program and has developed an Integrated Pultruded Bushing Insert, comprising glass fiber and polyester resin pultruded onto a threaded steel bushing. Fiberline engineers explained at the recent WINDPOWER show that the finished product can be comolded into a composite wind turbine blade's root section and then receive the bolt used to connect the root to the turbine’s hub. According to the company, the bushing’s sinusoidal exterior helps the root insert to achieve an 1160 kN pull-out strength. This is sufficient to guarantee that failure will occur in the bolt rather than at the bushing-to-composite interface. The insert also will eliminate current drilling and gluing steps, enabling technicians to quickly position 40 to 60 modular inserts per blade root section prior to infusion.