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...there was one study that said wind turbine blade lost at least a few percent of their integrity between day 0 manufacturing and getting them to the wind farm.
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An engineering problem.
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How do we make a composite that gets stronger until failure, like aluminum does?
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Roman concete. It might be a little hard to make a windmill of it.
Else nanoscale 3D printed metamaterials (GRX-810) that's a thousand times stronger to start.