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A marginal note on carbon wrap

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Whatever figure you use, the conclusion will be that you attained the strength
equal to a certain layer of steel wrapped around the column.
This is right, but in a limited sense. Strengthwise, yes.
But if you wishe to help protecting the column against blast,
there is another part to it, which is energy absorption capacity or toughness.
Just remember that the best elongation you are going to get out of carbon fiber
is up to 1.5%. A construction steel has 10x that or more.