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Microwaves to dry boat hulls
Bruce writes:
For whatever reason the owner, or perhaps the surveyor, cut cores out of the hull and had them tested. The cores tested at 90-something percent of the calculated original strength of the hull material. I find it highly unlikely they could calculate the original strength with a 10% inaccuracy. The materials used were not characterized that well and the variation in the lamination process is much bigger. I have been told by a senior structural engineering consultant that the uncertainty in fatigue life for the materials we know best-- structural steels -- is roughly 6%. Composites, even aerospace qualities, are much, much harder to get good data on. There was no mention of the boat's history or how much time it had spent in the water, and in England many boats are hauled out for part of each year, so the testing was hardly a comprehensive study but, as the magazine wrote, it did show that fiberglass did not deteriorate greatly with age. This is pure nonsense. Fiberglass laminates have limited fatigue life as do all materials. This boat has lived a pampered life relative to its scantlings. /Martin http://hem.bredband.net/b262106/ |
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