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Kayak and Canoe Design Bulletin Board
Re: busting laminates
Posted By: Tapio Manner In Response To: Re: busting laminates (Nick Schade)
Date: Monday, 1 May 2000, at 1:24 p.m.
: Tapio, Do you have any report or more detailed information you could share
: with us? Graphs, numbers, pictures? NickSorry, haven't got anything left after three movings. But I still remember a few things: we ended up using a so called "mini sandwich" which has the "harder" (glass, carbon) reinforcements on the outsides and organic fibers in the middle. We used a commercial laminate analysis program to screening and then tested the chosen ones. Bending was done with a simple spring scale arrangement and impact by taking a fairly heavy steel bar and dropping it from constant height several times or rising it trying to get penetration on one go. Both gave results in the same direction. Be careful if you test that way, some of the test panels bounced the bar back quite high!
There seems to be a composites design discussion going after this started, intresting subject but there is just no way to teach anisotropic materials design philosophy by e-mail. And the idea of using FEM (users of which logically are called FEMinists) does not make it any easier.
I think we used finally 150 g/m2 (2/2 twill) carbon on the inside, 160 g/m2 reinf-polyester in the middle and 160 g/m2 (2/2 twill) glass on the outside. And spent sometime trying to get the resin content to the minimum, I think we ended with something like 50/50 in weight which is not too bad considering the carbon and polyester.
TLM
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Kayak and Canoe Design Bulletin Board is maintained by Nick Schade - Guillemot Kayaks with WebBBS 5.12.
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