By wojtepanik - 10/17/2013 11:20:27 PM
My supplier has something called kevlar honeycomb, as far as I know it is made out of kevlar paper(?) pre-impregnated with phenol resin. It is realyyyy expensive 70euro exl.vat for 2mm x 2550mmx1250mm and 48kg/m^2, he claims that it is the lightest sandwich in the world. I don't have money to buy it, but when I have some $ I will make some reviev of that, this is how it looks like : Here are some more info but unfortunatly in polish, but I quess it is not hard to understand things like dimensions or price  |
By Warren (Staff) - 11/1/2013 5:37:02 PM
To add fixings to composites you generally need a way to spread the load and prevent "rip through". For small fixings a common simple method is to bond on what is known as "big head" fasteners which is a plate with a captive nut or bit of stud on it. You can bond and laminate them into place.
Another solution if you are bolting through a solid laminate is to use a load spreading plate on the other side of the laminate with captive nuts or studs on it.
For cored panels generally you need an insert of some kind, be it aluminium or other metal or resin potted into a cut out void to help spread the load and avoid the fixing crushing the core.
Specifically for cored or honeycomb panels have a look on Hexcel.com at some of thier technology guides. Specifically this one: Sandwich panel technology is great for showing how to put fixings in cored panels as well as joining panels etc.
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