I’m trying to do a stringless epoxy with a carbon fiber parabolic frame and a quadaxial lamination- for added stiffness. I’ve found a couple quadaxial cloths on ebay but the lightest I found was 22 oz per square yard. Would anyone care to shed some light on where they get their quadaxial cloths from, what the proper one to buy is, or any other tips/wisdom pertaining to this technique?
Bobby
Conceptually, multiaxial isn’t the best way to go to increase stiffness. The diagonal directed fibers give less stiffness than of you just used warp glass, and had all the fibers lengthwise. Biaxail gives you a more uniform strength in all directions.
As for the carbon parabolic, the number of layers, and the length of the carbon patch is how to design your flex zones. It is more than just running some carbon tape the length of the board. add multiple layers where you want more stiffness, and fewer to no layers where you want more flex. Taper the carbon transition, so you don’t focus the flex into one spot, and snap the board.
Also, how you stage your cloths has a lot to do with it. Carbon (stiffest material) directly against foam (least stiff material) can cause shearing failure between the two materials. Better to have differing stiffness materials stagger. Foam against Nylon against Fiberglass against Carbon.
Hope that makes sense.