Laminate Sample #24: Spread-Tow Carbon / Epoxy with PVC Foam Core
Ғылым және технология
Laminate Sample #24 is about two things: spread-tow reinforcements and the necessity of perforating core. For comparison, we'll look at Laminate Sample #18, which uses the same 3mm (1/8") Divinycell H80 core, but with perforations and an easy-to-see-through e-glass laminate. What a difference a bunch of little holes make!
Most foam core materials can be purchased pre-perforated from the manufacturer. This can save you a TON of tedious drilling.
Reinforcement: 185g Hexcel PrimeTex
Core: Divinycell 3mm / 0.125" H80
Resin: Proset 135/224
It is a shame to waste pretty carbon on a panel that comes out like this but that's what these laminate samples are all about: demonstrating how and how not to use a wide variety of composite materials while giving some idea of relative weights and stiffness.
This panel would be lighter by a bit if the resin were bled off the mold-side skin. This could be maybe 10% - or about 130g per square meter. Some resin would be needed to fill in the perforations in the core... but less than the extra that would have been squeezed out. Laminate Sample #18 can be a good guide weight-wise because the reinforcements are approximately the same areal weight.
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Пікірлер: 10
I appreciate the work you have done to make so many different videos regarding composites. Your presentation is concise with useful orderly information and proper viewing angles. Thank you!
excellent teaching and demonstrating
@ExploreComposites
3 жыл бұрын
Thanks! I'm working on the teaching part - and learning how to make more watchable videos... Bit of a learning curve to this video thing!
I love how you clearly spell out everything you do and post a spreadsheet of the laminate with all the pertinent data. I wonder what that laminate would have weighed had you perforated the foam. Also how much stiffer had you used 1/4" H80 foam.
@ExploreComposites
3 жыл бұрын
Thanks Grant! I kind of looked into the weight estimate in the description but would say probably 10-15% weight reduction by fully bleeding off that excess resin. I put a lot of extra resin in that first skin! The stiffness would probably go up a bit less than 4X with doubled core thickness. Weight wouldn't go up much at all. I may have to try one like that to redeem myself and make something pretty with the spread tow.
@GrantOakes
3 жыл бұрын
@@ExploreComposites The laminate above, perforated with 1/4" foam will be my test for a wing skin material for a very lightweight aircraft. 1/2" for fuselage skin (with stringers and bulkheads for additional support).
Good work bro
@ExploreComposites
3 жыл бұрын
The composites didn't turn out so nice - but I'm glad you thought the video was useful.
You didn't roll the core to get air out........part of your problem..........Z
@ExploreComposites
2 ай бұрын
I think you're right - though I would have had to start from one edge and work across. Without any holes through, the air would only be able to escape if worked all the way across the surface to an edge.