Laminate Sample #44: Prepreg Carbon with Rohacell Cored Stiffeners

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Published 2023-02-25
This sample is a thin carbon panel with stiffeners formed over Rohacell (PMI Foam) core. The idea here is to show how panels can be stiffened with stringers or omega-style cored beams that are interleaved into the layup. The Rohacell 71 IG-F used here is very stable and will not deform at the temperatures required to cure the prepregs.

The base laminate is [0/90,90,+/-45,90,0/90] and the stiffeners have unidirectional reinforcements in the [0] direction.

For more information on Evonik Rohacell cores:
performance-foams.evonik.com/en

For more information of Gurit prepregs:
www.gurit.com/en/our-business/composite-materials/…
All Comments (20)
  • @allisonpower2594
    Thanks for the great detailed info. Clear and concise. I appreciate your efforts.
  • @angstromperformance
    I'm wondering why you are using the peel ply and stack that sucks epoxy from the prepreg? Are not prepregs at the perfect resin to fabric ratio? Normally I see most prepreg stacks just have a non perforated release film and then vacuum bag. So was wondering why the different stack makes sense here? Thanks for the answer!
  • @Anton-zb9dc
    Hey, but what about pressing hard with the thumb on rohacell foam, will there be a visible dent left or not. What about pressing with fingernail?
  • @Anton-zb9dc
    Hey, what do you think, how would this foam feel in direct contact with a skin. Does it fill similar to polystyrene foam? If you could find something more similar I'd love to know
  • @charliegates1088
    where can i find that caclulator you used at the start of the video?
  • @Kicker700
    Where do I find that adhesive sheet? Can you do a video on the types of fittings you like to use?
  • @patrickstroupe4769
    What is the tan layer you put down first on top of the metal base. I've seen you use this before in other vids and nothing seems to stick to it.
  • @MonstroLab
    3d printer bed heater is a great idea I think ill try shine a hot lightbulb at the bottom of my mold made from a 1” glass coffee table
  • @Jimmy_Moon
    I thought I was listening to theradbrad for a moment.
  • @noe616
    This is a complicated and long process that is only applicable to aerospace work. The waste is considerable and certainly can't be considered a green process.