Laminate Sample #35: Vacuum Bagged E-glass / Epoxy with Plastic Honeycomb Core
Ғылым және технология
Laminate Sample #35 is about thermoplastic honeycomb core, bagged wet layup and putting peel ply on the face of a layup. Nothing fancy here, just a quick look at a material that hasn't shown up in the laminate library yet.
The CarbonCore polypropylene honeycomb is a tough and inexpensive core material. This is one of several brands that are similar in processing. There are some that can be infused with that have a solid resin-proof scrim so the honeycomb cells don't fill with resin. Here the scrim is not resin-tight - at least not with 7psi of pressure from a vacuum bag at half-squish. A filled core bonding putty would be an improvement - as would less vacuum!
Thermoplastic honeycomb is great for open molding because it is light and doesn't suck up tons of resin like balsa. Going to work on a sample done this way with polyester or VE resin. In thicker sections, this core can be used to assemble parts like you would from plywood - then just laminate over.
For more information on practical composite construction, check out the EC! site:
explorecomposites.com/
Пікірлер: 19
Thanks for the video!
i need to produce perforated honeycomb panel pls suggest and make it on this video, how to make it?
Do you have a video on the different properties of diff honeycomb core materials like aluminum, nomex, polyprop, etc...
@ExploreComposites
5 ай бұрын
No videos, but some general core data here: explorecomposites.com/articles/design-for-composites/basics-cored-structures/
@ubacow7109
5 ай бұрын
Thanks! @@ExploreComposites
I use the same technique of laying out my laminate schedule in reverse, makes the layup go so much easier. One question however, I thought that epoxy doesn't bond well to polypropylene.
@ExploreComposites
3 жыл бұрын
You're totally right Grant! I missed communicating the detail that the scrim is a polyester non-woven that is itself somehow bonded to the polypropylene. The resin doesn't stick well to the cell walls themselves and I was able to easily pop off the chunks that had pooled in the cells where I cut through the panel.
@GrantOakes
3 жыл бұрын
@@ExploreComposites But wouldn't the 6oz glass peel off of the poly skin on the sandwich panel? It doesn't look like it was just honeycomb you bonded to, it was a poly sandwich you reinforced with glass.
@ExploreComposites
3 жыл бұрын
@@GrantOakes The honeycomb has a polyester scrim bonded to it so it feels a bit like a layer of strong plastic paper towel over the open cells. Epoxy seems to bond very well to this - I should have included a destructive test but forgot. I did break some and it is surprisingly tough.
At first I thought it would be a good core material for boats, but the cells filling up with resin makes one wonder. Is it due to porosity of the scrim?
@ExploreComposites
3 жыл бұрын
Yes. I was pushing my luck with the vacuum bag here. I think the normal use would be with less vacuum or just open molding. Resin in the cells isn't terrible - just a bit heavier than would be ideal. There's no structural issue.
@ExploreComposites
3 жыл бұрын
It is very common in boats - especially decks and flat parts.
@qcnck2776
3 жыл бұрын
@@ExploreComposites Thanks, that makes sense. I was thinking in aircraft mode, where hollow cells = much weight savings.
@JasonKuehn
2 жыл бұрын
I've used a ton of plascore with open mold less hand layup (hovercraft/boat hulls). Incredibly strong for weight and very economical to use. The cells do not fill with resin at all, it just stays on the scrim, so I'm sure the vacuum was the reason it soaked in.
@EdsPlace
2 жыл бұрын
@@JasonKuehn I'm planning a truck camper. Do you think it would be beneficial to vacuum infuse panels and then join panels with hand layup or best to just build structure then hand layup whole thing?
Where do you source that core material?
@ExploreComposites
3 жыл бұрын
This CarbonCore came from LBI Fiberglass in CT, USA. CarbonCore sells direct. See also Plascore.
I need to produce Chopped Strand Mat Glass Fiber (Filler) + Epoxy Resin (Matrix) composites through Vacuum Bagging technique. Could You suggest me any online resources for the same or drop me your mail id ..
@ExploreComposites
3 жыл бұрын
I'm not sure I understand the materials and the question but there's a link to email on the explore composites.com site. Chopped strand mat and epoxy can be an issue because of the styrene soluble binders that most chopped strand comes with - you can get it compatible though if you need to.