Vertical lamination for sandwich structures by infusion.

General Composites Discussions Engineering Talk
#1

Hello, I’ve been experiencing, I wondered if he could create a vertically laminated on a foam core with infusion and have found possible.

I infused two test parts, with triaxial glass skins 900g/m2, one of this with vertical laminate triaxial glass 900g/m2. Vertical laminates are glued are double-sided tape

As expected, the mechanical properties improved significantly in the part with a vertical lamination, specially on compressive strength (for test, I used extruded polystyrene 40kg/m3 a core with a very poor mechanical properties , I guess, that if you use pvc 80kg/m3 wouldn’t have a big improvement)

I would like know your opinions about this technique, because I am improving the properties of the core, but I’m also increasing its weight. Is it worth?
You think this is good idea?
Does this technique has been used before?

Probably this weekend I will do my first part by infusion,(a longboard) this will have two skin approximately of 1200 to 1300 g/m2 of glass, and a core of 80kg/m3 10mm of pvc.

Do you think that it was a good idea apply this technique in this case?

Regards and thank you very much!
And I sorry for my English , I don’t know if all can be understood correctly.

#2

I forgot to say that in the photos you can see, the part with the vertical laminated , but I’ve removed one of the skins and all the foam to check vertical laminated had been infused properly.

Regards

#3

can you show more pictures of your longboard project?

it seems like a good idea to stiffen the board. how many vertical sections are you planning to have? are they going to run from front to back?

-david

#4

Hi David, for this longboard, I only apply side to side (under truck sides) , because I’m looking a specific flex in this longboard, vertical sections side to side, only will do more reactive turn, without affecting the flex of the board, also will avoid the trucks compress foam, or at least, those are the expectations.

I will show more pictures :wink:

Regards

#5

#6

Current state, but I’m having a serious leak, and I’m afraid that problem it’s the mold, It’s made polystyrene foam and 3 layer of 105g/m2 glass top and none bottom, I’m going to laminate bottom to try solve the problem, I keep vacuum during laminate process to help seal leak, I hope this helps :frowning:

Regards

#7

ah, i see, pretty cool.

you could envelop bag the mold - that is, you could put the whole thing into a vacuum bag and not worry about leaks in the mold… a bit messy with infusion though, you might have resin flashing all over the exterior of the mold and might potentially trap the part in somehow… but if you’re only going to make one with this mold, maybe it could be sacrificial?

-david

#8

I thought, make a double bagging, with the first bag, would have been little work, also would get other advantages besides for double bagging, but I will decide repar the mold, some resin came to the laminate!but not in one end part of the piece

The piece is already infused, however, I made a terrible mistake! I let some air go
through the input hole, it was really little, tomorrow we will see the consequences …

Regards

#9

Here result, realy infusion was a completly disaster, however, board is perfectly usable, and vertical laminate it’s made!

Regards

#10

very cool! good progress!

how does it ride?

-david

#11

It’s nice, and soft, shape is really successful for my, I am very happy with the result, thanks!