Could need some advice on flow front


Could need some advice on flow front
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gnidnu
gnidnu
gnidnu
posted 11 Years Ago HOT
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I'm having trouble with this partly double sided infusion. This was the most recent try. Layup:

(Mould Side)
200 g/m² Glass Twill Weave
300 g/m² Carbon Biaxial +-45°
300 g/m² Glass Biaxial +-45°
400 g/m² Glass Unidirectional 0°
10 mm Gurit Corecell M80 Foam, Perforation Grid 2mm / 20 mm
300 g/m² Glass Biaxial +-45°
200 g/m² Carbon Unidirectional 0°
200 g/m² Carbon Unidirectional 0°
300 g/m² Carbon Biaxial +-45°
160 g/m² Carbon Twill Weave
78 g/m² Glass Twill Weave

MTI hose on left side, feed line on the right.
Can't measure absolute pressure, but relative pressure was -0,93 Bar.
Resin was degassed until no more bubbles were visible.
Didn't turn out well. It looks like the flow front on the A side was significantly slower than on top, which resulted in complete dry spots.

http://www.talkcomposites.com/Uploads/Images/71c93ae2-d2e5-4ad0-b79e-2825.jpg


http://www.talkcomposites.com/Uploads/Images/ef930957-4f0d-49e8-8b4a-4956.jpg

http://www.talkcomposites.com/Uploads/Images/00004841-3815-497c-be93-ac92.jpg

Do you have any advice on what to do differently next time? I already tried infusing from back to front instead of left to right, which turned out better.
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Edited 11 Years Ago by gnidnu
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Hanaldo
Hanaldo
Hanaldo
posted 11 Years Ago HOT
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Jeez, and here I am tossing up between cutting my fabric at 600mm and risking not covering the entire part or cutting it at 610mm and wasting excess Tongue
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Could need some advice on flow front
gnidnu - 11 Years Ago
     Yeh that's a hugely thick laminate for infusion, especially when it is 95% uni. You would need to...
Hanaldo - 11 Years Ago
     As above, that's a large stack to be working with, slow the resin right down and give it a chance to...
ajb100 - 11 Years Ago
     As mentioned, that's quite a thick stack, slow that sucker down. Do a test infusion, the same...
ChrisR - 11 Years Ago
     As already said, UD and the overall thickness is slowing things down. The core will also slow things...
Warren (Staff) - 11 Years Ago
     Thank you all so much for your replies, really appreciate your advice. :)
gnidnu - 11 Years Ago
     Jeez, and here I am tossing up between cutting my fabric at 600mm and risking not covering the...
Hanaldo - 11 Years Ago
     Maybe I can help as I've just been infusing a chair core which is a 7mm hit in one go (650 gms CF...
deagrateful - 11 Years Ago
     3 hours!? How long is your pot life??
Hanaldo - 11 Years Ago
             Nearly 10 KG of resin goes into the part. 2/3 of this is infused fairly quickly and then a second...
deagrateful - 11 Years Ago
                 Hi- 1000gsm is not very thick. Some years ago I was working on mast laminates of 25-30mm thick of...
petereng - 11 Years Ago

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