Can prepreg parts be cured again?


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valerio.polenta
valerio.polenta
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Hello,

I'm building some pregreg components as part of a university project. For brevity, I will skip details, I just tell you that so far I've built some "pipes" with a kind of D-section (and a taper angle to facilitate mould extraction). The picture shows the mould, the prepreg shapes and the final part.

http://www.talkcomposites.com/Uploads/Images/f71904e5-dc01-4790-a690-d3af.png


Now, what I want to do is to attach 2 of those pipes together by placing them adjacent along the flat part and adding an outer layer of prepreg, like in this sketch:

http://www.talkcomposites.com/Uploads/Images/1bc8779f-a185-4ff3-a3f1-ed6a.jpg


My question is: can the two inner pipes go into the oven again? They already underwent a cycle of 4 hours ( 1hr @ 50'C, 1hr @ 60'C, 1hr @ 70'C, 1hr @ 120'C). I'm using Easy-Preg 240g 3K Surfacing Prepreg and Vari-Preg 400g 12K.Backing Ply. I wonder if the mechanical properties deteriorate after a second cycle like that.

Thanks,
Valerio
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f1rob
f1rob
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Give the original parts a higher post cure once de moulded to get a higher tg an you should be ok on second cure

you want to be really sure she n you do second cure tube bag through both pipes when you cure
GO

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