By OneLooseCrank - 5/9/2013 2:30:22 PM
Hi there, first post, but I'm starting my own project so I should be on here quite a bit over the summer. I'd like to ask about unidirectional weaves - does Easy Composites sell this? And with a bidirectional weave, how much strength is given in each direction?
Also, I'm considering making various tubes out of single layers of carbon, curing them, then bonding the tubes together as a final structure, finally wrapping the entire structure multiple times for strength. When I oven cure the whole assembly, which will be vac bagged, will the inner tubes that were cured initially become maleable in the heat - potentially leading to deformation of the structure? (for further info, the inner tubes will be made around expanding foam which I will want to remove from the final structure, but once the tubes are combined there will be no way I can get it out, hence the two stage process. The inner tube will become the 'mould' for the outer layers).
If this is so, is it possible to use an epoxy which cures at a higher temperature on the initial, inner tubes so that curing a second time when fully wrapped can be done at a lower termperature?
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By Warren (Staff) - 5/10/2013 4:19:23 PM
We sell unidirectional carbon fibre in 2 wieghts.
CarbonFibre Unidirectional 100g
CarbonFibre Unidirectional 250g
A Bidirectional weave usually has the fibres orietated 90 degrees from each other in two directions.
They are very marginally slightly stiffer than a typical 2/2 twill or plain weave fabric as the fibres are laid out flat where as with a woven fabric the fibres bend up and down over the warp and weft as they are woven.
If you are using a suitable resin on the "inner" tubes and you post cure those tubes to the right temperature, then they shouldnt go soft when put back in the oven.
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