Helo guys,i want to know whether we can create Evac system same as OoA prepreg on the normal autoclave prepreg or not. Hope you guys can give an opinion for those familiar with this.
Why during curing process, the degree of cure is important part on composite consolidation??
Probably for the same reason why the cakes has to be baked…
If you cure something to 50% of cure, then your part will be very weak. Always cure to at least 90%, 100% is better, ovbiously.
Not sure what you mean by an evac system the same as OoA prepreg…
You only need normal vacuum bagging materials, and a high vacuum pump. There is a thread somewhere on here about pumps. You need one of the best.
and of course, OoA specific prepreg!!!
Is there a thread on the art of baking? Parts of course.
Baking parts is as simple as following the resin manufacturers curing schedule. Just follow their recipe.
I disagree there is an art to cooking parts. Sure the manufactures spec sheet is a start but you need to adjust your ramp rates and dwells to ensure the best parts. If the laminate is thick or the mould is thick or metallic we often will add an extra dwell and will ramp slower. For example we cooked a 50mm solid block of carbon last week, my cycle was:
0.5C/min to 60deg for 1 hour then
0.5C/min to 80deg for 1 hour then
0.2C/min to 100deg for 30min then
0.2C/min to 125deg for 90min.
I had a temp probe on the part and it only exothermed 5deg above the set points.
We use the same material for other parts that are just one layer each side of nomex and use a cycle that is 4C/min to 125deg for 90min. Looking at the gel time and flow proprieties show you where you can dwell to allow resin to flow but not cure. I’ve been playing with cooks for 6 years now and still learning new tricks.