Helo guy…need your advice. Who can help me on Mathematical model for compaction due to thickness uniformity in complex shape laminates
What exactly are you trying to predict with your mathematical model?
actually i want to predict the final thickness and volume friction of the laminate.at the same time i can predict the void content of the laminate. Do you have any idea on it??
You can calculate the Vf% from the laminate thickness if you have an accurate areal weight of the fiber. You can predict the laminate thickness if you know the Vf% of the processes. To calculate the porosity you need to the know the actual weight of the fiber in the part (pre-weigh the fiber), the weight of the resin in the part (weigh after layup), and you need to know the laminate thickness.
The variables in the Vf can be the fiber format, resin viscosity, processing pressure, resin pot-life (wet layups), perf-ply type, resin temperature during compaction. Vf and prorosity prediction is not mathematical but rather derived from experience. I document the calculated Vf for every fabric, resin, and process that I use. From these observations I can predict the Vf and porosity with my processes and techniques.
You can see these threads for more info on the mathematics with know variables:
http://www.compositescentral.com/showpost.php?p=39589&postcount=2
http://www.compositescentral.com/showpost.php?p=39597&postcount=5
http://www.compositescentral.com/showthread.php?t=7372
great!!!clear explanation.one more thing is i want to know what the famous issue on complex shape especially for L-shaped
I make L-shape parts with a two piece press. I typically get a Vf of 60% with this process. I use this process because it doesn’t require any consumables (peel-ply, perf-ply, breather/bleeder, bagging materials).
what do you mean by two piece press??can you explain me detail on it…or you have specific journal on it?
How about the pressue and temperature?material that you have been used (prepreg/ dry fiber)?
See my responses to one of your previous posts :): http://www.compositescentral.com/showpost.php?p=39668&postcount=6