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pressures due to vacuum bag

pressures due to vacuum bag

pressures due to vacuum bag

(OP)
Hi,
firstly, i've never used cosmos so please bear with me...
I'm looking to simulate a glass laminate being placed inside a vacuum bag, and being de-aired under vacuum.
so far i've modelled the glass laminate.
How would you guys go about modelling the bag and simulating a vaccum inside that bag on sworks/cosmos?
Is it actually possible, as a person on another forum suggested it isn't?
it's quite frustrating as I don't want to waste my time trying to do something if its not actually possible :s

Thanks
James

RE: pressures due to vacuum bag

Can you post a pic of your 'glass laminate being'?

RE: pressures due to vacuum bag

To me it seems "impossible". The easiest way to do simulate teh bag is to apply the pressure directly on the model, but I guess the distribution of the pressure over the surface what you are interested in.

RE: pressures due to vacuum bag

the vac bag is going to apply a known static pressure to the laminate, so a uniform pressure applied normal to all 'exposed' surfaces should do.

In reality, the bag will put other stresses/loads onto the part due to a 3d volume being inside of a bag that cannot truly conform to the object, will this effect be large enough to consider? Its possible if its a small laminate.

Is the part just laid into a bag? or is it fixtured to a table and a layer of plastic sheet sucked down on it? These all affect how you'll restrain it.  If its just stuck in a bag and put under vac, it could be tricky, if fixtured to a table, and then force is applied against an underlying mandrel or mold, it could be easier.

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