Bottle Crush Simulation

[afb66t9]

I am new to the area of fea. Could some one please provide an outline of how to conduct a non linear crush analysis of a plastic bottle. I will include a link with an image of a bottle that has been simulated.

http://www.saec-kv.com/engineer.html#

Can Cosmos Works or Design Star conduct this type of simulation.

 

[FrenchCAD]

don't forget your bottle will offer some symetry plans, it will make your calculations lighter.

Cosmos should be able to make it. I made fea calculations with it for an hollow plastic wheel and it worked fine.

Cyril Guichard
Mechanical Engineer

 

[ParabolicTet]

pardon the ignorance, but why go through all the trouble when you can just go out and crush a bunch of them with your foot? i don't have any experience with plastic, which is why i am asking.

 

[ParabolicTet]

also if you are new to the fea, why start out with one of the most complicated problems? start simple and build in complexity as you understand the problem better.

 

[afb66t9]

ParabolicTet & FrenchCAD, Thanx for the reply.

I work for a Blow Molding company designing new plastic bottles so I am hoping to conduct analysis before a product is made. I understand this is a very complicated type of simulation. I have been trying to work through as many tutorials as possible but I have not been able to find any tutorials related to thin walled plastic parts. Does anyone have any good links that could help me understand this type of problem.

 

[GregLocock]

You'll need non linear geometric (ie large deflections) and non linear material properties. It also looks as though you will be getting into elastic-plastic buckling of curved plates. E-P analysis of struts is pretty complex, never mind curved plates. I do not know if Cosmos Works or Design Star can handle either or both non linearities. I do know that for this sort of analysis we'd use LS DYNA and would have a lot of correlation data available before we'd trust the result.

Gas pressurisation of the contents would also affect the result.

In short I would only believe the results of this analysis if a physical test program of a very similar part had already been correlated with a similar model.









Cheers

Greg Locock

 

[johnhors]

Rockfield Software would be well worth a look, their software handles elasto-plastic deformation, buckling and self contact, look at this web page:-

http://www.rockfield.co.uk/packaging_cont.htm#

 

[brad]

I have seen some papers on this from Proctor & Gamble (who have a strong interest in this very analysis, for obvious reasons).

Google or yahoo on '"Proctor & Gamble" FEA' and you will get a lot of hits which may help.
Brad