Bottle analysis

[eltioseba]

I

 

[Israr]

create bottle and cap both using thin features, shell both(inside mechanica)and then assemble both. Fill the gap inside mechanica.


Now use 3 point constraint technique, apply pressure load.


In the second convert thin to solid to accomodate variable thichness and run again using solid mesh.


I hope this is enough help.


Israr

 

[clucker462]

eltiseba,

I have been modeling the same thing for quite some time now. This is the way that I have been doing it:

1. Model the bottle in standard, and shell the bottle, but do not remove the top surface, let it there. I do this because I am assuming that the cap is infinetly strong enough to hold the pressure load
2. In mechanica, add a constraint to the top surface and hold it fixed. Goes back to my assumption that the cap is infinetly strong.
3. Add a pressure load to all the internal surfaces of the bottle and then run the analysis.

The only problem with this method is that I am not taking into account the variable thickness of the bottle, but when I have been setting up my models, I have been shelling them to the min wall thickness. This is fairly simple method, but I have been getting pretty good results as far as deflection and stress compared to the actual parts.

 

[eltioseba]

Thanks for the answers, what I