Hi all,

I am fairly new to CosmosDesigner and I have been trying to modelthe behaviour of a body at 4000 m deep. Several points are not soclear to me:

1) How to insert the bulk modulus property in Solidworks 2006?

2) What would be a correct way to model the behaviour of a part/assembly under 400 bar pressure. I have tried on a simple part byapply a pressure to all the surfaces of the body, but I have tocheck 'use inertial relief' to make the modelling work (there is norestraint as the part is supposed to be immersed), is that correct?Furthermore, the displacement results given by Cosmos could beacceptable BUT I did not input any value for the bulk modulus andtherefore can't understand why the part is shrinking. Does Cosmosworks has a derived way to calculate this characteristic?

3) Ideally, I would like to be able to model the behaviour of mysystem (kind of container) under 2 conditions: pressurebalanced and not pressure balanced. As I have some opticalcomponents inside, I am interested in the displacement induced bythe pressure.

I hope I am clear enough, and I welcome any comment or suggestions.Any help would be greatly appreciated.

Best regards,

Cedric

I am fairly new to CosmosDesigner and I have been trying to modelthe behaviour of a body at 4000 m deep. Several points are not soclear to me:

1) How to insert the bulk modulus property in Solidworks 2006?

2) What would be a correct way to model the behaviour of a part/assembly under 400 bar pressure. I have tried on a simple part byapply a pressure to all the surfaces of the body, but I have tocheck 'use inertial relief' to make the modelling work (there is norestraint as the part is supposed to be immersed), is that correct?Furthermore, the displacement results given by Cosmos could beacceptable BUT I did not input any value for the bulk modulus andtherefore can't understand why the part is shrinking. Does Cosmosworks has a derived way to calculate this characteristic?

3) Ideally, I would like to be able to model the behaviour of mysystem (kind of container) under 2 conditions: pressurebalanced and not pressure balanced. As I have some opticalcomponents inside, I am interested in the displacement induced bythe pressure.

I hope I am clear enough, and I welcome any comment or suggestions.Any help would be greatly appreciated.

Best regards,

Cedric

Your model needs to be fully constrained without inertial relief, even though it is not actually attached to anything. if it were a submarine, I would put a restraint on the propeller axially, and the rudders in the other two directions. I don't know your specific application, but you should be able to figure out something that is actually 'restraining' or constraining it in real life. The only thing I can think of would be a full sphere that is too heavy to float and too light to sink to the bottom. With that I would probably constrain something internal, since you should have small forces anyway if your pressure is equal.

I think with the inertial relief on that your displacement may not be accurate, so I won't comment further on that until the restraints are in place correctly.