Pressure Distribution before and after O-Ring seal
Pressure Distribution before and after O-Ring seal
(OP)
Hey guys,
I'm modeling an adapter that will go inside of a pressure vessel holding 2500psi. The adapter is basically a cylindrical piece and it will be threaded into the wall of the pressure vessel. It will be submerged in water, thus bringing the need for various o-ring seals.
My question is - is there a good way for modelling the pressure distribution on the cylindrical faces before and after the oring seal? The area looks like this:
face O face
ring
---------^^^^^^^------------
maybe the left face would see 2500psig, and if the oring is holding up correctly, the back face will see 0psig? Is this a reasonable assumption when conducting an fea? I am simply concerned about the life of this adapter, but I am having trouble figuring out the most realistic distribution of this pressure. Thanks
I'm modeling an adapter that will go inside of a pressure vessel holding 2500psi. The adapter is basically a cylindrical piece and it will be threaded into the wall of the pressure vessel. It will be submerged in water, thus bringing the need for various o-ring seals.
My question is - is there a good way for modelling the pressure distribution on the cylindrical faces before and after the oring seal? The area looks like this:
face O face
ring
---------^^^^^^^------------
maybe the left face would see 2500psig, and if the oring is holding up correctly, the back face will see 0psig? Is this a reasonable assumption when conducting an fea? I am simply concerned about the life of this adapter, but I am having trouble figuring out the most realistic distribution of this pressure. Thanks






RE: Pressure Distribution before and after O-Ring seal
if the O-ring seat has been designed correctly, then your assumption is correct and is commonly used in the field I work in (Hydraulic turbomachinery).
___
____|O|______
!
2500 ! 0 psi
You will have to check, after your FEA, that the deformations are not such as to "de-compress" the O-ring more than what is allowed for this pressure. O-ring manufacturers have tables or diagrams for that.
Regards
RE: Pressure Distribution before and after O-Ring seal
sorry, I didn't preview the post, so the "schema" was almost unreadable:
___
_____|O|______
!
2500 ! 0 psi
I hope now it is clearer.
Regards
RE: Pressure Distribution before and after O-Ring seal
I think my analysis is going very well! I modelled the contact faces before the oring to be node-to-node because they share the total face, but the small face after the o-ring is sharing a very deep surface so I modelled it as a surface contact. The displacement of the oring faces seem to be a resultant .001 in. I'm going to have look into it further but this preliminary analysis seems to be accurate.
RE: Pressure Distribution before and after O-Ring seal
The pressure of 2500 psi would be sufficient to cause the oring to assume the shape of the cavity. I worked on hydraulic pumps for 20 years.