Pressure differential 3

[DRSEngineer]

I am a fairly new engineer, recently graduated. I have been given a pressure vessel problem and I need some help. We have a dome shaped lens with a small lip which gives us a certain surface area to which we apply the adhesive. Currently the adhesive has been failing at 40,000 ft. I need to find the PSI inside the lens at 40,000 ft above sea level, so I can determine a proper adhesive to use. Can anyone direct me to the proper equations that will help me determine the PSI acting on the domed lens?

 

[rb1957]

15psi is an awfull big pressure ... is the lens on a box sealed at SL ?

 

[DRSEngineer]

I will verfiy the internal pressure with my supervisor but is the rest of my reasoning correct?

 

[BobM3]

I need a sketch. Does the enclosed show your mounting? If so, then the equations shown would apply.

 

[DRSEngineer]

Bob,

Here is a sketch of my lense. Its pretty close except for the lip. I have a feeling your equation will work.

 

[DRSEngineer]

Sorry uploaded the wrong file!!!

 

[BobM3]

Yes, the equations will work for that. To be safe, I'd assume that Di = De unless you're pretty sure the internal pressure isn't acting on the contact area of the epoxy.