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Thread stress of pressurized valve cap

wolfours

Mechanical
Jan 16, 2025
1
Hi guys.
I need help approaching this problem.
Hope you like my paint illustration.

What you see is a valve body made of aluminium. This is a small part of the valve but I'm right now focusing on the structural integrity of the brass cap/aluminium body threads. My goals is to investigate the stress induced on the threads and calculate a roughly approximated safety factor.
For a given thread size, pre-torque and internal pressure, what stress can be found in the threads of the cap?
I'm asking for help with the METHOD of calculating it by hand, therefore I have not included all data. I'm just out for estimates.
 

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