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Tangential shear of thick wall pipe - secondary effect - collapsse.

Tangential shear of thick wall pipe - secondary effect - collapsse.

Tangential shear of thick wall pipe - secondary effect - collapsse.

(OP)
Hello.
I would like to ask if there is a specific formula for calculating the internal stress of thick wall pipe subjected to shear in a plane perpendicular to the axis of the pipe.
Bellow you have attached the situation which I am trying to solve.The thick wall pipe is subjected to shear via the double link and the single link.My problem is that I need to find out some secondary effect like the circumferential distortion (ovalisation) and what is it's magnitude.
I am trying to get it solved in Ansys but I am getting trouble defining the contacts and constraints.Can someone help me out?
Thank you.

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