How can I define "Critical Stresses in a Circular Ring"?

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s. Béatrice Marianne Ewalds-Kvist

Dear Awani,

Check out how it is defined in this papers:

Article Stresses and displacements in a circular ring under paraboli...

Article Stresses and displacements in a circular ring loaded by symm...

Article Critical Stresses in a Circular Ring

Martin Lindhardt Nielsen

To RG edítors: This question does not belong to "Work stress", but rather to engineering or material physics.