Answer
Dhiibbaan dhaabbii kan uumamu yeroo girgiddaan shaafta irratti babal’atu ykn gara booraatti walitti qabamudha. Dhiibbaan akka $\sigma_{inst} = _x000c_rac{4 imes E imes yeroo dheerina{Babal'ina}}{D_m^2}$ jedhamee shallagama. Dhiibbaan kun humna oomishaa meeshaa sanaa caalu hin qabu, kunis difoormeeshinii dhaabbataa akka hin uumamneef. 'Modulus of Resilience' ($U_r = _x000c_rac{\sigma_y^2}{2E}$) dandeettii meeshaan sun anniisaa elastikiidhaan xuuxuu bakka bu'a. A material with a high $U_r$, like 17-7PH, can be expanded significantly more than a material with a lower $U_r$, like 316 Stainless, before taking a set. If the required expansion for installation exceeds the material's elastic limit, the ring must be designed with a larger free diameter or a multi-turn configuration to distribute the strain.
