Official Answer
Answer
Gingilchaan qabannaa ispiraalii kan dhaabamu kooyilota babal’isuun gara 'groove'tti 'winding' gochuudhaani. Dhaabbataan akka hin saagamneef, ringiin daangaa elastikii isaa ol babal’achuu hin qabu. Babal’inni guddaan $S_{max}$ dhiibbaa faayibaraa $\sigma = \frac{E t (D_g - D_f)}{(D_f)(D_g)}$ bakka $D_g$ daayameetira qoochoo fi $D_f$ daayameetira bilisaa ta’een daangeffama. Raabsa walqixaa dhiibbaa babal’ina mirkaneessuuf walgahii ulfaatina guddaadhaaf mandrel dhaabbii ykn sleeve tapered fayyadamuun ni gorfama. Yoo girgiddaan akka $\sigma > S_{yield}$tti garmalee babal'ate, gingilchaan cimsee gara boollaatti hin deebi'u, dandeettii fe'umsa dhiibbaa isaa $P_a = \frac{D d S_y \pi}{K}$ hir'isa.
