Answer
Dandeettiin cirrachaa gilgaala $P_r$ fe’umsa gingilchaan qabachuu mataan isaa cirrachaan itti kufedha. Innis akka $P_r = _x000c_rac{D imes t imes au_s imes ext{Safety Factor}}{\phi}$ jedhamee shallagama bakka $t$ furdina gilgaala fi $\tau_s$ cimina cirrachaa meeshaa gilgaala (akkaataa idileetti $0.6 \times \text{cimina harkisaa}$). Cirrachi gilgaala kan daangessu ta’a, yeroo girgiddaan meeshaa cimina baay’ee ol’aanaa qabu irraa hojjetame (fkn, sibiilli meeshaa jabaate) ykn furdinni gilgaala gad fageenya qodaa wajjin walqabatee baay’ee xiqqaa ta’e. Irra caalaan manneen 'lallaafaa' kan akka Aluminiyeemii ykn Sibiilli Kaarboonii istaandaardii keessatti, osoo gingilchaan hin cicciriin dura yeroo dheeraaf, 'groove'n oomisha ni kenna. Gingilchaalee aerospace 17-7PH tiif, $\tau_s$ $150,000$ PSI ol ta'uu danda'a.
