Official Answer
Answer
Dandeettiin dhiibbaa eksaayilii cirracha gilgaala irratti hundaa’e akka $P_r = \frac{D t \pi S_s}{K}$tti shallagama yoo ta’u $D$ daayameetira shaafta/boorii, $t$ furdina gilgaala, $S_s$ cimina cirrachaa meeshaa gilgaala, fi $K$ sababa nageenyaa (yeroo baay’ee 3) dha. Sibiilota birraa baay’eedhaaf, $S_s \approx 0.6 \times S_{ut}$ (cimina harkisaa dhumaa). $P_r$ (ring shear) fi $P_g$ (groove yield) walbira qabuun murteessaadha. Gatiin gadii daangaa sirnichaa murteessa. Fayyadama dhiibbaa guddaa qabu keessatti, $K$ gara 5 fi isaa ol guddachuu qaba, fe'iinsa daayinamikii fi dadhabbiin walqunnamtii groove irratti ta'uu danda'u herregaaf.
