Official Answer
Answer
Ƙaƙwalwar ƙarar zobe $P_r$ an ƙaddara ta hanyar ɓangaren ɓangaren zobe wanda dole ne a yanke shi don ba da damar taron ya kasa axially. $P_r = frac{\pi \cdot D \cdot t \cdot S_s}{S_f}$, inda $t$ shine kaurin zobe kuma $S_s$ shine karfin juzu'in kayan zobe ($ S_s \kimanin 0.6 S_u$). A mafi yawan yanayin aikin injiniya ta amfani da alluna masu ƙarfi kamar 302 Bakin Karfe ko 17-7PH, $P_r$ ya zarce ƙarfin tsagi $P_g$. Saboda haka, ƙirar kwalban kusan koyaushe shine nakasar tsagi. Sai kawai a cikin lokuta tare da zobba na bakin ciki ($ t <0.020$ inci) da kuma kayan aiki mai ƙarfi na ƙarfe na gidaje yana sa zobe ya zama yanayin rashin nasara na farko.
