Answer
Ƙarfin ƙwanƙwasa zoben riƙewa na karkace yawanci ana iyakance shi ta ƙarfin juzu'i na kayan tsagi maimakon zoben kanta. Ana ƙididdige nauyin abin da aka yarda da shi $ P_g $ ta amfani da dabarar $ P_g = \ frac {D d \pi \ sigma_y}{K S F}$, inda $ D$ shine diamita na shaft, $ d $ shine zurfin tsagi, $ \ sigma_y $ shine ƙarfin yawan amfanin ƙasa, kuma $ KSF$ shine yanayin aminci. Ga zoben da kansa, ƙarfin shear shine $P_r = \ frac{A \ tau \pi}{K S F}$, inda $A$ shine wurin shear kuma $\tau$ shine ƙarfin juzu'in kayan zobe. A cikin kayan laushi kamar aluminum, tsagi kusan koyaushe zai gaza farko ta hanyar 'dishing' ko nakasawa, wanda ke ba da damar zobe ya karkata kuma ya fito waje. Saboda haka, zurfafa tsagi ko yin amfani da kayan gida mai wuya ya fi tasiri fiye da yin amfani da zobe mai kauri.
