Official Answer
Answer
Ƙarshen saman, musamman a gefuna na ciki da na waje na zoben karkace, yana aiki azaman jerin ƙananan ƙira. Ƙarshen ƙaƙƙarfan ƙaƙƙarfan (Ra> 1.6 \mu m) yana ƙara ma'anar damuwa $K_t$, yana haɓaka ƙaddamarwar fashewa a ƙarƙashin nauyin axial cyclic. Hakazalika, idan tsagi yana da alamun kayan aiki daga madaidaicin lathe bit, waɗannan sun zama wuraren farawa don 'tsagi'. A cikin aikace-aikacen babban zagayowar (misali, $10^7$ hawan keke), sau da yawa zobba suna girgiza don cimma daidaitaccen tsari, ƙarewa (Ra 0.4-0.8 \ mu m), wanda ke jujjuya madaidaicin S-N zuwa sama, bin alaƙar $ \ sigma_a = \ sigma_f'(2N_f)^b$.
