Official Answer
Answer
Ubuzima bw'umunaniro bubarwa ukoresheje isano ya Goodman cyangwa igipimo cya Gerber. Kuri 17-7PH CH900, guhangayikishwa no gukora $ \ sigma $ bibarwa nka $ \ sigma = \ frac {3 \ pi P D_m} {4 b t ^ 2 N ^ 2} $. Guhinduranya $ Impamvu z'umutekano $ n_f $ zitangwa na $ \ frac {1} {n_f} = \ frac {\ sigma_a} {S_e} + \ frac {\ sigma_m} {S_u} $. Kubisabwa byizunguruka cyane ($> 10 ^ 6 $ cycle), guhangayikishwa cyane ntigomba kurenga 50% byingufu ntoya kugirango ubaze ingaruka zirangirira hamwe nibishobora gusigara biturutse kumurongo.
