Official Answer
Answer
Ubuso burangije, cyane cyane kumbere ninyuma yimpeta izenguruka, ikora nkurukurikirane rwa micro-notches. Kurangiza bikabije (Ra> 1.6 \ mu m) byongera ibintu byo guhangayikisha $ K_t $, byihutisha gutangira munsi yumutwaro wikurikiranya. Mu buryo nk'ubwo, niba igikoni gifite ibimenyetso byerekana ibikoresho biva mu musarani utuje, ibi bihinduka urubuga rwo gutangiriraho 'gutobora'. Mubisabwa byizunguruka cyane (urugero, $ 10 ^ 7 $ cycle), impeta akenshi ziranyeganyega kugirango zigere ku ndunduro nziza, yataye umurongo (Ra 0.4-0.8 \ mu m), ihindura cyane umurongo wa S-N hejuru, ukurikije umubano $ \ sigma_a = \ sigma_f '(2N_f) ^ b $.
