Official Answer
Answer
Kunanirwa k'umunaniro mubisanzwe bibaho kumurongo wimbere (diameter y'imbere cyangwa hanze) aho guhangayika ari byinshi. Kugirango dusesengure ibi, dukoresha ikigereranyo cya Goodman: $ _x000c_rac {S_a} {S_e} + _x000c_rac {S_m} {S_u} = _x000c_rac {1} {FS} $, aho $ S_a $ aribwo buryo bwo guhinduranya $ $ (S_ {max} + S_ {min}) / 2 $, $ S_e $ ni imipaka yo kwihangana, kandi $ S_u $ ni imbaraga zidasanzwe. Niba isoko yumuraba inaniwe imburagihe, SEM (Scanning Electron Microscopy) ikoreshwa mugushakisha 'ibimenyetso byinyanja' hamwe na striations. Kunanirwa kwinshi guturuka kuri $ S_a $ kuba hejuru cyane, akenshi biterwa nubwonko budasuzuguritse cyangwa kubura preload, bigatuma isoko idashobora 'gufata' cyangwa kunyeganyega bikabije.
