Ta yaya ake ƙididdige wahalar aiki a tsayin aiki don tabbatar da rayuwar gajiya a cikin maɓuɓɓugan ruwa na 17-7PH CH900?

Matsakaicin damuwa na aiki $\sigma$ yana faruwa a kololuwar raƙuman ruwa kuma ana bayar da shi ta $\sigma = \ frac{1.5 \pi P D_m C_f}{Z^2 b t^2}$, inda $C_f$ shine ma'auni na damuwa da ke da alaƙa da juzu'in raƙuman ruwa. Don bakin karfe 17-7PH a cikin yanayin CH900, ƙarfin jujjuyawar $UTS$ kusan $200-230$ ksi. Don tabbatar da rayuwar gajiya marar iyaka (sama da hawan keke $10^6$), damuwa mai aiki a iyakar jurewa dole ne a kiyaye shi ƙasa da iyakar juriyar gajiya, yawanci $45-50%$ na $UTS$ don mahalli marasa lalacewa. Idan aikace-aikacen ya ƙunshi hawan keke mai tsayi, yakamata a yi nazarin ma'auni na Goodman ko Gerber, yana tsara ma'anar damuwa $\sigma_m = (\sigma_{max} + \sigma_{min}) / 2$ a kan madaidaicin danniya $\sigma_a = (\sigma_{max} - \sigma_{max} - \sigma_{max})/2_{min}