Answer
Ƙimar rayuwa ga gajiya don maɓuɓɓugan ruwan raƙuman ruwa ya ƙunshi ƙididdige madaidaicin damuwa $\sigma_a$ da ma'anar damuwa $\sigma_m$. Don bazarar igiyar ruwa, matsakaicin matsananciyar damuwa yana faruwa a kololuwar igiyoyin kuma ana ba da shi ta $\sigma = \ frac{3 \cdot π \cdot E \cdot t \cdot N^2 \ cdot f}{4 \cdot D_m^2 \cdot n}$. Yin amfani da dangantakar Goodman $\frac{\sigma_a}{\sigma_e} + \frac{\sigma_m}{\sigma_{ut}} = 1$, inda $\sigma_e$ shine iyakar jimiri kuma $\sigma_{ut}$ shine ƙarfin ƙarfin ƙarfi na ƙarshe (kimanin 1650-7 PH na injin injin zai iya tantance idan 1650-70MPa zai iya rayuwa idan 1950 MPa don 19 MPa). $10^6$ zagaye. A cikin manyan aikace-aikacen sake zagayowar kamar famfunan likitanci, muna nufin samun ma'anar aminci $ S_f> 1.2$. Dole ne a sauƙaƙa matsalolin da suka rage daga tsarin murɗawa ta hanyar magani mai zafi a $480^∘C$ don tabbatar da ma'anar damuwa ba ta motsawa yayin sabis.
