Answer
Rayuwar gajiyawa tana nufin kewayon damuwa tsakanin farkon farkon farawa $H_1$ da tsayin aiki na ƙarshe $H_2$. Matsakaicin matsananciyar damuwa $\sigma_a$ an bayyana shi da $(\sigma_{max} - \sigma_{min}) / 2$, da ma'anar damuwa $\sigma_m$ kamar $(\sigma_{max} + \sigma_{min}) / 2$. Yin amfani da zane na Goodman, injiniyoyi dole ne su tabbatar da cewa batu $(\sigma_m, \sigma_a)$ ya ta'allaka ne a cikin yanki mai aminci don takamaiman kayan, kamar SAE 1070 Carbon Karfe. A cikin bawul ɗin ruwa mai ƙarfi, idan karkacewar $f$ ya zarce kashi 50 na tafiye-tafiyen da ake da shi, yuwuwar fara faɗuwar gajiya a raƙuman igiyoyin ruwa ko tudun ruwa yana ƙaruwa saboda ƙananan filasta. Daidaitaccen sarrafa tsayin aiki yana tabbatar da cewa damuwa ya kasance ƙasa da iyakar juriya $\sigma_e$.
