Ta yaya 'Cyclic Axial Loading' ke haifar da gazawar gajiya a cikin zoben riƙe da karkace?

Duk da yake ana ɗaukar zoben riƙewa sau da yawa a tsaye, za su iya samun gajiya idan ɓangaren da aka riƙe ya ​​shafi nauyin axial na cyclic (misali, a cikin taron piston). Tsagewar gajiya yawanci yana farawa ne a gefen zoben na ciki saboda lokacin lanƙwasawa da aka ƙirƙira azaman 'jita-jita' zobe a cikin tsagi. Matsakaicin damuwa $Δ\sigma$ yana ƙayyade ta wasan tsakanin zobe da tsagi. Idan tsagi ya yi fadi da yawa, zobe na iya 'gudu' a bango, yana ƙara ƙarfin damuwa. Binciken SEM yawanci yana nuna 'striations' halayen gajiya. Don hana wannan, ya kamata a tsara taron tare da ƙaramin wasan ƙarshen axial, kuma ya kamata a haɓaka kayan zobe zuwa 17-7PH don ƙimar gajiya mafi girma.