Answer
Gajiya mai ƙarfi a cikin maɓuɓɓugan ruwan raƙuman ruwa yakan faru ne lokacin da bazara ba wai kawai an matsa ta axially ba amma kuma an juyar da ita zuwa lokacin murɗawa. Wannan yana faruwa idan abubuwan haɗin haɗin gwiwa suna jujjuya su cikin sauri daban-daban ko kuma idan akwai gagarumin rawar jiki. Yanayin damuwa ya zama hadaddun: $σ_{total} = σ_{axial} + τ_{torsional}$. Rashin gazawa yana bayyana azaman tsagewar da ke farawa a ciki ko na waje na raƙuman ruwa, inda yawan damuwa ya fi girma. Yin amfani da SEM (Scanning Electron Microscope), mutum zai lura da 'striations' halayen gajiya. Don hana wannan, ya kamata a 'maɓalli' ruwan bazara ko kuma dole ne a sami isassun juzu'i don hana juyawar dangi. Amfani da kayan da ke da iyakar gajiya, kamar Inconel 718, da kuma tabbatar da ƙarewar gefen santsi (deburring) suna da mahimmancin ragewa.
