Evaluating the statistical significance of a fatigue-life reduction due to macro-porosity
Bižal, Ana, 1983- ; Klemenc, Jernej ; Fajdiga, Matija
V strojni industriji je težnja po zmanjševanju teže konstrukcij odprla pot uporabi ulitkov iz aluminijevih zlitin kot alternativo jeklu. Medtem ko so dobre mehanske lastnosti, cenovno ugodne ...proizvodnje tehnologije in možnost recikliranja utrjevale položaj aluminijevih so vedno bolj prihajale do izraza tudi njihove slabe lastnosti. Ulitki so namreč podvrženi pojavu nehomogenosti v strukturi. Kljub temu, da je njihova prisotnost navadno razlog za padec zdržljivostnih sposobnosti ulitka, pa se nehomogenostim v celoti ne moremo izogniti. Pri ulitkih so najbolj kritične tiste nehomogenosti, ki so posledica tehnološkega procesa, saj so navadno večje od ostalih, mikro strukturnih značilnosti ulitka (hrapavost površine, mikrostruktura, mikro-poroznost, itn.). Najbolj nevarna tipa nehomogenosti pri ulitkih sta poroznost in vključki.
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