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2012, vol. 10, br. 1, str. 7-14
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Fraktografsko ispitivanje loma ortopedskih pločica od nerđajućeg čelika
Fractographic investigation of failure in stainless steel orthopedic plates
aUniverzitet u Nišu, Mašinski fakultet bUniverzitet u Nišu, Medicinski fakultet
e-adresa: dulep@masfak.ni.ac.rs
Projekat: Mikromehanički kriterijumi oštećenja i loma (MPNTR - 174004)
Sažetak
Pločice od austenitnog nerđajućeg čelika često se koriste za učvršćivanje krajeva polomljenih kostiju i saniranje preloma u ortopedskoj hirurgiji. U radu je analiziran prevremeni lom šest pločica za fiksaciju polomljenih kostiju kod različitih pacijenata. Svaki lom pločice može prouzrokovati ozbiljne posledice, kao što su: nova operacija, neočekivane neželjene komplikacije i produženi period ozdravljenja. U cilju istraživanja loma pločica, izvedeno je ispitivanje hemijskog sastava i tvrdoće čelika, metalografsko ispitivanje, kao i makro i mikro fraktografsko ispitivanje površine loma pločica, pomoću optičkog i elektronskog mikroskopa. Na osnovu rezultata ispitivanja može se zaključiti da je lom nastao usled zamora čelika sa visokim statičkim opterećenjem, bez prisustva korozije.
Abstract
Plates of austenitic stainless steel are often used in orthopedic surgery for fixing ends of the broken bones and for repairing fractures. The paper analyzes a premature breakage of six plates for fixing broken bones with different patients during their recovery. Each plate's breakage can induce serious aftermaths such as a new surgery, unexpected undesired complications and a prolonged healing time. The research of the plate breakage required an examination of the chemical composition and steel hardness, metallographic examination as well as that of the plate breakage surface by means of macroscopic and microscopic fractographic observations using stereomicroscope and scanning electron microscope. On the basis of the results it can be concluded that the breakage was caused by steel wear with a high static load and with no corrosion.
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Reference
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