Influence of circumferential notch and fatigue crack on the mechanical integrity of biodegradable magnesium-based alloy in simulated body fluid.

Authors :: Bobby Kannan M
Singh Raman RK
Witte F
Blawert C
Dietzel W
Source :: Journal of biomedical materials research. Part B, Applied biomaterials [J Biomed Mater Res B Appl Biomater] 2011 Feb; Vol. 96 (2), pp. 303-9. Date of Electronic Publication: 2010 Dec 17.
Publication Year :: 2011
Abstract: Applications of magnesium alloys as biodegradable orthopaedic implants are critically dependent on the mechanical integrity of the implant during service. In this study, the mechanical integrity of an AZ91 magnesium alloy was studied using a constant extension rate tensile (CERT) method. The samples in two different geometries that is, circumferentially notched (CN), and circumferentially notched and fatigue cracked (CNFC), were tested in air and in simulated body fluid (SBF). The test results show that the mechanical integrity of the AZ91 magnesium alloy decreased substantially (∼50%) in both the CN and CNFC samples exposed to SBF. Fracture surface analysis revealed secondary cracks suggesting stress corrosion cracking susceptibility of the alloy in SBF.<br /> (Copyright © 2010 Wiley Periodicals, Inc.)

Subjects :: Body Fluids
Corrosion
Tensile Strength
Absorbable Implants
Alloys chemistry
Magnesium
Materials Testing methods
Mechanical Phenomena

Language :: English
ISSN :: 1552-4981
Volume :: 96
Issue :: 2
Database :: MEDLINE
Journal :: Journal of biomedical materials research. Part B, Applied biomaterials
Publication Type :: Academic Journal
Accession number :: 21210510
Full Text :: https://doi.org/10.1002/jbm.b.31766

Full Text Access

Tools