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

Bobby Mathan, Raman Singh, F Witte, Carsten Blawert, Wolfgang Dietzel

Research output: Contribution to journalArticleResearchpeer-review

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.
Original languageEnglish
Pages (from-to)303 - 309
Number of pages7
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume96B
Issue number2
DOIs
Publication statusPublished - 2011

Cite this

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title = "Influence of circumferential notch and fatigue crack on the mechanical integrity of biodegradable magnesium-based alloy in simulated body fluid",
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.",
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journal = "Journal of Biomedical Materials Research - Part B Applied Biomaterials",
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Influence of circumferential notch and fatigue crack on the mechanical integrity of biodegradable magnesium-based alloy in simulated body fluid. / Mathan, Bobby; Singh, Raman; Witte, F; Blawert, Carsten; Dietzel, Wolfgang.

In: Journal of Biomedical Materials Research - Part B Applied Biomaterials, Vol. 96B, No. 2, 2011, p. 303 - 309.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Influence of circumferential notch and fatigue crack on the mechanical integrity of biodegradable magnesium-based alloy in simulated body fluid

AU - Mathan, Bobby

AU - Singh, Raman

AU - Witte, F

AU - Blawert, Carsten

AU - Dietzel, Wolfgang

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

UR - http://eprints.jcu.edu.au/15913/

U2 - 10.1002/jbm.b.31766

DO - 10.1002/jbm.b.31766

M3 - Article

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SP - 303

EP - 309

JO - Journal of Biomedical Materials Research - Part B Applied Biomaterials

JF - Journal of Biomedical Materials Research - Part B Applied Biomaterials

SN - 1552-4973

IS - 2

ER -