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Damage accumulation, fatigue and creep behaviour of vacuum mixed bone cement

Damage accumulation, fatigue and creep behaviour of vacuum mixed bone cement
Damage accumulation, fatigue and creep behaviour of vacuum mixed bone cement
The behaviour of bone cement under fatigue loading is of interest to assess the long-term in vivo performance. In this study, uniaxial tensile fatigue tests were performed on CMW-1 bone cement. Acoustic emission sensors and an extensometer were attached to monitor damage accumulation and creep deformation respectively. The S-N data exhibited the scatter synonymous with bone cement fatigue, with large pores generally responsible for premature failure; at 20 MPa specimens failed between 2×103 and 2×104 load cycles, while at 7 MPa specimens failed from 3×105 load cycles but others were still intact after 3×106 load cycles. Acoustic emission data revealed a non-linear accumulation of damage with respect to time, with increasing non-linearity at higher stress levels. The damage accumulation process was not continuous, but occurred in bursts separated by periods of inactivity. Damage in the specimen was located by acoustic emissions, and allowed the failure site to be predicted. Acoustic emission data were also used to predict when failure was not imminent. When this was the case at 3 million load cycles, the tests were terminated. Creep strain was plotted against the number of load cycles and a linear relationship was found when a double logarithmic scale was employed. This is the first time a brand of cement has been characterised in such detail, i.e. fatigue life, creep and damage accumulation. Results are presented in a manner that allows direct comparison with published data for other cements. The data can also be used to characterise CMW-1 in computational simulations of the damage accumulation process. Further evidence is provided for the condition-monitoring capabilities of the acoustic emission technique in orthopaedic applications.
bone cement, fatigue, creep, damage accumulation, acoustic emission
0142-9612
5532-5541
Jeffers, Jonathan R.T.
806cf62c-09d6-460e-a864-7c24ee5f1bf2
Browne, Martin
299b9ea0-bfa5-4c84-b30f-baa8e11e0200
Taylor, Mark
e368bda3-6ca5-4178-80e9-41a689badeeb
Jeffers, Jonathan R.T.
806cf62c-09d6-460e-a864-7c24ee5f1bf2
Browne, Martin
299b9ea0-bfa5-4c84-b30f-baa8e11e0200
Taylor, Mark
e368bda3-6ca5-4178-80e9-41a689badeeb

Jeffers, Jonathan R.T., Browne, Martin and Taylor, Mark (2005) Damage accumulation, fatigue and creep behaviour of vacuum mixed bone cement. Biomaterials, 26 (27), 5532-5541. (doi:10.1016/j.biomaterials.2005.02.009).

Record type: Article

Abstract

The behaviour of bone cement under fatigue loading is of interest to assess the long-term in vivo performance. In this study, uniaxial tensile fatigue tests were performed on CMW-1 bone cement. Acoustic emission sensors and an extensometer were attached to monitor damage accumulation and creep deformation respectively. The S-N data exhibited the scatter synonymous with bone cement fatigue, with large pores generally responsible for premature failure; at 20 MPa specimens failed between 2×103 and 2×104 load cycles, while at 7 MPa specimens failed from 3×105 load cycles but others were still intact after 3×106 load cycles. Acoustic emission data revealed a non-linear accumulation of damage with respect to time, with increasing non-linearity at higher stress levels. The damage accumulation process was not continuous, but occurred in bursts separated by periods of inactivity. Damage in the specimen was located by acoustic emissions, and allowed the failure site to be predicted. Acoustic emission data were also used to predict when failure was not imminent. When this was the case at 3 million load cycles, the tests were terminated. Creep strain was plotted against the number of load cycles and a linear relationship was found when a double logarithmic scale was employed. This is the first time a brand of cement has been characterised in such detail, i.e. fatigue life, creep and damage accumulation. Results are presented in a manner that allows direct comparison with published data for other cements. The data can also be used to characterise CMW-1 in computational simulations of the damage accumulation process. Further evidence is provided for the condition-monitoring capabilities of the acoustic emission technique in orthopaedic applications.

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More information

Published date: 2005
Keywords: bone cement, fatigue, creep, damage accumulation, acoustic emission

Identifiers

Local EPrints ID: 23424
URI: http://eprints.soton.ac.uk/id/eprint/23424
ISSN: 0142-9612
PURE UUID: 79609130-1f59-40e1-a718-8c824a4b501f

Catalogue record

Date deposited: 17 Mar 2006
Last modified: 15 Mar 2024 06:47

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Contributors

Author: Jonathan R.T. Jeffers
Author: Martin Browne
Author: Mark Taylor

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