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TECHNICAL PAPERS: Bone/Orthopedic

Creep Does Not Contribute to Fatigue in Bovine Trabecular Bone

[+] Author and Article Information
T. L. A. Moore

Exponent Failure Analysis Associates, Philadelphia, PA 19106

F. J. O’Brien

Department of Anatomy, Royal College of Surgeons in Ireland, Dublin 2, Ireland

L. J. Gibson

Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J Biomech Eng 126(3), 321-329 (Jun 24, 2004) (9 pages) doi:10.1115/1.1762892 History: Received June 16, 2003; Revised December 04, 2003; Online June 24, 2004
Copyright © 2004 by ASME
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References

Figures

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(a) Stress strain loops for a fatigue test at a normalized stress of 0.0095, illustrating the definitions of secant modulus and residual strain. For clarity, they are illustrated on the second to last cycle of loading in the fatigue test. The residual strains listed in Table 1 are for the cycle corresponding to ESEC/Eo=0.90. For this specimen Nf(at Esec/Eo=0.90)=1 and Nf final=14. (b) Secant modulus, Esec/Eo, plotted as a function of the number of cycles of loading, N, for the fatigue test in (a). (c) Stress-strain loops for a fatigue test at a normalized stress of 0.0075. For this specimen Nf(at Esec/Eo=0.90)=1 and Nf final=168. (d) Secant modulus, Esec/Eo, plotted as a function of the number of cycles of loading, N, for the fatigue test in (c).
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Normalized stress versus number of cycles to failure curve for fatigue specimens loaded to failure (corresponding to Esec/Eo=0.90).
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Residual strain at failure (corresponding to Esec/Eo=0.90) in the fatigue tests and upper bound estimate of creep strain at failure plotted against normalized stress.
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Time to failure (corresponding to Esec/Eo=0.90) measured in the fatigue tests and lower bound estimate of time to failure for creep at the maximum normalized stress in the fatigue test, plotted against normalized stress.
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Residual strain at the end of the fatigue test (at either specimen fracture or when 5% strain was reached) and upper bound estimate of creep strain at failure plotted against normalized stress.
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Time to failure (at either specimen fracture or when 5% strain was reached) measured in the fatigue tests and lower bound estimate of time to failure for creep at the maximum normalized stress in the fatigue test, plotted against normalized stress.

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