Fatigue-Crack Growth in the Superelastic Endovascular Stent Material Nitinol
Tóm tắt
This paper describes a study of fatigue-crack propagation behavior in the superelastic alloy Nitinol. This work is motivated by biomedical applications, and the current interest to improve the design and performance of medical stents for implantation in the human body. Specifically, the objective of this work is to study the effect of environment on cyclic crack- growth resistance in a ~50Ni-5OTi (at. %) alloy, and to provide the necessary data for the safe life predication of Nitinol endovascular stents. The material selected for this study has been heat treated such that it is superelastic at human body temperature. Characterization of fatigue-crack growth rates has been performed at 37°C on disc-shaped compact-tension samples, in environments of air, aerated deionized water, and aerated Hank’s solution. Results indicate that, in fact, Nitinol has the lowest fatigue-crack growth resistance of metallic alloys currently used for implant-applications.
Tài liệu tham khảo
W. J. Buehler and R. C. Wiley, U.S. Patent No. 3 174 851 (1965).
C. M. Jackson, H. J. Wagner and R. J. Wasilewski, Report No. NASA-SP 5110, National Aeronautics and Space Administration (1972).
T. Saburi and C. M. Wayman, Acta Metall. 27, 979 (1979).
C. M. Wayman and T. W. Duerig, in Engineering Aspects of Shape Memory Alloys, edited by T. W. Duerig, K. N. Melton, D. Stockel and C. M. Wayman (Butterworth Heinemann, London, 1990), p. 3.
T. A. M. Chuter, C. E. Donayre and R. A. White, Endoluminal Vascular Prostheses, (Little, Brown and Company, Boston, 1995).
J. E. Bramfitt and R. L. Hess, in SMST-94, edited by A. R. Pelton, D. Hodgson and T. Duerig (First Intl. Conference on Shape-Memory and Superelastic Technologies Proc., Monterey, 1994) pp. 435–442.
T. W. Duerig, A. R. Pelton and D. Stockel, Metall 50, 569 (1996).
R. O. Ritchie, J. Heart Valve Disease 5, S9 (1996).
R. H. Dauskardt, T. W. Duerig and R. O. Ritchie, in Shape Memory Materials, edited by K. Otsuka and K. Shimizu (Mater. Res. Soc. Proc. 9, Pittsburgh, PA, 1989) pp. 243–249.
S. Miyazaki, M. Suizu, K. Otsuka and T. Takashima, in Shape Memory Materials, edited by K. Otsuka and K. Shimizu (Mater. Res. Soc. Proc. 9, Pittsburgh, PA, 1989) pp. 263–268.
K. N. Melton and O. Mercier, Acta Metall. 27, 137 (1979).
R. O. Ritchie, Mater. Sci. Eng. A 103, 15 (1988).
G. B. Olson and M. Cohen, Metall. Trans. A 7, 1897 (1976).
E. Hombogen, Acta Metall. 26, 147 (1978).
R. C. Garvie, R. J. H. Hannink and C. Urbani, Ceramurgia International 6, 19 (1980).
D. L. Porter and A. H. Heuer, J. Am. Ceram. Soc. 60, 183 (1977).
F. F. Lange, J. Mater. Sci. 17, 225 (1982).
A. H. Heuer, N. Claussen, W. M. Kriven and M. Ruhle, J. Am. Ceram. Soc. 65, 642 (1982).
M. V. Swain, R. C. Garvie and R. H. Hannink, J. Am. Ceram. Soc. 66, 358 (1983).
R. J. Hannink, J. Mater. Sci. 13, 2487 (1978).
A. G. Evans and R. M. Cannon, Acta Metall. 34, 761 (1986).
Z. Mei and J. W. Morris, Jr., Metall. Trans. A 21, 3137 (1990).
R. H. Dauskardt, D. B. Marshall and R. O. Ritchie, J. Am. Ceram. Soc. 73, 893 (1990).
R. M. McMeeking and A. G. Evans, J. Am. Ceram. Soc. 65, 242 (1982).
B. Budiansky, J. W. Hutchinson and J. C. Lambropoulos, Intl. J. Sol. Struc. 19, 337 (1983).
S. Suresh, Fatigue of Materials, 1st ed. (Cambridge University Press, New York, 1991) p. 356.