Fatigue Life Estimation Procedures for the Endurance of a Cardiac Valve Prosthesis: Stress/Life and Damage-Tolerant Analyses

[+] Author and Article Information
R. O. Ritchie

Department of Materials Science and Mineral Engineering, University of California, Berkeley, Calif. 94720

P. Lubock

Mechanical Heart Valves, Cardiovascular Division, Shiley, Inc., Irvine, Calif. 92714

J Biomech Eng 108(2), 153-160 (May 01, 1986) (8 pages) doi:10.1115/1.3138595 History: Received May 21, 1985; Revised December 16, 1985; Online June 12, 2009


Projected fatigue life analyses are performed to estimate the endurance of a cardiac valve prosthesis under physiological environmental and mechanical conditions. The analyses are conducted using both the classical stress-strain/life and the fracture mechanics-based damage-tolerant approaches, and provide estimates of expected life in terms of initial flaw sizes which may pre-exist in the metal prior to the valve entering service. The damage-tolerant analysis further is supplemented by consideration of the question of “short cracks,” which represents a developing area in metal fatigue research, not commonly applied to data in standard engineering design practice.

Copyright © 1986 by ASME
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