THRESHOLD SIZE FOR CYCLIC FATIGUE-CRACK PROPAGATION IN A PYROLYTIC CARBON

Authors
MA L SINES G
Citation
L. Ma et G. Sines, THRESHOLD SIZE FOR CYCLIC FATIGUE-CRACK PROPAGATION IN A PYROLYTIC CARBON, Materials letters, 17(1-2), 1993, pp. 49-53
Citations number
7
Categorie Soggetti
Material Science","Physics, Applied
Journal title
Materials letters → ACNP
ISSN journal
0167577X
Volume
17
Issue
1-2
Year of publication
1993
Pages
49 - 53
Database
ISI
SICI code
0167-577X(1993)17:1-2<49:TSFCFP>2.0.ZU;2-2
Abstract
An isotropic, pyrolytic carbon is the favored material for mechanical heart valve components. The question has been raised on the size of th e threshold crack length for cyclic fatigue crack propagation. Prelimi nary results are presented that indicate that the threshold length is of the order of a millimeter at the estimated service stresses. Long l ife tests also show no fatigue crack initiation in uncracked specimens . Elastic properties and fracture toughness results are also reported.