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Kitagawa‐Takahashi diagrams define the limiting conditions for cyclic fatigue failure in human dentin
Author(s) -
Kruzic J.J.,
Ritchie R.O.
Publication year - 2006
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.30939
Subject(s) - materials science , fatigue limit , limiting , fatigue testing , context (archaeology) , fracture (geology) , goodman relation , structural engineering , cyclic stress , stress (linguistics) , paris' law , fracture mechanics , stress concentration , composite material , crack closure , engineering , mechanical engineering , paleontology , linguistics , philosophy , biology
As cyclic fatigue is considered to be a major cause of clinical tooth fractures, achieving a comprehensive understanding of the fatigue behavior of dentin is of importance. In this note, the fatigue behavior of human dentin is examined in the context of the Kitagawa‐Takahashi diagram to define the limiting conditions for fatigue failure. Specifically, this approach incorporates two limiting threshold criteria for fatigue: (i) a threshold stress for fatigue failure, specifically the smooth‐bar (unnotched) fatigue endurance strength, at small crack sizes and (ii) a threshold stress‐intensity range for fatigue‐crack growth at larger crack sizes. The approach provides a “bridge” between the traditional fatigue life and fracture mechanics based damage‐tolerant approaches to fatigue‐life estimation, and as such defines a “failure envelope” of applied stresses and flaw sizes where fatigue failure is likely in dentin This approach may also be applied to fatigue failure in human cortical bone (i.e. clinical “stress fractures”), which exhibits similar fatigue behavior characteristics, and in principle may aid clinicians in making quantitative evaluations of the risk of fractures in mineralized tissues. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res, 2006