Cyclic Fatigue Life and Crack‐Growth Behavior of Microstructurally Small Cracks in Magnesia‐Partially‐Stabilized Zirconia Ceramics

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1259-1268
Journal / PublicationJournal of the American Ceramic Society
Volume74
Issue number6
Online publishedJun 1991
Publication statusPublished - Jun 1991
Externally publishedYes

Abstract

Cyclic fatigue stress/life (S/N) and crack‐growth properties are investigated in magnesia‐partially‐stabilized zirconia (Mg‐PSZ), with particular reference to the role of crack size. The material studied is subeutectoid aged to vary the steady‐state fracture toughness, Kc, from ∼3 to 16 MPa·m1/2·S/N data from unnotched specimens show markedly lower lives under tension—compression compared with tension—tension loading; “fatigue limits” (at 108 cycles) for the former case approach 50% of the tensile strength. Under tension—tension loading, cyclic crack‐growth rates of “long” (> 3 mm) cracks are found to be power‐law dependent on the stress‐intensity range, ΔK, with a fatigue threshold, ΔKTH, of order 50% of Kc. Conversely, naturally occurring “small” (1 to 100 μm) surface cracks are observed to grow at ΔK levels 2 to 3 times smaller than ΔKTH, similar to behavior widely reported for metallic materials. The observed small‐crack behavior is rationalized in terms of the restricted role of crack‐tip shielding (in PSZ from transformation toughening) with cracks of limited wake, analogous to the reduced role of crack closure with small fatigue cracks in metals. The implications of such data for structural design with ceramics are briefly discussed. Copyright © 1991, Wiley Blackwell. All rights reserved

Research Area(s)

  • crack growth, cyclic fatigue, fracture, magnesia, zirconia: partially stabilized (PSZ)

Citation Format(s)

Cyclic Fatigue Life and Crack‐Growth Behavior of Microstructurally Small Cracks in Magnesia‐Partially‐Stabilized Zirconia Ceramics. / Steffen, Angela A.; Dauskardt, Reinhold H.; Ritchie, Robert O.

In: Journal of the American Ceramic Society, Vol. 74, No. 6, 06.1991, p. 1259-1268.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review