Cyclic fatigue crack propagation behavior of 9Ce-TZP ceramics with different grain size

Journal Article · Fri Oct 01 00:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb03987.x· OSTI ID:5726332

Liu, Tianshun; Mai, Yiu-Wang ^[1]

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1. Univ. of Sydney, New South Wales (Australia). Centre for Advanced Materials Technology, Dept. of Mechanical Engineering

Cyclic fatigue crack growth behavior has been investigated in 9 mol% Ce-TZP ceramics with grain sizes varying from 1.1 to 3.0 [mu]m. To ascertain the interaction between crack resistance curve behavior and cyclic fatigue crack growth, cyclic fatigue tests were conducted with short double-cantilever-beam specimens in two conditions: (a) with a sharp precrack without preexisting t-m transformation and (b) with a sharp crack after R-curve measurements, i.e., with preformed t-m transformation in the crack region. Fatigue crack propagation occurs at applied stress intensity factor values as low as about 40% of the K[sub I],[sub [infinity]] values measured in the R-curves. The size and shape of the t-m transformation zones are found to be different for specimens obtained i monotonic loading R-curve measurements and in cyclic fatigue tests. For the specimens without preexisting t-m transformation the overall crack growth behavior can be described by the Paris power law relation: da/dN = A[Delta]K[sup m][sub I] with m values of 15 for the 1.1-[mu]m grain size and between 8 and 9 for the material with larger grain sizes. For the specimens with the preformed transformation zone, a V shape da/dN versus [Delta]K[sub I] relation is obtained. Explanations for these different results in the two conditions are discussed in terms of crack tip shielding effects.

• OSTI ID: 5726332
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:10; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM OXIDES
CRACK PROPAGATION
GRAIN SIZE
ZIRCONIUM OXIDES
CERAMICS
FATIGUE
PHASE TRANSFORMATIONS
CERIUM COMPOUNDS
CHALCOGENIDES
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SIZE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360202 - Ceramics
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& Refractories- Structure & Phase Studies