Abstract
Cyclic fatigue crack growth behavior has been investigated in 9 mol% Ce‐TZP ceramics with grain sizes varying from 1.1 to 3.0 μm. 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 KI,∞ values measured in the R‐curves. The size and shape of the t‐m transformation zones are found to be different for specimens obtained in 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=AδKmI with m values of 15 for the 1.1‐μm 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 ΔKI relation is obtained. Explanations for these different results in the two conditions are discussed in terms of crack tip shielding effects.
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