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Crack growth in transforming ceramics under cyclic tensile loads

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Abstract

The mechanisms of stable growth of short fatigue cracks (crack length up to 1 mm) at room temperature in magnesia-partially stabilized zirconia subjected to cyclic tensile loads were investigated. Single edge-notched specimens were fractured in the four-point bend configuration under cyclic and quasi-static tensile loads. At a load ratio of 0.1, the threshold stress intensity factor range, ΔK, for fracture initiation in cyclic tension is as low as 3.4 M Pam1/2, and catastrophic failure occurs at ΔK=6.6 M Pam1/2. For crack length less than 1 mm and for plane strain conditions, growth rates are highly discontinuous, and periodic crack arrest is observed after growth over distances of the order of tens of micrometres. Crack advance could only be resumed with an increase in the far-field stress intensity range. The mechanisms of short crack advance in cyclic tension are similar to those observed under quasi-static loads, and the tensile fatigue effect appears to be a manifestation of “static failure modes”. A model is presented to provide an overall framework for the tensile fatigue crack growth characteristics of partially stabilized zirconia. Experimental results are also described to demonstrate the possibility of stable room temperature crack growth under cyclic tension in fine-grained tetragonal zirconia polycrystals, partially stabilized with Y2O3. The growth of cracks in transformation-toughened ceramics is found to be strongly influenced by the crack size and shape, stress state and specimen geometry.

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Authors and Affiliations

  1. Division of Engineering, Brown University, 02912, Providence, Rhode Island, USA

    L. A. Sylva & S. Suresh

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  1. L. A. Sylva
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  2. S. Suresh
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Sylva, L.A., Suresh, S. Crack growth in transforming ceramics under cyclic tensile loads. J Mater Sci 24, 1729–1738 (1989). https://doi.org/10.1007/BF01105698

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  • DOI: https://doi.org/10.1007/BF01105698

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