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Determination of da/dN-ΔK 1 curves for small cracks in alumina in alternating bending tests

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Abstract

Crack-growth relations under cyclic fatigue conditions are mostly determined for long cracks. In order to determine da/dN-ΔK curves for small cracks from lifetimes under cyclic load a procedure has been derived which is based on a method usually applied to subcritical crack growth. To prove the cyclic effect and to demonstrate the procedure in detail, measurements were carried out on an Al2O3-ceramic in bending with anR-ratio ofR=−1 and two types of relatively small cracks, namely natural cracks and Knoop-cracks. It was found that both crack types exhibit the same da/dN-ΔK relation. The exponent of the Paris law for fatigue crack growth is significantly different from the exponent of the power law for subcritical crack growth.

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Authors and Affiliations

  1. Kernforschungszentrum Karlsruhe, Institut für Material- und Festkörperforschung IV, Universität Karlsruhe, Institut für Zuverlässigkeit und Schadenskunde im Maschinenbau, FRG

    T. Fett, G. Martin, D. Munz & G. Thun

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  1. T. Fett
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  2. G. Martin
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  3. D. Munz
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  4. G. Thun
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Fett, T., Martin, G., Munz, D. et al. Determination of da/dN-ΔK 1 curves for small cracks in alumina in alternating bending tests. J Mater Sci 26, 3320–3328 (1991). https://doi.org/10.1007/BF01124680

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  • DOI: https://doi.org/10.1007/BF01124680

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