Observation of Stable Crack Growth in AL2O3-Ceramics by Acoustic Microscopy and Acoustic Emission

  • A. Quinten
  • C. Sklarczyk
  • W. Arnold
Part of the Acoustical Imaging book series (ACIM, volume 18)


When cracks propagate upon loading in certain ceramics, one observes an increase in crack-resistance with increasing crack length (R-curve behavior). This phenomenon is controversially discussed presently [1,2]. The dissipation of energy, in one class of models, is explained by the assumption that microcracks are present at the crack tip having certain extension (process-zone) [1]. In the other models, the increase in crack-resistance is explained by the interaction of the crack interfaces due to friction between serrated crack walls [3]. From practical point of view, it is necessary to understand these phenomena because they may possibly enable one to improve the fracture toughness of high-strength ceramics. In this paper we report on measurements of the elastic properties at the crack-tip of a stably extended crack using Scanning Acoustic Microscopy (SAM). Acoustic Emission (AE) was also monitored during crack-growth. We also discuss phenomena observed at the crack-walls.


Nickel Attenuation Acoustics 


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  1. [1]
    Buresch, F. E., Materialprüfung 29, 261 (1987)Google Scholar
  2. [2]
    Knehans R. and Steinbrech, R., Fortschritts. Ber. Deutsch. Keram. Gesellsch. 1, 59 (1985)Google Scholar
  3. [3]
    Knehans R. and Steinbrech R., J. Mat. Sci. Lett., 1, 327 (1982)CrossRefGoogle Scholar
  4. [4]
    Quinten, A., and Arnold, W., Mat. Sci. Eng., to be published (1989)Google Scholar
  5. [5]
    Briggs, G. A. D., “An Introduction to Scanning Acoustic Microscopy”, Oxford University Press (1985)Google Scholar
  6. [6]
    Babilon, E., Buresch, F. E., Kleist, G., and Nickel, H., Proc. Europ. Conf., Fract. Mech. (Budapest 1988), to be publishedGoogle Scholar
  7. [7]
    Swanson, P. L., Fairbanks, C. J., Lawn, B. R., Mai, Yiu-Wing, and B. J. Hockey, J. Am. Ceram. Soc. 70, 279 (1987)CrossRefGoogle Scholar
  8. [8]
    Buck, O., Morris, W. L., and Richardson J. M., Appl. Phys. Lett. 33, 371 (1978)ADSCrossRefGoogle Scholar
  9. [9]
    Babilon, E., private communicationGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • A. Quinten
    • 1
  • C. Sklarczyk
    • 1
  • W. Arnold
    • 1
  1. 1.Fraunhofer-Institute for Non-Destructive TestingSaarbrücken 11Germany

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