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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)

Abstract

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.

Keywords

Fracture Toughness Acoustic Emission Crack Interface Acoustic Emission Signal Stable Crack Growth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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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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