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Loading-Unloading Techniques for Determining Fracture Parameters of Brittle Materials Utilizing Four-Point Bend, Chevron-Notched Specimens

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Fracture Mechanics of Ceramics

Abstract

A technique is described for determining the threshold stress intensity factor Kt at which a stationary crack just begins to move. If the crack velocity is described by v ~ KN, Kt can be measured via repeated cyclic loading stable-fracture unloading (UN) experiments. The resistance to fracture calculated for each cycle approaches the threshold (or initiation) value as the full fracture of four-point bend, chevron-notched specimens is approached. The experimentally measured resistance-to-fracture-initiation values for SiC was ~ 6J/m2, 30J/m2 for yttria partially stabilised zirconia, ~ 10 J/m2 for yttria fully stabilised zirconia, and ~ 80J/m2 for graphite. The R-curve behaviour of a PSZ- ß Al2O3 composite was analysed by the UN technique. The nonelastic energy dissipation rate for this composite approached 600J/m2.

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Authors and Affiliations

  1. Ceramic Engineering Research Group, Department of Metallurgy and Materials Science, McMaster University, Hamilton, Ontario, Canada

    Thomas B. Troczynski & Patrick S. Nicholson

Authors
  1. Thomas B. Troczynski
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  2. Patrick S. Nicholson
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Editor information

Editors and Affiliations

  1. College of Engineering, University of Washington, Seattle, Washington, USA

    R. C. Bradt

  2. Department of Materials and Mineral Engineering, University of California, Berkeley, California, USA

    A. G. Evans

  3. Department of Materials Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA

    D. P. H. Hasselman

  4. Rockwell International, Science Center, Thousand Oaks, California, USA

    F. F. Lange

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© 1986 Plenum Press, New York

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Troczynski, T.B., Nicholson, P.S. (1986). Loading-Unloading Techniques for Determining Fracture Parameters of Brittle Materials Utilizing Four-Point Bend, Chevron-Notched Specimens. In: Bradt, R.C., Evans, A.G., Hasselman, D.P.H., Lange, F.F. (eds) Fracture Mechanics of Ceramics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7026-4_15

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  • DOI: https://doi.org/10.1007/978-1-4615-7026-4_15

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4615-7028-8

  • Online ISBN: 978-1-4615-7026-4

  • eBook Packages: Springer Book Archive

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