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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© 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
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