Nonsingular toughening and R-curve behavior in nominally pure alumina

G. B. May, K. E. Perry, J. L. Shull, J. S. Epstein, H. Okada, C. Scott, S. N. Atluri

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Moire interferometry is employed to study toughening in medium to large grain size nominally pure alumina. The fracture scale length, which is characterized by the grain size of the alumina, is systematically varied from 35 to 102 μm. R curves are derived from bulk mode I compliance calculations for the differing grain sizes and from the near tip moire fringes. The level of material toughening that arises from the nonsingular processes of crack bridging and grain boundary friction are found by comparing the bulk and near tip moire R curves.

Original languageEnglish
Pages (from-to)361-375
Number of pages15
JournalInternational Journal of Fracture
Issue number4
StatePublished - Feb 1993


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