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Proceedings Paper

Correspondence in damage phenomena and R-curve behavior in ceramics and geomaterials using moire interferometry
Author(s): Kenneth E. Perry; Jonathan Stone Epstein; G. B. May; J. L. Shull
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Paper Abstract

At certain grain sizes, alumina R curves have been shown to increase with crack growth. This phenomenon is in contrast to R curves for metals, which exhibit a steady-state plateau effect with increasing crack growth. Recent results show R curves for calcium silicate geomaterials also increase. The specimen geometry employed for both alumina and geomaterials is a generalized plane stress double cantilever beam (DCB). The specimens are under direct pin loading with fixed displacement. This note will discuss the common mechanisms of increasing R curve behavior of these quasi brittle materials. Finally, a hypothesis on the discrepancy between the fracture toughness of single crack rock samples and in large seismic events is presented.

Paper Details

Date Published: 1 December 1991
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Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.49497
Show Author Affiliations
Kenneth E. Perry, Univ. of Strathclyde (United States)
Jonathan Stone Epstein, Idaho National Engineering Lab. (United States)
G. B. May, Idaho National Engineering Lab. (United States)
J. L. Shull, Univ. of Illinois/Urbana-Champaign (United States)


Published in SPIE Proceedings Vol. 1554:
Second International Conference on Photomechanics and Speckle Metrology
Fu-Pen Chiang; Fu-Pen Chiang, Editor(s)

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