Correspondence in damage phenomena and R-curve behavior in ceramics and geomaterials using moire interferometry

Kenneth E. Perry Jr.; Jonathan Stone Epstein; G. B. May; J. L. Shull

doi:10.1117/12.49497

1 December 1991 Correspondence in damage phenomena and R-curve behavior in ceramics and geomaterials using moiré interferometry

Kenneth E. Perry Jr., Jonathan Stone Epstein, G. B. May, J. L. Shull

Author Affiliations +

Proceedings Volume 1554, Second International Conference on Photomechanics and Speckle Metrology; (1991) https://doi.org/10.1117/12.49497
Event: San Diego, '91, 1991, San Diego, CA, United States

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.

Citation Download Citation

Kenneth E. Perry Jr., Jonathan Stone Epstein, G. B. May, and J. L. Shull "Correspondence in damage phenomena and R-curve behavior in ceramics and geomaterials using moiré interferometry", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); https://doi.org/10.1117/12.49497

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