Abstract
The validity of several known failure initiation criteria at reentrant corners in brittle elastic materials is examined and a simple one is proposed. Their predictions, under mode I stress field, are compared to experimental observations carried out on PMMA (polymer) and Alumina-7%Zirconia (ceramic) V-notched specimens. Because all realistic V-notched reentrant corners are blunt, a detailed experimental procedure has been followed, focusing on specimens with different notch tip radii. It is demonstrated that by assuming a sharp V-notch, some failure criteria predict reasonably well the experimental findings, and that corrections are needed in order for these to take into consideration the realistic radius at the notch tip.
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Yosibash, Z., Bussiba, A. & Gilad, I. Failure criteria for brittle elastic materials. International Journal of Fracture 125, 307–333 (2004). https://doi.org/10.1023/B:FRAC.0000022244.31825.3b
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DOI: https://doi.org/10.1023/B:FRAC.0000022244.31825.3b