Experimental results obtained by Chen and Reyes Morel show that the behavior of Zirconia ceramics is highly pressure-sensitive and, in particular, fits coherently with the Drucker-Prager plasticity model. This is the macroscopic counterpart of shear banding into grains, interaction of shear bands with grain boundaries and subsequent microcracking. These results have strong implications in the design of Zirconia structural elements. In fact, design philosophy based on yield strength is much different from that based on flaw strength. Moreover, the DruckerPrager yield criterion predicts a material behavior substantially different from the von Mises based plasticity. In particular, the Drucker-Prager criterion allows for the introduction of a nonassociated flow rule, so giving the possibility of material instabilities (cavitation, surface exfoliations and macro shear banding) in the hardening range. Moreover, material pressure-sensitivity and nonassociativity have strong effects on crack growth, which may be significant to develop sound design criteria.

Shear banding and crack initiation in Zirconia ceramics / Bigoni, D.; Esposito, L.; Laudiero, F; Radi, E.; Tucci, A.. - (1995), pp. 161-162. ((Intervento presentato al convegno 7th International Conference on Mechanical Behaviour of Materials tenutosi a L'Aia nel 28 Maggio- 2 Giugno 1995.

I documenti presenti in Iris Unimore sono rilasciati con licenza Creative Commons Attribuzione - Non commerciale - Non opere derivate 3.0 Italia, salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Powered by IRIS-about IRIS-Utilizzo dei cookie

 Copyright © 2021