Fracture toughness of nanostructured silicon carbide

Ippolito, M.; Mattoni, A.; Colombo, L.; Cleri, F.
October 2005
Applied Physics Letters;10/3/2005, Vol. 87 Issue 14, p141912
Academic Journal
By using atomistic simulations, we derive a constitutive equation for a microfractured β-SiC matrix containing hard or soft inclusions. The proposed equation is shown to follow the Eshelby theory for elastic inclusions, and appears to hold for any crack tip-inclusion distance and for a wide range of values of matrix-inclusion elastic mismatch. A comparison of the atomistic results with existing continuum elasticity models points out the weaknesses of some commonly adopted simplifying assumptions.


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