The crack paths, generated by Vickers indentation in Si3N4-SiCW composites, were analyzed from a quantitative point of view, in order to distinguish between the possible toughening mechanisms involved. It was found that the roughness parameter RL and the fractal dimension D describe the geometrical features of the cracks and evidence the anisotropy of the microstructure, due to the whisker and Si3N4B-grain orientation. The relationships found between fracture toughness and these geometrical parameters emphasise the importance of the crack deflection mechanism in improving toughness and provide information on the role played by microstructure in determining the mechanical properties of a composite.
Quantitative evaluation by fractal analysis of indentation crack paths in Si3N4-SiCW composites / Celli A.; Tucci A.; Esposito L.. - In: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. - ISSN 0955-2219. - STAMPA. - 19:4(1999), pp. 441-449. [10.1016/S0955-2219(98)00214-3]
Quantitative evaluation by fractal analysis of indentation crack paths in Si3N4-SiCW composites
Celli A.;Esposito L.
1999
Abstract
The crack paths, generated by Vickers indentation in Si3N4-SiCW composites, were analyzed from a quantitative point of view, in order to distinguish between the possible toughening mechanisms involved. It was found that the roughness parameter RL and the fractal dimension D describe the geometrical features of the cracks and evidence the anisotropy of the microstructure, due to the whisker and Si3N4B-grain orientation. The relationships found between fracture toughness and these geometrical parameters emphasise the importance of the crack deflection mechanism in improving toughness and provide information on the role played by microstructure in determining the mechanical properties of a composite.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
