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Crack Evolution and Estimation of Fracture Toughness of HfO 2 /SiCN(O) Polymer Derived Ceramic Nanocomposites
Author(s) -
Sujith Ravindran,
Zimmermann Andre,
Kumar Ravi
Publication year - 2015
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400525
Subject(s) - materials science , fracture toughness , composite material , ceramic , indentation , nanocomposite , elastic modulus , poisson's ratio , crack growth resistance curve , fracture mechanics , toughness , modulus , crack closure , poisson distribution , statistics , mathematics
In this study the crack evolution and fracture toughness of HfO 2 /SiCN(O) ceramic nanocomposites were studied. These ceramics crack radially under indentation in contrast to Hertzian crack in SiOC ceramics. This difference was attributed to the variance in Poisson's ratio and elastic modulus to hardness ratio. Fracture toughness by crack opening displacement and radial crack length measurement was 0.8–1.2 MPa.m 1/2 and 2.5–3 MPa.m 1/2 , respectively. The open network forming structure resulted in the over estimation of fracture toughness value by RCL.