Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 16, Pages 3055-3057Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1711164
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Indentation tests with loads between 0.5 and 10 mN were performed on fused quartz, (0001) oriented sapphire and (001) oriented barium titanate. The resulting submicron cracks were used to determine the fracture toughness K-IC of the tested samples. The indentation crack length method was applicable, but a c/a dependency of the constant of proportionality was found. In addition, a very effective and simple approach-using the extra penetration of the indenter, due to the formation of cracks, so called pop-in-was used to determine K-IC. (C) 2004 American Institute of Physics.
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