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An Improved Indentation Method for Estimating Limits of Fracture Toughness in Brittle Films

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Abstract:

We previously presented an energy method for predicting the bounds of fracture toughness of brittle films on a soft substrate from nanoindentation. The method is now further improved by minimizing elastic-plastic work from the measured energy during ring crack formation. Then, we applied this method to determine the limits of fracture toughness of alumina films with a thickness of 100 nm. It was found that fracture toughness of the films is in the range of 1.8-2.2 MPa.m0.5, which is consistent with those measured by the conventional method.

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Periodical:

Advanced Materials Research (Volume 1095)

Pages:

598-602

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1095.598

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Online since:

March 2015

Authors:

Kun Kun Fu*, Yuan Chang, Li Chang, Bai Lin Zheng

Keywords:

Brittle Films, Energy Method, Fracture Toughness, Nanoindentation

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