Nondestructive Estimation of Fracture Toughness Using Instrumented Indentation Technique

Abstract:

This study focused on the determination of fracture toughness by instrumented indentation technique. A theoretical model to estimate the fracture toughness of ductile materials is proposed and used to verify those results. Modeling of IIT to evaluate fracture toughness is based on two main ideas; the energy input up to characteristic fracture initiation point during indentation was correlated with material’s resistance to crack initiation and growth, and this characteristic fracture initiation point was determined by concepts of continuum damage mechanics. The estimated fracture toughness values obtained from the indentation technique showed good agreement with those from conventional fracture toughness tests based on CTOD. In addition, we confirmed that the proposed model can be also applied in the brittle material through modification of void volume fraction.

• Periodical: Key Engineering Materials (Volumes 385-387)
• Pages: 893-896
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.385-387.893
• Online since: July 2008
• Authors: Kyung Woo Lee, Hyun Uk Kim, Sang Wook Park, Jung Suk Lee, Kwang Ho Kim, Dong Il Kwon
• Keywords: Fracture Toughness, Instrumented Indentation, Mechanical Property, Non-Destructive

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