Original title: Estimation of the Critical Stress for Failure of a Protective Layer
Authors: Náhlík, Luboš ; Knésl, Zdeněk
Document type: Papers
Conference/Event: International Conference on Materials structure and Micromechanics of Fracture /3./, Brno (CZ), 2001-06-27 / 2001-06-29
Year: 2001
Language: eng
Abstract: This contribution describes a study of the behaviour of a crack growing in a protective layer and penetrating through an interface into a substrate. Special attention is devoted to a crack touching the interface. Conditions for the stability of a crack terminating at the interface between two materials are analyzed. The problem is studied under the assumptions of linear-elastic fracture mechanics. A new tentative criterion of stability based on application of the strain energy density concept is formulated and applied to the problem. The suggested criterion is used to estimate the critical applied stress for the failure of a substrate caused by a crack growing through the protective layer. It is shown that the critical stress may strongly depend on the fracture toughness of the substrate and on the bi-material parameters.
Keywords: crack stability; interface; protective layer
Project no.: CEZ:AV0Z2041904 (CEP), GA101/99/0829 (CEP), KSK2076106 (CEP)
Funding provider: GA ČR, GA AV ČR
Host item entry: International Conference on Materials Structure and Micromechanics of Fracture - MSMF-3, ISBN 80-214-1892-3

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0074507

Permalink: http://www.nusl.cz/ntk/nusl-26433


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Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers