Estimation of interfacial fracture toughness based on progressive edge delamination of a thin transparent coating on a polymer substrate

Evaluation of interfacial toughness of sub-micron-thickness layers deposited on a ductile substrate is a challenging task which has motivated different experimental approaches Fragmentation testing was used in the present study as a means of interface characterization of a silicon-nitride-coated polyimide substrate. During the test, after an initial rapid segmentation-cracking phase, the coating fragments developed edge delaminations which propagated in a stable manner with further increase in the applied strain The debonding process was modelled by the finite element method Incorporating a cohesive zone at the front of the interfacial crack The edge cracks were found to be dominated by mode II loading. By fitting the predicted delamination evolution to the experimental data for coating fragments of differing geometry, the mode II critical energy release rate was estimated at 30 J m(-2) (C) 2010 Acta Materialia Inc Published by Elsevier Ltd All rights reserved


Published in:
Acta Materialia, 58, 8, 2948–2956
Year:
2010
Publisher:
Elsevier
ISSN:
1359-6454
Keywords:
Note:
[Tarasovs, S. Andersons, J.] Univ Latvia, Inst Polymer Mech, LV-1006 Riga, Latvia. [Leterrier, Y.] Ecole Polytech Fed Lausanne, Lab Technol Composites & Polymeres LTC, CH-1015 Lausanne, Switzerland. Andersons, J, Univ Latvia, Inst Polymer Mech, LV-1006 Riga, Latvia.
ISI Document Delivery No.: 584FK
Times Cited: 0
Cited Reference Count: 32
Tarasovs, S. Andersons, J. Leterrier, Y.
EC [IST-2004-4354]
Part of this work was supported by the EC-funded integrated Project FlexiDis (Contract IST-2004-4354) The authors acknowledge Unaxis France, Display Technology for the supply of film samples
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 Record created 2010-01-21, last modified 2018-11-14

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