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Eur. Phys. J. AP 22, 15-19 (2003)
DOI: 10.1051/epjap:2003019
Damaging of a soft substrate by cracks propagation through its hard coating: AFM observations and finite element simulation
M. George, J. Colin, C. Coupeau and J. GrilhéLaboratoire de Métallurgie Physique, Université de Poitiers, UMR 6630 CNRS, SP2MI, boulevard Marie et Pierre Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France matthieu.george@etu.univ-poitiers.fr
(Received: 3 June 2002 / Received in final form: 28 November 2002 / Accepted: 20 December 2002 Published online: 3 April 2003 )
Abstract
Atomic force microscopy observations of the fine structure of cracks have been
carried out for nickel thin films on polyimide substrates under tensile test. For strains of the
order of 10%, the cracking of the metallic thin film induces notable damaging of the
polymeric substrate. Post-mortem observations of the substrate and finite element
simulations of the stress field at the cracks head have been performed to characterize this
unexpected damaging: the crack propagation at the film/substrate interface and inside the
substrate.
68.60.Bs - Mechanical and acoustical properties.
68.37.Ps - Atomic force microscopy (AFM).
62.20.Mk - Fatigue, brittleness, fracture, and cracks.
© EDP Sciences 2003
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