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Nanoindentation de couches minces déposées sur substrat de verre de silice

Abstract : This work deals with the improvement of both insight and modelling of the indentation behavior of thin-film coated glass substrates.

We first study the elastic contact to a coated substrate. We present a semi-analytical algorithm allowing efficient calculation of such a contact. The effect of modulus and Poisson ratio mismatch is studied. The Oliver and Pharr method is shown to cause a misevaluation of the contact radius when dealing with coated substrates. We present leads to tackle this problem.

We then study the elastoplastic behavior of silica glass. Using Raman microspectroscopy to measure local density, we map the indentation-induced densification strain in amorphous silica and exhibit a densification-hardening, which we characterize under hydrostatic pressure. Our finite element calculations indicate that this hardening has to be taken into account. We also study the stiffness increase in densified amorphous silica. We finally show how to expand these experimental procedures to more complex silicate glasses using Cr3+ luminescence.
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https://tel.archives-ouvertes.fr/tel-00112005
Contributor : Antoine Perriot <>
Submitted on : Monday, November 6, 2006 - 7:56:10 PM
Last modification on : Wednesday, December 9, 2020 - 3:13:11 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 9:41:42 PM

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  • HAL Id : tel-00112005, version 1

Citation

Antoine Perriot. Nanoindentation de couches minces déposées sur substrat de verre de silice. Mécanique [physics.med-ph]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00112005⟩

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