Influences of roll-to-roll process and polymer substrate anisotropies on the tensile failure of thin oxide films

The influence of internal stress anisotropy resulting from anisotropic loading in a roll-to-roll (R2R) process, and polymer substrate anisotropy on the crack onset strain (COS) of thin oxide coatings was analyzed. Experimental data obtained for R2R processed films were compared with data obtained us...

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Bibliographic Details
Published in:Thin solid films 2010-09, Vol.518 (23), p.6984-6992
Main Authors: Leterrier, Yves, Pinyol, Albert, Rougier, Luc, Waller, Judith H., Månson, Jan-Anders, Dumont, Pierre J.J., Andersons, Jānis, Modniks, Jānis, Campo, Manuel, Sauer, Peter, Schwenzel, Julian
Format: Article
Language:English
Subjects:
Anisotropy
Condensed matter: structure, mechanical and thermal properties
Curvature
Deposition
Exact sciences and technology
Failure
Fracture mechanics
Internal stresses
Mathematical analysis
Mechanical and acoustical properties
Orientation
Oxide coatings
Physical properties of thin films, nonelectronic
Physics
Polymer substrates
Residual stress
Roll-to-roll processing
Strain
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:The influence of internal stress anisotropy resulting from anisotropic loading in a roll-to-roll (R2R) process, and polymer substrate anisotropy on the crack onset strain (COS) of thin oxide coatings was analyzed. Experimental data obtained for R2R processed films were compared with data obtained using an isotropic sheet-to-sheet (S2S) process with the same anisotropic substrate. In the R2R case the COS was found to increase by 20% between the transverse direction and the machine direction. In the S2S case the COS was found to be independent of orientation, except at a 45° in-plane orientation with respect to the machine direction, where it was 15% higher. The internal stress in the machine direction could not be determined, presumably due to deposition-induced curvature changes of the polymer substrate, and was therefore fitted to the COS data. Fracture mechanics analysis and finite element modeling of the experimental data showed that the influence of substrate anisotropy was marginal, and that it was the process-induced internal strain in the coating which controlled the COS.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2010.07.033