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

THIN SOLID FILMS

卷:518

Article

Leterrier, Yves¹  Pinyol, Albert¹  Rougier, Luc¹  Waller, Judith H.¹  Manson, Jan-Anders¹  Dumont, Pierre J. J.²  Andersons, Janis³  Modniks, Janis³  Campo, Manuel⁴  Sauer, Peter⁴  Schwenzel, Julian⁴ 

[1] Ecole Polytech Fed Lausanne, Lab Technol Composites & Polymeres LTC, Stn 12, CH-1015 Lausanne, Switzerland

[2] Inst Polytech Grenoble, CNRS, LGP2, F-38402 St Martin Dheres, France

[3] Inst Polymer Mech, LV-1006 Riga, Latvia

[4] Appl Mat GmbH & Co KG, D-63755 Alzenau, Germany

关键词: Anisotropy;    Roll-to-roll processing;    Failure;    Internal stresses;    Polymer substrates;   

DOI  :  10.1016/j.tsf.2010.07.033

来源: Elsevier

【 摘 要 】

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 isotrophic 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 450 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. (C) 2010 Elsevier B.V. All rights reserved.

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