Effects of stretching and cycling on the fatigue behavior of polymer-supported Ag thin films

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The fatigue behavior of silver films on polyethylene-terephthalate substrates is studied for various levels of film thickness, pre-stretch, sample width, and applied strain range. Films with large pre-stretch have a shorter fatigue life, with failure caused by strain localization (films thicker than 100 nm) or intergranular crack formation (100 nm film). There is a significant effect of film thickness on how the strain range affects the fatigue life - we observe 'smaller is better' behavior for films subjected to a total strain range of Delta epsilon(t)= 1.0%, while the opposite is true when the total strain range increases to 2.0%. We attribute this difference to a shift in failure mechanism with strain amplitude from typical fatigue failure to a more ductile-type failure. Our experimental results are well described by the Coffin-Manson relationship and a failure mechanism map is drawn based on the experimental results. Considering stretchability and long-term reliability, design suggestions are made to optimize the fatigue life of coatings subjected to uniaxial stretch and fatigue. (C) 2013 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2013-07
Language
English
Article Type
Article
Keywords

MECHANICAL-PROPERTIES; COPPER-FILMS; METAL-FILMS; DAMAGE FORMATION; LENGTH-SCALE; GRAIN-SIZE; CU FILMS; SUBSTRATE; DEFORMATION; BAUSCHINGER

Citation

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.575, pp.86 - 93

ISSN
0921-5093
DOI
10.1016/j.msea.2013.03.043
URI
http://hdl.handle.net/10203/174097
Appears in Collection
ME-Journal Papers(저널논문)
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