Wrinkling of a charged elastic film on a viscous layer |
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Authors: | Xiang-Fa Wu Yuris A Dzenis Kyle W Strabala |
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Institution: | (1) Department of Engineering Mechanics, Center for Materials Research and Analysis, University of Nebraska-Lincoln, Lincoln, NE 68588-0526, USA;(2) Department of Mechanical Engineering and Department of Mathematics and Statistics, University of Nebraska-Lincoln, Lincoln, NE 68588-0323, USA |
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Abstract: | A thin metallic film deposited on a compliant polymeric substrate begins to wrinkle under compression induced in curing process
and afterwards cooling of the system. The wrinkle mode depends upon the thin film elasticity, thickness, compressive strain,
as well as mechanical properties of the compliant substrate. This paper presents a simple model to study the modulation of
the wrinkle mode of thin metallic films bonded on viscous layers in external electric field. During the procedure, linear
perturbation analysis was performed for determining the characteristic relation that governs the evolution of the plane-strain
wrinkle of the thin films under varying conditions, i.e., the maximally unstable wrinkle mode as a function of the film surface
charge, film elasticity and thickness, misfit strain, as well as thickness and viscosity of the viscous layer. It shows that,
in proper electric field, thin film may wrinkle subjected to either compression or tension. Therefore, external electric field
can be employed to modulate the wrinkle mode of thin films. The present results can be used as the theoretical basis for wrinkling
analysis and mode modulation in surface metallic coatings, drying adhesives and paints, and microelectromechanical systems
(MEMS), etc. |
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Keywords: | Thin films Wrinkling Viscous flow Pattern modulation Applied mechanics |
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