Hard protective overlays on viscoelastic-plastic substrates

A simple superposition solution for a point-loaded elastic plate on a soft substrate is proposed. The solution considers a "drumhead" being elastically bent into a compliant substrate that is viscoelastic-plastic. With simplifying assumptions it is found that the drumhead and substrate sup...

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Bibliographic Details
Published in:Journal of materials research 1999-06, Vol.14 (6), p.2210-2218
Main Authors: Gerberich, W W, Strojny, A, Yoder, K, Cheng, L S
Format: Article
Language:English
Online Access:Get full text
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Summary:A simple superposition solution for a point-loaded elastic plate on a soft substrate is proposed. The solution considers a "drumhead" being elastically bent into a compliant substrate that is viscoelastic-plastic. With simplifying assumptions it is found that the drumhead and substrate support loads proportional to delta exp 1/2 and delta exp 3/2 , respectively, where delta is the vertical point displacement. At fixed displacment, relaxation proceeds at high loads, but if sufficiently unloaded, recovery or increased load results with time. Qualitative verification of the time-dependent drumhead solution is shown by relaxation and recovery data on polycarbonate covered by polysiloxane, composite or diamondlike carbon (DLC) coatings, and films.
ISSN:0884-2914