Hard protective overlayers 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 support loads...

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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
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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 δ1/2 and δ3/2, respectively, where δ is the vertical point displacement. At fixed displacement, 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
2044-5326
DOI:10.1557/JMR.1999.0297