Creep Effects in Nanometer-scale Contacts to Viscoelastic Materials: A Status Report

Autor:	W. N. Unertl
Rok vydání:	2000
Předmět:	Materials science business.industry Surfaces and Interfaces General Chemistry Adhesion Mechanics Viscoelasticity Surfaces Coatings and Films Optics Contact mechanics Creep Mechanics of Materials Materials Chemistry Dissipation factor Deformation (engineering) business Contact area Nanomechanics
Zdroj:	The Journal of Adhesion. 74:195-226
ISSN:	1545-5823 0021-8464
DOI:	10.1080/00218460008034530
Popis:	Effects of creep on the behavior of nanometer-scale contacts to viscoelastic materials are described from the viewpoint of the contact mechanics theory developed by Ting. The two most important effects are: (1) The time at which maximum contact area and maximum deformation occur can be delayed substantially from the time of maximum applied load. (2) The deformation at separation is related to the loss tangent. These long-range effects due to creep are distinct from the much shorter-range crack tip effects induced by adhesion at the periphery of the contact and associated with the names Barquins and Maugis. Consideration of relevant time scales reveals that creep effects are expected to dominate in SFM-scale contacts for a wide range of compliant viscoelastic materials. Guidelines for selection of optimal experimental parameters for nanometer-scale studies are presented. The need for a comprehensive theory is emphasized.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f58b0fede76ffdaafa6ff15127abc23a https://doi.org/10.1080/00218460008034530 Zobrazit plný text záznamu