Please use this identifier to cite or link to this item: doi:10.22028/D291-29459
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Title: Cohesive detachment of an elastic pillar from a dissimilar substrate
Author(s): Fleck, Norman A.
Khaderi, Syed N.
McMeeking, Robert M.
Arzt, Eduard
Language: English
Title: Journal of the Mechanics and Physics of Solids
Volume: 101
Startpage: 30
Endpage: 43
Publisher/Platform: Elsevier
Year of Publication: 2017
Publikation type: Journal Article
Abstract: The adhesion of micron-scale surfaces due to intermolecular interactions is a subject of intense interest spanning electronics, biomechanics and the application of soft materials to engineering devices. The degree of adhesion is sensitive to the diameter of micro-pillars in addition to the degree of elastic mismatch between pillar and substrate. Adhesion-strength-controlled detachment of an elastic circular cylinder from a dissimilar substrate is predicted using a Dugdale-type of analysis, with a cohesive zone of uniform tensile strength emanating from the interface corner. Detachment initiates when the opening of the cohesive zone attains a critical value, giving way to crack formation. When the cohesive zone size at crack initiation is small compared to the pillar diameter, the initiation of detachment can be expressed in terms of a critical value Hc of the corner stress intensity. The estimated pull-off force is somewhat sensitive to the choice of stick/slip boundary condition used on the cohesive zone, especially when the substrate material is much stiffer than the pillar material. The analysis can be used to predict the sensitivity of detachment force to the size of pillar and to the degree of elastic mismatch between pillar and substrate.
DOI of the first publication: 10.1016/j.jmps.2017.01.001
Link to this record: hdl:20.500.11880/28150
ISSN: 0022-5096
Date of registration: 21-Oct-2019
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Eduard Arzt
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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