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Buckling of an Adhesive Polymeric Micropillar.
- Source :
-
Journal of Adhesion . Feb2013, Vol. 89 Issue 2, p140-158. 19p. - Publication Year :
- 2013
-
Abstract
- Adhesion and buckling of single PDMS micropillars were investigated as a function of compressive preload. The micropillars had diameters of 10, 12, 14, and 20 μm and aspect ratios of 1 to 3.3. Adhesion generally increased with a decrease in the aspect ratio. A dependence of pull-off strength on the compressive preload stress was found for micropillars that underwent buckling. When buckling was reversible, tip contact recovered upon unbuckling, which resulted in only a slight reduction of adhesion. In situ observation studies identified irreversible buckling, i.e., lack of tip-contact re-formation, resulting in adhesion loss. It is concluded that the edge radius of the tip, which acts as a circumferential crack, controls adhesion. Fibril buckling is found to be broadly consistent with the predictions of Euler buckling theory. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 00218464
- Volume :
- 89
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Adhesion
- Publication Type :
- Academic Journal
- Accession number :
- 83590250
- Full Text :
- https://doi.org/10.1080/00218464.2013.731941