Please use this identifier to cite or link to this item: doi:10.22028/D291-33176
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Title: A Design Strategy for Mushroom-Shaped Microfibrils With Optimized Dry Adhesion: Experiments and Finite Element Analyses
Author(s): Zhang, Xuan
Wang, Yue
Hensel, René
Arzt, Eduard
Language: English
Title: Journal of applied mechanics
Volume: 88
Issue: 3
Publisher/Platform: ASME
Year of Publication: 2020
Publikation type: Journal Article
Abstract: Enhanced dry adhesion of micropatterned polymeric surfaces has been frequently demonstrated. Among the design parameters, the cap geometry plays an important role to improve their performance. In this study, we combined experiments on single polyurethane mushroom-shaped fibrils (with a stalk diameter of 80 µm and height of 125 µm) against flat glass, with numerical simulations implementing a cohesive zone. We found that the geometry of the mushroom cap strongly affects the interfacial crack behavior and the pull-off stress. The experimental and numerical results suggest that optimal adhesion was accompanied by the appearance of both edge and interior interfacial cracks during separation. Finite elemental analyses revealed the evolution of the interfacial stress distributions as a function of the cap thickness and confirmed the distinct detachment mechanisms. Furthermore, the effect of the stalk diameter and the Young's modulus on the adhesive force was established, resulting in an optimal design for mushroom-shaped fibrils.
DOI of the first publication: 10.1115/1.4049183
URL of the first publication:
Link to this record: hdl:20.500.11880/30509
ISSN: 0021-8936
Date of registration: 1-Feb-2021
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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