Finite elemental analyses revealed the evolution of the interfacial stress distributions as a function of the cap thickness and confirmed the distinct detachment mechanisms. The experimental and numerical results suggest that optimal adhesion was accompanied by the appearance of both edge and interior interfacial cracks during separation. We found that the geometry of the mushroom cap strongly affects the interfacial crack behavior and the pull-off stress. In this work, we combined experiments on single polyurethane mushroom-shaped fibrils (with stalk diameter 80 µm and height 125 µm) against flat glass, with numerical simulations implementing a cohesive zone. Among the design parameters, the cap geometry plays an important role to improve their performance. Enhanced dry adhesion of micropatterned polymeric surfaces has been frequently demonstrated.
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