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2 article(s) from Aksak, Burak

The effect of flexible joint-like elements on the adhesive performance of nature-inspired bent mushroom-like fibers

Elliot Geikowsky,
Serdar Gorumlu and
Burak Aksak

Beilstein J. Nanotechnol. 2018, 9, 2893–2905, doi:10.3762/bjnano.9.268

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Figure 1: a) Confocal laser scanning microscopy (CLSM) of a lateral view of discoidal (mushroom-shaped) adhes...

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Figure 2: Geometrical characterization of the fibers used in this research detailing the zones where soft (or...

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Figure 3: Shear and normal forces for soft (magenta) and stiff (blue) joint fibers in a load–drag–pull (LDP) ...

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Figure 4: Sequence of images showing the contact of the fibers with the substrate while sliding in the grippi...

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Figure 5: Normal versus shear force for soft (magenta curve) and stiff (blue curve) joint fibers in a LDP tes...

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Figure 6: Shear and normal forces in LDP tests along releasing and gripping directions for stiff, soft, and v...

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Figure 7: a) Shear force and average shear stress during the sliding phase of the dragging stage as a functio...

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Figure 8: a) The ratio of adhesive to shear force during sliding in the gripping direction as a function of p...

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Figure 9: a) The forces at the fiber when dragged along the direction of tilt. b) Fibers start to peel from t...

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Figure 10: Experimental set-up used for the fabrication of bent fibers and LDP tests. a) General lay out of th...

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Figure 11: Fabrication sequence of bent fibers. a) Metal sphere brought in contact with the acrylic peg. b) Th...

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Figure 12: Schematic of the fabrication of soft joint-like elements and mushroom-like tips. a) The bent fiber ...

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Figure 13: The SEM images of the fibers with flexible joints. a,b) after the first dipping step; c,d) after th...

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Full Research Paper

Published 19 Nov 2018

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The optimal shape of elastomer mushroom-like fibers for high and robust adhesion

Burak Aksak,
Korhan Sahin and
Metin Sitti

Beilstein J. Nanotechnol. 2014, 5, 630–638, doi:10.3762/bjnano.5.74

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Figure 1: Scanning electron microscope image of polyurethane mushroom-like fibers with 4 µm stalk radius, 8 µ...

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Figure 2: Two-dimensional axial symmetry model for a mushroom-like fiber. The tip (top surface) is fixed in r...

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Figure 3: Average tensile stress at the tip of the fiber (a) as a function of normalized far field displaceme...

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Figure 4: Normalized pull-off stress Φ contour plots for χ = 5 (top left), χ = 10 (top right), χ = 20 (bottom...

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Figure 5: (a) Normalized pull-off stress as a function of χ for β = 1.1 and θ = {25°, 45°, 60°, 80°}. (b) Nor...

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Figure 6: (a) Simulation results (triangle markers) for β = 1.2, θ = 80° for which a crack initiates at the e...

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Figure 7: (left) Illustration of three different wedge angles for the mushroom-tipped fibers with β = 1.2 and...

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Full Research Paper

Published 14 May 2014

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