THESIS
2020
x, 50 pages : illustrations (some color) ; 30 cm
Abstract
Gecko-inspired synthetic adhesions based on van der Waals forces possess reversible and
directional properties whereas the interlocking adhesives enhance forces especially in shear
and peeling directions. By combining two working principles, a novel interlocking adhesive
using two gecko-inspired micro-wedged adhesives is reported aiming the reversible force-enhanced
adhesives. In order to investigate the mechanical interlocking behaviour of the micro-wedge
adhesives, geometries of adhesive were altered with selected tilt angles (0°, 15°, and
30°) and constant parameters of triangle of line patterns having a height of 100 μm and the
angle of tip in 25.5°. The load-pull (LP), load-drag-pull (LDP) and pure shear tests were
conducted for gecko-inspired adhesives to understanding the...[
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Gecko-inspired synthetic adhesions based on van der Waals forces possess reversible and
directional properties whereas the interlocking adhesives enhance forces especially in shear
and peeling directions. By combining two working principles, a novel interlocking adhesive
using two gecko-inspired micro-wedged adhesives is reported aiming the reversible force-enhanced
adhesives. In order to investigate the mechanical interlocking behaviour of the micro-wedge
adhesives, geometries of adhesive were altered with selected tilt angles (0°, 15°, and
30°) and constant parameters of triangle of line patterns having a height of 100 μm and the
angle of tip in 25.5°. The load-pull (LP), load-drag-pull (LDP) and pure shear tests were
conducted for gecko-inspired adhesives to understanding the dynamic adhesion with the
normal-shear relationship. For interlocking adhesives, the LP, LDP and lap shear tests were
conducted to investigate the mechanical behaviours and performances of normal and shear
forces. The lap shear test was conducted to further analysed the interlocking adhesive in peeling
failure mode. The interlocking adhesives without a tilt angle improved shear strength to 55.6
kPa (area = 0.9 cm²) in LDP test which is 1.4 times of those for single adhesive. Moreover, the
maximum shear strength of interlocking adhesive is 26.7 kPa (area = 8.7 cm²) in lap shear test.
Although the angled design encountered problem of difficult to engage and leaded to reduced
adhesion, the improvements found in design without a tilt angle showed that a potential
enhancement may also be suggested in angled designs if the engagement problem resolved.
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