Abstract
Hemispherical elastomeric shells with a range of thickness, h, press against a planar glass plate in the presence of interfacial adhesion. The applied load, P, is measured as a function of approach distance, δ, while the contact radius, a, is simultaneously monitored. Thick shells with thickness exceeding 3/10 of the hemispherical radius, R, behaves as the classical Hertz-JKR solid sphere, as manifested by the pull-off tensile force and contact radius. As the shell gets thinner, the detachment trajectory deviates and the pull-off force decreases. Very thin shells with h/R falling below 0.05, an uptick in adhesion is observed. Measurements are performed in shells fabricated in two common polymers. Experimental data are fairly consistent with computational results generated by finite element analysis.
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