Abstract
Texturing the surface of a PDMS fi lm with microscale pillars has been shown to enhance shear adhesion to a rigid substrate by an order of magnitude when compared to untextured con-trol fi lms. In this study, it is shown that shear load is distrib-uted uniformly among the contacts rather than concentrated on the contacts nearest the edge of the fi lm-substrate interface, which is in contrast to the Kendall peel model for shearing sub-strates. The total shear strength of adhesion is thus estimated as the combined shear strength of each individual micro-contact. Shear-mode contact splitting is confi rmed optically with experiments in which shear failure is observed through a glass coverslip. Recent literature has suggested that texturing the surface of an elastic fi lm may enhance adhesion to a rigid substrate. Theoretical studies have shown that introducing surface micro-structures allows interfacial stress to be distributed to the edge of every feature, rather than concentrated at the blunt edge of the fi lm-substrate interface.
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