Abstract
A JKR (Johnson-Kendall-Roberts) formalism is used to extract the Young modulus, the contact radius, and the energy release rate simply from the retraction curve of a borosilicate glass colloidal probe from a polydimethylsiloxane (PDMS) surface using an atomic force microscope. PDMS samples ranged from perfectly elastic to those with incipient viscoelasticity. The dependence of the release rate energy with the crack speed is verified using a fracture mechanics-based method. • Simple method for the analysis of AFM force curves to test for PDMS with incipient viscoelasticity. • Dependence of energy release rate from crack speed using a fracture mechanics framework. • Elastic and incipient viscoelastic PDMS behaviour demonstrated through the yield of the crosslinking reaction. • Comparison between microscale and macroscale detachments.
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