Adhesive and Nonadhesive, Large Strain AFM Indentation of Rubber-like Materials
نویسندگان
چکیده
Atomic force microscopy is an established technique for probing the local elastic properties of materials at submicron scales. In some cases, linear elastic contact theories based on Hertzian and adhesive contact mechanics suffice to model the indentation process. However, at the large strains that are common in many nanoindentation experiments, the linear models become invalid. A force-indentation relationship based on the Mooney-Rivlin equation and capable of being extended to adhesive behavior that closely follows the Derjaguin-Muller-Toporov (DMT) theory is presented. We use this new relationship to fit data from the AFM indentation of highly swollen, chemically crosslinked poly(vinyl alcohol) gels, which are known to exhibit rubber elastic behavior. The extracted Young’s moduli agree well with values obtained from macroscopic uniaxial compression tests.
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