Modified flat-punch model for hyperelastic polymeric and biological materials in nanoindentation
Abstract(#br)Nanoindentation can characterize in-situ elastic modulus E of an object by pressing an indenter into the sample surface and fitting the detected data to a contact equation. In this work, we found the conventional contact-mechanism theory resulted in a high uncertainty of E for the hyperelastic materials, including some polymers and biological cells. The evaluated E displayed an exponential decrease with increasing indent distance when fitting to Hertz model and caused high E variance as a function of indent depth.