Nonlinear Viscoelastic Nanoindentation of PVAc

A nonlinear viscoelastic nanoindentation analysis was conducted for polyvinyl acetate (PVAc) with a glass transition temperature of 29 °C. Nanoindentation using an MTS Berkovich nanoindenter was made on PVAc at different depths. The load-displacement curves were determined using nanoindentation. A nonlinear viscoelastic model was implemented in ABAQUS/Standard Code to analyze the nonlinear visceoasltic behavior of PVAc under nanoindentation. The effects of nonlinearity on the load-displacement curves, as well as on the indent impression were investigated.