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Nonlinear visco-plastic material characterization utilizing a nonlinear least squares identification algorithm

This work utilizes a previously developed phenomenological model of an electrorheological fluid to predict the response of the material in the presence of an electric field. The model consists of discrete elements, namely, enhanced non- linear Bingham type damping. Newtonian damping and an inertial term, to account for momentum effects. The model is incorporated into a non-linear least squares algorithm to assess the parametric coefficients required to successfully simulate response. For the evaluation of the algorithm experimental data from rheometer tests is utilized.