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6609644 
Book/Book Chapter 
Determination of Relaxation and Creep Modulus of Polymer Materials Obtained by 3D Printing 
Ibrulj, J; Dzaferovic, E; Obucina, M 
2020 
New Technologies, Development and Application III. Lecture Notes in Networks and Systems 
128 LNNS 
256-266 
INSPEC:19616613 
Typically, Prony series viscoelastic models are used to obtain the so-called. ldquoMasterrdquo curves in analytical form from experimental results. However, the process of approximating experimental results (ldquofittingrdquo) with the Prony model requires prior knowledge of the model's time parameters, in order to fit into the appropriate module. In this paper, parameter optimization was used in such a way that all the parameters in the Prony series for (Ei, taui determined by a simple least squares method. The Prony model was chosen so that the number of members in the Prony series is initially smaller and increases in proportion. An example was chosen for this paper to demonstrate parameter optimization for Prony's relaxation module model and the data was used from an available article, while an experiment using a constant ramp test was performed to determine the creep module. The previous experiment was done for real ABS plastic material (Acrylonitrile butadiene styrene). 
Karabegovic, I.