
Identifying Mechanical Properties of Viscoelastic Materials in Time Domain Using the Fractional Zener Model
2017; Brazilian Society of Mechanical Sciences and Engineering; Volume: 14; Issue: 1 Linguagem: Inglês
10.1590/1679-78252814
ISSN1679-7825
AutoresAna Paula Delowski Ciniello, Carlos Alberto Bavastri, Jucélio Tomás Pereira,
Tópico(s)Probabilistic and Robust Engineering Design
ResumoThe present paper aims at presenting a methodology for characterizing viscoelastic materials in time domain, taking into account the fractional Zener constitutive model and the influence of temperature through Williams, Landel, and Ferry's model. To that effect, a set of points obtained experimentally through uniaxial tensile tests with different constant strain rates is considered. The approach is based on the minimization of the quadratic relative distance between the experimental stress-strain curves and the corresponding ones given by the theoretical model. In order to avoid the local minima in the process of optimization, a hybrid technique based on genetic algorithms and non-linear programming techniques is used. The methodology is applied in the characterization of two different commercial viscoelastic materials. The results indicate that the proposed methodology is effective in identifying thermorheologically simple viscoelastic materials.
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