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Viscoelastic Relaxation Modulus Characterization Using Prony Series

2015; Brazilian Society of Mechanical Sciences and Engineering; Volume: 12; Issue: 2 Linguagem: Inglês

10.1590/1679-78251412

1679-7825

Juliana E. Lopes Pacheco, Carlos Alberto Bavastri, Jucélio Tomás Pereira,

Asphalt Pavement Performance Evaluation

The mechanical behavior of viscoelastic materials is influenced, among other factors, by parameters like time and temperature. The present paper proposes a methodology for a thermorheologically and piezorheologically simple characterization of viscoelastic materials in the time domain based on experimental data using Prony Series and a mixed optimization technique based on Genetic Algorithms and Nonlinear Programming. The text discusses the influence of pressure and temperature on the mechanical behavior of those materials. The results are compared to experimental data in order to validate the methodology. The final results are very promising and the methodology proves to be effective in the identification of viscoelastic materials.