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CREEM2025
CREEM 2025 - XXXI Congresso Nacional de Estudantes de Engenharia Mecânica Congresso Nacional de Estudantes de Engenharia Mecânica
Caracterização Viscoelástica de Polímeros com Ajuste Híbrido no Domínio do Tempo via Modelo Wiechert-WLF
Submission Author:
Erick Pedro Krauczuk , Paraná , Brazil
Co-Authors:
Erick Pedro Krauczuk, Jucélio Tomás Pereira
Presenter: Erick Pedro Krauczuk
doi://10.26678/ABCM.CREEM2025.CRE2025-0060
Abstract
Viscoelastic materials (VEMs) play a key role in applications where vibration control, energy dissipation, and time-dependent mechanical response are essential. Accurate characterization of these materials is crucial for predicting their behavior under varying load and temperature conditions. This work proposes a hybrid optimization methodology for identifying constitutive parameters of VEMs in the time domain, considering the Wiechert model and the timetemperature shift factor based on the Williams-Landel-Ferry (WLF) equation. The hybrid optimization approach combines Genetic Algorithms and Nonlinear Programming, enabling robust global search followed by precise local refinement. Experimental data from the polymer EAR® C1002 were used to validate the methodology. The iterative fitting process with up to 33 Prony series terms showed numerical convergence starting from 17 terms, with a reduced error of 3,19×10⁻⁷ and physically consistent parameters. The results demonstrate the efficiency of the proposed methodology in accurately representing the thermorheological behavior of VEMs, contributing to applications in structural, automotive, and aerospace engineering.
Keywords
viscoelastic materials, Hybrid optimization methodology, Prony series, Wiechert model
