VISCOELASTIC RELAXATION MODULUS CHARACTERIZATION USING PRONY SERIES

Authors

  • JUCELIO TOMAS PEREIRA UNIVERSIDADE FEDERAL DO PARANá DEPARTAMENTO DE ENGENHARIA MECâNICA
  • CARLOS ALBERTO BAVASTRI UNIVERSIDADE FEDERAL DO PARANá DEPARTAMENTO DE ENGENHARIA MECâNICA
  • JULIANA ENZWEILER LOPES PACHECO PROGRAMA DE PóS-GRADUAçãO EM ENGENHARIA MECâNICA UNIVERSIDADE FEDERAL DO PARANá

Keywords:

VISCOELASTICITY, MATERIAL CHARACTERIZATION, PRONY SERIES, WIECHERT MODEL, OPTIMIZATION.

Abstract

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.

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Published

2014-10-13

Issue

Vol. 12 No. 2 (2015)

Section

Articles

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