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Validating the modeling of sandwich structures with constrained layer damping using fractional derivative models

  • R. Pirk
  • L. Rouleau
  • W. Desmet
  • B. Pluymers
Technical Paper

Abstract

The effect of the damping insertion due to viscoelastic material (VEM) on the dynamic behavior of aluminum panels is assessed in this work. Dynamic mechanical analysis tests are carried out, aiming at characterizing the rheological behavior of a VEM compound. The time–temperature superposition principle is applied and the VEM compound master curve is built over a large frequency range. The parameters of the fractional derivative model are identified from the obtained master curve, and then input in the model. A distributed coating of constrained VEM applied to a homogeneous aluminum plate is considered in this study. In a first step, the responses of this sandwich structure are calculated by using finite element method (FEM). Free and clamped boundary conditions configurations are modeled. In a second step, tests are performed using the KULeuven test facilities by reproducing the same modeled configurations and the experimental frequency response functions (FRF) are measured. To validate the built FEM models, numerical vs. experimental FRF comparisons are done. Despite a slight underestimation of the damping, good agreements were observed in the whole frequency range.

Keywords

Viscoelastic material Sandwich panel Constrained layer damping Fractional derivative model 

Notes

Acknowledgments

The Brazilian Science without Borders Program is acknowledged by the first author. The KU Leuven Research Fund, the European Marie Curie IAPP Project INTERACTIVE and the Strategic Initiative Materials in Flanders (SIM) through the “MacroModelMat,M3NVH” Program are also gratefully acknowledged for their support.

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2016

Authors and Affiliations

  1. 1.KU Leuven, Department of Mechanical EngineeringHeverleeBelgium
  2. 2.Institute of Aeronautics and Space (IAE)/Technological Institute of Aeronautics (ITA)São José dos CamposBrazil
  3. 3.LMSSC, Conservatoire national des arts et métiersParisFrance

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