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Coarse Mesh RIFF Method to Identify the Homogenized Flexural and Shear Complex Moduli of Composite Beams
ISSN: 2641-9637, e-ISSN: 2641-9645
Published September 30, 2020 by SAE International in United States
Event: 11th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
Citation: Wassereau, T., Guyader, J., Ablitzer, F., and Pezerat, C., "Coarse Mesh RIFF Method to Identify the Homogenized Flexural and Shear Complex Moduli of Composite Beams," SAE Int. J. Adv. & Curr. Prac. in Mobility 3(2):1119-1127, 2021, https://doi.org/10.4271/2020-01-1579.
This paper aims at identifying the flexural and shear complex moduli of a sandwich beam by simply measuring the displacement field and applying an inverse resolution of the Timoshenko beam problem. A first development  employed the RIFF technique (from the french "Resolution Inverse Filtrée Fenêtrée") . This article presents an improvement, using the RIC method ("Résolution Inverse Corrigée" in french) that involves a correction of the finite difference scheme as originally suggested in . By applying this method specifically to the Timoshenko beam problem , one can asses the viscoelastic parameters of composite beams, based on a coarse mesh measurement of the displacement field using a simple accelerometer and an instrumented hammer. An experimental validation conducted on a sandwich honeycomb beam with fibreglass faces allows satisfactory identifications despite a low spatial resolution (down to 2.1 samples per wavelength).