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 [1] employed the RIFF technique (from the french "Resolution Inverse Filtrée Fenêtrée") [2]. 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 [3]. By applying this method specifically to the Timoshenko beam problem [4], 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).
Coarse Mesh RIFF Method to Identify the Homogenized Flexural and Shear Complex Moduli of Composite Beams
Sae Int. J. Adv. and Curr. Prac. in Mobility
11th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference ; 2020
Sae International Journal of Advances and Current Practices in Mobility ; 3 , 2 ; 1119-1127
2020-09-30
9 pages
Conference paper
English
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