Experimental identification of homogenized traction and bending complex Young’s modules using a local dynamic inverse method on a sandwich curved beam

Paul Bottois (1) , Frédéric Ablitzer (1) , Pascal Audrain (2) , Nicolas Joly (1) , Charles Pezerat (1)

1 LAUM - Laboratoire d'Acoustique de l'Université du Mans
2 IRT Jules Verne - Institut de Recherche Technologique Jules Verne [Bouguenais]

Identification of elastic and damping properties is a challenge for fabrication of composite materials, which can have complex shapes. A new approach based on the Force Analysis Technique was developed to identify structural parameters from local equation of motion. For structures with known analytical models, this method gave good results. This work presents a similar approach to extend the previous method to structures which cannot be described with known analytical models, where the model is replaced by a Finite Element operator. In order to reduce the amplification of the measurement noise, a procedure based on a probabilistic approach coupled to a minimization of a cost function is proposed. The method is illustrated on a curved beam using simulated displacement. Then, an experimental validation is shown by using measured translations on an aluminum flat beam and on a sandwich curved beam.

Mots clés: Inverse identification; Curved beam; Composite materials; Complex Young’s modules; Force Analysis Technique; FEM

Domaines: Vibrations [physics.class-ph]; Matériaux; Acoustique [physics.class-ph]

Paul Bottois, Frédéric Ablitzer, Pascal Audrain, Nicolas Joly, Charles Pezerat. Experimental identification of homogenized traction and bending complex Young’s modules using a local dynamic inverse method on a sandwich curved beam. Journal of Sound and Vibration, 2021, 490, pp.115686. ⟨10.1016/j.jsv.2020.115686⟩. ⟨hal-02985243⟩