Transient response of a sandwich structure damped with a fibrous core material

E. Piollet (1) , Guilhem Michon (2) , A. Ross (2, 1)

1 LAVA - Laboratoire d'Analyse Vibratoire et Acoustique
2 ICA - Institut Clément Ader

This paper investigates the effect of a fibrous core material on the transient response of a sandwich structure. The core material studied is made of entangled carbon fibers cross-linked with epoxy resin. In order to understand its complex behavior, the material is characterized in shear oscillation, and the obtained shear-stress loops are described using Dahl’s dynamic hysteresis model. Then, the transient response of a single-degree-of-freedom system including this material is simulated and the amplitude dependency of the response is analyzed. Sandwich beams with the fibrous core material are tested experimentally with a impact hammer and compared with classical honeycomb and foam cored sandwich beams. The entangled cross-linked fibers are shown to provide high damping resulting in a fast return to the equilibrium position. Both theoretical and experimental studies showed nonlinear damping. In the amplitude range studied, the material is more interesting at high impact amplitude.

Mots clés: vibration damping; sandwich structures; nonlinear behavior; transient response

Domaines: Mécanique des matériaux [physics.class-ph]

E. Piollet, Guilhem Michon, A. Ross. Transient response of a sandwich structure damped with a fibrous core material. CANCAM, London, ON, Canada, May 2015, London, ON, Canada. ⟨hal-02052199⟩