Prediction of Dissipative Properties of Flax Fibers Reinforced Laminates by Vibration Analysis

Abstract

This study proposes an experimental-numeric method to identify the viscoelastic properties of flax fibres reinforced composite laminate (flax/epoxide). The used method consists in identifying the evolutions of both loss factor and stiffness when vibrational frequency changes. In this way, several free-free symmetrically guided beams are excited on a dynamic range of 10 to 4000 Hz with sweep sine excitation focused around the 4-first’s modes. Fractional derivative Zener model is used to identify the on-axis ply complex moduli and describe the laminate dissipative linear behavior with the classical laminate theory. Results obtained on a quasi-isotropic laminate show that this model adequately predicts the vibrational behavior of the tested laminates.

Mechanical Response of Epoxy Resin—Flax Fiber Composites Subjected to Repeated Loading and Creep Recovery Tests

“…From the studied plant reinforcements, flax fiber has been shown to be the most prominent. It possesses the highest mechanical properties [ 9 , 11 , 12 , 13 , 14 ], competitive vibration damping [ 15 , 16 ], and energy absorption capabilities [ 14 , 17 ] when compared to glass or carbon fiber composites, as well as a low density, which leads to high specific strength and stiffness [ 18 ].…”