Significance of low energy impact damage on modal parameters of composite beams by design of experiments

Amir Shahdin (1) , Joseph Morlier (1) , Yves Gourinat (1)

1 ICA - Institut Clément Ader

This paper presents an experimental study on the effects of multi-site damage on the vibration response of composite beams damaged by low energy impacts around the barely visible impact damage limit (BVID). The variation of the modal parameters with different levels of impact energy and density of damage is studied. Vibration tests have been carried out with both burst random and classical sine dwell excitations in order to compare that which of the methods among Polymax and Half Bandwidth Method is more suitable for damping estimation in the presence of damage. Results show that damping ratio is a more sensitive parameter for damage detection than the natural frequency. Design of experiments also highlighted energy of impact as the factor having a more significant effect on the modal parameters. Half Bandwidth Method is found to be unsuitable for damping estimation in the presence of damage.

Mots clés: Damage detection; Vibration measurement; Design of experiments; Composites

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

Amir Shahdin, Joseph Morlier, Yves Gourinat. Significance of low energy impact damage on modal parameters of composite beams by design of experiments. 7th International Conference on Modern Practice in Stress and Vibration Analysis, Sep 2009, Cambridge, United Kingdom. pp.1-8. ⟨hal-01851875⟩