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Identification of dynamic properties via a method based on Force Analysis Technique : application to flax fibre reinforced PA11

Abstract : The aim of this work is to characterize the dynamic behaviour of a biocomposite material using a vibratory method. In order to extend the application field of these materials to the vibration domain, the knowledge of the dynamic properties as a function of the frequency is necessary. For this purpose, a method is applied to identify the storage modulus and the loss factor over a large range of frequencies. This method, which is based on the Force Analysis Technique, uses the measurement of a vibrating plate displacement field. Firstly, the material, composed of a thermoplastic natural matrix PA11 reinforced by unidirectional flax fibres, is elaborated by thermocompression. The microstructure is analysed by scanning electron microscopy and tomography and the mechanical behavior is investigated under quasi-static conditions. In a second step, a sensitivity analysis of the dynamic method is carried out to highlight the parameters that should be taken into consideration during the displacement field measurement and the data post-treatment. Two measurement techniques are compared: the digital image correlation and the laser Doppler vibrometer. Afterwards, the identification of the storage modulus and the loss factor of the biocomposite flax/PA11 is obtained over a range of frequencies up to 10000 Hz, by using the displacement field of suspended plates measured with a laser vibrometer. In support of these results, a comparison is carried out with values obtained by a dynamic mechanical analysis (DMA) using the temperature-frequency superposition principle. In conclusion, the method gives a correct identification of the flax/PA11 storage modulus over the entire range of frequencies.
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Federico Amenini. Identification of dynamic properties via a method based on Force Analysis Technique : application to flax fibre reinforced PA11. Materials. Université de Bretagne Sud, 2019. English. ⟨NNT : 2019LORIS532⟩. ⟨tel-02878900⟩

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