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Maréchal, Pierre
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Publications (7/7 displayed)
- 2024Integrated analysis of materials for offshore wind turbine blades: mechanical and acoustical coupling
- 2022Characterization of thin biological layer by scanning acoustic microscope (SAM)
- 2020Acoustical Surface Characterization of PP/OWF Composite Plates
- 2018Effect of Injection Direction in Elaboration of Polypropylene Reinforced with Olive Wood Flour on Ultrasonic and Morphological Properties ; Effet de la direction d'injection lors de l'élaboration de polypropylène renforcé avec de la farine de bois d'olivier: propriétés ultrasonores et morphologiquescitations
- 2018High temperature polymerization monitoring of an epoxy resin using ultrasoundcitations
- 2016Ultrasound monitoring of the cure kinetics of an epoxy resin: Identification, frequency and temperature dependencecitations
- 2011Ultrasound monitoring of bubble size and velocity in a fluid model using phased array transducercitations
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document
Acoustical Surface Characterization of PP/OWF Composite Plates
Abstract
Polypropylene polymer (PP) combined with olive wood flour (OWF) reinforcement is studied in view to find an optimum of viscoelastic properties. The flour ratio content is varied from 0 to 30% and its influence is characterized in terms of surface homogeneity and in terms of acoustic impedance. This acoustical surface property is closely related to the wavelength and active area of the used transducer if it is a plane one. In case of a focused transducer, the wavelength is also a key parameter as well as the so-called f-number which is the ratio between focal distance and active diameter. The focal spot size is thus the surface from which the average acoustical impedance property can be evaluated. The effective wave velocity is deduced from time-of-flight measurements and combined with the average acoustical impedance in order to deduce the effective surface averaged density. As a result, some C-scans of specular echoes obtained for a given PP/OWF composition are compared as a function of the center frequency. The distribution of these acoustical surface properties is compared and discussed for various compositions, depending on the chosen transducer. The influence of the surface roughness is also discussed as an influencing parameter. The analysis of those experimental results constitutes a tool for the improvement of the fabrication process.