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Communication Dans Un Congrès Année : 2020

Moisture content in PP/OWF composite plates monitored using ultrasound

Résumé

This work explores a wood-polymer composite (WPC) made of a polypropylene (PP) polymer combined with olive wood flour (OWF). The longitudinal wave propagation is proposed as an evaluation mean of the WPC viscoelastic properties. Depending on the OWF ratio content, varied from 0 to 30%, the flour dispersion is evaluated in a scanned zone in view to assess the assumption of homogeneity of such WPC plates. In addition, the moisture content can be indirectly highlighted, due to the immersion of the plate in water during its analysis using ultrasound. This effect was measured and evaluated as a function of the immersion time. For those ultrasound measurements, a transducer having a center frequency of 15 MHz and focusing at 54.7 mm in water was used. Indeed, scans were performed over a zone of 100×100 mm 2 and reflection echoes were recorded for each (x, y) position, with a 0.1 mm step. Then, the measurement of the amplitude of the specular echo, combined with the time of flight gives an estimate of the moisture content in the plate. The resulting evaluation of the moisture content is analyzed using a Fick diffusion law. The resolution of the resulting information is also discussed as a function of the transducer properties versus those of the WPC plate.
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Dates et versions

hal-03097145 , version 1 (05-01-2021)

Identifiants

  • HAL Id : hal-03097145 , version 1

Citer

Pierre Marechal, Nesrine Bouhamed, Olivier Lenoir, Jean Duclos, Slim Souissi, et al.. Moisture content in PP/OWF composite plates monitored using ultrasound. Forum Acusticum, Dec 2020, Lyon (en ligne), France. ⟨hal-03097145⟩
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