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Ironless transducer for measuring the mechanical properties of porous materials
Review of Scientific Instruments (2010)
  • Olivier Doutres
  • Nicolas Dauchez
  • Jean-Michel Génevaux
  • Guy Lemarquand
  • Sylvain Mezil
This paper presents a measurement setup for determining the mechanical properties of porous materials at low and medium frequencies by extending toward higher frequencies the quasistatic method based on a compression test. Indeed, classical quasistatic methods generally neglect the inertia effect of the porous sample and the coupling between the surrounding fluid and the frame; they are restricted to low frequency range (<100 Hz) or specific sample shape. In the present method, the porous sample is placed in a cavity to avoid a lateral airflow. Then a specific electrodynamic ironless transducer is used to compress the sample. This highly linear transducer is used as actuator and sensor; the mechanical impedance of the porous sample is deduced from the measurement of the electrical impedance of the transducer. The loss factor and the Young’s modulus of the porous material are estimated by inverse method based on the Biot’s model. Experimental results obtained with a polymer foam show the validity of the method in comparison with quasistatic method. The frequency limit has been extended from 100 Hz to 500 Hz. The sensitivity of each input parameter is estimated in order to point out the limitations of the method. Copyright (2010) Review of Scientific Instruments. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics .
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Olivier Doutres, Nicolas Dauchez, Jean-Michel Génevaux, Guy Lemarquand, et al.. "Ironless transducer for measuring the mechanical properties of porous materials" Review of Scientific Instruments Vol. 81 (2010)
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