Application of a vibrational impedance head to the measurement of the complex elastic modulus by the driving point impedance method

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Authors

  • W. ZIÓŁKOWSKI Institute of Experimental Physics, University of Gdańsk, Poland
  • A. ŚLIWIŃSKI Institute of Experimental Physics, University of Gdańsk, Poland

Abstract

A rheological model of an impedance head is considered and the expression for its mechanical impedance Z_H has been derived. The numerical results of the modulus |Z_H| and the experimental data were compared. Also, the phase angle dependence of the measuring head Φ_num for a given rheological model and the experimental curve Φ_exp of the Brüel-Kjaer type 8001 impedance head are compared. The presented model of the measuring head impedance was used to determine the impedance for the following mechanical system: beam-measuring head-element joining the head and the sample. The experimental results of the complex modulus of elasticity against frequency for samples of a few polymers: plexiglass, PVC and Razotex B are presented as a verification of the model.

References

[1] W. ZIÓŁKOWSKI, A. ŚLIWIŃSKI, Journal of Sound and Vibration 80, 2, 209-222 (1982).

[2] W. ZIÓŁKOWSKI, A. ŚLIWIŃSKI, Journal of Sound and Vibration, 97, 1, 11-21 (1984).

[3] J. C. SNOWDON, Vibration and shock in damped mechanical system, New York-London-Sydney: John Wiley and Sons Inc. 1968.

[4] L. CREMER, H. HECKL, Structure borne sound. Transl. E. Ungar Berlin-New York 1973.

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