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Ultrasonic material characterization using large-aperture PVDF receivers.

J C Adamowski1, F Buiochi, R T Higuti

  • 1Escola Politécnica da Universidade de São Paulo, Av. Prof. Mello Moraes, 2231, 05508-900 São Paulo, SP, Brazil. jcadamow@usp.br

Ultrasonics
|October 27, 2009
PubMed
Summary
This summary is machine-generated.

A large-aperture polyvinylidene fluoride (PVDF) receiver accurately measures liquid density and composite material elastic constants. This advanced ultrasonic method minimizes diffraction errors for precise material characterization.

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Area of Science:

  • Materials Science
  • Ultrasonic Testing
  • Non-Destructive Evaluation

Background:

  • Accurate measurement of material properties is crucial for engineering applications.
  • Conventional ultrasonic methods can be subject to diffraction and dispersion errors.
  • Polyvinylidene fluoride (PVDF) offers unique properties for transducer applications.

Purpose of the Study:

  • To evaluate the efficacy of a large-aperture PVDF receiver for precise material property measurements.
  • To compare the performance of PVDF receivers with conventional ultrasonic transducers.
  • To determine the elastic constants of composite materials using ultrasonic phase velocity.

Main Methods:

  • Utilized a 70-mm-diameter PVDF membrane receiver for liquid density measurements.
  • Employed ultrasonic phase velocity measurements for elastic constant determination.
  • Compared results from PVDF receivers with conventional transducers and tensile tests.

Main Results:

  • Achieved 0.2% accuracy in liquid density measurements using the PVDF receiver.
  • Demonstrated that large-aperture PVDF receivers significantly reduce diffraction errors in velocity measurements.
  • Elastic constants of a carbon fiber reinforced polymer were accurately determined and validated.

Conclusions:

  • Large-aperture PVDF receivers are highly effective for accurate liquid density and composite material elastic constant measurements.
  • The PVDF method overcomes limitations of conventional ultrasonic techniques, particularly diffraction effects.
  • This approach provides a reliable and precise tool for material characterization in non-destructive evaluation.