material property evaluation

Dynamic material property evaluation of piezoelectric materials using the impulse excitation technique complying with the ASTM E1876 standard.

Experimental setup for dynamic material property evaluation complying with ASTM E1876
Experimental setup for dynamic material property evaluation complying with ASTM E1876-22.

Dynamic Material Property Evaluation

This project aims to determine the dynamic Young's modulus, shear modulus, and Poisson's ratio of the materials used in transducer fabrication and prototype development. It ensures the reliability of FEM-based simulations and incorporates material-specific properties into the design process.(Kim et al., 2025; Kim† et al., 2026)

Standard

ASTM E1876-22: Standard Test Method for Dynamic Young's Modulus, Shear Modulus, and Poisson's Ratio by Impulse Excitation of Vibration

Experimental Setup
  • Test specimen and fixture complying with ASTM E1876-22
  • Spectrum analyzer, Measurement microphone, Impact hammer
Dynamic material property measurement results showing Young's modulus and shear modulus
Material Source / Method $E$ [GPa] $G$ [GPa] $\nu$ [-]
Al 7075-T651 MatWeb 71.700 26.955 0.330
E1876 73.268 26.405 0.387
Rel. Err. [%] 2.187 -2.039 17.390
SS 316L MatWeb 193.000 75.391 0.280
E1876 190.358 76.854 0.238
Rel. Err. [%] -1.369 1.940 -14.841
Experimental results (left) and comparison of the ASTM E1876 measurements with reference MatWeb data (right).
Experimental setup for piezoelectric ceramic ring impedance analysis
Experimental setup for piezoelectric material property characterization using impedance analysis.

Piezoelectric Material Characterization

Verification of piezoelectric material constants (transversely orthotropic Young's modulus, Poisson's ratio, damping coefficient, piezoelectric constants, and permittivity) through impedance analysis of ceramic rings, and validation of their consistency by comparing experimental measurements with FEM-based simulations.(Kim et al., 2025; Kim† et al., 2026)

Experimental Setup
  • Impedance analyzer, Test fixture
Results

Demonstrated that the agreement between experimental impedance (blue dash-dotted curve) and simulated response (red solid curve) enables evaluation of the validity of piezoelectric property data provided in supplier datasheets.

Piezoelectric impedance measurement showing agreement between experiment and FEM
Piezoelectric impedance measurement showing discrepancy indicating unreliable supplier data
Comparison between experimental measurements and FEM simulations. Agreement (left) validates supplier data, while discrepancy (right) indicates unreliability.
Experimental setup for PE/SE curve measurement using laser Doppler vibrometer and Sawyer-Tower circuit
Experimental setup for PE/SE curve measurement of piezoelectric/electrostrictive materials using a laser Doppler vibrometer and Sawyer-Tower circuit.

PE/SE Curve Measurement

Evaluation of piezoelectric properties of powder- or ink-supplied piezoelectric/electroactive polymer materials, considering possible property variations due to mixing with other substances during device fabrication.(Park† et al., 2024)

Experimental Setup
  • Laser Doppler vibrometer, Sawyer-Tower circuit
  • Polymer film cantilevers were prepared as test specimens, and a custom fixture with pogo pins was designed to prevent sample damage during electrical measurements.
Results

Simultaneous acquisition of polarization-electric field (PE) and strain-electric field (SE) curves was achieved for piezoelectric polymers; for electrostrictive polymers, the effective piezoelectric constant ($e_{31,f}$) under applied electric field bias was extracted.

Custom fixture with pogo pins for piezoelectric polymer film measurement
Polarization-electric field and strain-electric field hysteresis curves of piezoelectric polymer
Extracted effective piezoelectric constant e31f under applied electric field bias
Custom fixture with pogo pins (left), typical PE/SE curves (middle), and extracted effective piezoelectric constant ($e_{31,f}$) (right).

Related works

2026

  1. Nat. Commun.
    Dual-domain metamaterials co-integrated with a compact ultrasonic transducer for highly directional audio generation

2025

  1. J. Acoust. Soc. Am.
    Design, Analysis, and Experimental Validation of a Stepped Plate Parametric Array Loudspeaker
    Design, Analysis, and Experimental Validation of a Stepped Plate Parametric Array Loudspeaker
    Woongji Kim, Beomseok Oh, Chayeong Kim, and Wonkyu Moon*
    The Journal of the Acoustical Society of America, Sep 2025
    DOI Related
    Project

2024

  1. Small
    Interactive Deformable Colored Sound Display Achieved with Electrostrictive Fluoropolymer and Halide Perovskite
    Interactive Deformable Colored Sound Display Achieved with Electrostrictive Fluoropolymer and Halide Perovskite
    Doowon Park†, Woongji Kim†, Chaeyong Park, Jun Choi, Arup Ghorai, Gilwoon Lee, Seungmoon Choi, Wonkyu Moon*, and Unyong Jeong*
    Small, Sep 2024
    DOI

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