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A dynamic Young's modulus measurement system for highly compliant polymers.

François M Guillot1, D H Trivett

  • 1George W Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, USA. francois.guillot@me.gatech.edu

The Journal of the Acoustical Society of America
|September 30, 2003
PubMed
Summary

A new system measures the complex Young

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Area of Science:

  • Materials Science and Engineering
  • Polymer Physics
  • Mechanical Engineering

Background:

  • Characterizing the mechanical properties of elastomers under various conditions is crucial for their application.
  • Existing methods may have limitations in determining the complex Young's modulus of highly compliant materials at elevated hydrostatic pressures and temperatures.
  • Understanding elastomer behavior under combined pressure and temperature is essential for predicting performance in demanding environments.

Purpose of the Study:

  • To present a novel experimental system for determining the complex Young's modulus of highly compliant elastomers.
  • To enable measurements as a function of elevated hydrostatic pressure and temperature.
  • To investigate the effects of lateral inertia on wave propagation and its impact on modulus measurements.

Main Methods:

  • A sample bar adhered to a piezoelectric shaker mounted vertically within a pressure vessel.
  • Two independent techniques: resonant method (100 Hz - 1 kHz) and wave propagation method (up to 5 kHz), both using laser Doppler vibrometers.
  • Temperature control via an environmental chamber, with hydrostatic pressures up to 2.07 MPa and temperatures from -2°C to 50°C.

Main Results:

  • The system successfully obtained Young's modulus data for two commercial elastomers (Rubatex R451N, Goodrich Thorodin AQ21) across the specified frequency, pressure, and temperature ranges.
  • Experimental data demonstrated the influence of lateral inertia on wave propagation, leading to dispersive effects.
  • The study quantified the impact of these dispersive effects on the accuracy of Young's modulus measurements.

Conclusions:

  • The developed system provides a robust method for characterizing elastomer viscoelastic properties under challenging conditions.
  • The findings highlight the importance of considering lateral inertia in dynamic mechanical analysis of elastomers.
  • This research contributes to a more accurate understanding and prediction of elastomer performance in high-pressure and variable-temperature applications.

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