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Complex Young's modulus measurement by incident wave extracting in a thin resonant bar
Zhengyu Wei1, Hong Hou1, Nansha Gao1
1School of Marine Science and Technology, Northwestern Polytechnical University, 710072 Xi'an, China.
The Journal of the Acoustical Society of America
|January 1, 2018
Summary
This study introduces a novel method to measure the complex Young
Area of Science:
- Materials Science
- Mechanical Engineering
- Physics
Background:
- Viscoelastic materials exhibit frequency-dependent mechanical properties.
- Accurate measurement of complex Young's modulus is crucial for material characterization.
- Traditional methods may have limitations in frequency range or experimental complexity.
Purpose of the Study:
- To present a new experimental method for determining the complex Young's modulus of viscoelastic materials.
- To validate the proposed method by comparing results with a standard dynamic mechanical thermal analyzer.
- To expand the applicability of wave-speed methods for mechanical parameter determination.
Main Methods:
- Generating a Butterworth impulse using an electromagnetic shaker to excite a thin bar sample.
- Extracting the incident wave within the bar to analyze material response.
- Measuring the complex Young's modulus across a wide frequency range (200–6500 Hz).
Main Results:
- The proposed method successfully determined the complex Young's modulus of viscoelastic materials.
- Experimental results showed excellent agreement with data from a standard dynamic mechanical thermal analyzer.
- The method is effective under atmospheric pressure and room temperature conditions.
Conclusions:
- The developed technique offers a simplified and effective approach for measuring viscoelastic material properties.
- This method enhances the frequency range achievable with wave-speed techniques.
- It presents a promising tool for direct determination of mechanical parameters in materials.