Young's modulus estimation of a soft viscoelastic rod using optical elastography.
Jiayuan Zhu1, François Legrand2, Sibylle Grégoire1
1LabTAU, INSERM, Centre Léon Bérard, Université Claude Bernard Lyon 1, F-69003 LYON, France.
The Journal of the Acoustical Society of America
|October 21, 2025
Summary
This study quantifies Young
Area of Science:
- Biomedical Engineering and Medical Imaging
- Materials Science and Mechanics
Background:
- Viscoelastic rods are crucial in medical imaging applications.
- Accurate determination of material properties like Young's modulus is essential for quantitative analysis.
Purpose of the Study:
- To investigate longitudinal guided waves in soft viscoelastic rods.
- To reconcile quantitative Young's modulus estimation using tensile tests and wave velocity measurements.
- To compare static and dynamic material property measurements.
Main Methods:
- Experiments utilized optical elastography with a high-speed camera on silicone-based rods.
- Wave speed and attenuation were determined using transient and modal analysis.
- Viscoelastic parameters were extracted using a Zener model and compared with tensile test data.
Main Results:
- The material exhibited linear elastic behavior up to 20% deformation.
- A three-element Zener rheological model accurately described the material's complex frequency-dependent behavior.
- Good agreement was found between static (tensile test) and dynamic (wave measurement) estimations of Young's modulus.
Conclusions:
- The study successfully reconciled static and dynamic methods for Young's modulus estimation in viscoelastic rods.
- Despite material nonlinearity and complex rheology, the proposed methods provide reliable quantitative material property assessment.
- This work advances accurate material characterization for applications in medical imaging.
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