Guide
How to Measure Elastic Properties with Impulse Excitation
Determine Young's modulus (E), Shear modulus (G), and Poisson's ratio (P) non-destructively in seconds.
The Method
A light mechanical impulse excites the test specimen, causing it to vibrate at its natural flexural and torsional resonance frequencies.
- Flexural frequencies → Young’s modulus (E)
- Torsional frequencies → Shear modulus (G)
- Both combined → Poisson’s ratio (calculated iteratively)
These elastic moduli are determined from the measured resonance frequencies combined with the specimen’s geometry, mass, and density, following internationally recognized standards.
Standards Compliance
- ASTM E1876 — Dynamic Young’s Modulus, Shear Modulus, and Poisson’s Ratio by Impulse Excitation of Vibration
- ISO 22259 — Determination of elastic moduli by resonance frequency method
What Each Property Tells You
Young's Modulus (E)
Measures stiffness—resistance to elastic deformation under tension or compression.
Higher E = stiffer material
Shear Modulus (G)
Measures resistance to shear deformation—how the material responds to twisting forces.
Related to E by: G = E / 2(1+ν)
Poisson's Ratio (ν)
Ratio of lateral strain to axial strain—how much a material contracts sideways when stretched.
Typical range: 0.2 to 0.5
Key Advantages
Non-Destructive
Material remains within elastic regime—no damage
Highly Repeatable
Same sample can be tested multiple times
Fast
Results in seconds, not minutes
Full-Body Measurement
Evaluates entire component, not just local points
Applicable Materials
GrindoSonic systems are used globally to help researchers develop and test new materials including:
- Ceramics and advanced ceramics
- Metals and alloys
- Polymers and composites
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