A Nonresonant Technique to Estimate the Mechanical Material Properties of a Viscoelastic Cylinder
NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
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This report describes an innovative method for measuring the complex Youngs modulus, complex shear modulus, and complex Poissons ratio of a viscoelastic cylinder. The new nonresonant technique is based on measured transfer functions that are obtained by vibrating the cylinder linearly and rotationally with two different-size masses on its free end. Both masses have their own individual transfer functions, which can be measured and combined to yield the unknown Youngs modulus and shear modulus values at every frequency where a measurement is made. Once these moduli are determined, Poissons ratio can be calculated. The test method is subjected to Monte Carlo simulations to show that it is relatively unaffected by external noise in the data.
- Properties of Metals and Alloys
- Numerical Mathematics