Nonresonant Technique for Estimation of the Mechanical Properties of Viscoelastic Materials
Patent application, Filed 19 Jan 2001
OFFICE OF NAVAL RESEARCH ARLINGTON VA
Pagination or Media Count:
A method for estimating the real and imaginary Youngs modulus, shear modulus and Poissons ratio of a specimen at an excitation frequency. The specimen is first joined to a reciprocating test apparatus at one end with a mass positioned at the other end. The test apparatus reciprocates at the excitation frequency and accelerations are recorded at each end of the specimen. The Youngs modulus is calculated from the recorded accelerations. The specimen is then joined to a reciprocating rotational test apparatus at one and with a rotational inertial mass positioned at the other end. Accelerations are recorded upon subjecting the specimen to rotational reciprocating at the excitation frequency. The shear modulus is calculated from these accelerations. Poissons ratio can be calculated from the Youngs modulus and the shear modulus at the excitation frequency. All of the calculations may be performed giving both real and imaginary values.
- Test Facilities, Equipment and Methods