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Abstract

The background theory for the vibrating composite beam test method for the determination of the complex dynamic modulus of viscoelastic materials over broad ranges of frequency and temperature is summarized and general theoretical and experimental limitations of the method are discussed and illustrated. The vibrating composite beam method is shown to be capable of accurate complex dynamic modulus determinations (±5%) on materials with storage modulus (E') values of 10³ to 107 psi and loss factors of 0.02 to 1.2 over a frequency range of 30 to 12,000 hertz, if test sample geometries are chosen to minimize the effects of experimental errors. Test sample geometry selection criteria are identified to insure that the assumptions of the theory are satisfied and that experimental error magnification effects are minimized. This method has application in the study of the dynamic properties of polymeric materials, reinforced plastic ma terials and is particularly valuable in the evaluation of vibration damping materials.

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Determination of the Complex Modulus of Viscoelastic Two-Layer Composite Beams

Abstract

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