Abstract
The rational design of structures incorporating damping materials for the control of vibration and noise requires a knowledge of the dynamic properties of vibration damping materials, including the effects of frequency, temperature, and strain levels. This paper is a review of several techniques which have been utilized for determining material damping properties, with special emphasis on the practical limitations of each method. It is pointed out that no one measurement technique is universally applicable to all damping materials since they range in stiffness from very soft foams and adhesives to relatively stiff unconstrained layers such as damping tiles and vitreous enamels. Furthermore, damping measurements are frequently required at temperatures ranging from −60° to + 1000°C (−76° to + 1832°F). The applicability of various measurement techniques to different classes of materials is discussed, along with pitfalls commonly encountered due to the magnification of errors in the reduction of data.
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