Abstract
ABSTRACTSound and vibration damping materials are used on ships, aircraft, and space structures. The damping properties of a given damping materia! are a function of: mix ratio, filler concentration, curing conditions, etc. There is a growing need to develop quality control methods for these materials and to bring the required instrumentation into the factory and shipyard environment.This paper describes two QC methods that have been developed for use in a factory or shipyard. These methods utilize Fourier Transform Infra‐Red (FTIR) spectroscopy and a custom‐made resonance apparatus (RA) for measuring dynamic mechanical properties. The two sets of instrumentation and the special packaging of them for use in a harsh environment are described. The instruments are computer driven and software was written to automate data collection and analysis.The FTIR method determines mix ratio of the reactive components of the damping material and the RA method measures the dynamic shear modulus and loss factor, which is a direct measure of the damping properties. The use of these methods is demonstrated for a typical damping material. Samples were made with a wide range of mix ratios for the reactive components and the properties of the materials were measured.
Published Version
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