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Acoustical Characteristics of a Visco-Elastic Material

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After having briefly given the fundamental equations of visco-elasticity, the author describes two experimental methods of study of the dynamic behavior of a solid polymer such as polymethyl methacrylate. The phase of the steady-state wave, which propagates along a bar excited by an oscillator, is measured; this phase is a function of the velocity and of the attenuation of the progressive waves. By means of these quantities, the real part of complex modulus and loss factor can be determined. The experimental results are in a range of frequencies of 2 to 60 kHz and at temperatures between −40 to +50 °C. A resonance flexural method permits the extension of the curves down to 10 Hz. By means of these experimental results, the behavior of the material over a great range of frequencies and temperatures can be predicted and a relaxation spectrum determined. The results of this work show also a β-transition at 20 °C.
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Document Type: Research Article

Publication date: January 1, 1970

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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