Abstract
A simple procedure is developed for the identification of the linear viscoelastic properties of a material subjected to an implusive loading. Using Fourier transform of frequency, the complex compliance is obtained form the experimental data of a stress pulse propagating in a long rod. A linear viscoelastic model and parameters are subsequently determined based on the variation of the complex compliance with frequency. Experimental results on polymethyl methacrylate (PMMA) specimens show that the 3-parameter solid model can be applied over a wide frequency range. An analytical solution of the wave propagation problem is also given by use of the finite integral transform technique, and the adequacy of the determined model as well as the merit of the identification method proposed are discussed according to analytical predictions of strain-time history.
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