Parameter identification for viscoelastic materials |
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Authors: | H Buggisch P Mazilu H Weber |
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Institution: | (1) Institut für Mechanische Verfahrenstechnik und Mechanik, Universität Karlsruhe (TH), Postfach 69 80, D-7500 Karlsruhe 1, F.R.G. |
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Abstract: | Starting from the general stress-strain relation for a linear Boltzmann-Volterra material, which is in agreement with the principle of inertia, a new identification procedure is proposed. Instead of running one long-range relaxation experiment, following asingle suitably specified deformation history, material characterization is done using the data ofn short relaxation experiments followingn different deformation histories. To interpret these data a direct non-iterative algorithm has been developed. Compared with other methods, for example curve fitting by using Gauss' method, this direct method is numerically stable and allows a simple direct evaluation of the error due to the scattering of experimental data. The method has been applied to the determination of the relaxation times of an unsaturated polyester material. |
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Keywords: | Boltzmann-Volterra material stress-strain relation relaxation experiment parameter identification principle ofinertia |
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