Measurement systems for distribution of relaxation and retardation times

Authors:
Aldis Kalpinsh;Vairis Shtrauss
Affiliations:
Institute of Polymer Mechanics, University of Latvia, Riga, Latvia;Institute of Polymer Mechanics, University of Latvia, Riga, Latvia
Venue:
Proceedings of the 15th WSEAS international conference on Systems
Year:
2011

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Abstract

There is a widespread belief in scientific literature on material research that the distribution of relaxation and retardation times (DRRT) is a non-measurable quantity. In the presented contribution, we try to revise this belief. Based on the recently developed functional filtering approach for DRRT recovery, measurement systems are proposed to develop executing an active measurement experiment by exciting material with the specific stimulus, measuring material's responses sampled geometrically in time- or frequency-domain and processing them by the appropriate DRRT recovery filters. Design and algorithms of DRRT recovery filters are considered and practical implementations of DRRT measurement systems are proposed executing measurement experiments by exploiting the standard excitations, such as the Heaviside step function, the Dirac delta function and the steady-state multi-harmonic one.