ViscoData for the adaptation of viscoelastic
models 

For Hightech
plastics as well as rubber products it is necessary to predict the
viscoelastic behaviour of those materials under different temperature and
loading conditions. …although rubber elongates up to several hundred percent with relative small deviation from reversibility, in practice, deviations from such elastic behaviour are to be expected. For example, the disaster of the Columbia Space shuttle in 1986 resulted from such peculiar viscoelastic behaviour of a rubber seal at low temperature. This behaviour can be characterized by the socalled Prony series. This Prony series consists of a sum of several exponential functions with different intensity coefficients and relaxation time constants. From various experiments appropriate to characterize viscoelastic properties a so called master curve is build up. With an evolutionary algorithm the intensity coefficients and time constants of the Prony series are adapted in such a way, that the series describes the experimental data with minimal error. The such defined Prony series is equivalent to the relaxation spectra associated to the material in question. So this enables one to predict further important behaviours of the material (for further reference see also attached PDFfiles) which are not directly measured but can now be derived analytically. Please ask for demonstration programs, if you want to try the software before buy. Further Information: The pdffile Short_Introduction.pdf gives an introduction to ViscoShift and
ViscoData. The conference paper KGK_FEM_KONG_99_Nov_x5.pdf (in German) shows how to get viscoelastic
material parameters from thermorheologic experiments with help of the
evolution strategy. The ViscoData_Bulletin_03.2005.pdf shows how
to use results of ViscoData as input of MSC.MARC. contact: Prof. Dr.Ing. Michael Herdy, Kaiserdamm 4, 14057 Berlin
last changes: 28.05.2023 