Theorie und molekulare Deutung technologischer Eigenschaften von hochpolymeren Werkstoffen

Berry, J. P.; Ferry, J. D.; Jenckel, E.; Kast, W.; Mark, H. F.; Meskat, W.; Rosenberg, O.; Schwarzl, F.; Staverman, A. J.; Stein, R. S.; Stuart, H. A.; Thurn, H.; Treloar, L. R. G.; Vegt, A.K. van der; Würstlin, F.

doi:10.1007/978-3-662-01378-6

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“…The handling of the measured data can be standardised by application of a universal evaluation, thus allowing to reduce the measuring e orts and time. [3] A wellknown example of a mechanical model was developed by Maxwell (Maxwell model [10] [3]). Already in 1868 Maxwell described the elastic deformation with a spring (Hooke's law) and the viscoelastic deformation with a dashpot (Newton's law).…”

Section: Introductionmentioning

confidence: 99%

“…[1] For a more realistic description it is recommended to connect several Maxwell or Voigt elements in series, which is then called generalized Maxwell model and generalized Voigt model, respectively. [3] While the importance of mechanical models increased, several scientists proposed their own ideas to modulate the mechanical properties. In 1945, Alfrey and Doty [1] have made the a ord to summarize and compare all existing methods, describing the properties of incompressible, isotropic, viscoelastic materials.…”

Section: Introductionmentioning

confidence: 99%

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Revisiting Relaxation Model towards Prediction of Longterm Mechanical Behavior of Semicrystalline Fibers?

Schippers¹,

Bahners²,

Gutmann³

et al. 2021

Preprint

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<p>Tensile testing is a well-established method to assess the maximum strength of a material, while relaxation tests are used to evaluate the viscoelastic behaviour of a polymer. Because of slow viscoelastic changes, significant measurement times are required for reliable descriptions. Therefore the relaxation tests are usually combined with lifetime prediction models to reduce the experimental load. Various traditional models use the time-temperature superposition principle while modificated relaxation models are e.g. based on the time-strain superposition principle (TSSP). Both variations require several measurement series to set up a relaxation master curve (RMC). The basic assumption is that a higher strain corresponds to a higher temperature and a longer load duration, respectively. The paper describes a new model approach which allows to predict the longterm behaviour by using a reduced number of measurements as compared to widely models. The new model is based on the well-known Maxwell model and assumes a mean relaxation time in combination with a relaxation coecient. These parameters account for the inhomogeneity of the individual polymer chains. A dimensionless number, similar to the relaxation coecient, has been successfully introduced for the Weibull distribution and the particle size distribution. The new model allows to derive master curve from one measurement series at a single strain by fitting the data to the model equation.<br></p>

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Section: Introductionmentioning

confidence: 99%