ZUSAMMENFASSUNG:Zur Beurteilung des viskoelastischen Verhaltens von Synthesefasern sind zeitaufwen-
SUMMARY:The evaluation of the viscoelastic response of synthetic fibres from stress-relaxation data over a wide range of time at different strain rates is very time-consuming. Therefore, mathematical models are used to describe the viscoelastic response. The characteristic of synthetic fibres is that already at very low deformation rates like an elongation < 1 Vo a nonlinear viscoelasticity has to be considered.Based on the analytical representation of isothermal viscoelastic behaviour by Boltzmann a new model making an assertion to the nonlinear viscoelasticity is proposed. Applying this model, the calculated values of moduli and relaxation tensions of the fibres Nomex@ and PEEK are in good agreement with the experimental values.
ZUSAMMENFASSUNG:Dieser Beitrag berichtet uber die UV-Laserbestrahlung von Elastomerfasern unter dem EinfluR verschieden groRer auRerer Spannungsfelder und unterschiedlicher Laserbedingungen. Aus der Literatur ist bekannt, d& synergetische Effekte, die als Ursache der Oberfltichenstrukturierung angesehen werden, sowohl durch Temperaturwie auch Spannungsfelder getrieben sein konnen. Daher sollen die beschriebenen Experimente untersuchen, welche der genannten Bedingungen in der Hauptsache zur Instabilittit des Systems und damit zur Oberfltichenstrukturierung fuhren.
SUMMARY:This paper reports the results of UV-laser-irradiations of elastomer fibres under application of varying external tensions on the fibres and under varying laser conditions. It is known that tension as well as temperature fields can lead to these synergetic effects that are supposed to cause the surface structuring by UV-laser-irradiation. Therefore the purpose of the reported experiments was to evaluate whether tension or temperature as the source of the system instabilities eventually lead to surface structuring.
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