Special yarns, resp. Yarns for technical applications are usually exposed to high dynamic loading during processing and in final use. Therefore, they fundamentally differ from traditional textile yarns regarding their requirements- and performance-profile. Interpretation of the material behaviour under dynamic load conditions is still characterized by parameters, which are determined under standard tensile test with prescribed testing speed and strain rates.
Due to their viscoelastic properties the behaviour of polymeric yarns depends on the loading speed. A suitable standard test method was missing for the determination of mechanical properties under high strain rate – especially the stress-strain properties of filament yarns with or without twist. Introduction of high-speed tests provide the valid experimental data to describe the material behaviour under high load conditions. Suitable standards for the execution of high-speed tensile test for textiles are still to be developed. Do you have information on recent developments and results related to this topic, especially, under different temperature conditions?
Hi Lawrence,
Thanks for your attention to my question.
In our research we have used a Zwick HTM 2008 high-speed servo-hydraulic tensile testing machine, which maximum test load is up to 20 kN. We have carried out tests using PA and PET multi-filament yarns (50 - 90 tex). The maximum calculated tenacity was approx. 90 cN/tex.
Regards,
Zoran.
Please check the attached link which might be related to your question.
In that work, we were trying to investigate an alternative method for analyzing the performance of air-jet spun yarns (traditional materials and not a high tenacity as the one you are referring to) under dynamic loading.
Article Dynamic Properties of Air-Jet Yarns Compared to Rotor-Spun Yarns
I appreciate your answer Mohamed. Your article is interesting for me although it describes the tests on "normal" yarns.
As your research areas include spinning, I am sending you the link to one of our previos articles on compact yarns: Compact Spinning for Improved Quality
of Ring-Spun Yarns, http://www.fibtex.lodz.pl/43_09_30.pdf . Hope it can be interesting to you.
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