I need to determine the stress-strain relationship of flax yarns. To calculate the nominal stress, I need to know the cross-sectional area (original area) of the flax yarn before the application of the tensile load. However, the cross-section of the flax yarn changes significantly when the yarn is pulled or straightened. Do you have any recommendation or reference for this?
Please see the following link to get an idea about to measure the cross-sectional area of a yarn:
http://indiantextilejournal.com/articles/FAdetails.asp?id=4360
Could this be an option? https://www.saiglobal.com/PDFTemp/Previews/OSH/ISO/990615_0950/T006837E.PDF
Dear Anders Persson ,
Thank you for the recommended standard. However, I cold not find any recommended method to measure the cross-sectional area of a single piece of natural yarn.
Additionally, the ultimate strain of the yarns varies and it depends upon how tight the yarn is set up in UTM testing machine before the application of the tensile load. Do you have any recommendation or reference for this?
Thanks
Dear Md. Abdur Rahman ,
Thanks for sharing such a helpful link. In that link yarn linear density testing is recommended for measuring the cross-section area of the yarns. My yarns' length changes considerably from the situation the yarns are left loose to the situation that the yarns are stretched. Could you please advise how loose/tight the yarn should set (preferably in quantity) before measuring the length?
A hand run winder (1 m/rev) can be adjusted to give some winding resistance to straighten out the crimp in a repeatable way.
Please see the following link
https://hal.archives-ouvertes.fr/hal-00743446/document
Dear Sir,
Please kindly go through this paper.
https://www.sciencedirect.com/science/article/pii/S0144861718314152
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