Identification of the Process of Dynamic Stretching of Threads in Warp Knitting Technology Part II: Experimental Identification of the Process of Stretching Threads, with Verification of Rheological Models

• Autorzy: Prążyńska A. , Mikołajczyk Z.

Identyfikatory

DOI

10.1515/aut-2017-0016

• Języki publikacji: EN

Abstrakty

EN

The study is a continuation of the first part of the publication, concerning the theoretical analysis of sensitivity of rheological models of dynamically stretched thread. This part presents the experimental research on the characteristics of stretching forces as a function of time, in the context of comparing the obtained results with theoretical data. The selected research material was three types of polyester silk threads with linear densities 84, 110 and 334 dtex. During the tests, threads of 400 to 1300 mm were stretched at speeds in the range of V ∈ [0.65, 1.47] m/s, which corresponds to the knitting speed n ∈ [700, 1600] courses/min. An original measuring device for empirical identification of dynamic processes of threads stretching was used during the tests. In total, 36 tests variants were performed. The procedures of mathematical equivalence were also worked out for the rheological models of Kelvin-Voigt, Zener and the three-parameter Standard model 2, which enabled the description of threads stretching phenomena in technological processes with the help of generalized rheological model, taking into account the visco-elastic qualities of threads. Experimental results showed that for the assumed deformation speeds ε(t) ∈ [0.53, 4.00] 1/s, the open three-parameter models – Standard model 2 and Zener model most reliably describe the stretching process.

Słowa kluczowe

EN

rheological models; dynamic stretching of threads; knitting on warp-knitting machines; empirical verification of rheological model

PL

modele reologiczne; rozciąganie nici dynamiczne; dzianie w maszynach dziewiarskich; empiryczna weryfikacja modelu reologicznego

• Wydawca: Lodz University of Technology, Faculty of Material Technologies and Textile Design
• Czasopismo: Autex Research Journal
• Rocznik: 2018
• Tom: Vol. 18, no. 1
• Strony: 1--6
• Opis fizyczny: Bibliogr. 11 poz.

Twórcy

autor

Prążyńska A.

• Department of Knitting Technology, Lodz University of Technology 116 Żeromskiego St., 90-924 Łódź, Poland

autor

Mikołajczyk Z.

• Department of Knitting Technology, Lodz University of Technology 116 Żeromskiego St., 90-924 Łódź, Poland

Bibliografia

• [1] Prążyńska A., Mikołajczyk Z. Identification of the process of dynamic stretching of threads in warp knitting technology. Part I: Theoretical analysis of the susceptibility of rheological models of the process of stretching textile threads. 2017, DOI: 10.1515/aut-2016-0039.
• [2] Kopias K. Structure and technology of warp – knitted fabrics, copyright by Lodz University of Technology 2010, 188 p.
• [3] Mikołajczyk Z. Identification of knitting processes of anisotropic warp-knitted structures produced on warp-knitting machines. (in Polish) Scientific Notebook nr 1047, copyright by Lodz University of Technology 2009, 234 p.
• [4] PN-EN ISO 2062:1997 Textiles. Yarns from packages. Determination of single-end breaking force and elongation at break.
• [5] Derski W., Ziemba S. Analysis of rheological models. (in Polish) Polish Scientific Publishers PWN, Warsaw 1968, Issue I.
• [6] W. Kobza, J. Gluza, Mechanics and technical rheology, Script for universities (in Polish), Technical University of Lodz, Lodz, 1991.
• [7] G. Urbańczyk, Physics of fibre (in Polish) Technical University of Lodz, Lodz, 2002.
• [8] Barnes H.A., Hutton J.F., Walters K. An introduction to rheology. Elsevier science Publishers B.V., ISBN 0-444-87140-3, 1989, 201 p.
• [9] Moczo P., Kristek J. & Franek P. Lecture Notes on Rheological Models. DAPEM FMPI CU, Bratislava 2006.
• [10] Mainardi F., Spada G. Creep, Relaxation and Viscosity Properties for Basic Fractional Models in Rheology, The European Physical Journal, Special Topics, Vol. 193 (2011) 133-160.
• [11] Marques S. P. C and Creus G. J., Computational Viscoelasticity, Springer Briefs in Computational Mechanics, DOI: 10.1007/978-3-642-25311-9_2, 2012, 124 p.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).