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Textile Research Journal
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Effects of Repeated Extension and Recovery on Selected Physical Properties of ISO-301 Stitched Seams

Part II: Theoretical Model

J. Webster

Department of Consumer Sciences, Clothing and Textile Sciences, University of Otago, Dunedin, New Zealand

R.M. Laing

Department of Consumer Sciences, Clothing and Textile Sciences, University of Otago, Dunedin, New Zealand

R.L. Enlow

Department of Mathematics and Statistics, University of Otago, Dunedin. New Zealand

A theoretical viscoelastic model based on the four-element Burgers model is devel oped to predict changes in load with time of ISO-301 stitched seams under longitudinal loading subjected to extension/recovery cycling at a constant rate of extension. Param eters calculated from experimental stress relaxation curves are used to determine the theoretical relationship between load and time for tensile cycling. The model gives good agreement with experimental stress relaxation behavior of seams over the range 0-30 seconds. Theoretical predictions of load versus time give the best agreement with experimentally derived tensile cycling curves for seams cycled between the lowest extension limits. The exact solution of the theoretical model consists of a double ex ponential expression, suggesting that two processes are responsible for the change in load of seams with tensile cycling, a result consistent with the statistical model for seam ageing and with visual observations described in Part I of this series.

Textile Research Journal, Vol. 68, No. 12, 881-888 (1998)
DOI: 10.1177/004051759806801202
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