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Aspects of the yield behavior in poly(ethylene terephthalate) fibers
Author(s) -
Sweet G. E.,
Bell J. P.
Publication year - 1979
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760190104
Subject(s) - materials science , elongation , composite material , yield (engineering) , poly ethylene , spinning , shear (geology) , deformation (meteorology) , protein filament , melt spinning , shear band , fiber , ethylene , ultimate tensile strength , biochemistry , chemistry , catalysis
The yield behavior during cold drawing of commercially spun poly(ethylene terephthalate) (PET) filament yarn was investigated. Microscopic examination revealed the presence of inherent flaws within the spun filaments; these act as points for localized stress concentration. These inhomogeneities appear to be either internal cracks or crazes developed during the fiber melt spinning process. During elongation, stress magnification at these flaws results in shear band formation, indicating the onset of inhomogeneous yielding. At the yield bend in the load‐elongation curve a circumferential crack propagates within these shear band regions. This yield crack develops into the classical neck geometry which further localizes additional plastic deformation within the sample at the neck.