Analysis of time-dependent non-linear stress-growth data for shear and elongational flow of a low-density branched polyethylene melt

@article{Wagner1976AnalysisOT,
  title={Analysis of time-dependent non-linear stress-growth data for shear and elongational flow of a low-density branched polyethylene melt},
  author={Manfred H. Wagner},
  journal={Rheologica Acta},
  year={1976},
  volume={15},
  pages={136-142}
}
  • M. Wagner
  • Published 1976
  • Materials Science
  • Rheologica Acta
SummaryA single integral constitutive equation is presented, which gives a reasonable description of the non-linear shear and elongational behavior of a low-density branched polyethylene melt at constant strain rate observed byMeissner. The memory function of this integral equation is a product of the memory function of Lodge's rubber like-liquid theory and a damping functionh = exp [ —n $$h = \exp [ - n\sqrt {I_2 - 3} ]$$ ], whereI2 is the second invariant of the Finger tensor. Stress- and… Expand
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New rheogoniometer data for stress development after initiation of a steady shear are presented for three polymer melts: a low‐density polyethylene, a high‐density polyethylene, and a polystyrene.Expand
Comparison of network theory predictions with stress/time data in shear and elongation for a low-density polyethylene melt
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Analysis of stress-growth data for simple extension of a low-density branched polyethylene melt
SummaryBased onLodge's theory of rubberlike liquids, a two-constants memory function is presented, which gives a qualitative description of the non-linear elongational behavior of a low-densityExpand
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Improvements to the Weissenberg rheogoniometer are necessary in order to measure the transient rheological properties of polymer melts correctly. The improvements reported concern the mechanicalExpand
Comparison of rubberlike-liquid theory with stress-growth data for elongation of a low-density branched polyethylene melt
SummaryThe non-linear behavior observed byMeissner can be qualitatively described by the rubberlike-liquid constitutive equations when the constants in the memory function are chosen to fit the dataExpand
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Available experimental data of shearing flows are used to test the BKZ fluid model. The strain‐energy function is assumed in the form of U=M(s)g(I1, I2), where M(s) is obtained from theExpand
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