caa a22 4500 465814107 CHVBK 20180323112122.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF01339884 doi (NATIONALLICENCE)springer-10.1007/BF01339884 Rheology of an LDPE melt in reversing multi-step shear and elongational flows [Elektronische Daten] [M. Khan, R. Tanner] The hypotheses of separability and irreversibility, which have greatly improved the accuracy of constitutive models of the KBKZ type are tested in reversing step shear and elongational deformations. A reversing double-step deformation is a severe test for constitutive models and a new rheometer has been developed to perform this type of deformation, both in shear and elongation, in a single machine. Test results of a commercial low-density polyethylene melt are reported here with model predictions. In particular, the performance of the KBKZ-type integral model and a differential analogue is considered. Wagner's idea of irreversibility and the KBKZ-equivalent ideas of Larson are tested with these data. While these versions show a moderate agreement with experiment, the irreversible integral model gives an accurate fit and emerges clearly as the best description of polymer melts in these flows. Steinkopff, 1990 S eparability nationallicence irreversibility nationallicence KBKZ model nationallicence reversing step strains nationallicence Khan M. Department of Mechanical Engineering, University of Sydney, 2006, Sydney, N.S.W., Australia aut Tanner R. Department of Mechanical Engineering, University of Sydney, 2006, Sydney, N.S.W., Australia aut Rheologica Acta Steinkopff-Verlag 29/4(1990-07-01), 281-297 0035-4511 29:4<281 1990 29 397 https://doi.org/10.1007/BF01339884 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01339884 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khan M. Department of Mechanical Engineering, University of Sydney, 2006, Sydney, N.S.W., Australia aut NATIONALLICENCE 700 1- Tanner R. Department of Mechanical Engineering, University of Sydney, 2006, Sydney, N.S.W., Australia aut NATIONALLICENCE 773 0- Rheologica Acta Steinkopff-Verlag 29/4(1990-07-01), 281-297 0035-4511 29:4<281 1990 29 397 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer