| Автор | W F O Pollett |
| Дата выпуска | 1955-06-01 |
| dc.description | A commercial grade of polythene has been tested between its melting point and 190° C at constant shear rates from 0.1 to 9.8 s<sup>-1</sup>. A disk-and-cone rheometer was used, and an improved technique introduced to provide a complete picture of the pressure distribution in the flowing melt by measuring each normal and tangential stress component individually. Changes of great complexity occurred with increasing shear, and varied with temperature and rate of shear, but simple relations could be established between the stress components and the measured strain recovery. These relations were not much affected by the imposed conditions and were in reasonable agreement with Weissenberg's theory when account was taken of an appropriate correction to his calculated recoverable strain. Moreover, the normal stress component in the axial direction was shown to be equal to that in the radial direction, in quantitative agreement with Weissenberg's theory. Changes occurred in the material during shearing, and increased with the applied shear and with the stress, but were reversible and vanished on resting. The observed behaviour is attributed to successive structural changes in the polymer, and an attempt is made to define equivalent structural states produced at different rates of shear. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Rheological behaviour of continuously sheared polythene |
| Тип | paper |
| DOI | 10.1088/0508-3443/6/6/304 |
| Print ISSN | 0508-3443 |
| Журнал | British Journal of Applied Physics |
| Том | 6 |
| Первая страница | 199 |
| Последняя страница | 206 |
| Аффилиация | W F O Pollett; W. T. Henley's Telegraph Works Co. Ltd., Research Laboratories, Gravesend, Kent |
| Выпуск | 6 |
