Abstract
THE place-exchange theory of plastic flow was originally developed by Becker1, to account for the flow of metals. More recently a somewhat similar theory has teen advanced by Eyring2 to account for flow in polymeric materials. In the latter theory the flow process is regarded as the movement of a molecule, or segment of a molecule, from one position in the plastic to a neighbouring one, under the influence of thermal energy. If E be the potential barrier separating two positions, and f the stress, then the activation energy for the process is written as E–bf, where b is a constant involving the dimensions of the 'unit of flow'. The rate of flow θ may then be written θ = const. e-(E-bf)/RT. . . (1)
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References
Becker, Phys. Z., 26, 919 (1925).
Tobolsky, Powell and Eyring, "Chemistry of Large Molecules", 125 (Interscience, 1943).
Eyring, J. Chem. Phys., 4, 283 (1936).
Dillon and Johnston, Physics, 4, 225 (1933). Also Houwink, "Physikalische Eigenschaften und Feinbau von Natur- und Kunstharzen" (Akad. Verlag. Leipzig, 1934).
Andrade, Proc. Roy. Soc., A, 84, 1 (1910); 90, 329 (1914); 138, 348 (1932).
Van der Waals, Proc. Acad. Amsterdam, 21, 743 (1918). Andrade, Phil. Mag., 17, 497, 705 (1934).
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ELEY, D., PEPPER, D. Place-Exchange Theory of Plastic Flow, as Applied to Polymers. Nature 154, 52 (1944). https://doi.org/10.1038/154052a0
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DOI: https://doi.org/10.1038/154052a0
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