Abstract
THE shear of a non-Newtonian body, that is, a plastic material or a high-polymeric pseudo-fluid, follows a mechanism showing analogy to that of a true fluid as expressed by the Maxwell equation; but whereas the relaxation of true fluids is purely time-dependent, in the case of non-Newtonian bodies a critical angle of tangential deformation characteristic for each material marks a threshold limit of elastic deformation before relaxation sets in. This elastic limit in plastic materials corresponds to the separation of a secondary aggregate into primary particles and, in the case of pseudo-fluids, to the inception of unkinking of the polymer molecules.
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DE WAELE, A., LEWIS, G. The Rheological Curve. Nature 172, 298 (1953). https://doi.org/10.1038/172298a0
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DOI: https://doi.org/10.1038/172298a0
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