Abstract
For deformations that are either very small or very slow, the theory of linear viscoelasticity is a unifying concept that provides relationships between the material functions that are determined using various types of deformations. For example, this theory tells us that in start-up flow, the shear stress growth coefficient, η +(t), is independent of shear rate. Furthermore, it provides a simple relationship between this material function and the tensile stress growth function, η + E (t), that is measured at the start-up of steady simple extension:
Thus, as long as the total strain or the maximum strain rate that occurs during a particular deformation is very small, no new information is obtained from the use of an extensional flow, once the linear viscoelastic behavior has been established by use of a shearing deformation. A corollary of this statement is that the response of a melt to any small or slow extensional flow can be calculated from a material function determined using a small or slow shearing experiment.
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© 1990 Van Nostrand Reinhold
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Dealy, J.M., Wissbrun, K.F. (1990). Extensional Flow Properties and Their Measurement. In: Melt Rheology and Its Role in Plastics Processing. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9738-4_6
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DOI: https://doi.org/10.1007/978-1-4615-9738-4_6
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