Retardation is the delayed response to an applied force or stress and can be described as "delay of the elasticity".[1]
Ideal elastic materials show an immediate deformation after applying a jump-like stress, and an immediate reformation after removing the stress afterwards in the jump-like form again. For viscoelastic samples, this elastic behaviour occurs with a certain time delay.
The term "relaxation time" has been described. It is used in combination with tests presetting the strain (deformation) or strain rate (shear rate), e.g., when performing relaxation tests.
On the other hand, the term "retardation time" is used for tests when presetting the stress, e.g., when performing creep tests.
See also
editReferences
edit- ^ Mezger, Thomas G. (1 January 2006). The Rheology Handbook: For Users of Rotational and Oscillatory Rheometers. Vincentz Network GmbH & Co KG. ISBN 9783878701743 – via Google Books.
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