Definition
Viscoplasticity is the theory which describes the rate-dependent (rate-sensitive) plastic behavior of solids. Rate dependence should be understood as a material sensitivity to rate of the deformation induced by external loads or shortly as a sensitivity to rate of external loads. It is important that rate-independent plastic response can be obtained as a limit case of viscoplastic flow. Furthermore, viscoplasticity belongs to implicit nonlocal models (Sumelka and Lodygowski, 2017) and can also be interpreted as the regularization of rate-independent flow (Simo and Hughes, 1997). Another important property is the dispersive nature of viscoplastic waves, what is crucial from the point of view of strain localization phenomena (Glema, 2004). In consequence, viscoplastic material shows not only instantaneous permanent deformation, due to applied loads, but undergoes also a creep flow.
General Remarks
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Sumelka, W., Ćodygowski, T. (2018). Viscoplasticity. In: Altenbach, H., Ăchsner, A. (eds) Encyclopedia of Continuum Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-53605-6_226-1
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