For a rubber-like solid, a spring is a first model of recoverable elasticity, while a viscous element can represent rate-dependent loss and delayed recovery. If the observed material has both an immediate extension and a further bounded delayed creep, a spring in series with a Kelvin-Voigt element is a simple linear-solid model:
(1)
The first term is immediate and recoverable; the second is delayed and also recoverable. A single Voigt element misses the immediate compliance, while a free series dashpot would predict unbounded flow that an intact crosslinked rubber need not show.
These are local small-strain analogues. Large-strain rubber elasticity is nonlinear, nearly incompressible and sensitive to temperature, loading history and internal damage. A small set of linear springs and dashpots cannot reproduce every amplitude, timescale or hysteresis loop.
TODO: Match the model to the unavailable practical-class observations. No particular measured rubber trace, specimen state or fitted constants are supplied.

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