1] is the viscosity coefficient of the Abel dashpots
The SLS model consists of a spring in series with a dashpot
and in parallel with another spring, resulting in three unknown parameters.
Knoop's early apparatus was commercialized in 1940 but a dashpot
was soon added to slow the indenter (5).
In curve B, which is a single dashpot
, stress and strain are related by the Newtonian equation:
are assigned at the exterior nodes of the base row.
Considering obtained yield data from performed compression tests at different strain rates, component-specific curves are driven to measure parameters of viscoplastic dashpots
Standard ZWT model is applied by combination usage of springs and dashpots
, representing elastic and viscous factors separately.
Because, in general, a very broad range of relaxation times is spanned by a relaxation process, an appropriately large number of springs and dashpots
, and therefore model parameters are required to accurately model properties over a wide time range.
The resistance of the spring elements is accounted for by the modulus (E) terms, and relaxation time ([tau]) accounts for the viscous response of the dashpots
This analogical model is made by the association of springs and dashpots
The Burgers model is a theoretical model that uses a combination of springs and dashpots
connected in a series and parallel arrangement to describe the viscoelastic macroscopic behavior of materials (23).
The Burgers model is a combination of the Maxwell (springs and dashpots
in series) and the Voigt (springs and dashpots
in parallel) models connected in series.