Voigt model of viscoelasticity

The Kelvin — Voigt Model. A similar development can be followed for the case of a spring and dashpot in parallel, as shown schematically in Figure 5.61a. In this model, referred to as the Kelvin-Voigt model of viscoelasticity, the stresses are additive... 

According to the Kelvin (Voigt) model of viscoelasticity, what is the viscosity (in Pa-s) of a material that exhibits a shear stress of 9.32 x 10 Pa at a shear strain of 0.5 cm/cm over a duration of 100 seconds The shear modulus of this material is 5 x 10 Pa. 

Note that this definition does not subtract the instantaneous or elastic strain to obtain creep. This is due to the difficulty in separating the two components of the time-dependent strain required by the Kelvin or Voigt model of viscoelasticity. 

In addition to the strength of adhesives under impact, also the properties related to dynamic deformabdity are of interest. Sato and Ikegami (2000) have studied the cases of lap joints and scarf joints subjected to axial impact loads. Preliminarily, they have measured the attenuation of the axial-strain waves in a special specimen of epoxy adhesive, manulactured (by molding the adhesive resin) as a cylinder of length 900 mm and diameter 20 mm. From these results the complex compliance of the material was obtained and, in turn, used to identify the parameters of a five-element Voigt model of viscoelasticity. These material data have been introduced in the finite element simulation of the impact tests on the joints. The joints used in... 

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