Viscoelastic Materials
Viscoelastic Materials consist of polymers of variable chain length and filters resulting in the following stress strain diagram.
Figure 12.1: Stress strain diagram for viscoeleastic material
Slope of the major axis of the ellipse is a measure of material stiffness while the ratio of the minor to major axis is a measure of damping.
Considering shear deformation of the viscoelastic materials the stress-strain relationship may be written as
where  =shear stress,  is the shear strain.  is the real part of the shear modulus (Storage Modulus) and  is the imaginary part of the shear modulus (Loss Modulus).
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