Module 3: Dynamic Properties and Selection of Materials
Lecture 12: Linear Viscoelastic Model
Stress-strain relationship
The generalised stress-strain relationship in a polymer could be written as
(12.2)
where is the stress and is the strain. In this relationship, if all the coefficients
and are constants, the material is referred to as linear viscoelastic. The reason the material is called thus is that we can, combining linear
springs (elastic) and dashpots (viscous), arrive at the stress-strain relationship with constant coefficients.
is the stress and 
is the strain. In this relationship, if all the coefficients
and 
are constants, the material is referred to as 
