CHAPTER 3: VISCOELASTICITY

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CHAPTER 3 VISCOELASTICITY
When subjected to a step constant stress,
viscoelastic materials experience a
time-dependent increase in strain. This
phenomenon is known as viscoelastic creep. At a
time , a viscoelastic material is loaded with a
constant stress that is maintained for a
sufficiently long time period. The material
responds to the stress with a strain that
increases until the material ultimately fails, if
it is a viscoelastic liquid. If, on the other
hand, it is a viscoelastic solid, it may or may
not fail depending on the applied stress versus
the material's ultimate resistance. When the
stress is maintained for a shorter time period,
the material undergoes an initial strain until a
time , after which the strain immediately
decreases (discontinuity) then gradually
decreases at times tgtt1 to a residual strain.
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