15 lines
696 B
Markdown
15 lines
696 B
Markdown
Viscous materials, like water, resist both shear flow and strain linearly with
|
||
time when a stress is applied. Elastic materials strain when stretched and
|
||
immediately return to their original state once the stress is removed.
|
||
|
||
A viscoelastic material has the following properties:
|
||
|
||
[Hysteresis](Hysteresis.md) is seen in the stress–strain curve
|
||
stress relaxation occurs: step constant strain causes decreasing stress
|
||
creep occurs: step constant stress causes increasing strain
|
||
its stiffness depends on the strain rate
|
||
|
||
A viscoelastic substance dissipates energy when a load is applied, then removed.
|
||
|
||
### nota bene
|
||
The properties of a viscoelastic layer change with the frequency of excitation |