Viscoelasticity

How a material can behave partly like an elastic solid and partly like a viscous liquid, with the balance depending on how fast it's deformed.

References

• Williams, M.L., Landel, R.F., Ferry, J.D. "The Temperature Dependence of Relaxation Mechanisms in Amorphous Polymers and Other Glass-Forming Liquids." Journal of the American Chemical Society 77, no. 14 (1955): 3701–3707.