Since the energy put into the material (loading curve) is more than that 'returned' by the material, then we have to conclude that there is energy lost!
What is Viscoelasticity?
What is Relaxation?
What is Creep?
The Maxwell Model
Kelvin–Voigt model
Engineering Viscoelasticity (PDF)
Basic Elasticity and Viscoelasticity
Viscoelastics Behavior of rubbery materials
A brief review of Elasticity and Viscoelasticity
Visco-Code 01 - Maxwell.m
Visco-Code 02 - Kelvin.m
Visco-Code 03 - Zener.m
Single Degree of Freedom
Multiple Degrees of Freedom
Vibration Absorber
Periodic Structures
ViscoElastic Damping
Piezoelectricity
MR Fluids