What is linear viscoelastic material?
Linear viscoelastic materials are those for which there is a linear relationship between stress and strain (at any given time). Linear viscoelasticity is a reasonable approximation to the time-dependent behaviour of polymers, and metals and ceramics at relatively low temperatures and under relatively low stress.
What is viscoelastic material used for?
Viscoelastic materials are used in automobile bumpers, on computer drives to protect from mechanical shock, in helmets (the foam padding inside), in wrestling mats, etc. Viscoelastic materials are also used in shoe insoles to reduce impact transmitted to a person’s skeleton.
What is anelastic and viscoelastic properties of materials?
Viscoelastic materials have properties that depend on strain rate. Anelastic solids represent a subset of viscoelastic materials: they have a unique equilibrium configuration and ultimately recover fully after removal of a transient load.
What is elasticity material?
In the science of physics, elasticity is the ability of a deformable body (e.g., steel, aluminum, rubber, wood, crystals, etc.) to resist a distorting effect and to return to its original size and shape when that influence or force is removed. Solid bodies will deform when satisfying forces are applied to them.
What is viscoelasticity in rubber?
In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Elastic materials strain when stretched and immediately return to their original state once the stress is removed.
Which is the best description of linear viscoelasticity?
Linear viscoelasticity is a theory describing the behaviour of such ideal materials. Strain-time curves for various constant stresses are shown in the following figure for a linear viscoelastic material.
How are viscoelastic materials different from purely elastic materials?
Because viscoelastic materials have the viscosity factor, they have a strain rate dependent on time. Purely elastic materials do not dissipate energy (heat) when a load is applied, then removed; however, a viscoelastic substance does.
How are viscoelastic materials related to time dependent strain?
Viscous materials, like water, resist 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. Viscoelastic materials have elements of both of these properties and, as such, exhibit time-dependent strain.
Why are polymers and biological materials have viscoelastic behavior?
Both polymers and biological materials have viscoelastic behavior. Figure 1. In the Fort Point Channel Tunnel in Boston, 12 tons of concrete fell on a car due to creep in the epoxy that was used to support anchoring bolts for the ceiling panels. Why is it important to understand viscoelasticity?