What are viscoelastic behavior of materials?
Viscoelastic or viscoplastic behavior of a material shows itself in various ways, such as creep under constant load, time-dependent recovery of deformation followed by load removal, stress relaxation under constant deformation, and time-dependent creep rupture.
Is rubber a viscoelastic material?
Rubber is the most notable example of a polymer which exhibits viscoelastic properties. At a molecular level, rubber is formed of many polymer chains, the arrangement of which giving rise to its useful properties.
Why is rubber a viscoelastic material?
They are viscoelastic by virtue of their time-dependent mechanical response, which reflects the sluggish configurational changes of the molecules. Upon being crosslinked sufficiently, a chemical molecular network (rubber or elastomer) is formed that transforms the polymer into a viscoelastic solid, which does not flow.
What are viscoelastic behaviors of polymers?
One important characteristics of polymeric materials is their viscoelastic behavior. This means that polymer is elastic because after a strain due to the application of a stress, it is capable to recovers. On the other hand, polymers are viscous because their capability to creep after the strain.
What causes viscoelastic behavior?
Viscoelasticity is caused by temporary connections between fiber-like particles. Polymers always show a viscoelastic behavior because they consist of long molecules able to make temporary connections with their neighbors.
What is an example of a viscoelastic material?
Some examples of viscoelastic materials include amorphous polymers, semicrystalline polymers, biopolymers, metals at very high temperatures, and bitumen materials.
What is viscoelasticity example?
Some examples of viscoelastic materials include amorphous polymers, semicrystalline polymers, biopolymers, metals at very high temperatures, and bitumen materials. Cracking occurs when the strain is applied quickly and outside of the elastic limit.
What is viscous behavior?
Viscous flow is irreversible, once a body has been distorted stays that way, producing a permanent strain. All liquids show viscous behavior when strained, think when you squeeze toothpaste from a tube. During viscous behavior strain accumulates as a function of time, as shown in Figure 1.7.
What is viscoelastic effect?
In materials science and continuum mechanics, viscoelasticity is the property of materials that exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials, like water, resist shear flow and strain linearly with time when a stress is applied.
What is viscous behaviour?
What viscoelastic means?
Definition of viscoelastic : having appreciable and conjoint viscous and elastic properties such viscoelastic materials as asphalt also : constituting or relating to the state of viscoelastic materials viscoelastic data viscoelastic properties.
How is viscoelastic behavior measured?
In industries such as biomaterials, viscoelasticity is often measured by applying a sinusoidal force, calculating the resulting strain response and determining the elastic-spring-like storage modulus and the flow-like loss modulus. Such dynamic mechanical analysis can be performed as a bench test or deployed in-situ.