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Encyclopedia > Viscoelastic

A viscoelastic material is one in which:

• hysteresis is seen in the stress-strain curve.
• stress relaxation occurs: step constant strain causes decreasing stress
• creep occurs: step constant stress causes increasing strain

Viscoelastic material models are frequently used to describe the behaviour of (soft) human tissue, plastics, soil, etc. Commonly used viscoelastic models are the Kelvin material and Maxwell material. Each model can be represented by springs and dash-pots set in combinations of series and parallel elements. Hysteresis is a property of systems (usually physical systems) that do not instantly follow the forces applied to them, but react slowly, or do not return completely to their original state: that is, systems whose states depend on their immediate history. ... Stress has different meanings in different fields: Stress (physics); see also tensile stress, shear stress and pressure. ... Strain, in any branch of science dealing with materials and their behaviour, is the geometrical expression of deformation caused by the action of stress on a physical body. ... The term plastics covers a range of synthetic or semi-synthetic polymerization products. ... For the heavy metal band see Soil (band) Soil is the layer of minerals and organic matter, in thickness from centimetres to a metre or more, on the land surface. ... A Maxwell material is a viscoelastic material having the properties both of elasticity and viscosity. ... The word spring has several meanings: spring (device), a common mechanical part. ...

Linear viscoelasticity is when the function is separable in both creep response and load. All linear viscoelastic models can be represented by a Volterra equation connecting stress and strain. Like: In mathematics, an integral equation is an equation in which an unknown function appears under an integral sign. ... Stress has different meanings in different fields: Stress (physics); see also tensile stress, shear stress and pressure. ... Strain, in any branch of science dealing with materials and their behaviour, is the geometrical expression of deformation caused by the action of stress on a physical body. ...

or

where t - time, σ(t) - stress, ε(t) -strain, Einst,creep and Einst,relax - instantaneous elastic moduluses for creep and relaxation, K(t) - creep function, F(t)- relaxation function. 8:17 am, August 6, 1945, Japanese time. ... Stress has different meanings in different fields: Stress (physics); see also tensile stress, shear stress and pressure. ... Strain, in any branch of science dealing with materials and their behaviour, is the geometrical expression of deformation caused by the action of stress on a physical body. ... In solid mechanics, Youngs modulus (also known as the modulus of elasticity or elastic modulus) is a measure of the Stiffness of a given material. ... The term creep has several meanings: A derogatory slang term describing a type of person; e. ...

Linear viscoelasticity usually applicable only for small deformations Deformation is a change in shape due to an applied force. ...

Nonlinear viscoelasticity is when the function is not separable. It is usually happens when the deformations are large or if the material changes its properties under deformations Deformation is a change in shape due to an applied force. ...

Results from FactBites:

 Viscoelasticity - Wikipedia, the free encyclopedia (314 words) Viscoelastic material models are frequently used to describe the behaviour of (soft) human tissue, plastics, soil, etc. Commonly used viscoelastic models are the Kelvin material and Maxwell material. Scientists defined this material as viscoelastic because it exhibited the characteristics of a viscous liquid and an elastomeric solid. Linear viscoelasticity is when the function is separable in both creep response and load.
 Viscoelasticity - definition of Viscoelasticity in Encyclopedia (79 words) A viscoelastic material is one in which the stress induced is proportional to the rate of strain in the material. Viscoelastic material models are frequently used to describe the behaviour of human tissue. Commonly used viscoelastic models are the Kelvin-Voight and Maxwell models.
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