Viscoelasticity is of interest in materials science, metallurgy, and solid state physics since it is causally linked to a variety of microphysical processes and can be used as an experimental probe of those processes. In applications, one may deliberately make use of the viscoelasticity of certain materials in the design process, to achieve a particular goal. These are obtained, if the strain is recorded for a constant effective stress after time periods t v t2, ty>. Materials used in engineering applications may exhibit viscoelastic behavior as an unintentional side effect. ELASTICITY, VISCOSITY A N D PLASTICITY 5.1 Introduction The stress-strain-time (constitutive) behaviour of a real geomaterial may be represented qualitatively by the diagrams in Fig. When used in this equation, the viscosity is often referred to as dynamic viscosity or absolute. Kinematic viscosity is measured in units of (length) 2 /time most commonly using centiStokes (cSt), where 1 Stoke 1 cm 2 /s. where v kinematic viscosity, dynamic viscosity, p density. For example, viscoelastic shoe insoles are useful in reducing mechanical shocks transmitted to the bones and joints. The kinematic viscosity equation is: v/p. Materials used for structural applications of practical interest may exhibit viscoelastic behavior which has a profound influence on the performance of that material. Substances that display a high degree of elasticity are termed 'elastic.' The SI unit applied to elasticity is the pascal (Pa), which is used to measure the modulus of deformation and elastic limit. These were more pronounced in some materials such a food dough, wet clays, pitch and unvulcanized rubbers. Such effects, which were not accounted for the classical theories were called elastic after-effects. Do this until you have added 25 pennies and record. Elasticity is a physical property of a material whereby the material returns to its original shape after having been stretched out or altered by force. viscosity and elasticity were dependent on pre-treatments and loading history. Measure the distance the rubber band stretches with each addition and calculate the strain for each case. Start adding pennies, five at a time, to the container. Viscosity is a form of internal friction and as such during flow results in energy. Use a paperclip or tape to hang a plastic cup or baggie or other container to the rubber band. Since the applied force and the restoring force are equal in. Viscosity affects how quickly liquids flow in a given circumstance. The study of viscoelastic behavior in bone and in bio-protective materials is of interest in several contexts. The stress is defined as the restoring force acting on a unit area.
0 kommentar(er)
