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Silly Putty's unusual flow characteristics are due to the ingredient polydimethylsiloxane (PDMS), a viscoelastic substance. Viscoelasticity is a type of non-Newtonian flow , characterizing a material that acts as a viscous liquid over a long time period but as an elastic solid over a short time period. [ 7 ]
Comparison of non-Newtonian, Newtonian, and viscoelastic properties Viscoelastic: Kelvin material, Maxwell material "Parallel" linear combination of elastic and viscous effects [11] Some lubricants, whipped cream, Silly Putty: Time-dependent viscosity: Rheopectic: Apparent viscosity increases with duration of stress Synovial fluid, printer ink ...
The material responds to the stress with a strain that increases until the material ultimately fails, if it is a viscoelastic liquid. If, on the other hand, it is a viscoelastic solid, it may or may not fail depending on the applied stress versus the material's ultimate resistance.
Silly Putty is a toy most anyone can appreciate. This experiment lets you turn two common goods (cornstarch and dish soap) into endless hours of non-Newtonian fun. You might need to tweak the ...
Many people are indirectly familiar with PDMS because it is an important component in Silly Putty, to which PDMS imparts its characteristic viscoelastic properties. [46] Another toy PDMS is used in is Kinetic Sand. The rubbery, vinegary-smelling silicone caulks, adhesives, and aquarium sealants are also well-known.
A Newtonian fluid is a power-law fluid with a behaviour index of 1, where the shear stress is directly proportional to the shear rate: = These fluids have a constant viscosity, μ, across all shear rates and include many of the most common fluids, such as water, most aqueous solutions, oils, corn syrup, glycerine, air and other gases.
Immediately after the pressure is alleviated, the fluid recoils backward in the tube and forms a more blunt flow profile. When Silly Putty is rapidly stretched and held at an elongated position for a short period of time, it springs back. However, if it is held at an elongated position for a longer period of time, there is very little recovery ...
Non-Newtonian fluids like Silly Putty appear to behave similar to a solid when a sudden force is applied. [3] Substances with a very high viscosity such as pitch appear to behave like a solid (see pitch drop experiment) as well. In particle physics, the concept is extended to include fluidic matters other than liquids or gases. [4]