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Dynamic shear rheometer
Viscosity curve of epoxy-based sealer at 80 °C showing the shear thinning of the molten epoxy resin.
Using a dynamic rheometer.
Frequency: from 100 to 10 Hz (log variation).
Plate/plate geometry - gap: 700 µm.
Deformation: 0.01 %.
The complex viscosity µ* (oscillation measurement) is comparable to the viscosity µ (rotation measurement).
The velocity gradient is proportional to the frequency.
Uses
Research and development as well as for quality control
A dynamic shear rheometer, commonly known as DSR, is used for research and development as well as for quality control in the manufacture of a wide range of materials. Dynamic shear rheometers have been used since 1993 when Superpave was used for characterising and understanding high temperature rheological properties of asphalt binders in both the molten and solid state and is fundamental in order formulate the chemistry and predict the end-use performance of these materials.
This is done by deriving the complex modulus (G*) from the storage modulus (elastic response, G') and loss modulus (viscous behaviour, G") yielding G* as a function of stress over strain. It is used to characterize the viscoelastic behavior of asphalt binders at intermediate temperatures from 10° to 150 °C (50° to 302 °F).
and 26 Related for: Dynamic shear rheometer information
types of rheometers. Rheometers that control the applied shear stress or shear strain are called rotational or shearrheometers, whereas rheometers that apply...
A dynamicshearrheometer, commonly known as DSR, is used for research and development as well as for quality control in the manufacture of a wide range...
be measured with various rheometers that apply extensional stress. Volume viscosity can be measured with an acoustic rheometer. Apparent viscosity is a...
An acoustic rheometer is a device used to measure the rheological properties of fluids, such as viscosity and elasticity, by utilizing sound waves. It...
and shear is applied. These particles create hydroclusters which exert a drag force resisting flow. Continuum mechanics Dynamicshearrheometer Electrorheological...
Look up DSR in Wiktionary, the free dictionary. DSR may refer to: Dynamicshearrheometer, used for research and development as well as for quality control...
rate, stress, or in an oscillatory fashion (a form of dynamic mechanical analysis). Shearrheometers are typically limited by edge effects where the material...
{\displaystyle \tau } is the shear stress ("skin drag") in the fluid, μ {\displaystyle \mu } is a scalar constant of proportionality, the dynamic viscosity of the...
which vary with flow conditions, an instrument called a rheometer is used. Thus, a rheometer can be considered as a special type of viscometer. Viscometers...
{\displaystyle v={\frac {\mu }{\rho }}} , [m2 s−1] ρ – fluid density, [kg m−3]. Rheometers are instruments used to characterize the rheological properties of materials...
Timoshenko improved the theory further by incorporating the effect of shear on the dynamic response of bending beams. This allowed the theory to be used for...
under shear. If placed in a typical coaxial viscometer, the resulting flow pattern a distorted shear flow or plug flow. For accurate data, rheometers typically...
particles are flowing along straight and parallel pathlines, if there is shear (that is, if the flow speed varies across streamlines). For example, in...
that does not support shear stress; that is why a fluid at rest has the shape of its containing vessel. A fluid at rest has no shear stress. The assumptions...
for the low range shear stress rates, and the high rates were measured using a capillary rheometer, a device used to measure shear stress rates under...
frictional shear stresses in the contact interface. In this case, if the tangential force is reduced then the elastic deformations and shear stresses reduce...
fluids are also known to be subject to shear thinning, whereby the viscosity above yield decreases with increased shear rate. Furthermore, the behavior of...
plastics. A solid is a material that can support a substantial amount of shearing force over a given time scale during a natural or industrial process or...
such as viscous forces, are represented by Fsurf, the net force due to shear forces acting on the volume surface. The momentum balance can also be written...
Winter, H. H. (1981). Lubricated Squeezing Flow: A New Biaxial Extensional Rheometer. Journal of Rheology, 25(4), 433–443. Nijenhuis, K. T., & Winter, H. H...
microencapsulation of active substances, and Rheocontrol, which markets new rheometers. In 1998, he was appointed Deputy Scientific Director of Rhône-Poulenc...
oscillating drop method or shear surface rheometers such as double-cone, double-ring or magnetic rod shear surface rheometer. Surfactants play an important...
strain/stress curve, meaning its viscosity is independent of time, shear rate, or shear-rate history. Examples of Newtonian liquids include water, glycerin...
stress) and frictional stresses acting tangentially between the surfaces (shear stress). Normal contact mechanics or frictionless contact mechanics focuses...
(classical plate theory) The Uflyand-Mindlin theory of plates (first-order shear plate theory) The Kirchhoff–Love theory is an extension of Euler–Bernoulli...
involving liquids Hydrostatic stress – Component of mechanical stress without shear Internal pressure – measure of how the internal energy of a system changes...
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