Rheology Analysis & Viscoelasticity, Viscosity Testing & Research
Rheology Analysis and Viscoelasticity Profiling
Our two advanced research rheometers (AR2000EX and AR1000N) provide high quality flow, creep and oscillation testing capabilities in controlled stress and controlled strain/rate modes of operation. These versatile instruments can test samples ranging from very thin to very thick liquids and ultra-fragile colloidal structures to highly-rigid solids.
The following rheological testing procedures are available:
- Shear stress and shear rate sweeps in either continuous, stepped-ramp or steady-state (equilibrium) mode.
- Viscosity / temperature ramps
- Thixotropy testing: Either up-down ramps or three-step methods (conditioning–breakdown-recovery). Three step methods can be performed in shear, oscillation or mixed formats.
- Oscillation stress or strain amplitude sweeps
- Oscillation frequency sweeps
- Oscillation temperature ramps (continuous) or sweeps (stepped). Temperature cycling can also be performed.
- Creep/Relaxation test.
Examples of some of these methods can be found here.
These rheological methods will deliver the following material properties:
- Viscosity as a function of shear stress, shear rate and temperature.
- Zero-shear viscosity measurement.
- Infinite shear viscosity.
- Yield stress and yield/critical strain.
- Rate of thixotropic breakdown on shearing and recovery following the cessation of shearing.
- Viscoelasticity profiling through oscillatory (dynamic) and creep testing modes
- Determination of complex, elastic (storage) and viscous (loss) moduli, complex viscosity, phase angle (δ) and loss tangent (tanδ).
- Normal stress and 1st Normal stress coefficient measurement.