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Stress and strain rheometry

In a strain rheometer, shear is generated between a moving and a fixed solid surface, typically under rotary motion. When a fluid is placed between these surfaces a drag flow is created and the shear deformation in the fluid can be used to estimate its rheological properties.

Strain rheometry capabilities in the Arkema Analytical Solutions laboratory include:

  • Conventional geometries as well as fixtures for solids, melts and curable resins
  • Extensional viscosity measurement
  • Dynamic mechanical analysis (DMA)
  • Double wall Couette for very low viscosity samples
  • High viscosity fluids and solids testing in steady rotational and dynamic modes
  • Falling needle viscometer, ideal for solutions containing low boiling point components

In a stress rheometer the shear between two moving surfaces, traditionally under rotary motion, is achieved by controlling the applied torque and measuring the angular motion of the rotating shaft. Controlled stress rheometers are often used to study rheology of ordered systems (often suspensions), that is, to measure yield stresses and critical stresses associated with structure breakdown and recovery processes in these systems.

Stress rheometry capabilities in the Arkema Analytical Solutions laboratory include:

  • Measurement of steady and dynamic shear properties and gelation
  • Parallel plate, cone and plate, and Couette geometries
  • Peltier system for rapid temperature ramping
  • High pressure cell