Rheological measurements in rotation (Parts 1-3) reflect the flow characteristics during the production process (e.g., agitation, pumping, pipe flows) as well as storage, transport, and applications (such as painting spraying or spreading). Part 4 focuses on measurements in oscillation mode. Rheological measurements in oscillation are used to characterize material and processing characteristics, storage stability, relaxation properties, softening, melting, gelatinization, networking, and hardening.

During this 4-part series we explain fundamental rheological concepts, introduce standard measurements to investigate flow and deformation behavior of various samples and connect rheological results to actual applications. 

Philipp Beutler

Part 1: Theoretical background and measurement of the dynamic shear viscosity

  • Definitions of basis rheological terms and parameters
  • Factors affecting viscosity including temperature, shear rate, and pressure

Run time: 24 minutes

Fabian Meyer

Part 3: Viscoelasticity and creep recovery tests

  • General consideration on viscoelastic behavior

Run time: 23 minutes

Klaus Oldorp

Part 2: Yield stress and the time-dependent flow behavior
 

  • Methods for determining yield stress
  • Time-dependent flow behavior like thixotropy and rheopexy

Run time: 23 minutes

Philipp Beutler

Part 4: Viscoelasticity and oscillatory tests

  • Rheology in oscillatory shear mode: theory and parameters such as phase angle and complex modulus
  • Oscillatory test methods and practical examples including amplitude, frequency, time and temperature sweeps

Run time: 17 minutes

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