The main features of RheoChart are listed below. The best way to explore these features and to discover others is obviously to download the free trial.

Please note that not all the features listed below are implemented in the current version. These missing features will be added progressively. Please also note that the list is still not completed and/or finalised.

Not finding a feature? Would you like to see one of your preferred model implemented in RheoChart? Or you find that a material function would help you to better calibrate the parameters of your model? Don't hesitate to so that we can discuss what is feasible.

Rheological Modelling

Generalised Newtonian models
  • Newtonian (constant)
  • Power law
  • Bird-Carreau-Yasuda
  • Cross
  • Bingham
  • Herschel-Bulkley
  • Log-Log
Multi-mode differential viscoelastic models
  • Double Convected Pom-Pom (DCPP)
  • Giesekus
  • Phan Thien-Tanner (PTT)
  • Upper-Convected Maxwell (UCM)
  • Oldroyd-B (using a combination of a UCM and a Newtonian modes)
  • FENE-P
  • White-Metzner
Temperature dependence
  • No dependence
  • Williams-Landel-Ferry (WLF)
  • WLF shear stress
  • Arrhenius
  • Arrhenius shear stress
  • Arrhenius Approximate
  • Arrhenius Approximate shear stress
  • Fulcher

Material Functions

Linear Properties
  • Shear Storage Modulus
  • Shear Loss Modulus
Steady Shear Flow
  • Steady Shear Viscosity
  • First Normal Stress Coefficient
  • Second Normal Stress Coefficient
Transient Shear Flow
  • Shear Stress Growth coefficient
  • First Normal Stress Growth coefficient
  • Second Normal Stress Growth coefficient
  • Large Amplitude Oscillatory Shear stress (LAOS)
  • Multi-Ramp Shear stress: arbitrary multi-ramp function of the shear rate
  • Multi-Ramp Shear rate: arbitrary multi-ramp function of the shear stress
  • Shear stress decay function (see note below)
  • Shear stress relaxation function (see note below)
  • Shear rate in a creep experiment (see note below)
Transient Extensional Flow
  • Tensile Stress Growth coefficient
  • Biaxial Stress Growth coefficient
  • Planar Stress Growth coefficient
Other outputs
For all the material functions listed above, it is also possible to visualise all the stress components for that flow. For the multi-ramp shear stress rate function, the shear strain can also be visualised.
Note: some properties (such as the shear stress decay function, shear stress relaxation function, shear rate in a creep experiment,...) are obtained using the more versatile "Multi-Ramp" properties.

Automatic Fitting - Parameters Calibration

RheoChart has the unique capability to fit model predictions against experimental data. This procedure sometimes referred as parameters calibration can be very tedious to accomplish manually. RheoChart can greatly simplify this procedure.

All parameters of a model (Generalised Newtonian models or Multi-mode differential viscoelastic models) can be estimated using several optimisation algorithm. These parameters can be bound by upper and/or lower-limits or left to vary freely. Alternatively, parameters can be fixed.

Every material functions available in RheoChart can be used to curve fit experimental data. A fitting procedure can use one or more experimental curves simultaneously. A weight can be associated with each experimental curve.

Graphical Interface

Project
  • Multiple models can be defined in a project
  • Multiple Fittings can be defined for each models
  • Copy/Paste/Renaming models, modes, property and fittings
  • Disable/Enable confirmation when deleting a model, mode, property, fitting or curve
  • Add multiple mode at once
Dynamic Charts
  • Zoom/Unzoom using the mouse
  • Switch between linear and logarithm scales
  • Tabbed charts (several charts can be created simultaneously)
  • Charts can be saved as images or copied to the clipboard
  • Model curve can optionally show markers
Curves
  • Model predictions can be exported in CSV files
  • Experimental curves can be imported in CSV format
  • Experimental points can be edited/deleted