New Features in MCalibration 6.6.0

New Features

  • Improved how stress-strain predictions are stored in the mcal-file. The data is now stored in a more space efficient manner.
  • Added a new load case type called “Graph Data”. This load case type can be used to just plot experimental data.
  • Added one more pre-defined virtual load case type: 10 tensile load cycles with increasing strain amplitude.
  • Added support for the BAM hyperelastic material model in the PolyUMod PN model. This new model is EType=28.
  • Added an internal solver for the Abaqus PRF model with 2 Yeoh hyperelastic networks, Bergstrom-Boyce flow, and isotropic hardening plasticity. This model is called “Abaqus-PRF2YB-Plast” in MCalibration.
  • Added an internal solver for the Abaqus PRF model with 3 Yeoh hyperelastic networks, Power flow, and isotropic hardening plasticity. This model is called “Abaqus-PRF3YP-Plast” in MCalibration.
  • Added internal solver support for Abaqus linear elastic with creep.
  • Added internal solver support for Abaqus linear elastic with isotropic hardening plasticity and creep.
  • Added one more predefined file size to the image export dialog.
  • Added a fitness weight factor for load cases that do not finish.
  • The virtual load case dialog now includes an experimental data library. It currently contains experimental data for: PET, ABS, and natural rubber.
  • MCalibration now takes a field variable (which can be useful for analyzing material models that depend on, for example, humidity or moisture).
  • The internal solver can now calibrate both WLF and Arrhenius time-temperature-superpositioning parameters for all relevant Abaqus material models.

 

Software Improvements

  • Improved the GUI interface for the Abaqus elastic-plastic material model with isotropic hardening.
  • Can now specify that the number of pairs of stress-strain data should be determined from the experimental data.
  • Simplified how the stress and strain types are specified for a load case.
    Switched to Qt 6.2.3 for the GUI toolkit.
  • Improved how the MCalibration solver works with creep load cases.
  • Removed support for the M8 material model.
  • Improved the stability when reading in a mcal-file with issues.
  • Improved the stability of the internal solver for the Abaqus Johnson-Cook plasticity model.
  • Improved the Ansys elastic plastic with creep model.
  • Removed “+” from exported LS-DYNA k-files.
  • Load cases that use an Abaqus solver are now analyzed in separate subdirectories during calculations.
  • In most cases MCalibration now automatically uses hybrid elements when needed.
  • Cleaned up the material model selection dialog.

 

Bug Fixes

  • Fixed a bug in the Add Segment for a Virtual Load case dialog.
  • Fixed a bug for large strain shear in compression.
  • Fixed a bug in the save all calibration improvements to the model history function.
  • Fixed a bug in the Ansys MISO Creep model.
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How to Force Drucker’s Stability in MCalibration

A material model is considered Drucker’s stable if an increase in strain results in an increase in stress. In some cases it can be important to enforce that a material model is Drucker’s stable. This article shows how you can easily achieve this in MCalibration.

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