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April 2026

The release notes for the upcoming release are:

New features

  • Elements

  • Initial conditions:

  • Loads:

    • Renamed all springs to spring-ground-*
    • Added springs acting in global x-, y-, z-directions for beam elements and 3D elements

  • Constitutive models

  • Contact models

    • Mohr-Coulomb: The Mohr-Coulomb friction model extends the already available Coulomb friction model by incorporating dilatancy through a non-associated flow rule. With the introduction of the Mohr-Coulomb model, a renaming was intrduced: the so far used keyword MC is now deprecated, new keywords are now Coulomb and Mohr-Coulomb for the fricitonal contact. For more information see the Reference Manual

  • Anderson acceleration: Anderson acceleration is a general technique for accelerating the convergence of fixed-point iterations (i.e. when the global Jacobian used in the Newton-Raphson iteration is not updated at every iteration or changes only mildly - for instance when an elastic tangent is used in place of the consistent elasto-plastic tangent). For more information please refer to the Refernce and the Theory manuals.

  • Strength reduction:

General modifications

  • Performance

    • Performance of the PARDISO solver was noticeably improved, reducing solve time by up to a factor of 3.

  • Constitutive models

    • Barotropic elasticity was modified such that for void ratios smaller than \(e<10^{-3}\) the pyknotropy feature is deactivated
    • Mohr-Coulomb-2 now expects the friction and dilatation angle to be given in degree
    • Mohr-Coulomb-2 now support random fields for friction angle, dilatation angle and cohesion.

  • Output

    • Stress and Strain output are now requested via stress and strain, respectively. The old keywords S and E are deprecated (backward compatibility is maintained).
    • More detailed information for cutback reasons during automatic time stepping reported in statistic (.sta) and message (.msg) files

  • Accelerator: New keyword *Accelerator which gives a unified interface so methods desinged to improve convergence of the iterative solution process (implicit simulations). The new keyword replaces the old *Line search, however, backward compatibility is maintained. See the Refernce and the Theory manuals for more information.

Resolved bugs

  • Resolved bug for *Equations where the coupling terms between two constrained degrees of freedom are inactive in the model

  • Resolved bug for hypoplastic/Sanisand contact models.

  • Linux versions: import of random fields from csv-files fixed

Manuals

  1. P.-A. Wolffersdorff. A hypoplastic relation for granular materials with a predefined limit state surface. Mechanics of Cohesive-frictional Materials, 1(3):251–271, 1996. doi:10.1002/(SICI)1099-1484(199607)1:3<251::AID-CFM13>3.0.CO;2-3. ↩

  2. Merita Tafili, Jose Duque, David Mašín, and Torsten Wichtmann. A hypoplastic model for pre-and post-liquefaction analysis of sands. Computers and Geotechnics, 171:106314, 2024. ↩