New Functionality in Version 4.3

  • Support for load cases:
  • Loads and constraints can act conditionally in models using load groups and constraint groups, which you can include in load cases using various combinations of the defined groups.
  • Use load groups for loads and other Neumann conditions. The loads can be scaled in the load cases using a scalar weight.
  • Use constraint groups for constraints and other Dirichlet conditions.
  • Available for the Solid Mechanics, Shell, Beam, Truss, and Plate interfaces.
  • A new Membrane interface for modeling, for example, prestressed membranes, cladding on solids, and inflatable flexible bags (balloons). The Membrane interface can be seen as a representation of plane stress in a 3D geometry or as a shell without bending stiffness.
  • New and redesigned periodic boundary conditions for solid mechanics and piezoelectric applications, including the following new types of periodic boundary conditions:
  • General Floquet periodicity conditions.
  • Cyclic symmetry condition for sector periodicity and dynamic cyclic symmetry.
  • Also, an option to prescribe the periodic conditions on the entire displacement vector has been added (it is the new default option).
  • Low-reflecting boundary condition, mainly intended for letting waves pass out from the model without reflection in time-dependent analysis. As a default, it takes material data from the domain in an attempt to create a perfect impedance match for both pressure waves and shear waves.
  • Rigid connector improvements:
  • Rigid connectors between shell edges are now available.
  • Rigid connectors from shell and solid interfaces can be attached to each other.
  • Linear buckling is now available for the Truss interface.
  • The Prestressed Analysis, Frequency Domain study type is now supported also by the Truss interface.
  • The rate of strain (Ld) and spin (Lw) tensors are now available as predefined variables (on the spatial frame) in the solid interfaces.
  • Strain energy density is now computed as a result also in the Truss, Beam, Shell, and Plate interfaces.
  • Shell curvature data is now available as variables, which you can use to modify material, thickness, or initial stress for deep drawn sheets.
  • Gauss point results are now available for almost all stress results in Structural Mechanics, and all Gauss point results have been moved to separate groups in the plot list.
  • The use of geometric nonlinearity is now controlled by a setting in the study step also for the Shell and Truss interfaces.

New Models

  • Sliding Wedge: This model is a friction benchmark.
  • Snap Hook Penalty: Model that shows an alternative simplified contact formulation.
  • Truss Tower Buckling: A linear buckling example using the Truss interface.
  • Vibrating Membrane: A verification example using the Membrane interface.
  • Nonlinear Magnetostriction
  • Turbine Stator

Backward Compatibility vs. 4.2a

  • The nonlinear structural mechanics functionality is version 4.2a is now available in the Nonlinear Structural Materials Module, which is an add-on to the Structural Mechanics Module. See Nonlinear Structural Materials Module. This applies to hyperelastic and elastoplastic materials, which are now available in the Nonlinear Structural Materials Module.
  • There is now a single redesigned Prescribed Rotation node for shells and plates that works with both linear and geometrically nonlinear material.

Backward Compatibility vs. Version 3.5a

Plane Stress

Version 4 represents the out-of-plane strain as a separate degree of freedom. Plane stress models made with version 3.5a need to be re-solved to correctly display strains and stresses. Displacements are correctly displayed.