OptiStruct to ANSYS Conversion Mapping

Conversion Notes

  1. If CBEAM is associated with PBEAM/PBEAML, then the properties within those cards will be converted to ANSYS SECTION with type BEAM. OptiStruct beam cross sections of types: BAR, CHAN, HAT, I, L, T, ROD, and TUBE are converted to ANSYS equivalent beam sections.

    OptiStruct Z and BOX sections are converted to ANSYS ASEC beam sections. CHAN, Z, and BOX sections are only converted when PBEAML has a HyperBeam section attached. PBEAM is converted to ANSYS ASEC when HyperBeam sections are not attached to a property card. OptiStruct NSM is converted to ANSYS ADDMAS.

    Limitation: In the current version of the conversion tool, section offsets are not considered.

  2. PSHELL and PSHEAR properties are converted to ANSYS SECTIONS with type SHELL. Shell thickness and material from PSHELL/PSHEAR are mapped to TK and Material of SHELL section. After conversion, section offset is always set to MID.
  3. Conversion of contact surfaces: If contact surfaces in OptiStruct are defined with node sets, then the surfaces will not be converted.

Materials

Table 1. Supported Material Mappings
OptiStruct ANSYS Convert Parameters
MAT1 MPTEMP/MPDATA E, G, NU, RHO, A, GE, TREF
MATT1 MPTEMP/MPDATA T(E), T(G), T(NU), T(RHO), T(A), T(GE)
MAT2 MATERIAL density
MAT4 MATERIAL density

Elements

Table 2. Supported Element Mappings
OptiStruct ANSYS HM Configuration
CONM2 MASS21 Mass
CELAS1 COMBI14 Spring
CBEAM BEAM188 Bar2
CBAR BEAM44 Bar2
CROD LINK8 Rod
CTRIA3, CTRIAR SHELL181 Tria3
CQUAD4, CQUADR, CSHEAR SHELL181 Quad4
CTRIA6 SHELL281 Tria6
CQUAD8 SHELL281 Quad8
CTETRA SOLID45 Tetra4
CTETRA SOLID95 Tetra10
CHEXA SOLID45 Hex8
CHEXA SOLID95 Hex20
CPENTA SOLID45 Penta6
CPENTA SOLID95 Penta15
CGAP CONTACT52 Gap
CBUSH COMBI14 Spring

Properties

Table 3. Supported Property Mappings
OptiStruct ANSYS Convert Parameters
PBEAM, PBEAML SECTION See Note 1.
PBAR, PBARL BEAM44p None. Only creates a property card.
PBUSH COMBI14p k1 to k6, GE1 to GE6
PELAS COMBI14p k, GE
PGAP CONTACT52p U0, KA, KT, MU1
PROD LINK8p None
PSHELL, PSHEAR (tria3, quad4) SECTION See Note 2.
PSHELL, PSHEAR (tria6, quad8) SECTION See Note 2.
PSOLID (tetra4, penta6, hex8) SOLID45p None
PSOLID (tetra10, penta15, hex20) SOLID95p None

ETType of ANSYS

If the model contains OptiStruct elements which were mapped to MASS21, LINK8, COMBI14, BEAM44, SHELL181, SHELL281, SOLID45 and SOLID95 elements, respective ETTYPES will be created and assigned to the component. Key options of ETTYPE are not updated.

Components

If the component collector contains different type of configuration of elements, new components will be created for the respective configurations and those elements will be moved into the new component. ETTYPE, material, and realset section IDs will be assigned to the new component.

Loads and Boundary Conditions

Loads and boundary conditions will not be converted by using this conversion tool.

Contact Surfaces

Conversion of contact surfaces: If in OptiStruct a contact pair's master and slave are both contact surfaces (CSURF), then the contact surfaces and the pair will be retained after conversion. However, in ANSYS, you must add the details for the surfaces, such as Et type and property card. If the friction coefficient MU1, available in the OptiStruct property card, is attached to the contact pair, then a new material card with a MPDATA card image will be created, and the value will be mapped to MU in the ANSYS format after conversion.