RADIOSS Block Format

The RADIOSS translator is invoked identically to all other formats read into PRIMER. Please refer to MODEL > READ of the main manual for details on the READ function, remembering to select the RADIOSS sub-type.

For a translation the starter file must be present. An engine file can optionally be selected. The generic file extension for a starter file is 00 (Radioss starter files usually end with d00 or D00), but this can easily be modified in the file selector panel. Once the correct file has been selected and the APPLY button pushed, another window will be created which allows an engine file to be selected and some options to be set.

The buttons in the Radioss Translation Defaults box are as follows:

APPLY accept the defaults in the panel and proceed with the translation.

DISMISS terminate the translation process, returning to the generic READ panel.

HELP will create a message box full of useful information about the function of this panel.

READ ENGINE FILE button can be checked to select an engine file by either typing in the name in the text box or by pressing the button which will bring up the file selection box. Engine files by default have the extension 01 (Radioss engine files usually end with d01 or D01). The engine file is translated by default as long as a *01 file exists that corresponds to the *00 starter file.

CONVERT _GENERAL sets to _LIST can be used to convert sets that use the _GENERAL option to _LIST sets.

Translate ADMAS to? can be used to specify the method of translation for /ADMAS cards.

All types except SURF and NODENS are supported.
NODE is translated to a *SET_NODE.
GENE is translated to *SET_NODE_GENERATE.
PART is translated to a *SET_NODE_GENERAL using option PART.
BOX and BOX2 are translated to a *SET_NODE_GENERAL using option BOX (box is created).
SUBSET, MAT and PROP are translated to a *SET_NODE_GENERAL using option PART (an equivalent list of parts is generated).

TYPE2: Converted to *CONTACT_TIED_SHELL_EDGE_TO_SURFACE_OFFSET. This is used instead of *CONTACT_TIED_NODES_TO_SURFACE as it is better for tying spotweld beams onto shells (the rotational dof is handled correctly with tied shell edge, with tied nodes to surface it is not). The _OFFSET option is used so that the contact will work correctly if any nodes on the contact segments are in constraints (e.g. nodal rigid bodies

TYPE 3: Converted to *CONTACT_AUTOMATIC_SURFACE_TO_SURFACE

TYPE5: Converted to *CONTACT_AUTOMATIC_NODES_TO_SURFACE

TYPE6: Converted to *CONTACT_RIGID_BODY_TWO_WAY_TO_RIGID_BODY

TYPE7: Converted to *CONTACT_AUTOMATIC_NODES_TO_SURFACE

Types 8, 10, 11 and 14 not supported.

Note that some contacts will be better translated as *CONTACT_AUTOMATIC_SINGLE_SURFACE. The user will need to review the contacts and decide this .

ELAST (law 1): Translated to *MAT_ELASTIC.

PLAS_JOHNS (law 2): If m is zero then there are no temperature effects and *MAT_SIMPLIFIED_JOHNSON_COOK is used. Otherwise *MAT_JOHNSON_COOK is used.

PLAS_BRIT (law 27): Translated to *MAT_098 (Simplified Johnson Cook).

HONEYCOMB (law 28): Translated to either *MAT_HONEYCOMB or to *MAT_MODIFIED_HONEYCOMB.
If iflag1 != iflag2 - Translated to *MAT_126 along with a warning message.
If iflag1= iflag2=0 - x = x/(1+x) ; New entry is inserted into beginning of load curve if current 1st entry is positive; Translated to *MAT_026.
If iflag1 = iflag2 = 1 - Translated to *MAT_126.
If iflag1 = iflag2 = 1 - Translated to *MAT_126; SFA = 1; AOPT, MACF set to 0.
Checks are thrown in to see whether any MAT_MODIFIED_HONEYCOMB types use a solid section. If yes, and if no other material type uses that section, element formulation value is set to 9. A warning is issued and the element formulation value is retained at 1 if other types use the section as well.

PLAS_TAB (law 36): Translated to *MAT_024 (Piecewise Linear Plasticity). Material card refers to a table that contains relevant load curves and strain rates if multiple load curves are specified. *MAT_ADD_EROSION is invoked if failure is specified.

VISC_TAB (law 38): Translated to *MAT_057 (Low Density Foam ).

Types AREA and COMMU are not supported .
Type PRES is translated to *AIRBAG_SIMPLE_PRESSURE_VOLUME.
Type GAS is translated to *AIRBAG_ADIABATIC_GAS_MODEL.
Type AIRBAG is translated to *AIRBAG_SIMPLE_AIRBAG_MODEL. No attempt is made to translate the airbag properties . Only the surface is translated (to a *SET_SEGMENT).

/PROP/SHELL (pid 1) translated to *SECTION_SHELL

/PROP/TRUSS (pid 2) translated to *SECTION_BEAM with ELFORM = 3 (truss).

/PROP/BEAM (pid 3) translated to *SECTION_BEAM with ELFORM = 2 (resultant beam).

/PROP/SPRING (pid 4) translated to *SECTION_BEAM with ELFORM = 6 (discrete beam). A *MAT_ELASTIC_SPRING_DISCRETE_BEAM material is created for linear and non-linear elastic springs. For elasto-plastic springs a *MAT_INELASTIC_SPRING_DISCRETE_BEAM material is created.
Note that if B is non-zero the log term used in the Radioss and Dyna formulations will be used and this is not the same.
Note that hardening types > 1 have no equivalent.

/PROP/RIVET (pid 5) properties are copied to any *CONSTRAINED_SPOTWELD elements created from /RIVET elements. Fn is translated to SN. Ft is translated to SS. N and M on the *CONSTRAINED_SPOTWELD are set to 1.0. The maximum length and rotation flag are not supported .

/PROP/SOL_ORTHO (pid 6) translated to *SECTION_SOLID.
Relevant *ELEMENT_SOLID cards are converted to *ELEMENT_SOLID_ORTHO cards.
Local material directions are also inserted.

/PROP/SPR_GENE (pid 8) and /PROP/SPR_BEAM (pid 13) translated to *SECTION_BEAM with ELFORM = 6 (discrete beam). A *MAT_GENERAL_SPRING_DISCRETE_BEAM material is created.
Note that if B is non-zero the log term used in the Radioss and Dyna formulations will be used and this is not the same.
Note that hardening types > 1 have no equivalent.
SCOOR is set to 2 if all beams that refer to parts that, in turn, refer to this section are of finite length
SCOOR is set to 0 if all beams that refer to parts that, in turn, refer to this section are of zero length
SCOOR is set to 2 if we have a mixture; zerolength beams are then added to a set and a warning issued.

/PROP_SH_SANDW (pid 11) translated to *SECTION_SHELL.
*PART cards are created for each layer.
Relevant *INTEGRATION_SHELL card written.

/PROP/SOLID (pid 14) translated to *SECTION_SOLID.
Calls DEF_SOLID if elform is set to 0.

Translated to *CONSTRAINED_NODAL_RIGID_BODY with a PNODE node.
Note values of ICOG other than 1 are ignored (there is no equivalent in Ansys LS-DYNA). Mass and inertia properties are ignored (there is no equivalent in Ansys LS-DYNA).
INERTIA option is now invoked if positive components of inertia tensor are input along with positive value of mass.
If the tensor is spherical a small perturbation is added to Ixx.
If a local coordinate system is given and the tensor has off diagonal terms this is illegal for IRCS=1 in Ansys LS-DYNA. In this case the tensor is rotated back to the global system and IRCS, CID and CID2 are all set to zero.

/RWALL/CYL is translated to *RIGIDWALL_GEOMETRIC_CYLINDER.
/RWALL/SPHER is translated to *RIGIDWALL_GEOMETRIC_SPHERE
/RWALL/PLANE is translated to *RIGIDWALL_PLANAR
/RWALL/PARAL is translated to *RIGIDWALL_PLANAR_FINITE

Moving rigid walls are only supported for the PLANE and PARAL types.

Translated to *DATABASE_CROSS_SECTION_SET cards.
Note that the 3 nodes defining the plane are ignored and the output will be in the global coordinate system. To get output in a local coordinate system in LS-DYNA an *ELEMENT_SEATBELT_ACCELEROMETER would need to be made with the 3 nodes (which would be referenced on the *DATABASE_CROSS_SECTION_SET card). This is not done because the *ELEMENT_SEATBELT_ACCELEROMETER needs to be on a rigid body. Making the 3 nodes part of a rigid body could significantly alter the results .
If a triangle group is used as well as a shell group the shells in the triangle group will be added to the shell group. Check that this will not cause problems elsewhere.
If secondary nodes are used as well as a node group the secondary nodes will be added to the node group. Check that this will not cause problems elsewhere.

If the shell has a thickness it is translated to *ELEMENT_SHELL_THICKNESS, otherwise *ELEMENT_SHELL.

It is assumed that there are no label clashes with /SHELL elements.

Only types NODE, SHEL, SH3N, BRIC, QUAD, BEAM, TRUSS and SPRING (i.e. nodes and elements) are translated. For type NODE, if there is a skew frame it is translated to *DATABASE_HISTORY_NODE_LOCAL_ID. Everything else is translated to *DATABASE_HISTORY_xxx_ID where xxx is the appropriate type.

*DATABASE_RWFORC and *DATABASE_SECFORC files are used by both the /TH cards and the RADIOSS Engine keyword /ANIM/VECT/FOPT. The /TH keywords grab their DT value from the /TFILE keyword (if present). The /ANIM/VECT/FOPT keyword gets its DT value from the /ANIM/DT keyword (if present). In case of a clash, the /TH and /TFILE keywords take preference over the /ANIM keywords.