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Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
LS-DYNA Input
This manual provides a list of LS-DYNA input files available in Radioss.
*SET
*SET_SEGMENT
LS-DYNA Input Interface KeywordDefines a surface defined by 3 or 4 node segments.

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What's New
View new features for Radioss 2024.1.
Overview
Radioss^® is a leading explicit finite element solver for crash and impact simulation.
Tutorials
Discover Radioss functionality with interactive tutorials.
User Guide
This manual provides details on the features, functionality, and simulation methods available in Altair Radioss.
Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
- File Extensions and Formats
  Current Radioss format uses the 12x extension format.
- Single File Input
  This format allows running either Starter or Engine with the same file.
- New Keywords in 2024
  New and modified features in Radioss.
- Starter Input
  This manual provides a list of all the model definition keywords and options available in Radioss.
- Engine Input
  This manual provides a list of all the solution definition keywords and options available in Radioss.
- LS-DYNA Input
  This manual provides a list of LS-DYNA input files available in Radioss.
  - *AIRBAG
  - *BOUNDARY
  - *CONSTRAINED
  - *CONTACT
  - *CONTROL
  - *DAMPING
  - *DATABASE
  - *DEFINE
  - *ELEMENT
  - *EOS
  - *HOURGLASS
    LS-DYNA Input Interface KeywordDefine solid and hourglass formulation for 8-node solid elements.
  - *INCLUDE
  - *INITIAL
  - *INTEGRATION_SHELL
    LS-DYNA Input Interface KeywordDefine user-defined through the thickness integration rules for the composite shell element.
  - *KEYWORD
    LS-DYNA Input Interface KeywordThis keyword should always be the first card of the input file. Optionally used with *CONTROL_UNITS card to specify model units.
  - *LOAD
  - *MAT
  - *NODE
    LS-DYNA Input Interface KeywordDefines a node number and nodal coordinates in the global coordinate system.
  - *PART
    LS-DYNA Input Interface KeywordDefines a part, which combines material and property information.
  - *RIDIGWALL
  - *SECTION
  - *SET
    - *SET_BEAM
      LS-DYNA Input Interface KeywordThis keyword defines a set of beams based on a list of beams in various ways.
    - *SET_BEAM_ADD
      LS-DYNA Input Interface KeywordDefines a set of beam elements based on a list of set of beam elements.
    - *SET_BEAM_INTERSECT
      LS-DYNA Input Interface KeywordThis keyword defines a set from the intersection of set lists of beam elements.
    - *SET_DISCRETE
      LS-DYNA Input Interface KeywordDefines a set of springs based on a list of springs in various ways.
    - *SET_DISCRETE_ADD
      LS-DYNA Input Interface KeywordDefines a set of discrete elements based on a list of set of discrete elements.
    - *SET_DISCRETE_INTERSECT
      LS-DYNA Input Interface KeywordThis keyword defines a set of from the intersection of set lists of discrete elements.
    - *SET_NODE
      LS-DYNA Input Interface KeywordDefines a set of nodes based on a list of nodes in various ways.
    - *SET_NODE_ADD
      LS-DYNA Input Interface KeywordThis keyword defines a set of nodes from a list of existing sets.
    - *SET_NODE_INTERSECT
      LS-DYNA Input Interface KeywordThis keyword defines a set from the intersection of set lists of nodes.
    - *SET_PART
      LS-DYNA Input Interface KeywordDefines a set of parts based on a list or generates a list by specifying a range of part IDs.
    - *SET_PART_ADD
      LS-DYNA Input Interface KeywordThis keyword defines a set of parts from a list of existing part sets.
    - *SET_SEGMENT
      LS-DYNA Input Interface KeywordDefines a surface defined by 3 or 4 node segments.
    - *SET_SEGMENT_ADD
      LS-DYNA Input Interface KeywordDefines a set of segments based on a list of set of segments.
    - *SET_SEGMENT_INTERSECT
      LS-DYNA Input Interface KeywordThis keyword defines a set from the intersection of set lists of segments.
    - *SET_SHELL
      LS-DYNA Input Interface KeywordThis keyword defines a set of shells based on a list of shells in various ways.
    - *SET_SHELL_ADD
      LS-DYNA Input Interface KeywordDefines a set of shell elements based on a list of set of shell elements.
    - *SET_SHELL_INTERSECT
      LS-DYNA Input Interface KeywordThis keyword defines a set from the intersection of set lists of shell elements.
    - *SET_SOLID
      LS-DYNA Input Interface KeywordThis keyword defines a set of solids based on a list of solids in various ways.
    - *SET_SOLID_ADD
      LS-DYNA Input Interface KeywordDefines a set of solid elements based on a list of sets of solid elements.
    - *SET_SOLID_INTERSECT
      LS-DYNA Input Interface KeywordThis keyword defines a set from the intersection of set lists of solid elements.
- Optimization Keywords
  Optimization Keyword This manual contains the description of the keywords for the Radioss optimization. This manual is compatible with the version 2018 of Radioss.
- Multi-Domain
  This manual contains the description of the keywords for the Radioss Multi-Domain.
- Other Files
- Definition
Example Guide
This manual presents examples solved using Radioss with regard to common problem types.
Verification Problems
This manual presents solved verification models.
Frequently Asked Questions
This section provides quick responses to typical and frequently asked questions regarding Radioss.
Theory Manual
This manual provides detailed information about the theory used in the Altair Radioss Solver.
User Subroutines
This manual describes the interface between Altair Radioss and user subroutines.

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*SET_SEGMENT

LS-DYNA Input Interface KeywordDefines a surface defined by 3 or 4 node segments.

Format


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
*SET_SEGMENT_{OPTION1}_{OPTION2}
`set_ID`

If OPTION1 = <BLANK>, repeat the following line, as needed.


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
`N_ID1`	`N_ID2`	`N_ID3`	`N_ID4`

If OPTION1 = GENERAL


(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
`TYPE`	`E1`	`E2`	`E3`	`E4`	`E5`	`E6`	`E7`

Definition


Field	Contents	SI Unit Example
`set_ID`	Set identifier. (Integer)
`OPTION1`	BLANK GENERAL
`OPTION2`	<BLANK> Default Each set is treated separately. Sets cannot share the same ID. COLLECT All *SET_SEGMENT with this option and the same ID are combined together into a single set.
`N_ID1` - `N_ID4`	Node IDs, 4 per line. (Integer)
`TYPE`	BOX Shell segments and external solid segments inside the listed boxes `E1` to `E3` are added to the set. BOX_SHELL Segments from shell elements inside the listed boxes `E1` to `E3` are added to the set. BOX_SLDIO All (internal and external) segments from elements inside the listed boxes `E1` to `E3` are added to the set. BOX_SOLID External segments from solid elements inside the listed boxes `E1` to `E3` are added to the set. DBOX Segments inside the listed boxes `E1` to `E3` are removed from the set. DBOX_SHELL Segments from shell elements inside the listed boxes `E1` to `E7` are removed from the set. DBOX_SOLID Segments from solid elements inside the listed boxes `E1` to `E7` are removed from the set. DPART Segments from parts inside the listed boxes `E1` to `E7` are removed from the set. DSEG Segments defined by nodes `E1` to `E4` are removed from the set. PART Shell segments and external solid segments from part list `E1` to `E3` are added to the set. PART_IO All (internal and external) segments from part list `E1` to `E3` are added to the set. SEG Segment defined by nodes `E1` to `E4` is added to the set. SET_SHELL Segments from shell set list `E1` to `E3` are added to the set. SET_SOLID External segments from solid set list `E1` to `E3` are added to the set. SET_SLDIO All (internal and external) segments from solid set list `E1` to `E3` are added to the set. SET_TSHELL External segments from thickshell set list `E1` to `E3` are added to the set. SET_TSHIO All (internal and external) segments from thickshell set list `E1` to `E3` are added to the set. SHELL Segments from shell list `E1` to `E3` are added to the set. No default
`E1` - `E7`	Entity IDs, 7 per line (Integer)

Comments

This keyword maps to /SET.
The option “_TITLE” can be added to the end of this keyword. When “_TITLE” is included, an extra 80 characters long line is added after the keyword input line which allows an entity title to be defined.