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Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
New Keywords in 2024
New and modified features in Radioss.

Welcome
What's New
View new features for Radioss 2024.
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.
- 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.

View All Altair HyperWorks Help

New Keywords in 2024

New and modified features in Radioss.

Note: Please print this page for future reference.

New Starter Keywords

/DAMP/VREL - To define the Rayleigh mass damping relative to the average velocity of the set of nodes or the motion of the local frame
/FAIL/ORTHENERG - An orthotropic failure criterion based on fracture energy generating a stress softening.

Modified Starter Keywords

/ANALY - Removed I_subcycle which is no longer supported
/FAIL/BIQUAD - Added stress softening parameters, ICOUP, DCRIT and EXP

New Engine Keywords

/SENS/RESET - Option to reset the sensor status at the beginning of the run

New LS-DYNA Keywords

*CONTACT_ERODING_SURFACE_TO_SURFACE - Define surface to surface contact between a set of shell and solid elements
*CONTROL_PARALLEL - Define parallel arithmetic option
*ELEMENT_TSHELL - Defines 3-dimensional thick shell elements
*EOS_GRUNEISEN - Defines a Gruneisen equation of state
*MAT_030 (SHAPE_MEMORY) - Defines a super-elastic memory shape alloy material (SMA) compatible with integrated beam, solid and shell elements
*MAT_154 (DESHPANDE_FLECK_FOAM) - Defines a material for modeling aluminum foam
*MAT_187 (SAMP-1) - Defines a semi-analytical model for polymers material
*MAT_252 (TOUGHENED_ADHESIVE_POLYMER) - A non-associated elasto-plastic model for polymer adhesives
*SECTION_TSHELL - Defines the finite element properties of thick shell elements

Modified LS-DYNA Keywords

*DATABASE - Added new options, GLSTAT_MASS_PROPERTIES and SPHOUT
*ELEMENT_SHELL - Added new optional flag, BETA
*MAT_003 (PLASTIC_KINEMATIC) - Added new flag, VP

Obsolete Keywords

/INTER/TYPE22 (Obsolete)