Radioss

2021

Home
Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
Starter Input
This manual provides a list of all the model definition keywords and options available in Radioss.
Materials
Hyper and Visco-elastic Materials

What's New
Overview
Tutorials
User Guide
Reference Guide
Example Guide
Verification Problems
Frequently Asked Questions
Theory Manual
User Subroutines
Starter Input
Engine Input

Index

2021

Radioss

What's New
View new features for Radioss 2021.
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
  Radioss format 2021 uses the 12x extension format.
- Single File Input
  This format allows running either Starter or Engine with the same file.
- New Keywords in 2021
  New and modified features in Radioss.
- Starter Input
  This manual provides a list of all the model definition keywords and options available in Radioss.
  - 2D and 3D Analysis Options
  - Starter Keywords Syntax
    Block Format Keyword
  - Smooth Particle Hydrodynamics (SPH)
  - Computational Fluid Dynamics (CFD)
  - General Controls
    Block Format Keyword In this group, keywords are used to set default value, global parameter, analysis type, input/output print, damping and ALE and CFD treatment for the whole model. For default value, it is still possible to overwrite in each specific keywords.
  - Nodes
    Block Format Keyword In Radioss, two node types are available. They use Cartesian coordinate to describe the position of each node.
  - Elements
    Block Format Keyword
  - Component and Parts Organization
    Block Format Keyword In this group, keywords are used to combine material and property information (/PART), assemble model (/SUBSET) or define a separate model (//SUBMODEL).
  - Interfaces
    Block Format Keyword Interfaces solve the contact and impact conditions between two parts of a model. Several interface types are available in Radioss and use different contact treatments.
  - Materials
    - Material Compatibility
      Block Format Keyword The following tables lists the compatibility options for each of the material laws.
    - Elasto-plastic Materials
    - Hyper and Visco-elastic Materials
      - /MAT/LAW33 (FOAM_PLAS)
        Block Format Keyword This law models a viscous-elastic foam material with unloading/reloading like plastic behavior. This law is applicable only for solid elements and is typically used to model low density, closed cell polyurethane foams such as impact limiters.
      - /MAT/LAW34 (BOLTZMAN)
        Block Format Keyword This law describes the Boltzmann (visco-elastic) material. This law is applicable only for solid elements and can be used to model polymers and elastomers.
      - /MAT/LAW35 (FOAM_VISC)
        Block Format Keyword This law describes a visco-elastic foam material using Generalized Maxwell-Kelvin-Voigt model where viscosity is based on Navier equations.
      - /MAT/LAW38 (VISC_TAB)
        Block Format Keyword This law describes the visco-elastic foam tabulated material and can only be used with solid elements.
      - /MAT/LAW40 (KELVINMAX)
        Block Format Keyword This law describes the generalized Maxwell-Kelvin material. This law can only be used with solid elements.
      - /MAT/LAW42 (OGDEN)
        Block Format Keyword This keyword defines a hyperelastic, viscous, and incompressible material specified using the Ogden, Mooney-Rivlin material models.
      - /MAT/LAW62 (VISC_HYP)
        Block Format Keyword This law describes the hyper visco-elastic material. This law is compatible with solid and shell elements. In general it is used to model polymers and elastomers.
      - /MAT/LAW69
        Block Format Keyword This law is an extension of /MAT/LAW42 (OGDEN) and defines a hyperelastic and incompressible material specified using the Ogden, Mooney-Rivlin material models.
      - /MAT/LAW70 (FOAM_TAB)
        Block Format Keyword This law describes the visco-elastic foam tabulated material. This material law can be used only with solid elements.
      - /MAT/LAW77
        Block Format Keyword This open cell foam material law is a generalization of LAW70. It accounts for a non-viscous compressible ideal gas flow inside of the foam and its interaction with the foam structure.
      - /MAT/LAW82
        Block Format Keyword This keyword defines the Ogden material. This law is compatible with solid and shell elements. In general it is used to model polymers and elastomers.
      - /MAT/LAW88
        Block Format Keyword This law represents the behavior of a hyperelastic material with strain rate effects. This law is generally used to model incompressible rubbers, polymers, foams, and elastomers. It is defined by a family of stress vs strain curves at different strain rates.
      - /MAT/LAW90
        Block Format Keyword This law describes the visco-elastic foam tabulated material. This material law can be used only with solid elements.
      - /MAT/LAW92
        Block Format Keyword This law describes the Arruda-Boyce material model, which can be used to model hyperelastic behavior.
      - /MAT/LAW94 (YEOH)
        Block Format Keyword This law describes the YEOH material model, which can be used to model incompressible hyperelastic behavior. This law is only compatible with solid elements.
      - /MAT/LAW95 (BERGSTROM_BOYCE)
        Block Format Keyword This law is a constitutive model for predicting the nonlinear time dependency of elastomer like materials.
      - /MAT/LAW100 (MNF)
        Block Format Keyword The multi network framework or MNF is used to model polymers and elastomers with nonlinear viscous behavior.
      - /MAT/LAW101
        Block Format Keyword This law is a time and temperature dependent material model for thermoplastic polymers using a thermodynamic approach with physically-based multiscale internal state variables. This law is only available for solid elements.
    - Composite and Fabric Materials
    - Concrete and Rock Materials
    - Honeycomb Materials
    - Connection Materials
    - Other Materials
    - Multi-Material, Fluid and Explosive Materials
    - ALE and CFD Options
      Block Format Keyword ALE and CFD options used to active ALE formulation or Eulerian formulation for a given material law.
    - Viscosity Option
    - Leakage Option
    - Thermal Option
    - Equation of State
    - Failure Models
  - Properties
    Block Format Keyword
  - Monitored Volumes (Airbags)
    Block Format Keyword Monitored volumes could be used for airbag or tire. The monitored volumes must be inside of closed surface.
  - Constraints
    Block Format Keyword Radioss supports several different kinematic constraints, which are mainly used to impose acceleration, velocity, displacement or temperature in structure or constraint the moving of structure. They are mutually exclusive for each degree-of-freedom (DOF). Two kinematic conditions applied to the same node may be incompatible.
  - Load Cases
    Block Format Keyword In Radioss the following load cases are available. Stress/strain as initial state could be considered by modeling, as well as pressure, gravity, and thermal load.
  - Tools
    Block Format Keyword In this group, tools like transformation, frames, skews, and curve are introduced.
  - Groups(Sets)
    Block Format Keyword Keywords in this group are used to define how to select a group of node, part, elements, lines, or surfaces.
  - Adaptive Meshings
    Block Format Keyword Adaptive Meshing is used in metal forming to divide the element to better describe the geometry. /ADMESH/GLOBAL and /ADMESH/SET are not available for SPMD computation.
  - Output Database
    Block Format Keyword Time histories output for different element groups, section output, or gauge output are described in this group.
  - Obsolete
    Block Format Keyword Keywords that are still supported, but no longer maintained (*) are considered obsolete.
- Engine Input
  This manual provides a list of all the solution definition keywords and options available in Radioss.
- LS-DYNA Input (Beta)
  This manual contains an alphabetical 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
- Definitions
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 a user’s subroutines.
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.

View All Altair HyperWorks Help

Radioss

2021

Home
Reference Guide
This manual provides a detailed list of all the input keywords and options available in Radioss.
Starter Input
This manual provides a list of all the model definition keywords and options available in Radioss.
Materials
Hyper and Visco-elastic Materials

What's New
Overview
Tutorials
User Guide
Reference Guide
Example Guide
Verification Problems
Frequently Asked Questions
Theory Manual
User Subroutines
Starter Input
Engine Input

Index

Hyper and Visco-elastic Materials

/MAT/LAW33 (FOAM_PLAS)
Block Format Keyword This law models a viscous-elastic foam material with unloading/reloading like plastic behavior. This law is applicable only for solid elements and is typically used to model low density, closed cell polyurethane foams such as impact limiters.
/MAT/LAW34 (BOLTZMAN)
Block Format Keyword This law describes the Boltzmann (visco-elastic) material. This law is applicable only for solid elements and can be used to model polymers and elastomers.
/MAT/LAW35 (FOAM_VISC)
Block Format Keyword This law describes a visco-elastic foam material using Generalized Maxwell-Kelvin-Voigt model where viscosity is based on Navier equations.
/MAT/LAW38 (VISC_TAB)
Block Format Keyword This law describes the visco-elastic foam tabulated material and can only be used with solid elements.
/MAT/LAW40 (KELVINMAX)
Block Format Keyword This law describes the generalized Maxwell-Kelvin material. This law can only be used with solid elements.
/MAT/LAW42 (OGDEN)
Block Format Keyword This keyword defines a hyperelastic, viscous, and incompressible material specified using the Ogden, Mooney-Rivlin material models.
/MAT/LAW62 (VISC_HYP)
Block Format Keyword This law describes the hyper visco-elastic material. This law is compatible with solid and shell elements. In general it is used to model polymers and elastomers.
/MAT/LAW69
Block Format Keyword This law is an extension of /MAT/LAW42 (OGDEN) and defines a hyperelastic and incompressible material specified using the Ogden, Mooney-Rivlin material models.
/MAT/LAW70 (FOAM_TAB)
Block Format Keyword This law describes the visco-elastic foam tabulated material. This material law can be used only with solid elements.
/MAT/LAW77
Block Format Keyword This open cell foam material law is a generalization of LAW70. It accounts for a non-viscous compressible ideal gas flow inside of the foam and its interaction with the foam structure.
/MAT/LAW82
Block Format Keyword This keyword defines the Ogden material. This law is compatible with solid and shell elements. In general it is used to model polymers and elastomers.
/MAT/LAW88
Block Format Keyword This law represents the behavior of a hyperelastic material with strain rate effects. This law is generally used to model incompressible rubbers, polymers, foams, and elastomers. It is defined by a family of stress vs strain curves at different strain rates.
/MAT/LAW90
Block Format Keyword This law describes the visco-elastic foam tabulated material. This material law can be used only with solid elements.
/MAT/LAW92
Block Format Keyword This law describes the Arruda-Boyce material model, which can be used to model hyperelastic behavior.
/MAT/LAW94 (YEOH)
Block Format Keyword This law describes the YEOH material model, which can be used to model incompressible hyperelastic behavior. This law is only compatible with solid elements.
/MAT/LAW95 (BERGSTROM_BOYCE)
Block Format Keyword This law is a constitutive model for predicting the nonlinear time dependency of elastomer like materials.
/MAT/LAW100 (MNF)
Block Format Keyword The multi network framework or MNF is used to model polymers and elastomers with nonlinear viscous behavior.
/MAT/LAW101
Block Format Keyword This law is a time and temperature dependent material model for thermoplastic polymers using a thermodynamic approach with physically-based multiscale internal state variables. This law is only available for solid elements.

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