Altair Radioss

2020.1

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
Composite and Fabric Materials

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

Index

2020.1

Altair Radioss

What's New
View new features for Radioss 2020.1.
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
  Radioss format 2020 uses the 12x extension format.
- Single File Input
  This format allows running either Starter or Engine with the same file.
- New Keywords in 2020
  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
    - Composite and Fabric Materials
      - /MAT/LAW12 (3D_COMP)
        Block Format Keyword This law describes a solid material using the Tsai-Wu formulation that is usually used to model composites. This material is assumed to be 3D orthotropic-elastic before the Tsai-Wu criterion is reached.
      - /MAT/LAW14 (COMPSO)
        Block Format Keyword This law describes an orthotropic solid material using the Tsai-Wu formulation that is mainly designed to model uni-directional composites. This material is assumed to be 3D orthotropic-elastic before the Tsai-Wu criterion is reached. The material becomes nonlinear afterwards.
      - /MAT/LAW15 (CHANG)
        Block Format Keyword This law is used to model composite shell elements, similar to LAW25. The plastic behavior is based on the Tsai-Wu criteria (/MAT/LAW25 (COMPSH) for Tsai-Wu description) and failure is based on the Chang-Chang failure criterion is used.
      - /MAT/LAW19 (FABRI)
        Block Format Keyword This law defines an elastic orthotropic material and is available only for shell elements. It is used to model airbag fabrics.
      - /MAT/LAW25 (COMPSH)
        Two variations of the same material law type 25 are implemented: Tsai-Wu formulation and CRASURV formulation.
      - /MAT/LAW58 (FABR_A)
        Block Format Keyword This law describes a hyperelastic anisotropic fabric material. It uses an anisotropic coordinate system with anisotropy angle, following element deformation.
    - 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.
- 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.
HyperWorks Solver Run Manager
The HyperWorks Solver Run Manager is a unified utility that allows the user to start different HyperWorks Solvers.
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

Altair Radioss

2020.1

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
Composite and Fabric Materials

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

Index

Composite and Fabric Materials

/MAT/LAW12 (3D_COMP)
Block Format Keyword This law describes a solid material using the Tsai-Wu formulation that is usually used to model composites. This material is assumed to be 3D orthotropic-elastic before the Tsai-Wu criterion is reached.
/MAT/LAW14 (COMPSO)
Block Format Keyword This law describes an orthotropic solid material using the Tsai-Wu formulation that is mainly designed to model uni-directional composites. This material is assumed to be 3D orthotropic-elastic before the Tsai-Wu criterion is reached. The material becomes nonlinear afterwards.
/MAT/LAW15 (CHANG)
Block Format Keyword This law is used to model composite shell elements, similar to LAW25. The plastic behavior is based on the Tsai-Wu criteria (/MAT/LAW25 (COMPSH) for Tsai-Wu description) and failure is based on the Chang-Chang failure criterion is used.
/MAT/LAW19 (FABRI)
Block Format Keyword This law defines an elastic orthotropic material and is available only for shell elements. It is used to model airbag fabrics.
/MAT/LAW25 (COMPSH)
Two variations of the same material law type 25 are implemented: Tsai-Wu formulation and CRASURV formulation.
/MAT/LAW58 (FABR_A)
Block Format Keyword This law describes a hyperelastic anisotropic fabric material. It uses an anisotropic coordinate system with anisotropy angle, following element deformation.

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