2021
This manual provides detailed information about the theory used in the Altair Radioss Solver.
Radioss element library contains elements for one, two or three dimensional problems.
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Radioss® is a leading explicit finite element solver for crash and impact simulation.
Discover Radioss functionality with interactive tutorials.
This manual provides details on the features, functionality, and simulation methods available in Altair Radioss.
This manual provides a detailed list of all the input keywords and options available in Radioss.
This manual presents examples solved using Radioss with regard to common problem types.
This manual presents solved verification models.
This section provides quick responses to typical and frequently asked questions regarding Radioss.
Nonlinear finite element analyses confront users with many choices. An understanding of the fundamental concepts of nonlinear finite element analysis is necessary if you do not want to use the finite element program as a black box. The purpose of this manual is to describe the numerical methods included in Radioss.
Multistrand elements are n-node springs where matter is assumed to slide through the nodes.
Kinematic constraints are boundary conditions that are placed on nodal velocities. They are mutually exclusive for each degree of freedom (DOF), and there can only be one constraint per DOF.
The stability of solution concerns the evolution of a process subjected to small perturbations. A process is considered to be stable if small perturbations of initial data result in small changes in the solution. The theory of stability can be applied to a variety of computational problems.
Interfaces solve the contact and impact conditions between two parts of a model.
A large variety of materials is used in the structural components and must be modeled in stress analysis problems. For any kind of these materials a range of constitutive laws is available to describe by a mathematical approach the behavior of the material.
An airbag is defined as a monitored volume. A monitored volume is defined as having one or more 3 or 4 node shell property sets.
Explicit scheme is generally used for time integration in Radioss, in which velocities and displacements are obtained by direct integration of nodal accelerations.
The performance criterion in the computation was always an essential point in the architectural conception of Radioss. At first, the program has been largely optimized for the vectored super-calculators like CRAY. Then, a first parallel version SMP made possible the exploration of shared memory on processors.
This manual describes the interface between Altair Radioss and a user’s subroutines.
This manual provides a list of all the model definition keywords and options available in Radioss.
This manual provides a list of all the solution definition keywords and options available in Radioss.
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See Nonlinear Dashpot; the explanation is the same as for spring TYPE4.