Radioss
Radioss

2022

  1. ホーム
  2. Theory Manual

    This manual provides detailed information about the theory used in the Altair Radioss Solver.

  3. Large Displacement Finite Element Analysis Theory Manual
  4. Element Library

    Radioss element library contains elements for one, two or three dimensional problems.

  5. Beam Type Spring Elements (TYPE13)
  6. Nonlinear Elasto-Plastic Spring - Nonlinear Unloading
  • 新機能
  • 概要
  • Tutorials
  • ユーザーガイド
  • リファレンスガイド
  • 例題集
  • Verification Problems
  • よくある質問
  • Theory Manual
  • User Subroutines
  • Starter入力
  • Engine入力
索引
Radioss

2022

Radioss
  • 新機能

    Radioss 2022の新機能を確認できます。

  • 概要

    Radioss®は、衝突と衝撃ソリューションのための優れた陽解法有限要素ソルバーです。

  • Tutorials

    Discover Radioss functionality with interactive tutorials.

  • ユーザーガイド

    本マニュアルは、Altair Radiossで利用できる機能やシミュレーション手法の詳細を提供しています。

  • リファレンスガイド

    本マニュアルは、Radiossで使用することのできるすべての入力キーワードとオプションを詳細なリストで提供しています。

  • 例題集

    このマニュアルは一般的な問題のタイプに関して、Radiossを用いて解かれた例題を示します。

  • Verification Problems

    This manual presents solved verification models.

  • よくある質問

    このセクションでは、Radiossに関するよくある質問へのクィックレスポンスを提供しています。

  • Theory Manual

    This manual provides detailed information about the theory used in the Altair Radioss Solver.

    • Large Displacement Finite Element Analysis Theory Manual
      • Introduction

        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.

      • Basic Equations
      • Finite Element Formulation
      • Dynamic Analysis
      • Element Library

        Radioss element library contains elements for one, two or three dimensional problems.

        • Solid Hexahedron Elements
        • Solid Tetrahedron Elements
        • Shell Elements
        • Solid-Shell Elements
        • Truss Elements (TYPE2)
        • Beam Elements (TYPE3)
        • One Degree of Freedom Spring Elements (TYPE4)
        • General Spring Elements (TYPE8)
        • Pulley Type Spring Elements (TYPE12)
        • Beam Type Spring Elements (TYPE13)
          • Time Step
          • Linear Spring
          • Nonlinear Elastic Spring
          • Nonlinear Elasto-Plastic Spring - Isotropic Hardening
          • Nonlinear Elasto-Plastic Spring - Decoupled Hardening
          • Nonlinear Elasto-Plastic Spring - Kinematic Hardening
          • Nonlinear Elasto-Plastic Spring - Nonlinear Unloading
          • Nonlinear Dashpot
          • Nonlinear Visco-Elastic Spring
          • Skew Frame Properties
          • Sign Conventions
          • Tension
          • Shear - XY
          • Shear - XZ
          • Torsion
          • Bending About the Y Axis
          • Bending About the Z Axis
          • Multidirectional Failure Criteria
        • Multistrand Elements (TYPE28)

          Multistrand elements are n-node springs where matter is assumed to slide through the nodes.

        • Spring Type Pretensioners (TYPE32)
      • Kinematic Constraints

        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.

      • Linear Stability

        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

        Interfaces solve the contact and impact conditions between two parts of a model.

      • Material Laws

        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.

      • Monitored Volume

        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.

      • Static

        Explicit scheme is generally used for time integration in Radioss, in which velocities and displacements are obtained by direct integration of nodal accelerations.

      • Radioss Parallelization

        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.

    • ALE, CFD and SPH Theory Manual
    • Appendix A: Basic Relations of Elasticity

  • User Subroutines

    This manual describes the interface between Altair Radioss and user subroutines.

  • Starter入力

    本マニュアルは、Radiossで使用することのできるすべてのモデル定義キーワードとオプションをリストで提供しています。

  • Engine入力

    本マニュアルは、Radiossで使用することのできるすべてのソリューション定義キーワードとオプションをリストで提供しています。

Radioss
Radioss

2022

  1. ホーム
  2. Theory Manual

    This manual provides detailed information about the theory used in the Altair Radioss Solver.

  3. Large Displacement Finite Element Analysis Theory Manual
  4. Element Library

    Radioss element library contains elements for one, two or three dimensional problems.

  5. Beam Type Spring Elements (TYPE13)
  6. Nonlinear Elasto-Plastic Spring - Nonlinear Unloading
  • 新機能
  • 概要
  • Tutorials
  • ユーザーガイド
  • リファレンスガイド
  • 例題集
  • Verification Problems
  • よくある質問
  • Theory Manual
  • User Subroutines
  • Starter入力
  • Engine入力
索引

Nonlinear Elasto-Plastic Spring - Nonlinear Unloading

See Nonlinear Elasto-plastic Spring: Nonlinear Unloading; the explanation is the same as for spring TYPE4.

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