2023.1

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Tutorials
Discover OptiStruct functionality with interactive tutorials.
Classic HyperMesh Tutorials
Tutorials using Classic HyperMesh.
Advanced Small Displacement Finite Element Analysis
OS-T: 1340 Fatigue (Stress - Life) Method

What's New
Overview
Tutorials
User Guide
Reference Guide
Example Guide
Verification Problems
Frequently Asked Questions

2023.1

What's New
View new features for OptiStruct 2023.1.
Overview
OptiStruct is a proven, modern structural solver with comprehensive, accurate and scalable solutions for linear and nonlinear analyses across statics and dynamics, vibrations, acoustics, fatigue, heat transfer, and multiphysics disciplines.
Tutorials
Discover OptiStruct functionality with interactive tutorials.
- Run OptiStruct at the Command Line
- Classic HyperMesh Tutorials
  Tutorials using Classic HyperMesh.
  - Run OptiStruct from HyperMesh
  - Basic Small Displacement Finite Element Analysis
  - Advanced Small Displacement Finite Element Analysis
    - OS-T: 1300 Direct Frequency Response Analysis of a Flat Plate
      This tutorial demonstrates how to import an existing FE model, apply boundary conditions, and perform a finite element analysis on a flat plate.
    - OS-T: 1305 Modal Frequency Response Analysis of a Flat Plate
      This tutorial demonstrates how to import an existing FE model, apply boundary conditions, and perform a modal frequency response analysis on a flat plate.
    - OS-T: 1310 Direct Transient Dynamic Analysis of a Bracket
      In this tutorial, an existing finite element model of a bracket is used to demonstrate how to perform direct transient dynamic analysis using OptiStruct. HyperGraph is used to post-process the deformation characteristics of the bracket under the transient dynamic loads.
    - OS-T: 1315 Modal Transient Dynamic Analysis of a Bracket
      In this tutorial, an existing finite element model of a bracket is used to demonstrate how to perform modal transient dynamic analysis using OptiStruct. HyperGraph is used to post-process the deformation characteristics of the bracket under the transient dynamic loads.
    - OS-T: 1320 Nonlinear Gap Analysis of an Airplane Wing Rib
    - OS-T: 1325 Random Response Analysis of a Flat Plate
      This tutorial demonstrates how to set up the random response analysis for the existing frequency response analysis model. The setup for frequency response analysis is that the flat plate has two loading conditions that will be subjected to a frequency-varying load excitation using the direct method.
    - OS-T: 1330 Acoustic Analysis of a Half Car Model
      The purpose of this tutorial is to evaluate the vibration characteristics of a half car model subjected to Fluid - Structure interaction. The fluid that is being referred to is air. Essentially, the noise level or the sound level is evaluated inside the car at a location near the ear of the driver which is the main response location inside the fluid.
    - OS-T: 1340 Fatigue (Stress - Life) Method
      - Fatigue using S-N (Stress - Life) Method
        OptiStruct uses the S-N approach for calculating the fatigue life. The S-N approach is suitable for high cycle fatigue, where the material is subject to cyclical stresses that are predominantly within the elastic range. Structures under such stress ranges should typically survive more than 1000 cycles.
    - OS-T: 1350 Fatigue (Strain - Life) Method
    - OS-T: 1360 NLSTAT Analysis of Gasket Materials in Contact
      This tutorial demonstrates how to carry out nonlinear implicit small displacement analysis in OptiStruct involving gasket materials and contact.
    - OS-T: 1365 NLSTAT Analysis of Solid Blocks in Contact
      This tutorial demonstrates how to carry out nonlinear implicit small displacement analysis in OptiStruct, involving elasto-plastic materials, contact and continuing the nonlinear solution sequence from a preceding nonlinear loadcase.
    - OS-T: 1370 Complex Eigenvalue Analysis of a Reduced Brake System
      In this tutorial, a modal complex eigenvalue analysis is performed on a simplified brake system to determine whether the friction effects can cause any squeal noise (unstable modes).
    - OS-T: 1371 Brake Squeal Analysis of Brake Assembly
      In this tutorial you will perform a brake squeal analysis on a brake assembly. Disc brakes are operated by applying a clamping load using a set of brake pads on the disc. The friction generated between the pads and the disc causes deceleration, and can potentially induce a dynamic instability of the system. This phenomena is known as brake squeal.
    - OS-T: 1372 Rotor Dynamics of a Hollow Cylindrical Rotor
      In this tutorial you will perform Rotor Dynamics analysis on a hollow cylindrical rotor.
    - OS-T: 1375 Response Spectrum Analysis of a Structure
      This tutorial demonstrates how to perform a Response Spectrum Analysis on a structure.
    - OS-T: 1380 Computation of Equivalent Radiated Power
      Computation of the equivalent radiated power (ERP) is a simplified method to gain information about maximum dynamic radiation of panels for excitations in frequency response analysis. This tutorial demonstrates how to set up the computation request of ERP on an existing frequency response analysis.
    - OS-T: 1385 Heat Transfer Analysis on Piston Rings using Thermal Contact
      Piston rings fit on the outer surface of a piston in an engine and they transfer heat from the piston to the cylinder wall.
    - OS-T: 1390 Pretensioned Bolt Analysis of an IC Engine Cylinder Head, Gasket and Engine Block System
      This tutorial outlines the procedure to perform both 1D and 3D pretensioned bolt analysis on a section of an IC Engine. The pretensioned analysis is conducted to measure the response of a system consisting of the cylinder head, gasket and engine block connected by four head bolts subjected to a pretension force of 4500 N each.
    - OS-T: 1392 Node-to-Surface versus Surface-to-Surface Contact
      This tutorial demonstrates how to set up contact between two parts and the impact of using choosing node-to-surface (N2S) versus surface-to-surface (S2S). In addition, this tutorial covers how to review the internally created CGAPG elements in case of N2S, and the nodes in contact in case of S2S.
    - OS-T: 1393 Basics of Contact Properties and Debugging
      This tutorial demonstrates the effect of using contact stabilization, clearance, and adjust.
    - OS-T: 1394 Axi-Symmetric Ball Joint
      This tutorial demonstrates how to carry nonlinear analysis for Axi-symmetric ball joint for pull load of 10,000N using OptiStruct.
    - OS-T: 1395 Acoustic Analysis of Speaker Using RADSND
      This tutorial demonstrates how to perform acoustic analysis of 2.1 speakers using the RADSND Method.
  - Large Displacement Finite Element Analysis
  - Fluid-Structure Interaction Analysis
  - Multibody Dynamics Analysis
  - Topology Optimization
  - Topography Optimization
  - Combination Optimization
  - Size Optimization
  - Shape Optimization
  - Fatigue Analysis
  - Nonlinear Explicit Analysis
    This section presents nonlinear explicit analysis examples generated using OptiStruct. Each example uses a problem description, execution procedures, and results to demonstrate how OptiStruct is used.
  - Aeroelastic Analysis
  - Third Party Interface
- HyperMesh Tutorials
  Tutorials using HyperMesh.
- SimLab Tutorials
  Video tutorials using SimLab.
User Guide
This manual provides detailed information regarding the features, functionality, and simulation methods available in OptiStruct.
Reference Guide
This manual provides a detailed list and usage information regarding input entries, output entries, and parameters available in OptiStruct.
Example Guide
The OptiStruct Example Guide is a collection of solved examples for various solution sequences and optimization types and provides you with examples of the real-world applications and capabilities of OptiStruct.
Verification Problems
This manual presents solved verification models including NAFEMS problems.
Frequently Asked Questions
This section provides quick responses to typical and frequently asked questions regarding OptiStruct.

View All Altair HyperWorks Help

2023.1

Home
Tutorials
Discover OptiStruct functionality with interactive tutorials.
Classic HyperMesh Tutorials
Tutorials using Classic HyperMesh.
Advanced Small Displacement Finite Element Analysis
OS-T: 1340 Fatigue (Stress - Life) Method

What's New
Overview
Tutorials
User Guide
Reference Guide
Example Guide
Verification Problems
Frequently Asked Questions

OS-T: 1340 Fatigue (Stress - Life) Method

Before you begin, copy the file(s) used in this tutorial to your working directory.

ctrlarm.fem

Fatigue using S-N (Stress - Life) Method
OptiStruct uses the S-N approach for calculating the fatigue life. The S-N approach is suitable for high cycle fatigue, where the material is subject to cyclical stresses that are predominantly within the elastic range. Structures under such stress ranges should typically survive more than 1000 cycles.

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