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Discover OptiStruct functionality with interactive tutorials.
Advanced Small Displacement Finite Element Analysis
OS-T: 1350 Fatigue (Strain - Life) Method

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Overview
Tutorials
User Guide
Reference Guide
Example Guide
Verification Problems
Frequently Asked Questions
HyperWorks Solver Run Manager

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Altair OptiStruct Online Help

What's New
View new features for OptiStruct 2020.
Overview
OptiStruct^® is an industry proven, modern structural analysis solver for linear and nonlinear structural problems under static and dynamic loadings.
Tutorials
Discover OptiStruct functionality with interactive tutorials.
- Access the Model Files
  Learn how to access and download required tutorial files.
- Run OptiStruct from HyperMesh
- Run OptiStruct at the Command Line
- 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
  - OS-T: 1350 Fatigue (Strain - Life) Method
    - Fatigue using E-N (Strain - Life) Method
      The E-N (Strain - Life) method should be chosen to predict the fatigue life when plastic strain occurs under the given cyclic loading. S-N (Stress - Life) method is not suitable for low-cycle fatigue where plastic strain plays a central role for fatigue behavior.
    - Fatigue Process Manager (FPM) using E-N (Strain - Life) Method
      The E-N (Strain - Life) method should be chosen to predict the fatigue life when plastic strain occurs under the given cyclic loading. S-N (Stress - Life) method is not suitable for low-cycle fatigue where plastic strain plays a central role for fatigue behavior.
  - 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. This kind of analysis provides an estimate of peak structural response to a structure subject to dynamic excitation. The analysis uses response spectra for prescribed dynamic loading and results of normal modes analysis to calculate this estimate.
  - 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 with GAP Elements
    Piston rings fit on the outer surface of a piston in an engine. They support heat transfer from the piston to the cylinder wall. This tutorial demonstrates running a heat transfer analysis on a set of piston rings.
  - 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 vs 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, adjust and smoothing.
  - 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
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.
HyperWorks Solver Run Manager
The HyperWorks Solver Run Manager is a unified utility that allows the user to start different HyperWorks Solvers.

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Altair OptiStruct Online Help

Home
Tutorials
Discover OptiStruct functionality with interactive tutorials.
Advanced Small Displacement Finite Element Analysis
OS-T: 1350 Fatigue (Strain - Life) Method

What's New
Overview
Tutorials
User Guide
Reference Guide
Example Guide
Verification Problems
Frequently Asked Questions
HyperWorks Solver Run Manager

Index

OS-T: 1350 Fatigue (Strain - Life) Method

Fatigue using E-N (Strain - Life) Method
The E-N (Strain - Life) method should be chosen to predict the fatigue life when plastic strain occurs under the given cyclic loading. S-N (Stress - Life) method is not suitable for low-cycle fatigue where plastic strain plays a central role for fatigue behavior.
Fatigue Process Manager (FPM) using E-N (Strain - Life) Method
The E-N (Strain - Life) method should be chosen to predict the fatigue life when plastic strain occurs under the given cyclic loading. S-N (Stress - Life) method is not suitable for low-cycle fatigue where plastic strain plays a central role for fatigue behavior.

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