Fatigue Quick Start Guide
Introduction
Purpose of Guide
Assumptions
Organization of Guide
Definitions
The Fatigue “Five-Box Trick”
Life Prediction Methods
FE Analysis Methods
Design Philosophies
Life Estimation Process
When to Use Which Method?
Different Methods of FE Import
MSC Nastran FE Model and Results
ABAQUS (or Advanced FEA) FE Results
ANSYS FE Results
MSC Marc FE Results
PATRAN Neutral and Result Files
I-DEAS Master Series Universal Files
MSC Patran FEA Result Files
Directory Structure
MSC Fatigue Modules
MSC Fatigue Output Files
A Simple S-N Analysis
Problem Description
Objective
Geometry
Import the Model
View the Stress Results
Set Up the Fatigue Analysis
Solution Parameters
Material Information
Loading Information
Run the Fatigue Analysis
Review the Results
View the Life Contour Plot
Tabular Listing
What If?
Concluding Remarks
Multiple Mean Stress Curve Support
Set Up the Fatigue Analysis
Run the Fatigue Analysis
Rainflow Cycle Counting
Problem Description
Objective
Set Up the Fatigue Analysis
Load the Previous S-N Analysis Parameters
Loading Information
Run the Fatigue Analysis
Rainflow Cycle Counting
Damage Summation
Speeding up the Analysis
Review the Results
Tabular Listing
Histogram Matrix
Effect of Mean Stress
Probabilistic Nature of Fatigue
Concluding Remarks
Component S-N Analysis
Problem Description
Objective
Geometry
Import the Model and Results
View the Stress Results
Set Up the Fatigue Analysis
Solution Parameters
Material Information
Loading Information
Run the Fatigue Analysis
Review the Results
View the Life Contour Plot
Tabular Listing
Design Optimization
Concluding Remarks
Batch Operations
A Simple e-N Analysis
Problem Description
Objective
Geometry
Import the Model
View the Stress Results
Set Up the Fatigue Analysis
Solution Parameters
Material Information
Loading Information
Run the Fatigue Analysis
Rainflow Cycle Counting
Elastic-Plastic Correction
Review the Results
View the Life Contour Plot
Concluding Remarks
Other Notch Corrections
Stresses vs. Strains
Residual Stress
Problem Description
Objective
Geometry
Import the Model
View the Stress Results
Set Up First Fatigue Analysis
Solution Parameters
Material Information
Loading Information
Run the Fatigue Analysis
Review the Results
Set Up Second Fatigue Analysis
Include the Residual Stress
Run the Fatigue Analysis
Review the Results
Investigate Mean Stress
Investigate Surface Finish/Treatment
Concluding Remarks
Introduction to Crack Growth
Problem Description
Objective
Geometry
Import the Model
Define a Compliance Function
Set Up the Fracture Analysis
Solution Parameters
Material Information
Loading Information
Run the Fracture Analysis
Cycle by Cycle Growth
The Fatigue Crack Propagation Rectangle
Review the Results
Tabular Listing
Interactive Operation
Optimization
Concluding Remarks
Analysis without an FE Model
MSC Fatigue Files
Design Philosophies
Problem Description
Objectives
S-N Analysis of Lug Weld
Solution Parameters
Material Information
Loading Information
Job Control
Results - Factor of Safety Analysis
ε-N Analysis of Lug
Solution Parameters
Material Information
Loading Information
Job Control
Results
LEFM Analysis of Lug
Solution Parameters
Material Information
Loading Information
Job Control
Results
Concluding Remarks
Multiple Loads
Problem Description
Objectives
S-N Analysis of Engine Mounting Lug
Solution Parameters
Material Information
Loading Information
Job Control
Results
Crack Growth Analysis of Engine Lug
Solution Parameters
Material Information
Loading Information
Job Control
Results
A Multiaxial Assessment
Problem Description
Objectives
Geometry
Import FE Model and Results
Post/Create Groups
View the Stress Results
Determine the Critical Location
Solution Parameters
Material Information
Loading Information
Job Control
Evaluate Results
Biaxiality - a Multiaxial Assessment
Concluding Remarks
Welding
Introduction
Problem Description for Spot Weld Analysis with Spot Welds Modeled as Stiff BARS
Objective
Geometry and FE Results
Define a Group of CBARS
Spot Weld S-N Analysis
Solution Parameters
Material Information
Loading Information
Job Control
Results Evaluation
Problem Description for Spot Weld Analysis with Spot Welds Modeled as CWELDS
Objective
Reading in the Model and CWELD Results
Set Up the Spot Weld Analysis
Run the Spot Weld Analysis
Problem Description for Spot Weld Analysis with Spot Welds Modeled with CHEX/MPC
Objective
Reading in the Model and CHEX/MPC Results
Convert CHEX/MPC to Equivalent BARs
Set Up the Spot Weld Analysis
Run the Spot Weld Analysis
Concluding Remarks
Problem Description for a Seam Weld Analysis
Objective
Geometry and FE Results
Creating a Weld Group
Viewing the Stress Results
Setting up the Seam Weld Analysis
Material Information
Loading Information
Listing the Fatigue Results
Concluding Remarks
Wheels Module - Analysis of Rotating Structures
Problem Description
Geometry and FE Results
Viewing the Stress Results
Setting Up the Wheels Analysis
Solution Parameters
Material Information
Loading Information
Fatigue Analysis and Results
Plotting the Fatigue Results
Wheels Interactive Menu
Concluding Remarks
A Software Strain Gauge
Problem Description
Objective
Geometry and FE Results
The Gauge Tool
FE Results Extraction
Time History Extraction
Fatigue Analysis Setup
Solution Parameters
Material Information
Loading Information
Job Control
Run Soft S/G (SSG)
Correlation Techniques
Overlays and Cross Plots
Signal Statistics
Rosette Analysis
Single Location Uniaxial Life Analyzer
Single Location Multiaxial Life Analyzer
Concluding Remarks
Dynamic Fatigue
Introduction
Objective
Analysis Using Transient Results
Transient Keyhole Job
Static Keyhole Job
Modal Superposition Method
Vibration Fatigue
Definitions
Frequency Domain Life Estimation - General Procedure
Vibration Fatigue Analysis Setup
Additional Job Setups - Multiple Load Inputs
Results
Comparison Studies
Pseudo-Static vs. PSD Approach
FE Model and Analysis
Pseudo-static Fatigue Analysis Setup
Results
Dynamic Transient vs. PSD Approach
Plot Mode Shapes
Run Vibration Analyses
Run Transient Analyses
View and Compare Results
Recreate the Transfer Function
Plot the Stationarity
Random Vibration FE Results
Temperature Corrected Fatigue Analysis
Temperature Corrected MSC Fatigue Analysis
Objective
Import the Model
Set Up the Fatigue Analysis
Run the Fatigue Analysis
Aerospace Spectrum File Support
Aerospace Spectrum File Support
Objective
File Definitions
Spectrum file
Example Spectrum File
Load Control file
Example Load Control File
Example Problem
Solution Parameters
Material Information
Loading Information
Run Fatigue Analysis
Conclusion
Multiple Fatigue Analysis (Duty Cycle Analyzer)
Introduction
Example Problem
Solution Parameters
Material Information
Loading Information
Sequence Information
Event Information
Entering Load Data
Managing the Duty Cycle Form
Job Control
Review Results
Conclusion
Fatigue Utilities
Problem Description
Fatigue Preprocessing
Low Damage Removal
Calculate Stress Gradients
Material Management
Materials Database Manager - PFMAT
ASCII Materials File Reader
Advanced Loading Utilities
Arithmetic Manipulation - MART
Multi-Channel Editor - MCOE
Rainflow Cycle Counter - MCYC
Formula Processor - MFRM
File Cut and Paste - MLEN
Multi-File Manipulation - MMFM
Peak-Valley Extraction - MPVXMUL
Simultaneous Values Analysis DAC/RPC - MSIMMAX
Amplitude Distribution - MADA
Auto Spectral Density - MASD
Fast Fourier Filtering - MFFF
Butterworth Filtration - MBFL
Frequency Response Analysis - MFRA
Statistical Analysis - MRSTATS
Header/Footer Manipulation - MFILMNP
Advanced Fatigue Utilities
Single Location S-N Analysis - MSLF
Single Location e-N Analysis - MCLF
Cycle and Damage Analysis - MCDA
Cycles File Lister - MCYL
Time Correlated Damage - MTCD
Single Location Vibration Fatigue - MFLF
Stress-Strain Analysis - mSSA
Multi-Axial Life Analysis - MMLF
Crack Growth Data Analysis - MFCG
Kt/Kf Evaluation - MKTAN
Graphical Display Utilities
Graphical Editing-mGED
Multi-File Display - mMFD
Two Parameter Display - mTPD
Polar Display - mPOD
Three Dimensional Display - mP3D
Plot File (.plt) Display - MQPLOT (for UNIX)
Plot File (.plt) Display - MWNPLOT (for Windows)
Printer and Device Setup - MPLTSYS
Plot/Pen Colors Utility - MNCPENS
File Conversion Utilities
Convert Binary .dac to ASCII - MDTA and Convert ASCII to Binary .dac - MATD
Signal Regeneration - MREGEN
Convert RPC File to .dac - MREMDAC and Convert .dac to RPC file - MDACREM
Convert PSD File to Time History (.dac)
Cross Platform Conversion - MCONFIL
Waterfall File Create - MWFLCRE
Other Utilities
Environment Settings - MENM
Miscellaneous Features
Problem Description
Element Centroidal Calculations
Group Averaging
Extracting Time Histories
Identify Critical Location
Defining Histogram Matrices
Constant Amplitude Zero Mean Time Histories
Glossary of Terms
Glossary Terms
Material Listing
Material Types
Material Listing
Alternative Names
Support
Where to Get Help
Accessing Help from a Form
Technical Support Centers
Preparing to Call the Hotline
MSC Offices
Fatigue Quick Start Guide
MSC Offices