Experience the eprdv-Engineering Difference:

• FEA Based Fatigue Design
• The Elements of a Life Estimation System
• An Overview of the FEA Based Fatigue Environment
• Different Philosophies and Life Estimation Models
• Design Philosophies
• Safe-Life
• Fail-Safe
• Damage-Tolerant
• Integrated Durability Management
• Life Prediction Methods
• Stress-Life (S-N, or Nominal Stress) Approach
• Strain-Life (Crack-Initiation or Critical-Location Approach)
• Crack Propagation Models
• The Stress-Life (S-N) Approach
• Defining Stress Cycles
• The S-N Curve
• Limits of the S-N Curve
• The Role of Stress Concentration
• The Influence of Mean Stress
• Variable Amplitude Response - Block Loading and Palmgren-Miner
• Variable Amplitude Loading - Rainflow Cycle Counting
• Material and Component S-N Curves
• Material S-N Curves
• Component S-N Curves
• FE Hints and Tips - S-N approach
• Component S-N Curves
• Nodal vs Element Averaging
• Spot Welds
• Welds
• KT and Kf Values Within an FE Model

• The Stress-Strain Curve
• Elastic and Plastic Strain
• Cyclic Stress-Strain Behaviour
• Cyclic Loading Under Strain Control
• Hysteresis Loop Shape
• Estimating a Strain-Time History
• Retaining Mean Stress Information
• The Strain-Life Curve
• The Effect of Mean Stress
• The Morrow Mean Stress Correction
• FE Hints and Tips - e-N Approach
• Element vs Nodal Results
• Weld Analysis, Component Material Curves and Composites

• Fatigue Cracks Start
• The Concept of Stress Intensity
• Fatigue Crack-Propagation and LEFM
• Stresss Intensity Factor K Versus Compliance-Function Y
• Nominal Stress With a Compliance-Function in FE Based Crack Growth Calculations
• FEA in Generating Compliance-Functions
• Using Fracture Mechanics in Damage-Tolerant Design
• Aircraft Engine Mounting Lug FE Based Fatigue Analysis
• S-N Analysis
• Crack Growth Prediction
• FE Hints and Tips - Crack Growth
• The Use of Crack Tip Elements
• Picking a Nominal Stress

• Multi-axial Stress-Strain States
• Separate Tensile and Torsion Loading
• Combined Tensile and Torsional Loading
• Characterisation of Stress States
• Proportional Multi-axial Responses
• Equivalent Stress-Strain Approaches
• Dealing with Non-Proportional Responses
• FE Hints and Tips - Multi Axial Fatigue
• 3D, 2D and 1D Models
• Multi Modal Response to Single Input Loading

• Alternative Descriptions of Engineering Processes
• The Frequency Domain
• Power Spectral Density (PSD)
• Characterization of Engineering Processes Using Statistical Measures
• Time Histories & PSDs
• Expected Zeros, Peaks and Irregularity Factor
• Moments From a PSD
• Expected Zeros, Peaks and Irregularity Factor From a PSD
• The Transfer Function
• Modal Transient (Superposition) Fatigue Analysis
• Fatigue Life Estimation From PSDs
• Time Domain Stress-Life Fatigue Life Estimation
• S-N Relationship
• Estimating Fatigue Life From a Stress pdf
• The Frequency Domain Model
• Narrow Band Solution
• Empirical Correction Factors (Tunna, Wirsching, Hancock, Chaudhury and Dover)
• Dirlik's Empirical Solution for Rainflow Ranges
• Bishop's Theoretical Solution for Rainflow Ranges
• Clipping Ratio as a Function of rms
• Simple Vibration Fatigue Hand Calculation
• Time Domain By Hand
• Frequency Domain By Hand
• Computer Based Calculations Using MSC.Fatigue
• FE Hints and Tips - Vibration Fatigue
• Calculation of Frequency Response Function (Transfer Function)
• Verifying Vibration Fatigue Results

• Introduction
• Process Issues
• Model Building
• Requirements
• Observations
• P-type element
• Meshing
• Dealing with Loads
• FEA Based Global Analysis Options
• Analysis Options
• FE Results output type
• FE Based Local Analysis Options
• Absolute Maximum Principal Stress and Signed Von Mises
• The Choice of Element Centroid Versus Nodal Results
• Pre Processing of Loading Data
• Post Processing of FE Based Fatigue Results
• Accuracy of Fatigue Life Estimates
• General Conclusions