Typical 3-Day Training Course – Fatigue and Dynamic Analysis of CAE Based Systems

This course is aimed at anyone who wants to understand more about fatigue analysis methods. The course is also relevant to design situations where dynamic (vibration) response may be important and so there may be a link between fatigue issues and the dynamic behavior. Because both fundamental principles and the most recent technical developments will be presented the course is applicable to both the graduate engineer wanting to learn more – and the senior engineer wanting to know what the state of the art methods are today. The course will give a basic overview of the methods – but from a quite unconventional perspective (concept rather than equation driven). So no prior knowledge in these fields is required. The latest developments in the field will also be presented.

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Part 1 – Fatigue, Dynamics & CAE Integration

  • History of Fatigue Methods and Their Integration into the CAE Environment
  • The concept of FE Based Fatigue Analysis
  • Commercial applications
  • Background to Dynamics For Fatigue Analysis
  • Step By Step Process For Static and Dynamic Models (Both Time and Frequency Domains)
  • Some Frequency Domain Dynamic (Vibration Fatigue) Examples
  • Background to Fatigue (Stress Based)
  • Materials Considerations
  • Loading Considerations
  • Stress-Life Based Fatigue in More Detail
  • Strain-Life Based Fatigue
  • Fracture Mechanics and Crack Propagation (Brief Treatment Only)
  • Accelerated Testing Techniques
  • Composites and Non-Metallic Materials
  • An Introduction to Weld Analysis, Wheels Fatigue, Multiaxial Fatigue and MBS

Part 2 – Vibration Fatigue

  • Vibration Environments – Random v Deterministic
  • Frequency v Time Domain
  • System Transfer Functions (Frequency Domain)
  • Choosing points on the transfer function
  • How transfer functions work
  • FFT’s and PSD’s
  • Buffers and window averaging
  • Calculating PSD’s From Time Signals
  • Classifying Time Signals and PSD’s
  • Statistics, probability and reliability
  • Loads & “Cross PSD’s”
  • Gaussian, random and stationary data
  • Zero and peak crossing rates
  • Irregularity factor
  • Root mean square (rms) value
  • Moments
  • Hand calculations from a PSD
  • Working Directly With PSD’s
  • Options For Calculating Fatigue Life From PSD’s
  • Vibration Fatigue Solvers – Narrow Band, Wirsching, Steinberg, Dirlik
  • Time Based Methods – Static, Transient, Modal Participation Factor method