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WCFA'16-VFA

Programme of the Workshop

The course is built in such a way, that no prior knowledge on fatigue analysis is needed. The basic principles of the common fatigue damage estimation are described in the first day, while the content related to fatigue analysis under random loading is extensively discussed in next two days. In order to better suit the needs of participants and to fit it adequately to the level of their knowledge, three variants of the course are provided - Complete Course (for all three days), or Vibration Fatigue (for the second and third days only) and Introduction to Fatigue (for the first day only).

 

Day #1 - November 8, 2016 - Tuesday - Complete Course variant, Introduction to Fatigue variant

8:45-9:00 Jan Papuga Welcome
9:00-9:45 Milan Růžička History of fatigue and fatigue estimation methods
Materials considerations
Loading considerations
9:45-10:30 Jan Papuga Stress-Life Based Fatigue, fatigue limit, factors influencing the S-N curve
10:30-11:00   Coffee break
11:00-12:15 Darrell Socie Strain-Life Based Fatigue (cyclic plasticity, Neuber correction)
Processing of Load Records (rainflow, damage accummulation)
12:15-12:45 Milan Růžička Composite Materials
12:45-14:15   Lunch
14:15-14:45 Darrell Socie Failure probability and its influence
Factors Affecting Fatigue Life (various other issues that can be encountered)
An example of the workflow
14:45-15:45 Josef Jurenka Fracture Mechanics and Crack Propagation (Brief Treatment Only)
An Introduction to Weld Analysis
15:45-16:15   Coffee break
16:15-17:45 Jan Papuga Multiaxial Fatigue
The Concept of FE Based Fatigue Analysis
Available Software Applications
Available Data Sources

 

Day #2 - November 9, 2016 - Wednesday - Complete Course variant, Vibration Fatigue variant

9:00-10:30 Neil Bishop Recap of Fatigue Methods in Relation to Random Vibration Fatigue
History of Fatigue Methods Integration into the CAE Environment
Background to Dynamics For Fatigue Analysis, Introduction to MBS
Step By Step Process For Static and Dynamic Models (Both Time and Frequency Domains)
Time Based Methods – Static, Transient, Modal Participation Factor method
Some Frequency Domain Dynamic (Vibration Fatigue) Examples
10:30-11:00   Coffee break
11:00-12:45 Neil Bishop Vibration Environments – Random v Deterministic
Random Response Estimates - Especially for Collision Detection
Frequency v Time Domain
12:45-14:15   Lunch
14:15-15:45 Neil Bishop System Transfer Functions (Frequency Domain)
Choosing points on the transfer function
How transfer functions work
15:45-16:15   Coffee break
16:15-17:45 Neil Bishop FFT’s and PSD’s
Buffers and window averaging
Calculating PSD’s From Time Signals
19:00-20:30   Evening Reception

 

Day #3 - November 10, 2016 - Thursday - Complete Course variant, Vibration Fatigue variant

8:00-9:30 Neil Bishop 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
9:30-10:00   Coffee break
10:00-11:30 Neil Bishop Moments
Hand calculations from a PSD
11:30-13:00   Lunch
13:00-14:30 Neil Bishop Working Directly With PSD’s
Options For Calculating Fatigue Life From PSD’s
Vibration Fatigue Solvers – Narrow Band, Wirsching, Steinberg, Dirlik
14:30-15:00   Coffee break
15:00-16:30 Neil Bishop Random Fatigue Response Embedded in FE Solvers
Accelerated Testing Techniques
Surrogate Loads - Process for Enveloping (Reducing and Simplifying) Loads
16:30-16:40 Jan Papuga Closing the workshop

 

 


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papuga@pragtic.com, last update: November 13, 2016

Czech Society for Mechanics

Fatigue Analysis RI s.r.o.

FME   CTU in Prague

 

 

 

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