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WCFA'18-FKM

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 the fatigue analysis of weldments is extensively discussed in next two days. In order to better suit the needs of participants and to fit the course better to the level of their knowledge, several variants of the course are provided as shown in the table below.

Monday
Nov 26, 2018
V1 - Introduction to Fatigue
M. Růžička, J. Papuga, J. Jurenka
V4 - Fatigue of Non-Welded Components V5 - Complete Course
Tuesday
Nov 27, 2018
V2 - Complete FKM-Guideline
R. Rennert
V3 - FKM - Non-Welded Components
Wednesday
Nov 28, 2018

The complete programme can be downloaded here as a pdf file.

Introduction to Fatigue

This part is covered in variants: Introduction to Fatigue (V1), Fatigue of Non-Welded Components (V4), Complete Course (V5).

Monday, November 26, 2018
8:00-8:50   Registration
8:50-9:00 Jan Papuga Welcome info
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
11:00-12:30 Jan Papuga Factors Affecting Fatigue Life (various other issues that can be encountered)
Strain-Life Based Fatigue (cyclic plasticity, Neuber correction)
Processing of Load Records (rainflow, damage accummulation)
An example of the workflow
12:30-13:30   Lunch
13:30-14:30 Josef Jurenka Fracture Mechanics and Crack Propagation
14:30-15:00 Josef Jurenka Introduction to Fatigue Prediction in Welds
15:00-15:30   Coffee break
15:30-17:00 Jan Papuga Multiaxial Fatigue
The Concept of FE Based Fatigue Analysis
Available Software Applications
Available Data Sources

FKM - Non-Welded Components

This part is included in all variants except of Introduction to Fatigue (V1).

Tuesday, November 27, 2018
8:00-8:50   Registration
8:50-9:00 Jan Papuga Welcome info
9:00-10:30 Roland Rennert General introduction into FKM-Guideline:
Basics to stress formulations and strength assessment
Basic philosophy, application range, formal structure of FKM-Guideline.
10:30-11:00   Coffee break
11:00-12:30 Roland Rennert Static strength assessment for non-welded components:
Assessment stresses: calculation of combined stress
Material strength: static strength values from standards or from drawing, technological size factor, temperature factor
Component strength: Section factor, Neuber’s hyperbola and critical strain, plastic notch factor
Safety factors
Result of static strength assessment: degree of utilisation
Example: Centre pin of a tram (static strength)
12:30-13:30   Lunch
13:30-15:00 Roland Rennert Fatigue strength assessment for non-welded components:
Assessment stresses: stress spectrum, proportional and non-proportional stresses
Material strength: fatigue strength factor
Component strength: design factor (Kt-Kf-ratio, surface roughness, …), mean stress factor and Haigh diagram
15:00-15:30   Coffee break
15:30-17:00 Roland Rennert Fatigue strength assessment for non-welded components:
Cumulative damage approach: generalised S-N curves, Miner’ rule with modifications and effective damage sum, inverse calculation of Miner’s rule and derivation of variable amplitude factor, equivalent stress amplitude
Safety factors
Result of fatigue strength assessment: degree of utilisation
Example: Centre pin of a tram (fatigue strength)
20:00-22:00(?)   BOWLING & Billiard Dejvice (informal social meeting, www.bowling.cz)

FKM - Welded Components

This part is covered only within variants Complete FKM-Guideline (V2) and Complete Course (V5).

Wednesday, November 28, 2018
8:00-9:30 Roland Rennert Assessment stresses for welded components:
Coordinate system on weld line
Nominal stresses, structural stresses, effective notch stresses
Consideration of misalignment
Static strength assessment for welded components:
Assessment for base material, heat affected zone and welding
Material strength: softening factor for aluminium
Component strength: weld factor for steel and aluminium
Safety factors and utilisation
9:30-10:00   Coffee break
10:00-11:30 Roland Rennert Fatigue strength assessment for welded components:
Component strength: FAT-class, FAT-factor, thickness factor
Residual stress factor and mean stress sensitivity
S-N curves for welded joints in different standards
Safety factors and utilisation
Academic example: butt weld with bore hole under variable amplitude load
Application example: T-Joint with countersink
11:30-12:30   Lunch
12:30-14:00 Roland Rennert Fatigue strength assessment based on measured stresses:
Preparations: suitable measurement values, sample rate, measurement duration
Correction of measurement data
Combination of partial measurements
Rain-flow counting
Mean stress transformation
Application of equivalent stress amplitude
14:00-14:30   Coffee break
14:30-16:00 Roland Rennert Fatigue strength assessment based on measured data:
Hints to database and synthetic S-N-curves
Hints to experimental estimation of fatigue strength values: pearl line method, horizon method, stair case method

 

 


Timetables of past volumes


papuga@pragtic.com, last update: November 30, 2018

Czech Society for Mechanics

FME   CTU in Prague

 

 

 

EXTERN LINKS:

Title PragTic

FADOFF Project

Design and Fatigue of Weldments

Vibration Fatigue Analysis

D&DT for Aircraft Engineers