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Fatigue Lounge


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Title PragTic


PragTic SW





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FME CTU in Prague

Fatigue Lounge

The Fatigue Lounge is understood as a place, where pieces of information concerning fatigue, fatigue analysis, fatigue events, fatigue postprocessors are provided. The events managed by me, however, are located in the section Events, lectures.

Jan Papuga

PragTic Freeware Project

Final example processed in FEMAP

PragTic project is aimed at development of a freeware tool for an automated fatigue damage calculation based on a FE-solution or done at an isolated point with no relation to FEA. It started as a programming work intended to support the preparation of my PhD thesis. After completion of the thesis, the PragTic software remained in a state, which showed its possible highly efficient use, but also how many further improvements have to be done. Since I did not want to leave the program as is and let it be forgotten in two years, I tried to find ways to continue in its development.
I would not spend so long time if I had not been persuaded that there are some substantial reasons for this my activity. Some of them can be found on Concept page or in the analysis available in this pdf file.
It should be highlighted here, that the development of PragTic SW was forcedly abandoned in 2015. What you can find here cannot be further modified under given circumstances.

Fatigue Data

Results of DFI for various groups

The use of PragTic allowed me generation of a vast amount of data that can help others to understand limits of current multiaxial high-cycle methods. The data are saved within a MySQL database FatLim, which in conjuction with the PhP language allows presentation of data in a quite interactive mode.
I do not know about any such a broad analysis of this problem and the results are apparently quite worse than those usually reported in research papers. It seems that the activity of researchers is too often impeded by two facts: (1) unavailability of some fatigue solver that would allow fast implementation of new methods and their efficient and quick testing (PragTic solves this problem nicely); (2) unavailability of experimental data for testing of new proposals.
The end of PragTic development mentioned above caused some mess also in this section. Remnants of the previous activity can be found in the Database section.
This section is further populated by some data items related to our publications.

FABER Project

FABER logo

All my previous experience gained while building PragTic and various fatigue databases taught me one:
It is extremely difficult to find enough statistically representative fatigue data that can be used to build up the benchmark data sets, on which the various fatigue calculation methods could be validated. This constrains many PhD studies in the quality of validation, or it extends the time necessary to collect enough experimental outputs. Surprisingly, it is even more complicated to apply such benchmarks to existing fatigue solvers and to deliver the results to public. FABER project responds to it.

Events, lectures

WCFA2023-FKM-NL logo

This section was built when the activities in organizing various fatigue workshops got broader, and I started to deal not only with the WCFA series. In addition to it, you can find here links to the freely available recordings from the 1st Workshop on Thermodynamics of Fatigue Process, links to the workshops on Damage Tolerance, and above all something special, where I hope for many future inputs - the freely available recordings from various specialized lectures.

Fatigue Data Repository


Weld Data

Bike in-service record

Fatigue Strength estimation via Machine Learning methods



FABER Project



pyLife workshop 2023


Events, Lectures

Workshops on Computational Fatigue Analysis

Workshops on Computational Fatigue Analysis 2023 - FKM Guideline Non-Linear

1st Workshop on Thermodynamics of Fatigue Process

Recorded Lectures

D&DT for Aircraft Engineers

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Development in 2011-2014 supported by:
Alfa programme