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1

Analysis of a simplified method for determining fatigue charts deltaS-N on the example of welded and soldered connectors

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Szala G., Ligaj B.
Polish Maritime Research
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2018
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tom 25
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nr 2
The paper describes the method of determining fatigue charts ΔS-N, which is particularly useful in the description of fatigue properties of welded and soldered joints. This method is based on IIW (International Institute of Welding) guidelines and FITNET procedures. This method makes it possible to design ΔS-N charts in a probabilistic approach, which is important in the reliability analysis of structural elements. The work also contains examples of charts resulting from the development of test results for selected welded and soldered joints
2

Problems of equivalent load amplitude in fatigue life calculations

100%
Ligaj B., Soltysiak R.
Polish Maritime Research
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2016
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tom 23
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nr 1
This paper presents issues of fatigue life calculations in operational load conditions. The assumed runs were so processed as to get a set of sinusoidal cycles by using the following methods: full cycles counting method and rainflow counting method. On the basis of such sets of cycles of the varying parameters Sm i and Sa i were prepared block load spectra of equivalent amplitudes Saz , obtained with the use of an original method of these authors, in which two-parameter fatigue characteristics were applied. The work resulted in comparison of fatigue life results for load spectra determined by using the assumed cycles counting methods and the assumed two-parameter fatigue characteristics: the model IM, model II, model III and model IV, respectively
3

Aspekt techniczny pozyskiwania energii odpadowych w przemyśle

100%
Walczak A., Ligaj B.
Ekologia i Technika
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2015
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tom 23
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nr 5
4

Comparative analysis of fatigue life calculation methods of C45 steel in conditions of variable amplitude loads in the low- and high-cycle fatigue ranges

100%
Ligaj B., Szala G.
Polish Maritime Research
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2012
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tom 19
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nr 4
In the paper [1] assumptions for fatigue life calculations in the low- and high- cycle fatigue ranges of metal alloys, have been formulated. Three calculation methods: that expressed in stresses, strains and a mixed (stress-strain) one, have been there presented. In this paper results of fatigue life calculations of C45 steel performed in line with the above mentioned methods have been described, and their comparative analysis has been made. The calculations have been carried out for two-level and multi-level load programs of the varying parameters: maximum load within a load program and different values of spectrum filling factor. The comparative analysis of the results of fatigue life calculations in compliance with the above mentioned methods makes it possible to assess differences in the results and depenendence of the differences on values of load program parameters
5

Experimental verification of two-parametic models of fatigue characteristics by using the tests of S55J0 steel as an example

100%
Ligaj B., SzalaG.
Polish Maritime Research
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2010
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tom 17
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nr 1
This paper presents experimental verification of models of two-parametric fatigue characteristics N(σa , σm ) on the basis of results of fatigue tests of specimens made of S355J0 steel. On the basis of comparative analysis of results of computations and fatigue life tests of the specimens, performed under constant amplitude sinusoidal loads of different cycle asymmetry ratios, the most versatile models were distinguished. The tests in question were carried out in the high-cycle fatigue range
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