PSI - Issue 16

26 Andrzej Kurek et al. / Procedia Structural Integrity 16 (2019) 19–26 8 Andrzej Kurek, Justyna Koziarska, Tadeusz Łagoda, Karolina Łago da / Structural Integrity Procedia 00 (2019) 000 – 000

4. Analysis and conclusions

On the basis of the selected data from fatigue tests taken from the literature, the differences were indicated when determining fatigue characteristics between the application of small and finite (large) deformations theories when determining these characteristics, with particular consideration of constants occurring in Manson-Coffine-Basquin characteristic. It has been observed that, irrespectively of material, cyclic deformation coefficient, cyclic strengthening exponent, fatigue limit exponent and fatigue limit coefficient at tension-compression increase, in terms of the absolute value, for finite deformations; whereas, a fatigue plastic deformation exponent and fatigue plastic deformation coefficient decrease, in terms of the absolute value. These theories may be applied in particular with materials characteristic for relatively high ductility.

Acknowledgements

This work was carried out as part of the grant of the National Centre of Science No 2015/19/B/ST8/01115

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