Advantageous Description of Short Fatigue Crack Growth Rates in Austenitic Stainless Steels with Distinct Properties

0544868 - ÚFM 2022 RIV CH eng J - Článek v odborném periodiku
Trávníček, Lukáš - Kuběna, Ivo - Mazánová, Veronika - Vojtek, Tomáš - Polák, Jaroslav - Hutař, Pavel - Šmíd, Miroslav
Advantageous Description of Short Fatigue Crack Growth Rates in Austenitic Stainless Steels with Distinct Properties.
Metals. Roč. 11, č. 3 (2021), č. článku 475. E-ISSN 2075-4701
Grant CEP: GA ČR(CZ) GJ19-25591Y
Institucionální podpora: RVO:68081723
Klíčová slova: short fatigue crack * large scale yielding * low cycle fatigue * J-integral * austenitic stainless steel * residual lifetime prediction
Obor OECD: Materials engineering
Impakt faktor: 2.695, rok: 2021
Způsob publikování: Open access
https://www.mdpi.com/2075-4701/11/3/475

In this work two approaches to the description of short fatigue crack growth rate under large-scale yielding condition were comprehensively tested: (i) plastic component of the J-integral and (ii) Polak model of crack propagation. The ability to predict residual fatigue life of bodies with short initial cracks was studied for stainless steels Sanicro 25 and 304L. Despite their coarse microstructure and very different cyclic stress-strain response, the employed continuum mechanics models were found to give satisfactory results. Finite element modeling was used to determine the J-integrals and to simulate the evolution of crack front shapes, which corresponded to the real cracks observed on the fracture surfaces of the specimens. Residual fatigue lives estimated by these models were in good agreement with the number of cycles to failure of individual test specimens strained at various total strain amplitudes. Moreover, the crack growth rates of both investigated materials fell onto the same curve that was previously obtained for other steels with different properties. Such a aster curve was achieved using the plastic part of J-integral and it has the potential of being an advantageous tool to model the fatigue crack propagation under large-scale yielding regime without a need of any additional experimental data.
Trvalý link: http://hdl.handle.net/11104/0321668