Modified Low Cycle Method as a New Criterion for a Life Fatigue Assessment in Foundry Industry

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Abstract

The study describes the investigations of fatigue life carried out on selected grades of the G20Mn5 cast steel by two methods, i.e. the standard low-cycle fatigue test (LCF test) and modified low-cycle fatigue test (MLCF). The aim of these investigations was to verify the reliability of tests conducted by the novel method of MLCF [1, 2, 3].

Table 1 shows the results of mechanical tests carried out in accordance with the MLCF methodology on the G20Mn5 cast steel, while Figures 1a-b and 2 show the selected σ = f (ε) curves. Similar studies were carried out for the Mn-Ni cast steel [4].

Low-cycle fatigue tests (LCF) were carried out on an MTS 810 testing machine with control of force exerted on specimens whose dimensions were specified in [2].

[1] St. Kocańda, A. Kocańda, Niskocyklowa wytrzymałosc zmeczeniowa metali, PWN, Warszawa 1989. [Low-cycle fatigue strength of metals].

[2] M. Maj, Kryteria wytrzymałosci eksploatacyjnej odlewów zeliwnychwoparciuowłasciwosci mechaniczne tworzyw. DSc Thesis Kraków 1984. [Criteria of the performance strength of iron castings based on the mechanical properties of materials].

[3] M. Maj, Zastosowanie zmodyfikowanej niskocyklowej próby zmeczeniowej do wyznaczania własciwosci mechanicznych zeliwa ADIw temperaturze podwyzszonejipokojowej, Projekt badawczy 4 T08B 006 25 Kraków 2005. [Application of modified low-cycle fatigue test in determination of the mechanical properties of ADIat elevated and room temperatures. Research Project No. 4 T08B 006 25 Kraków 2005].

[4] M. Maj, Amethod for determination of complete mechanical characteristics of heterogeneous-structure materials, Metoda wyznaczania pełnej charakterystyki mechanicznej materiału o niejednorodnej strukturze Archives of Foundry Engineering / Polish Academy of Sciences. Commission of Foundry Engineering 9, 83-86 (2009).

[5] M. Maj, B. Kalandyk, Badania wytrzymałosciowewzakresie małej liczby cykli staliwa Mn-Ni. Materials Engineering 10, 3, 203-206 (2003). [Low-cycle fatigue testing of the Mn-Ni cast steel].

[6] PN-84/H-04334 Badania niskocyklowego zmeczenia metali. [Testing low-cycle fatigue of metals].

Archives of Metallurgy and Materials

The Journal of Institute of Metallurgy and Materials Science and Commitee on Metallurgy of Polish Academy of Sciences

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