Fatigue strength, laws of inelastic deformation, and microcrack nucleation in steel 15Kh2MFA
A study is made of steel 15Kh2MFA and its resistance to low-cycle deformation, inelastic characteristics, and mechanical properties, as well as the parameters of surface microcracks formed after cyclic loading of specimens of this material. The steel is studied in two states: initial and embrittled. It is established that, with allowance for the change in the non-dangerous component of energy, the total energy of fatigue fracture is invariant relative to the number of cycles to crack nucleation. It is shown that increases in the number of loading cycles and total energy dissipation are accompanied by an increase in the mean length and density of surface macrocracks and a decrease in the mean distance between them.
KeywordsFatigue Mechanical Property Total Energy Energy Dissipation Cyclic Loading
Unable to display preview. Download preview PDF.
- 1.V. T. Troshchenko, P. V. Yasnii, V. V. Pokrovskii, et al., “Effect of one-time preliminary plastic deformation on crack resistance. Report No. 1. Growth rate of fatigue cracks in heat-resistant steel,” Probl. Prochn., No. 12, 9–14 (1988).Google Scholar
- 2.V. T. Troshchenko and V. I. Dragan, “Study of the laws governing the inelastic deformation and fatigue fracture of metals in torsion,” Ibid., No. 3, 14–21 (1982).Google Scholar
- 3.V. T. Troshchenko, “Criterion of the fatigue strength of metals and alloys based on consideration of energy dissipation,” in: Energy Dissipation in the Vibrations of Systems [in Russian], Naukova Dumka, Kiev (1966), pp. 168–177.Google Scholar
- 4.V. V. Pokrovskii and Yu. S. Skorenko, “Effect of temperature and regime of cyclic loading on the laws governing the fracture of steels 15Kh2MFA and 15Kh2NMFA,” Probl. Prochn., No. 10, 53–59 (1984).Google Scholar
- 5.N. A. Makhutov, Strain Criteria of Failure and the Strength Design of Elements [in Russian], Mashinostroenie, Moscow (1981).Google Scholar
- 6.S. V. Serensen (ed.), Resistance to Deformation and Fracture under Low-Cycle Loading [in Russian], Nauka, Moscow (1967).Google Scholar