Theoretical estimation of fatigue life under regular cyclic loading

Authors

  • Oleh Herasymchuk G.S. Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kyiv, Ukraine
  • Olena Herasymchuk Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine

DOI:

https://doi.org/10.20535/2521-1943.2017.79.96183

Keywords:

fatigue life, stress concentration, cyclic load ratio, high-cycle fatigue, microstructure, titanium alloys

Abstract

A model is proposed for the fatigue life estimation of the material with consideration of microstructure, stress concentration and cyclic load ratio. In the fatigue life estimation, the factors, such as grain size, stress concentration and cyclic load ratio are taken into account in the parameter representing the fatigue limit. In order to fill the model, it is sufficient to have results from monotonic tensile testing and characteristics of microstructure of the initial material. The model is tested using the fatigue testing results for specimens of Ti–6Al–4V titanium alloy condensate prepared by electron-beam physical vapor deposition method (EB PVD-method). The specimens had manufacturing defects, such as column defects of different diameters reaching the specimen surface. The model is also tested using the experimental fatigue data for the Ti–6Al–4V titanium alloy taken from the literature for various cyclic load ratios. Comparison between results of calculation and experiment showed a good agreement. The approach proposed can be used for the rapid assessment of fatigue resistance characteristics in new materials development, and also for the remaining life evaluation of structures with no costly and long-term fatigue and fatigue crack growth resistance tests

Author Biography

Olena Herasymchuk, Igor Sikorsky Kyiv Polytechnic Institute, Kyiv

Механіко-машинобудівний інститут, кафедра інтегрованих технологій машинобудування

References

  1. Herasymchuk, O.M., Kononuchenko, O.V., Markovsky, P.E. and Bondarchuk, V.I. (2016), “Calculating the fatigue life of smooth specimens of two-phase titanium alloys subject to symmetric uniaxial cyclic load of constant amplitude”, Int. J. Fatigue, No. 83, pp. 313–322, DOI: 10.1016/j.ijfatigue.2015.11.002
  2. Herasymchuk, O.M. (2011), “Nonlinear relationship between the fatigue limit and quantitative parameters of material microstructure”, Int. J. Fatigue, No. 33, pp. 649-659.
  3. Herasymchuk, O.M. (2015), “Microstructurally-dependent model for predicting the kinetics of physically small and long fatigue crack growth”, Int. J. Fatigue, No. 81, pp. 148-161.
  4. Lukas, P. and Klesnil, M. (1978), “Fatigue limit of notched bodies”, Mater. Sci. Eng., No. 34, pp. 61–66.
  5. El Haddad, M.H., Topper, T.H. and, Smith, K.N. (1979), “Prediction of non propagating cracks”, Engineering Fracture Mechanics, No. 11(3), pp. 573–584, DOI: 10.1016/0013-7944(79)90081-X
  6. Ostash, O.P., Panasyuk, V.V. (2001), “Fatigue process zone at notches”, Int. J. Fatigue, No23, pp.627–636.
  7. Frost, N.E. and Dugdale, D.S. (1957), “Fatigue tests on notched mild steel plates with measurements of fatigue cracks”, J. Mechs Phys Solids., No. 5, pp. 182–190.
  8. Chapetti, M.D. (2003), “Fatigue propagation threshold of short cracks under constant amplitude loading”, International Journal of Fatigue, No. 25, pp. 1319–1326, DOI:10.1016/S0142-1123(03)00065-3
  9. Dowling, N.E. (1999), Mechanical behavior of materials: engineering methods for deformation fracture and fatigue, 2nd (ed.), Upper Saddle River, Prentice Hall, NJ.
  10. Chan, K.S. (2003), “A microstructure – based fatigue – crack – initiation model”, Metall. Mater. Trans. A., No. 34A, pp. 43–58, DOI:10.1007/S11661-003-0207-9
  11. Herasymchuk, O.M., Sergienko, G.A., Bondarchuk, V.I., Terukov, A.V., Nalimov, Yu.S. and Gryaznov, B.A. (2006), “Fatigue strength of an ( )-type titanium alloy Ti-6Al-4V produced by the electron-beam physical vapor deposition method”, Strength of Materials, No. 38(6), pp. 651–658.
  12. Sadananda, K., Sarkar, S., Kujawski, D. and Vasudevan, A.K. (2009), “A two-parameter analysis of S-N fatigue life using and ”, Int. J. Fatigue, No. 31, pp. 1648–1659, DOI: 10.1016/j.ijfatigue.2009.03.007
  13. Peters, J.O., Boyce, B.L., Chen, X., McNaney, J.M., Hutchinson, J.W. and Ritchie, R.O. (2002), “On the application of the Kitagawa–Takahashi diagram to foreign-object damage and high-cycle fatigue”, Engineering Fracture Mechanics, No. 69, pp. 1425–1446.

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Published

2017-06-22

How to Cite

[1]
O. Herasymchuk and O. Herasymchuk, “Theoretical estimation of fatigue life under regular cyclic loading”, Mech. Adv. Technol., no. 1(79), pp. 49–56, Jun. 2017.

Issue

Section

Original study