539.375

constant amplitude loading, single overloading, surface crack, non-canonical contour, crack growth rate.

In the paper, the authors experimentally investigated the growth of low-alloy steel surface cracks under constant amplitude loading and under single overloads. Surface semi-elliptical cracks of canonical shape, as well as cracks with a contour of complex geometry were considered. Each overload increased the number of cycles of crack growth retardation, with higher significance in non-canonical surface cracks. The contour of surface cracks also changed in single-overload condition.

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3. Pokrovskij V. V., Tkach Yu. V., Ivanchenko A. G. Metodika ocenki ostatochnoj dolgovechnosti elementov konstrukcij s poverhnostnymi treshinopodobnymi defektami. Soobshenie 1. Modelirovanie razvitiya poverhnostnoj ustalostnoj treshiny. Problemy prochnosti. 1996. № 1. Р. 36–47. [In Russian].
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7. Spravochnik po koefficientam intensivnosti napryazhenij / рod red. Yu. Murakami. M.: Mir, 1990. T. 1, T. 2. 1016 p. [In Russian].
8. Yasniy P., Pidgurskyi I. Research of SIF of two interacting semi-elliptical surface cracks using finite element method. Bulletin of TNTU. Volume 74. No. 2. P. 15–25. [In Ukrainian].
9. Yasnii P. V., Pidhurskyi I. M., Stashkiv M. Ya., Pidhurskyi M. I. Modeliuvannia zlyttia komplanarnykh piveliptychnykh trishchyn metodom skinchenykh elementiv. In-Service Damage of Materials, its Diagnostics and Prediction: рroceeding of the International Scientific and Technical Conference (Tern., 24–27 September 2019.). Т.: ТNТU, 2019. P. 128–132. [In Ukrainian].
10. Mahnenko V. I. Resurs bezopasnoj ekspluatacii svarnyh soedinenij i uzlov sovremennyh konstrukcij. K.: Nauk. dumka, 2006. 619 p. [In Russian].
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12. Panasyuk V. V., Sushinskij A. I., Kacov K. B. Razrushenie elementov konstrukcij s neskvoznymi treshinami. Kiev: Nauk. dumka, 1991. 172 p. [In Russian].

1. Iasnii P. V., Pyndus Yu. I., Yasnii O. P. Mitsnist i dovhovichnist elementiv konstruktsii za zminnoi amplitudy navantazhennia: monohrafiia. Ternopil: vyd-vo TNTU imeni Ivana Puliuia, 2013. 173 p. [In Ukrainian].
2. Enrico Salvati, Hongjia Zhang, Kai Soon Fong, Xu Song, Alexander M. Korsunsky Separating plasticity-induced closure and residual stress contributions to fatigue crack retardation following an overload. Journal of the Mechanics and Physics of Solids. Volume 98. 2017. P. 222–235.
3. Pokrovskij V. V., Tkach Yu. V., Ivanchenko A. G. Metodika ocenki ostatochnoj dolgovechnosti elementov konstrukcij s poverhnostnymi treshinopodobnymi defektami. Soobshenie 1. Modelirovanie razvitiya poverhnostnoj ustalostnoj treshiny. Problemy prochnosti. 1996. № 1. Р. 36–47. [In Russian].
4. Mehanika razrusheniya i prochnost materialov: sprav. Posobie / рod red. V. V. Panasyuka. Kiev: Naukova dumka, 1990. T. 4. 680 p. [In Russian].
5. Lebedinskij S. G. Moskvitin G. V. Vliyanie peregruzok na razvitie ustalostnyh treshin v lityh detalyah zheleznodorozhnyh konstrukcij. Problemy mashinostroeniya i nadezhnosti mashin. 2010. № 5.
   Р. 145–152. [In Russian].
6. Fleck N. A., Smith I. F. C. and Smith R. A. Сlosure behaviour of surface cracks. Fatigue & Fracture of Engineering Materials & Structures. Volume 6. Issue 3. 1983. P. 225–239.
7. Spravochnik po koefficientam intensivnosti napryazhenij / рod red. Yu. Murakami. M.: Mir, 1990. T. 1, T. 2. 1016 p. [In Russian].
8. Yasniy P., Pidgurskyi I. Research of SIF of two interacting semi-elliptical surface cracks using finite element method. Bulletin of TNTU. Volume 74. No. 2. P. 15–25. [In Ukrainian].
9. Yasnii P. V., Pidhurskyi I. M., Stashkiv M. Ya., Pidhurskyi M. I. Modeliuvannia zlyttia komplanarnykh piveliptychnykh trishchyn metodom skinchenykh elementiv. In-Service Damage of Materials, its Diagnostics and Prediction: рroceeding of the International Scientific and Technical Conference (Tern., 24–27 September 2019.). Т.: ТNТU, 2019. P. 128–132. [In Ukrainian].
10. Mahnenko V. I. Resurs bezopasnoj ekspluatacii svarnyh soedinenij i uzlov sovremennyh konstrukcij. K.: Nauk. dumka, 2006. 619 p. [In Russian].
11. Mashinostroenie. Tom IV-1. Detali mashin. Konstrukcionnaya prochnost. Trenie, iznos, smazka / рod obsh. red. K. V. Frolova. M.: Mashinostroenie, 1995. 864 p. [In Russian].
12. Panasyuk V. V., Sushinskij A. I., Kacov K. B. Razrushenie elementov konstrukcij s neskvoznymi treshinami. Kiev: Nauk. dumka, 1991. 172 p. [In Russian].