A method for determining the period of sub-critical growth of a semielliptical creep-fatigue crack in the internal surface of a pipe wall of the steam pipeline is proposed. The crack is located near the ring weld in the field of residual stresses in the heat-affected zone. The dependence of the residual resource of the pipe of a steam pipeline with the weld joint on the location of the centre of the crack relative to the axis of the weld is ascertained.
[1] G. P. Karzov, V. P. Leonov, and B. T. Timofeev, Svarnye sosudy vysokogo davleniia: prochnost i dolgovechnost [Welded vessels of high pressure: strength and durability]. Leningrad, Russia: Mashinostroenie Publ., 1982. [in Russian].
[2] V. I. Kyr’ian, V. A. Osadchuk, and M. M. Nykolyshyn, Mekhanika ruinuvannia zvarnykh z’iednan metalokonstruktsii [Mechanics of destruction of welded joints of metal structures]. Lviv, Ukraine: Spolom Publ., 2007. [in Ukrainian].
[3] G. P. Karzov, et al., “Vliianie ostatochnykh napriazhenii na traektoriiu i skorost rasprostraneniia treshchiny pri tciklicheskom nagruzhenii svarnykh soedinenii” [“Influence of residual stresses on a trajectory and speed of a crack propagation at cyclic loading of welded joints”], Avtomaticheskaia svarka [Automatic welding], no. 3, pp. 5-10, 1986. [in Russian].
[4] F. A. Khromchenko, Resurs svarnykh soedinenii paroprovodov [Resource of welded joints of steam pipelines]. Moscow, Russia: Mashinostroenie Publ., 2002. [in Russian].
[5] O. Ye. Andreikiv, R. M. Lesiv, and I. Ya. Dolinska, “Zalezhnist periodiv dokrytychnoho rostu povzucho-vtomnoi trishchyny vid periodu tsyklu navantazhennia” [“Dependence of periods of subcritical growth of creeping-fatigue crack on the loading cycle period”], Fizyko-khimichna mekhanika materialiv [Physical and chemical mechanics of materials], no. 4, pp. 31-38, 2009. [in Ukrainian].
[6] O. Ye. Andreikiv, I. Ya. Dolinska, and N. V. Yavorska “Otsinka periodiv zarodzhennia i poshyrennia povzucho-vtomnykh trishchyn v tonkostinnykh elementakh konstruktsii” [“Estimation of periods of origin and distribution of creeping-fatigue cracks in thin-walled elements of structures”], Fizyko-khimichna mekhanika materialiv [Physical and chemical mechanics of materials], no. 3, pp. 7-15, 2011. [in Ukrainian].
[7] V. I. Makhnenko, Resurs bezopasnoi ekspluatatcii svarnykh soedinenii i uzlov sovremennykh konstruktcii [Resource of safe operation of welded joints and units of modern structures]. Kyiv, Ukraine: Naukova dumka Publ., 2006. [in Russian].
[8] Y. Murakami, Stress intensity factors handbook. vols. 1-2, Oxford, UK: Pergamon Press, 1987.
[9] S. E. Kovchik, and E. M. Morozov, Kharakteristiki kratkovremennoi treshchinostoikosti materialov i metody ikh opredeleniia [Characteristics of short-term crack resistance of materials and methods for their determination]. Kyiv, Ukraine: Naukova dumka Publ., 1988. [in Russian].
[10] Romaniv O. N., et al., Ustalost i tciklicheskaia treshchinostoikost konstruktcionnykh materialov [Fatigue and cyclic crack resistance of structural materials]. Kyiv, Ukraine: Naukova dumka Publ., 1990. [in Russian].
[11] O. Ye. Andreikiv, and N. B. Sas, “Vyznachennia zalyshkovoho resursu truby z poverkh¬nevoiu trishchynoiu pry dovhotryvalomu tysku i vysokii temperaturi” [“Determination of the residual life of a pipe with a superficial crack under long-term pressure and high temperature”], Mashynoznavstvo [Machines science], no. 4, pp. 3-6, 2005. [in Ukrainian].
[12] Yu. V. Banakhevych, O. Ye. Andreikiv, and M. B. Kit, “Vplyv roztashuvannia vidnosno zvarnoho shva poverkhnevoi trishchyny v stintsi truby na zalyshkovu dovhovichnist zvarnoho z’iednannia” [“The effect of the location of the weld on the surface cracks in the pipe wall on the residual durability of the welded joint”], Naukovyi visnyk IFNTUNH [Scientific Herald of Ivano-Frankivsk National Technical University of Oil and Gas], no. 2 (16), pp. 108-112, 2007. [in Ukrainian].
[13] D. N. Gladwin, et al., “Creep, fatigue and creep-fatigue crack growth rates in parent and simulated HAZ type 321 stainless steel,” Fatigue and Fract. Eng. Mater. and Struct., vol. 11, no. 5, pp. 355-370, 1988. https://doi.org/10.1111/j.1460-2695.1988.tb01389.x