Visn. Nac. Akad. Nauk Ukr. 2021.(1): 47-52

Iryna Ya. Dolinska
Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv, Ukraine

According to the scientific report at the meeting of the Presidium of the NAS of Ukraine, December 23, 2020

Applying the laws of thermodynamics, a general energy approach is formulated to study the delayed fracture of structural materials under the action of force load (static, cyclic, shunting mode of its change), high temperatures, hydrogen-corrosive media, neutron irradiation. Based on the energy approach process, models and forecasting methods of residual resource of structural elements in the mentioned operating conditions are developed. Based on the energy approach and the basic concepts of the acoustic-emission method, the calculation models in the parameters of the AE signals for the analytical description of the materials and structural elements delayed fracture under exploitation conditions are developed. Residual resource of the elements of power equipment (steam pipeline, elements of steam turbines), oil and gas pipelines, elements of nuclear power plants and the body of the oil hydrocracking reactor, is calculated.
Keywords: long-term operation, delayed fracture, crack, working environment, energy approach, mathematical model, residual resource.

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1. Andreykiv O.Ye., Skalskyi V.R., Dolinska I.Ya. Zapovilnene ruynuvannya materialiv za lokalnoyi povzuchos-ti (Slow fracture of materials under local creep). Lviv: Ivan Franko National University of Lviv, 2017. [in Ukraine]

2. Andreikiv O.Ye., Pustovyi V.M., Rudavskyi D.V., Dolinska I.Ya., Semenov P.O. Metody otsinyuvannya zalyshkovoyi mitsnosti ta dovhovichnosti elementiv konstruktsiy za danymy neruynivnoho kontrolyu (Methods for evaluation of residual strength and life-time of structural elements by the non-destructive testing data). Lviv: Prostir-M, 2017. [in Ukraine]

3. Dolinska I.Ya. Evaluation of the residual service life of a disk of the rotor of steam turbine with regard for the number of shutdowns of the equipment. Materials Science. 2018. 53 (5): 637-644. DOI:

4. Andreikiv O.Ye., Skal's'kyi V.R., Dolins'ka І.Ya., Dzyubyk A.R. Influence of corrosive hydrogenating media on the residual service life of structural elements in the maneuvering mode of operation. Materials Science. 2018. 54(1): 61-68. DOI:

5. Andreykiv O., Hembara O., Dolinska I., Sapuzhak Y., Yadzhak N. Prediction of Residual Service Life of Oil Pipeline Under Non-stationary Oil Flow Taking into Account Steel Degradation. In: Bolzon G., Gabetta G., Nykyforchyn H. (eds) Degradation Assessment and Failure Prevention of Pipeline Systems. Lecture Notes in Civil Engineering. Springer, 2021. Vol. 102. Р. 203-216. DOI:

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