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Information × Registration Number 0222U000118, 0121U110515 , R & D reports Title Predicting the critical state of heat-resistant long-service steels to reduce the risk of energy failures popup.stage_title Head Krechkovska Halyna V., д.т.н. Registration Date 03-01-2022 Organization Physico-Mechanical Institute named after GV Karpenko of the National Academy of Sciences of Ukraine popup.description2 A mathematical model is proposed for predicting changes in the ultimate strength of of heat-resistant steel 15Kh1M1, based on the well-known solution of the problem with tensile a body with a periodic system of collinear cracks. The relationship between the intensity of tensile forces, the distance between the cracks, their size and the size of the pre-fracture zones in the vicinity of operational defects is found. The beginning of the merging of the pre-fracture zones at the tips of the nearest defects was taken as the condition for material destruction. A dependence has been obtained that makes it possible to make predictive estimates of a decrease in the ultimate strength of long-term operation of steel on steam pipelines of different units, due to its additional damage under the influence of shutdown numbers of TPP units corresponding to this steel. To do this, it is only necessary to calculate the fraction of the steel resource loss according to normalized technological indicators, such as the operation lifetime of and the number of shutdowns of the units.  Product Description popup.authors Holovchuk Myroslav Ya. Krechkovsʹka Halyna V. Lisnichuk Andriy М. Chornen`kyj Andriy B. Shtoyko Ivan P. popup.nrat_date 2022-03-09 Close