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Optical and acoustic diagnostics of corrosion-mechanical destruction of structural elements

Work number - M 14 AWARDED

Presented Karpenko Physico-Mechanical Institute of the NAS of Ukraine

Kanyuk Yu І., Chornen’kyi A.B., Shtoiko I.P., Stasyshyn I.V.

Theoretical and experimental principles of state diagnostics and residual life determination of railway transport and oil pipelines mechanical elements, taking into account fatigue cracks and soil corrosion have been created. They can be effectively used both for the development of the general theory of structural elements fatigue cracking, and for their practical application in risk estimation of further operation and improving the reliability of structural elements.

The developed approach for investigation of stress-strain state of a quasi-orthotropic body with cracks and holes makes it possible to determine stress intensity factors and stress concentration factors and estimate the strength of materials with various defects based on known in the scientific literature fracture criteria.

The use of a new method of three-step phase-shift interferometry made it possible to control the surface relief of parts and structural elements during their manufacturing, testing and operation under cyclic loads to determine the most likely place of fatigue macrocrack start and their residual life by analyzing surface changes at the nanolevel.

The assessment of changes in the surface roughness (SR) of titanium alloys after chemical heat treatment provided the installation and remote control of the level of SR of untreated parts, to ultimately guarantee this SR in accordance with the requirements of the technical documentation for the product. Such control is especially important during the manufacturing and chemical-thermal treatment of surfaces of biomedical implants, pistons for various purposes, etc.

The obtained results correspond to the current level of world achievements in the field of deformable solids mechanics, which is confirmed by publications in leading scientific journals in Ukraine and abroad.

Number of publications: 42, incl. 1 monograph, 36 articles (28 - in English-language journals with an impact factor). The total number of references to the authors publications / h-index of the work, according to the databases is: Web of Science - 48/4, Scopus - 71/5. 5 patents have been received.