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Registration Number

0119U101732, ( 0224U002024  ) R & D request

Title

Development of methods for assessing fatigue damage of metallic materials at stages the origin and growth of cracks

Head

Tsybanov Heorhii V., д.т.н.

Registration Date

08-05-2019

Organization

GS Pisarenko Institute of Strength Problems of the National Academy of Sciences of Ukraine

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Investigation of the features of the accumulation of fatigue damage in structural steels and alloys at the stages of incubation and the growth of short fissure cracks for the effects of these stages of a different sequence of high and low loading amplitudes and a static component characteristic of the real range of loading of machines and structures. To solve the problem will be analyzed modern experimentalmethods of research and theoretical description of fatigue damage in the early stages of fatigue (incubation and growth of short cracks), the necessary improvements to existing equipment for the possibility of experimental tracking of the early stages of fatigue in steels and alloys, carried out such experiments for constant and variables modes of cyclic loading and the laws of accumulation of fatigue damage in these modes are established. Summarizing the methods for describing these stages in literary sources and having their own approaches to such a description at constant load amplitudes, methods for assessing fatigue damage and durability of metallic materials for variable load amplitudes will be developed and tested on the experimental data obtained. The implementation of the general plan of research presented will enable to obtain results for making significant corrections to the methods of assessing fatigue damage and the resource of structural elements for operating modes of cyclic loading, and thus, based on modern treatments of the stage of the fatigue process, improve methods for calculating the durability of structural elements. Since most of the failures of machines and structures in operation is due to the fatal destruction of their elements, the result of the planned GDR represents an important and relevant result aimed at increasing the reliability and durability of modern machine-building products

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2024-12-10