Investigation of Low-Cycle Fatigue on Structural Carbon Steel

O.A. Nasibullina; Rif G. Rizvanov; E.Sh. Gaysin

doi:10.4028/www.scientific.net/KEM.887.646

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 887Investigation of Low-Cycle Fatigue on Structural...

Investigation of Low-Cycle Fatigue on Structural Carbon Steel

Abstract:

It is possible to explain the phenomenon of fatigue destruction and the patterns that are observed only in the deep study of the processes taking place in the material under conditions of repeated-variable loading, i.e. in the development of the physical theory of metal fatigue. Despite the large number of work on this issue, there is currently no single interpretation of the process of fatigue destruction of metals, which is primarily due to the exceptional complexity of the problem. The purpose of the study is to study low-cycle corrosion fatigue of steel using the example of A 414 Grade A steel. The work solved problems, such as research of kinetics of crack development in conditions of low-cycle loading of metal structure made of carbon structural steel A 414 Grade A. Regression analysis has also been applied to predict a change in the thermodynamic stability of the metal during cyclic loading. Analysis of fatigue crack development at alternating loading cycle was carried out. The results of calculations based on the proposed model of elastoplastic deformation near the top of the crack at the sign-alternating loading cycle can be described by non-linear dependence. The regression analysis revealed that the correlation coefficient of the selected model is-0.93, which indicates a relatively strong relationship between the variables. In experimental way it has been proved that reduction of thermodynamic stability of metal in corrosive medium is connected with increase of number of loading cycles, which leads to accumulation of fatigue damages.

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Periodical:

Key Engineering Materials (Volume 887)

Pages:

646-650

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.887.646

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Online since:

May 2021

Authors:

O.A. Nasibullina*, Rif G. Rizvanov, E.Sh. Gaysin

Keywords:

Corrosion, Crack, Deformation, Durability, Low-Cycle Metal Fatigue, Mechanochemical Corrosion, Number of Loading Cycles, Regression Analysis, Stress Concentrator

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