A Modified Exponential Model for Predicting the Fatigue Crack Growth Rate in a Pipeline Steel Under Pure Bending

Sergei Sherbakov; Pawan Kumar; Daria Podgayskaya; Pavel Poliakov; Vasilii Dobrianskii; Vishwanatha H M

doi:10.46604/aiti.2024.14372

Authors

Sergei Sherbakov Joint institute of mechanical engineering of the National Academy of Sciences of Belarus, Minsk, Belarus
Pawan Kumar Joint institute of mechanical engineering of the National Academy of Sciences of Belarus, Minsk, Belarus
Daria Podgayskaya Joint institute of mechanical engineering of the National Academy of Sciences of Belarus, Minsk, Belarus
Pavel Poliakov Moscow Aviation Institute (National Research University), Moscow, Russia
Vasilii Dobrianskii Moscow Aviation Institute (National Research University), Moscow, Russia
Vishwanatha H M Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, India

DOI:

https://doi.org/10.46604/aiti.2024.14372

Keywords:

exponential function, specific growth rate, fatigue crack, stress intensity factor, SDG 9

Abstract

The present work proposes a fatigue crack growth rate (FCGR) model for steel pipelines subjected to sinusoidal loading using a modified exponential function. The modification in the exponential function is made for the non-dimensional parameter using the stress intensity range (ΔK) as the crack driving force. The acceptable values of ΔK for FCGR in stage-I ranged between 17.45-20.46 MPa√m, between 20.46-21.41 MPa√m for stage-II, and between 21.41-21.98 MPa√m for stage-III. A new correlation is also developed between the specific growth rate and the non-dimensional number. The modified exponential function predicted the FCGR within the acceptable values for all three stages in the radial direction. It shows the best performance for stage-I of FCGR and the lowest for stage-III. The microstructure envisages shallowed microvoids, while the striations and secondary cracks are mostly perpendicular to the FCG direction.

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