The distribution of local stresses and strains in a specimen in the vicinity of the crack tip in 50G and 32G2 casing pipe steels with different microstructure is obtained by simulating the stress-strain state at the crack tip and using numerical calculations. Steels are distinguished by atypical mechanical behavior: lower-strength 50G steel with a coarse-grained ferrite-pearlite structure is characterized by lower resistance to brittle fracture compared to 32G2 steel with a fine-grained bainite structure. The finite element method is used to simulate the specimen with a crack, and for calculations the true stress-strain curves of the steels are used. The calculation results confirm a higher susceptibility of the coarsegrained steel to crack propagation by brittle fracture.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 58, No. 4, pp. 32–36, July–August, 2022
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Zvirko, O.I., Lipec, S., Vengreniuk, O.I. et al. Evaluation of the Stress-Strain State at the Crack Tip in Casing Pipes Based on Numerical Simulation. Mater Sci 58, 460–465 (2023). https://doi.org/10.1007/s11003-023-00685-3
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DOI: https://doi.org/10.1007/s11003-023-00685-3