PSI - Issue 47

L.A. Almazova et al. / Procedia Structural Integrity 47 (2023) 417–425 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

423

7

Fig. 1. Stress distribution in the vicinity of pits: (a) the maximum stresses are at the bottom of the pits; (b) the maximum stresses are at the edges between the pits

4. Conclusion Two growing corrosion pits on the surface of a spherical pressure vessel are considered, when the rate of their growth is supposed to be linearly dependent on the maximum principal stress at their bottom. The effect of different geometrical parameters, including distance between the defects, on the maximum stresses and the pit growth rate is analysed. For the considered parameters, the growth rate of a certain pit is not significantly affected by the presence of the second pitting, even when the distance between them does not exceed their radii. The depth of pits has hardly noticeable effect on the maximum stresses and the growth rate. A decrease in the radii of the vessel, its thickness being fixed, leads to a reduction in the maximum stresses at the bottom of the pits; the growth rate of the pits also slightly decreases with decreasing radii of the vessel. The distance between the pits affects the stress distribution around the pits: for relatively large distances, pits do not influence each other and the maximum stress is reached at the bottom of the pits, while as the distance decreases, the interaction between pits begins to appear and the maximum stresses are observed at the edge between the pits. Acknowledgements This research was supported by the Russian Science Foundation, grant No 21-19-00100, https://rscf.ru/project/21 19-00100/.

References

Abakarov, A., Pronina, Y., 2022. Environmentally Assisted Growth of Multiple Cracks Grouped in Stacked Configurations. Procedia Structural Integrity 42, 1046-1053 doi: 10.1016/j.prostr.2022.12.132 Abakarov, A., Pronina, Y., Kachanov, M., 2022. Symmetric Arrangements of Cracks with Perturbed Symmetry: Extremal Properties of Perturbed Configurations. International Journal of Engineering Science 171(4), 103617. DOI: 10.1016/j.ijengsci.2021.103617 Ahmed, A.B., Houria, M.I., Fathallah, R., and Sidhom, H. (2019). The effect of interacting defects on the HCF behavior of Al-Si-Mg aluminum alloys, J. Alloy. Compd., 779, pp. 618–629. DOI: 10.1016/j.jallcom.2018.11.282. Anguiano, M., Masud, A., Rajagopal, K. R., 2022. Mixture Model for Thermo-Chemo-Mechanical Processes in Fluid-Infused Solids. International Journal of Engineering Science 174. 103576. doi: 10.1016/j.ijengsci.2021.103576