PSI - Issue 81

Ivan Pidgurskyi et al. / Procedia Structural Integrity 81 (2026) 47–53

53

Conclusions Considering the current computational schemes for merging adjacent semi-elliptical surface cracks adopted in the ASME, BS 7910, and FITNET standards, the obtained relationships (1) and (2), which characterize the variation of the interaction factors γ С and γ A as cracks approach each other under cyclic loading, provide additional insight into crack interaction behavior. These relationships make it possible to refine the assessment of the residual life of structural components in the presence of two identical coplanar surface cracks during their propagation. References ANSYS, Inc., 2022. ANSYS Mechanical User’s Guide, Version 22 R1. ANSYS Inc. Ariatedja, J.B., Mamat, O.A., 2011. Semi-elliptical crack modeling and fracture constraint on failure diagram. Journal of Applied Sciences 11(11), 2006 – 2011. https://doi.org/10.3923/jas.2011.2006.2011 Azuma, K., Li, Y., 2017. Interaction factors for two elliptical embedded cracks with a wide range of aspect ratios. AIMS Materials Science 4(2), 328 – 339. https://doi.org/10.3934/matersci.2017.2.328 Brighenti, R., Carpinteri, A., 2013. Surface cracks in fatigued structural components: a review. Fatigue & Fracture of Engineering Materials & Structures 36, 1209 – 1222. https://doi.org/10.1111/ffe.12100 Duarte, C.A., 2015. Recent developments in the generalized finite element method for the simulation of 3-D hydraulic fracture propagation and interactions. Presented at Department of Civil and Materials Engineering, University of Illinois at Chicago, p. 45. Kikuchi, M., 2016. Study on multiple surface crack growth and coalescence behaviors. AIMS Materials Science 3(4), 1623 – 1631. https://doi.org/10.3934/matersci.2016.4.1623 Lu, K., Li, Y., 2017. Fatigue crack growth calculations for two adjacent surface cracks using combination rules in fitness-for-service codes. AIMS Materials Science 4(2), 439 – 451. https://doi.org/10.3934/matersci.2017.2.439 Patel, S.K., Dattaguru, B., Ramachandra, K., 2010. Multiple interacting and coalescing semi-elliptical surface cracks in fatigue: Part 1: FEA. Structural Longevity 3(1), 37 – 57. https://doi.org/10.3970/sl.2010.003.037 Pidgurskyi, I., 2018. Analysis of stress intensity factors obtained with the FEM for surface semi-elliptical cracks in the zones of structural stress concentrators. Scientific Journal of TNTU 90(2), 92 – 104. https://doi.org/10.33108/visnyk_tntu2018.02.092 Pidgurskyi, M., Stashkiv, M., Pidgurskyi, I., 2025. Stress redistribution and failure of mobile machines frame during propagation of crack-like defects. Engineering Failure Analysis 170, 109217. https://doi.org/10.1016/j.engfailanal.2024.109217 Pidgurskyi, I., Pidgurskyi, M., Yasniy, P., Baranovskyi, V., Shelestovskyi, B., Stashkiv, M., 2022. Mathematical model for estimating SIF K I during coalescence of two identical surface cracks. Procedia Structural Integrity 36, 171 – 176. https://doi.org/10.1016/j.prostr.2022.01.020 Pang, J.H.L., Hoh, H.J., Tsang, K.S., Low, J., Kong, S.C., Yuan, W.G., 2017. Fatigue crack propagation analysis for multiple weld toe cracks in cut-out fatigue test specimens from a girth welded pipe. International Journal of Fatigue 94(1), 158 – 165. https://doi.org/10.1016/j.ijfatigue.2016.09.011 Wen, J.F., Zhan, Y., Tu, S.T., Xuan, F.Z., 2016. A combination rule for multiple surface cracks based on fatigue crack growth life. AIMS Materials Science 3(4), 1649 – 1664. https://doi.org/10.3934/matersci.2016.4.1649 Yasniy, O., Pyndus, Yu., Iasnii, V., Lapusta, Y., 2017. Residual lifetime assessment of thermal power plant superheater header. Engineering Failure Analysis 82, 390 – 403. https://doi.org/10.1016/j.engfailanal.2017.07.028 Yasniy, O., Pyndus, Yu., Brevus, V., Iasnii, V., Lapusta, Y., 2016. Lifetime estimation of superheater header. Procedia Structural Integrity 2, 840 – 846. https://doi.org/10.1016/j.prostr.2016.06.108