Issue 78

D. S. Lobanov et alii, Fracture and Structural Integrity, 78 (2026) 207-219; DOI: 10.3221/IGF-ESIS.78.12

However, the scope of application of the obtained results is limited. The data were obtained for STEF material with a fixed reinforcement pattern; their extension to other types of polymer composites and layup structures requires additional experimental verification. Tests were conducted only under uniaxial compression conditions; the behavior of the material with the studied defect types under complex stress conditions remains unexplored. Promising areas for further research include: the development and validation of numerical models based on the finite element method for predicting the residual strength of damaged elements, verified using acoustic emission data; study of the scale factor - transition to testing samples and structural elements of increased dimensions, close to the conditions of actual operation. A CKNOWLEDGEMENTS he study was conducted at Perm National Polytechnic University with financial support from the Russian Science Foundation Grant No. 25-29-00188, https://rscf.ru/project/25-29-00188/ . R EFERENCES [1] Skytta, V., Saarela, O., Wallin, M. (2006). Progressive failure of composite laminates; analysis vs experiments. In: Gdoutos, E.E. (eds) Fracture of Nano and Engineering Materials and Structures. Springer, Dordrecht. DOI: https://doi.org/10.1007/1-4020-4972-2_168. [2] Zou, X., Gao, W., Xi, W. (2024). Influence of various damage mechanisms on the low-velocity impact response of composite laminates, Polymer Composites, 45 (1), pp. 722-737. [3] Dhanisetty, V.S.V., Massart, P.F.R., Esrail, F., Verhagen, W., Kassapoglou, C., Curran, R. (2019). Prediction of damage due to impact for composites on the basis of possible impact threats, International Journal of Impact Engineering, 132, 103317. DOI: https://doi.org/10.1016/j.ijimpeng.2019.103317. [4] Larrosa, C., Lonkar, K., Chang, F.-K. (2014). In situ damage classification for composite laminates using gaussian discriminant analysis, Structural Health Monitoring, 13 (2), pp. 190-204. [5] Rafiee, M., Fallah, A., Hosseini Rad, S., Labrosse, M.R. (2025). Compression, impact and residual strength after impact properties of graphene/fiberglass/epoxy multiscale composites, Composites Communications, 53, 102254. DOI: https://doi.org/10.1016/j.coco.2025.102254. [6] Talreja, R. (2014). Assessment of the fundamentals of failure theories for composite materials. Composites Science and Technology, 105, pp. 190-201. DOI: https://doi.org/10.1016/j.compscitech.2014.10.014. [7] Ihn, J.-B., Chang, F.-K. (2004). Detection and monitoring of hidden fatigue crack growth using a built-in piezoelectric sensor/actuator network: I. diagnostics, Smart Materials and Structures, 13 (3), p. 609. [8] Liu, H., Liu, S., Liu, Z., Mrad, N., Milani, A.S. (2021). Data-driven approaches for characterization of delamination damage in composite materials, IEEE Transactions on Industrial Electronics, 68 (3), pp. 2532-2542. DOI: https://doi.org/10.1109/tie.2020.2973877. [9] Bryansky, A.A., Bashkov, O.V., Belova, I.V., Bashkova, T.I. (2022). Investigation of damages formed in polymer composite materials under bending loading and their identification by the acoustic emission technique, Frontier Materials & Technologies, (2), pp. 7-16. DOI: https://doi.org/10.18323/2782-4039-2022-2-7-16. [10] Fan Dong, Yazhi Li, Biao Li. (2026). A new damage model for real-time lifetime prediction of composite laminates based on acoustic emission monitoring, International Journal of Fatigue, 203, 109284. DOI: https://doi.org/10.1016/j.ijfatigue.2025.109284. [11] Rubio-González, C., de Urquijo-Ventura, M. del P., Rodríguez-González, J.A. (2023). Damage progression monitoring using self-sensing capability and acoustic emission on glass fiber / epoxy composites and damage classification through principal component analysis, Composites Part B: Engineering, 254, p. 110608. DOI: https://doi.org/10.1016/j.compositesb.2023.110608. [12] Inturi, V., Hemanth, M.P., Penumakala, P.K., Sabareesh, G.R. (2022). Damage monitoring of pultruded GFRP composites using wavelet transform of vibration signals, Measurement, 195, 111177. DOI: https://doi.org/10.1016/j.measurement.2022.111177. [13] Chaudhry, M.S., Czekanski, A., Yan, N. (2023). Compressive behaviour of GFRP laminates with surface damage. Mechanics of Composite Materials, 59(1), pp. 145-158. DOI: https://doi.org/10.1007/s11029-023-10080-9. T

218