PSI - Issue 54

Artur Kuchukov et al. / Procedia Structural Integrity 54 (2024) 369–375 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 6. Photographs of the surfaces of fiberglass samples after preliminary proportional cyclic stretching with torsion (proportional 2) (from left to right: n’=0.078; 0.404; 0.848; 0.509)

Conclusions Experimental dependences of the influence of the ratio of axial and shear components of preliminary biaxial cyclic action on the residual strength and rigidity of fiberglass thin-walled tubular samples were obtained. The sensitivity of the composite under study to a complex stress-strain state was revealed. A significant reduction in fatigue life was observed under biaxial loading compared to uniaxial tension or torsion. The influence of the relationship between the modes of preliminary cyclic loading on the residual mechanical characteristics was discovered. This research was carried out with the support of the Russian Science Foundation (Project No 22-79-00136, https://rscf.ru/en/project/22-79-00136/). Reference 1. Shiri S., Yazdani M., Pourgol-Mohammad M. A fatigue damage accumulation model based on stiffness degradation of composite materials. Materials & Design , 2015, vol. 88, pp. 1290 – 1295. https://doi.org/10.1016/j.matdes.2015.09.114 2. Quan S., Zhang Y., Lin P. Fatigue damage quantitative evaluation of carbon fiber composites at different stress ratios based on nonlinear ultrasonic. Results in Physics , 2023, vol. 51, 106695, ISSN 2211-3797, https://doi.org/10.1016/j.rinp.2023.106695. 3. Wang M., He M., Liang Z., Wu D., Wang Y., Qing X., Wang Y. Fatigue damage monitoring of composite laminates based on acoustic emission and digital image correlation techniques. Composite Structures , 2023, Vol. 321, 117239, ISSN 0263-8223, https://doi.org/10.1016/j.compstruct.2023.117239. 4. Wu Z., Fang G., Fu M., Chen X., Liang J., Lv D. Random fatigue damage accumulation analysis of composite thin-wall structures based on residual stiffness method. Composite structures , 2019, vol. 211, pp. 546-556. doi: 10.1016/j.compstruct.2019.01.018. 5. Carraro P.A, Quaresimin, M. Fatigue damage and stiffness evolution in composite laminates: a damage-based framework, Procedia engineering , 2018, 213, pp. 17 – 24. DOI: 10.1016/j.proeng.2018.02.003. 6. Wil’deman V.E., Staroverov O.A., Lobanov D.S. Diagram and parameters of fatigue sensitivity for evaluating the residual st rength of layered GFRP composites after preliminary cyclic loadings. Mechanics of Composite Materials , 2018, vol. 54, pp. 313 – 320. doi:10.1007/s11029-018 9741-9 7. Wil'deman V.E., Staroverov O.A., Yankin A.S., Mugatarov A.I. Description of fatigue sensitivity curves and transition to critical states of polymer composites by cumulative distribution functions. Frattura ed Integrità Strutturale , 2023, vol. 17. doi: 10.3221/IGF-ESIS.63.09 8. Mao H., Mahadevan S. Fatigue damage modelling of composite materials. Composite structures , 2002, vol. 58, pp. 405 – 410. 9. Weibull W. A statistical distribution function of wide applicability, J. Appl. Mech ., 1951, vol. 18(3), pp. 293 – 297. DOI: 10.1115/1.4010337. 10.Mugatarov A., Staroverov O., Wildemann V. Influence of loading conditions on GFRP fatigue sensitivity curves parameters and transition to critical states. Procedia structural integrity , 2023, vol. 45, pp. 1 – 6 (accepted, not published) 11. Wildemann V., Staroverov O., Strungar E., Mugatarov A., Kuchukov A. Mechanical Properties Degradation of Fiberglass Tubes during Biaxial Proportional Cyclic Loading. Polymers , 2023, vol. 15. doi: 10.3390/polym15092017 Acknowledgement