PSI - Issue 59

Mykola Riabchykov et al. / Procedia Structural Integrity 59 (2024) 259–264 Mykola Riabchykov et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 5. Change in strength when changing the content of nanocomponents and magnetic field stress: (1) - 0, (2) - 1mT, (3) - 2mT.

4. Conclusion The magnetic technology of manufacturing porous materials with the content of nanocomponents of a mixture of divalent and trivalent iron significantly affects the structural and mechanical characteristics of these materials. This technology includes the mixing of isocyanate, polyol, blowing agent and magnet powder in conditions of the magnetic field with a capacity of 1-2 mT. Increasing the content of nanocomponents, as well as increasing the magnetic field strength, significantly improves the structure of the porous material. The average size of the cavities increases, and the variance of the dispersion of sizes decreases. Changing the structure of porous materials has a positive effect on strength. Increasing the content of magnetic nanomaterials to 0.2-0.3% in the process of creation of porous material in conditions of a magnetic field of 1.5-2 mT increases the strength indicators by 2-3 times. The effect of a qualitative change in the structure was revealed when the content of magnetic nanocomponents increased by more than 0.3-0.35%. The conditional spherical shape of the cavities of the porous material is changed to an open one by combining individual cavities. At the same time, the strength of the material decreases sharply. With a further increase in the content of nanocomponents, the strength does not change significantly. Thus, the conditions of the maximum strength of the porous material correspond to the value of the content of magnetic nanocomponents of 0.3% in the conditions of a magnetic field of 2 mT. References Ascione, F., De Maio, U., Greco, F., Lonetti, P., Sgambitterra, G., Pranno, A., 2023. Failure analysis of RC structures retrofitted with nano enhanced FRP systems. Procedia Structural Integrity 47, 460-468. https://doi.org/10.1016/j.prostr.2023.07.078 Bridjesh, P., Geetha, N.K., Reddy, G.C.M., 2023. On Numerical Investigation of Buckling in Two-Directional Porous Functionally Graded Beam Using Higher Order Shear Deformation Theory. Mechanics Of Advanced Composite Structures 10(2), 393-406. https://doi.org/10.22075/macs.2023.29340.1462 Davino, D., D’Auria, M. , Pantani, R., Sorrentino, L., 2021. Reinforced Smart Foams Produced with Time-Profiled Magnetic Fields. Polymers 13, 24. https://doi.org/10.3390/polym13010024 Han, S., Yang, X., Hu, X., Wang, Y., Wu, F., 2023. Optimal design of energy-saving foam with multifunctional characteristics: Superb flame retardancy, outstanding hydrophobic, excellent thermal insulation and robust mechanical performances. Polymer Degradation and Stability 217, 110518. https://doi.org/10.1016/j.polymdegradstab.2023.110518 Ibadat, N.F., Ongkudon, C.M., Saallah, S., Misson, M., 2021. Synthesis and Characterization of Polymeric Microspheres Template for a Homogeneous and Porous Monolith. Polymers 13, 3639. ttps://doi.org/10.3390/polym1321363 Jiang, L.Y., Schmid, F., Nassr, M., Fadavian, H., Mostaan, M.A., Semirumi, D.T., 2023. Fabrication of porous polymeric-based scaffold for dental tissue repair in fracture healing: RVE simulation and ANN optimization, Materials Science and Engineering: B, Vol.297, 116770, https://doi.org/10.1016/j.mseb.2023.116770