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

262

4

Fig. 3. Change in the structure of the foamed material with changes in the content of nanocomponents and the strength of the magnetic field. (a) traditional technology, (b) content of nanocomponents 0.1%, magnetic field strength 1mT, (c) content of nanocomponents 0.2%, magnetic field strength 1mT, (d) content of nanocomponents 0.2%, magnetic field strength 2mT. A stable change in the structure of the material changes qualitatively with a certain saturation of the material with nanocomponents during the foaming process. At the same time, conditionally spherical closed pores turn into discontinuous elongated structures (Fig. 4). This fact is due to a change in the surface strength of the material during the foaming process, which is realized in internal gaps and the union of spherical cavities.

Fig. 4. Changes in the structure of porous material when the content of magnetic nanocomponents exceeds the critical level.

Qualitative changes in the structure significantly affect the strength indicators of materials. The initial gradual decrease in the size of the cavities and the increase in the uniformity of their arrangement leads to an increase in the strength of the materials. Moreover, the content of nanocomponents of 0.2-0.3% at a magnetic field stress of 1-2mT increases the strength by 2-3 times. A change in the structure of the material when cavities are combined and their transformation into open structures leads to a sharp drop in strength. A further change in the content of nanocomponents does not significantly affect the strength indicators. The change in breaking loads depending on the content of nanocomponents and magnetic field strength is shown in Fig. 5. Additional content of nanomagnetic components above 0.35-0.4% does not significantly affect strength indicators. It should be noted that the strength of the magnetic field has a significant effect on the strength indicators, although the nanomagnetic components themselves increase the value of ultimate strength by 1.5-1.7 times.