PSI - Issue 40

V. Kibitkin et al. / Procedia Structural Integrity 40 (2022) 223–230

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V. Kibitkin et al/ Structural Integrity Procedia 00 (2022) 000 – 000

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Fig. 8. Dependence of the variance of displacements of the deformation vectors on time

6. Conclusion It was revealed that three stages are responsible for different mechanisms that ensure the resistance of porous, segmented alumina to fracture under compressive loading: the first stage is the formation of the first crack, followed by the second stage, accompanied by the appearance of numerous macro-bands. And, finally, the third stage, when with an increase in deformation, a gradual decrease in the level of localization of deformation occurs due to the formation of compaction bands throughout the volume of the material, due to the filling of the space between the segments and the pore space of large pores with fragments of collapsed material. The evolution of the variance of the displacements of the deformation vectors indicates that at certain points in time the deformation significantly differs from the average and has an unstable character. In this case, the average amplitudes of the displacements of the deformation vectors are approximately an order of magnitude less than the displacements of the vectors. Acknowledgements The research was funded by RFBR and Tomsk region, project number 18-48-700056. References Sutton, M. A., Orteu, J. J., Schreier, H. 2009. Image correlation for shape, motion and deformation measurements: Basic concepts, theory and applications. New York: Springer, 332 p. Kibitkin, V., Solodushkin, A., Pleshanov, V., Napryushkin, A. 2017. On a choice of input parameters for calculation the vector field and deformation with DIC. Measurement 95, 266  272. Chen, Y., Wang, N., Ola, O., Xia, Y., Zhu, Y. 2021. Porous ceramics: Light in weight but heavy in energy and environment technologies. Materials Science and Engineering: R: Reports 143, 100589. Carlesso, M., Giacomelli, R., Krause, T., Molotnikov, A., Koch, D., Kroll, S., Tushtev, K., Estrin, Y., Rezwan, K. 2013. Improvement of sound absorption and flexural compliance of porous alumina-mullite ceramics by engineering the microstructure and segmentation into topologically interlocked blocks. Journal of the European Ceramic Society 33, 2549 – 2558. Kibitkin, V., Grigoriev, M., Burlachenko, A., Solodushkin, A., Savchenko, N., Rubtsov V., Tarasov, S. 2021. In Situ Investigation of Strain Localization in Sintered, Porous Segmented Aluminа. Materials 14, 3720 .