PSI - Issue 30

L.A. Prokopyev et al. / Procedia Structural Integrity 30 (2020) 120–127

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Prokopyev L.A. et al. / Structural Integrity Procedia 00 (2020) 000–000

consideration of T-stresses as the reason for the differences in the coefficients of the power dependence of the parameters of acoustic signals for the same values of the SIF. 5. Conclusions Using the finite element method, which combines thermal and structural analyzes, the dependence of the crack tip plastic zone size on the stress intensity factor and T-stresses was determined. According to the research results, the assumptions that the T-stress influence to the plastic zone size are qualitatively confirmed. It is shown, that the negative values of T-stresses decrease the plastic zone size for a same value of the stress intensity factor. The results of this work make it possible to further determine the coefficients of the power-law dependence of the stress intensity factor on the plastic zone volume, which is necessary to establish a correlation between acoustic signals and the fracture mechanics parameters. Acknowledgements The reported study was funded by Ministry of Science and Education of Russian Federation, Project III.28.1.1 in the frames of Program for Basic Research of the Siberian Branch of Russian Academy of Sciences. References Andreyev Ya., Bol'shakov A., 2018. Method for low-temperature local loading of the bottom of vertical steel tanks with acoustic emission method of non-destructive testing. Patent 2653593 Rus. Fed., Larionov Institute of the Physical-Technical Problems of the North SB RAS, May. 2018. Bol'shakov A., Andreyev Ya, 2017. Method of low-temperature local loading of an object with acoustic-emission method of non-destructive testing. Patent 2614190 Rus. Fed., Larionov Institute of the Physical-Technical Problems of the North SB RAS, March. 2017. Bol'shakov A., Prokop'yev L., 2016, Influence of stress distribution on the plasticity zone at the tip of a normal separation crack with allowance for T-stresses, Russian metallurgy (Metally) 7, 11–14. Buylo S., 2017. Physicomechanical, statistical and chemical aspects of acoustic emission diagnostics: monography, Southern Federal University Publishing House, 184. Fett, T., 1996, Stress intensity factors, T-stress and weight functions for double-edge-cracked plates. Forschungszentrum Karlsruhe, FZKA 5838. Jolly M., 2015, Review of Non-destructive Testing (NDT) Techniques and their Applicability to Thick Walled Composites, Procedia CIRP 38, 129-136. Matvienko Yu., 2011. The non-singular T-stresses in fracture mechanics criteria of solids with notches. Vestnik Nijegorodskogo universiteta N.I.Lobachevskogo 4, 2651-2652. Meliani H., Matvienko Yu., Pluvinage G, 2011. International Journal of Fracture 167, 173-182.

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