PSI - Issue 23

M.R. Tyutin et al. / Procedia Structural Integrity 23 (2019) 559–564 M.R.Tyutin , L.R.Botvina, V.P.Levin and I.O.Sinev/ Structural Integrity Procedia 00 (2019) 000 – 000

564

6

caused by the dislocation motion. Thus, the 4 stages of damage changes that are noted earlier (Zharkova, Botvina, and Tyutin 2007) are evident due to the dislocations movement at the beginning of the plastic flow, the appearance of microcracks, their coalescence and the formation of fracture localization zone and macrocrack. The transition from one stage to another causes changes in the parameters of acoustic emission, as well as in the self-magnetic field intensity. A study of the staging of the fracture of austenitic stainless steel by acoustic emission method was also carried out by (Bashkov et.al. 2010), where it was shown that each type of defect (dislocation, micro- and macrocrack) corresponds to a certain AE signals spectrum, analyzing which authors identified fracture stages. Unfortunately, the lack of damage evolution data in specified article makes it difficult to compare the results obtained by Bashkov and the results of this study. A direct correlation of coercive force values with damage, not previously noted in the literature, is established. The study shows that the change in the in eddy current parameter with damage significantly differs in two studied steels. This is probably due to the deformation induced martensite transformation in austenitic steel. It is shown that changes in the rate of accumulation of microcracks in low-carbon steel at tension obey the Kachanov-Rabotnov equation.

Acknowledgements The study was supported by the Russian Science Foundation (project №1 9-19-00674).

References

Bashkov, O.V., S.V. Panin, and T.I. Bashkova. 2010. The study and Identification of the mechanisms of Deformation and fracture of 12KH18N10T Steel using the Acoustic Emission Method. Scientific Notes of Komsomolsk-On-Amur State Technical University 1 (2): 145 – 154 (in Russian). Botvina L.R., T.B. Petersen, A.P. Soldatenkov, and M.R. Tyutin. 2015. Time Dependences of Acoustic Signal Characteristics during Fracture of Metal Samples. Doklady Earth Sciences 462 (1): 475 – 478 (in Russian). Botvina L.R., A.P. Soldatenkov, V.P. Levin, M.R. Tyutin, Yu.A. Demina, T.B. Petersen, A.A. Dubov, and N.A. Semashko. 2016. Assessment of Mild Steel Damage Characteristics by Physical Methods. Russian Metallurgy (Metally) 2016 (1): 23 – 33. Botvina L.R., A.P. Soldatenkov, M.R. Tyutin, Y.A. Demina, V.P. Levin, and T.B. Petersen. 2017. On Interrelation of Damage Accumulation in Structural Steels and Physical Parameters Estimated by Methods of Acoustic Emission and Metal Magnetic Memory. Russian Metallurgy (Metally) 2017 (1): 10-17. Botvina L.R., T.B. Petersen, N.A. Zharkova, M.R. Tyutin, and V.G. Budueva. 2005. Acoustic Properties of Low-Carbon Steel at Different Stages of Fracture. Deformation and Fracture (Deformatsiya I Razrushenie Materialov), no. 4: 35 – 41. Botvina L.R., N.A. Zharkova, M.R. Tyutin, A.P. Soldatenkov, Yu.A. Demina, and V.P. Levin. 2013. Development of plastic zones and damage under different types of loading. Industrial Laboratory (Zavodskaia Laboratoriia. Diagnostika Materialov) 79 (5): 46 – 55 (in Russian). Botvina L.R. and T.B. Petersen. 2001. On the Analogy of Acoustic and Seismic Regimes At Different Stages of Destruction. Doklady of Russian Academy of sciences. 376: 331 (in Russian). Carpinteri Alberto, Giuseppe Lacidogna, and Simone Puzzi. 2009. Chaos, Solitons and Fractals From Criticality to Final Collapse: Evolution of the ‘‘b - Value” from 1.5 to 1.0 . Chaos, Solitons and Fractals 41 (2): 843 – 853. Dubov A.A., A.A. Dubov, and S.M. Kolokol`nikov. 2012. Metal Magnetic Memory method and control devices. Textbook. 5th ed. Moscow: «Spectr» .394 (in Russian). Kachanov L.M.. 1974. Fundamentals Of Fracture Mechanics. Moscow: Nauka. 142 (in Russian). Krasovskii`, A.Ya, N.V. Novikov, and G.M. Nadezhdin. 1976. Correlation Between Acoustic Emission, Plastic flow and Fracture in Iron In Static Loading over a Wide range of Temperatures and Deformation rates. Strength of Materials (Problemy` prochnosti), no. 10: 3 – 11 (in Russian). Rabotnov Yu.N.. 1966. The Creep Of Structural Elements. Moscow: Nauka. 752 (in Russian). Shiotani T., J. Bisschop, and J. G.M. Van Mier. 2003. Temporal and Spatial Development of Drying Shrinkage Cracking in Cement-Based Materials. Engineering Fracture Mechanics 70 (12): 1509 – 1525. Zharkova, N.A., L.R. Botvina and M.R. Tyutin. 2007. Damage accumulation stages in a low-carbon steel during uniaxial tension. Russian Metallurgy (Metally) 2007 (3): 223-229.