PSI - Issue 13

Tatyana Tretyakova et al. / Procedia Structural Integrity 13 (2018) 1739–1744 Author name / Structural Integrity Procedia 00 (2018) 000–000

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Table 2. Results for uniaxial tension test with additional vibration impact (Al-Mg alloy specimen) Parameters LB PLC1 PLC2 PLC3 PLC4 PLC5 Band velocity, mm/min 5.45 9.75 8.89 5.54 - - Duration AE signals, µs 187209 114487 73180 55900 108816 88582 AE Activity, counts 49210 34271 7011 6752 11119 11265 Energy, V 2 s 4.08∙10 -9 1.92∙10 -9 4.06∙10 -10 3.53∙10 -10 6.46∙10 -10 5.78∙10 -10

Conclusions Experimental data were obtained (diagrams, evolution of strain fields and local deformation rates, temperature fields, AE parameters) characterizing the material behavior and irregularities of the plastic flow due to the Chernov Lüders deformation and Portevin-Le Chatelier effect in metals. It was revealed that additional vibration impact during uniaxial tension tests influence on kinetics of the Chernov-Lüders and the Portevin-Le Chatelier bands. The vibration decrease the intensity of AE-parameters such as the duration of AE signals, activity and energy as well. It is revealed the influence on the quasi-periodic character of the plastic flow. The initiation and propagation of the strain bands become nonuniform and random. Acknowledgements The study was carried out in the Center of Experimental Mechanics of Perm National Research Polytechnic University and funded by RFBR and Perm krai according to the research project № 17-48-590158, № 18-31-00452. References Wang, X.G., Wang, L., Huang, M.X., 2017. Kinematic and thermal characteristics of Lüders and Portevin-Le Chatelier bands in a medium Mn transformation-induced plasticity steel. Acta Materialia 124, 17-29. Illkova, K., Dobron, P., Chmelík, F., Kainer, K.U., Balík, J., Yi, S., Letzig, D., Bohlen J., 2014. Effect of aluminium and calcium on the microstructure, texture, plastic deformation and related acoustic emission of extruded magnesium–manganese alloys. Journal of Alloys and Compounds 617, 253–264. Tretyakova, T.V., Wildemann, V.E., 2017. Influence the loading conditions and the stress concentrators on the spatial-time inhomogeneity due to the yield delay and the jerky flow: study by using the digital image correlation and the infrared analysis. Frattura ed Integrita Strutturale 11 (42), 314-325. Tretyakova, T.V., Wildemann, V.E., 2017. Study of the spatial-time inhomogeneity of inelastic deformation and failure in bodies with concentrators by using the digital image correlation and infrared analysis. Procedia Structural Integrity 5C, 318-324.