PSI - Issue 33

Tatyana Tretyakova et al. / Procedia Structural Integrity 33 (2021) 1013–1018 Author name / Structural Integrity Procedia 00 (2019) 000–000

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4. Summary Thus, in the work the techniques for implementing a controlled complex stress state, implemented in uniaxial tensile tests (without the use of specialized equipment and biaxial loading systems), were worked out and tested. It is noted that an increase in the sharpness of the annular concentrator, and, consequently, an increase in the degree of stress concentration, leads to an increase in the bearing capacity of the samples (maximum perceived load), but deformation reserves decrease (maximum deformation at the time of failure), and also affects the manifestation of the Portevin-Le Chatelier effect. Acknowledgements This work was carried out by using the capabilities of a large unique scientific facility (UNU) ‘A set of test and diagnostic equipment for studying the properties of structural and functional materials under complex thermomechanical influences’, which is part of the Center of Experimental Mechanics, PNRPU (Perm, Russia). The work was supported by Grants Council of the President of the Russian Federation (No. МК-885.2020.1). References Vildeman V.E., Lomakin E.V., Tretyakova T.V., Tretyakov M.P., 2017. Supercritical deformation and fracture of bodies with concentrators under plane stress state conditions. Mechanics of Solids, 52 (5) 488–494. Tretyakov M.P., Lomakin E.V., Vildemann V.E., 2016. Failure of materials on the postcritical deformation stage at different types of the stress strain state. Procedia Structural Integrity, Vol.2, 3721-3726. 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), 303-314. Tretyakova, T.V., Wildemann, V.E., Tretyakov, M.P., 2019. Investigation of the Portevin-Le Chatelier effect in metals under additional vibration impact by using the DIC-technique and the IR-analysis. Procedia Structural Integrity 18, 837-842. Bazant Z.P., Lusio G.D., 2004. Nonlocal microplane model with strain-softening yield limits// International Journal of Solids and Structures, 41, 7209–7240.