Issue 49

A. Vedernikova et alii, Frattura ed Integrità Strutturale, 49 (2019) 314-320; DOI: 10.3221/IGF-ESIS.49.31 319 method was found to be efficient for estimating the accumulated energy in the titanium alloy Grade 2. It was established that conduction is the predominant heat transfer mechanism for the examined material. The value of stored energy reaches a critical value and stored energy rate tends towards zero at the end of deformation process. This indicates that most of the plastic work is converted into heat, and the material is close to being fractured. Hence, it can be concluded that the analysis of the energy stored in the material can provide an adequate description of damage evolution in metals under deformation. a) b) Figure 5 : (a) The different contributions of conduction, convection and radiation to the total energy dissipation; (b) Time dependence of heat dissipation and stored energy (Eqn. 5). A CKNOWLEDGMENTS his work was supported by the grants RFBR №18-31-00293 and №16-51-48003. R EFERENCES [1] Rosakis, P., Rosakis, A.J., Ravichandran, G., Hodowany J. (2000). A thermodynamic internal variable model for the partition of plastic work into heat and stored energy in metals, J. Mech. Phys. Solids, 48, pp. 581-607. [2] La Rosa, G., Risitano, A. (2000). Thermographic methodology for rapid determination of the fatigue limit of materials and mechanical components, // Int. J. Fatigue, 22, pp. 65–73. DOI: 10.1016/S0142-1123(99)00088-2. [3] Oliferuk, W., Maj, M., Raniecki B. (2004). Experimental analysis of energy storage rate components during tensile deformation of polycrystals, Mater. Sci. Eng., 374, pp. 77-81. DOI: 10.1016/j.msea.2003.12.056. [4] Benaarbiaa, A., Chrysochoos, A., Gilles R. (2014). Kinetics of stored and dissipated energies [5] Risitano A., Risitano G. (2010). Cumulative damage evaluation of steel using infrared thermography, Theor. Appl. Fract. Mec., 54(2), pp. 82-90. DOI: 10.1016/j.tafmec.2010.10.002. [6] Plekhov, O.A., Saintier, N., Naimark, О.B. (2007). Experimental study of energy accumulation and dissipation in iron in an elastic-plastic transition, Tech. Phys. Lett., 52(9), pp. 1236-1238. DOI: 10.1134/S106378420709023X. [7] Fedorova, A., Bannikov, M., Terekhina, A., Plekhov, O. (2014). Heat dissipation energy under fatigue based on infrared data processing, Quant Infrared Thermogr J., 11(1), pp. 2-9. DOI: 10.1080/17686733.2013.852416. [8] Iziumova, A.Yu., Vshivkov, A.N., Prokhorov, A.E., Plekhov, O.A., Venkatraman, B. (2016). Study of heat source evolution during elastic-plastic deformation of titanium alloy Ti-0.8Al-0.8Mn based on contact and non-contact measurements, PNRPU Mechanics Bulletin, 1, pp. 68–81. DOI: 10.15593/perm.mech/2016.1.05. [9] Iziumova, A.Yu., Plekhov, O.A., Vshivkov, A.N., Prokhorov, A.A., Uvarov, S.V. (2014). Studying the Rate of Heat T