Issue 50

O. Plekhov et alii, Frattura ed Integrità Strutturale, 50 (2019) 1-8; DOI: 10.3221/IGF-ESIS.50.01 1 Focused on New Trends in Fatigue and Fracture The effect of fatigue crack rate on the heat dissipation in metals under mixed-mode loading Oleg Plekhov Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm, Russia poa@icmm.ru Aleksei Vshivkov Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm, Russia vshivkov.a@icmm.ru A BSTRACT . The study of energy balance at crack tip could give comprehensive information for estimation of durability and reliability cracked construction under cyclic loading. The first step for estimation energy balance is monitoring of dissipated part of energy (heat generation). One of the most effective techniques for investigation of temperature evolution on the surface of deformed body is infrared thermography. The work is devoted to the experimental study of energy dissipation in cracked samples made of titanium Grade 2 under multiaxial cyclic loading. To explain the experimentally obtained correlation between fatigue crack rate and power of heat dissipation we developed a phenomenological model describing the evolution of plastic work at the crack tip under arbitrary loading. The theoretical and experimental data about heat dissipation exhibit a good quantitative agreement. K EYWORDS . Energy dissipation; Crack propagation; Infrared thermography; Mixed-mode loading. Citation: Plekhov, O., Vshivkov, A., The effect of fatigue crack rate on the heat dissipation in metals under mix mode loading, Frattura ed Integrità Strutturale, 50 (2019) 1-8. Received: 26.12.2018 Accepted: 08.07.2019 Published: 01.10.2019 Copyright: © 2019 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION he most frequently used technique for estimation of lifetime of cracked samples is based on the correlation between stress intensity factor and fatigue crack rate (Paris` law). Paris law is results treatment of many experimental data in framework of elastic solution of crack propagation problem. As a consequence, this law doesn`t explain the physical nature of the process of crack propagation in metals and initiates a lot of scientific discussions and attempts to derive alternative description of crack propagation law. Such alternative laws of crack propagation were proposed by many authors based on correlations of the fatigue crack growth rate and mechanical-structural parameters describing the failure process at crack tip. For instance, the intensity of plastic T