PSI - Issue 28

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 1839–1845

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract The experimental study of heat flux evolution at the fatigue crack tip during uniaxial and biaxial loading was carried out. The plane samples of Grade 2 titanium alloy were weakened by notch to initiate fatigue crack. A contact heat flux sensor based on the Seebeck effect was used for monitoring of the dissipated energy. During the tests, the samples were subjected to cyclic loading with constant stress amplitudes and different biaxial parameter. Based on the analytical estimation of heat dissipation at the crack tip we proposed an approximation of heat dissipation as a function of crack growth rate. The approximation is universal for all considered loading types (uniaxial and biaxial). A linear correlation between crack growth rate and heat dissipation was obtained. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Fatigue crack, mixed mode loading, dissipated energy, heat flux. 1. Introduction Development of new structural materials and their treatment under various conditions require new effective methods for estimation of durability and strength of structures. In this paper, methodology for a complex assessment of the material under fatigue loading is developed. In this work, we assume that propagation of a fatigue crack is fully determined by evolution of energy balance at the crack tip. It enables to develop a new theoretical approach of crack mechanics and propose new methods of fatigue crack monitoring. Nowadays, non-destructive testing methods are widely used by various scientific groups such as Matvienko et al. (2004), Rosakis et al. (2000), Oliferuk et al. 1st Virtual European Conference on Fracture Experimental investigation of fatigue crack induced energy dissipation under mixed mode loading A. Vshivkov*, A. Iziumova, O. Plekhov Institute of Continuous Media Mechanics UB RAS, 614013 Perm, Russian Federation Abstract The experimental study of heat flux evolution at the fatigue crack tip during uniaxial and biaxial loading was carried out. The plan samples of Gra e 2 titanium alloy were weakened by notch to initiate fatigue cr ck. A cont ct heat flux senso based on t Seebeck eff ct was us d for monitoring of the dissipated e ergy. Dur ng the ests, the samples were subjected to cyclic loading with constant stres amplitudes and d fferen biaxial ramet . Based on t e analytical estimation of heat dissipation at the crack tip we proposed an pproximatio of h at dissipation as a function of crack grow h rat . The approximation is universal fo all considered l a ing ty es (uni x al and bi xial). A l near correlati between crack growth rat nd heat dissipation was obtained. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of European Structural Integri y Society (ESIS) ExC K ywords: Fatigue crack, mixed mode loading, dissipated energy, heat flux. 1. Introduction Development of new structural materials and their treatment under various conditions require new effective methods for estimation of durability and strength of struc ures. I his paper, methodology for a complex assessment of e material under fatigue loading is developed. In this work, we assume that propagation of a fatigue crack is fully determ ned by evolution f energy balance at the crack tip. It enables to develop a new the retic l appro h of crack m cha ics and propose new methods of fatigue crack monitori g. Nowa ays, non-destructiv testing methods a e wid ly used by va i us sci ntific gr ups such as M tvienko et al. (2004), Ro akis et al. (2000), Oliferuk et al. 1st Virtual European Conference on Fracture Experimental investigation of fatigue crack induced energy dissipation under mixed mode loading A. Vshivkov*, A. Iziumova, O. Plekhov Institute of Continuous Media Mechanics UB RAS, 614013 Perm, Russian Federation

* Corresponding author. Tel.: +73422378312; fax: +73422378487. E-mail address: vshivkov.a@icmm.ru * Corresponding author. Tel.: +73422378312; fax: +73422378487. E-mail address: vs ivkov.a@icmm.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of t European Structural Integrity So i ty (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.007