PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedirect.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 12 9–1214 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity Procedia 00 (2018) 000–000

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XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity The heat dissipation at fatigue crack tip under mix mode loading O. Plekhov a *, A. Vshivkov a , A. Iziumova a , A. Zakharov b , V. Shlyannikov b a Institute of continuous media mechanics of the Ural branch of Russian academy of science, Ac.Koroleva st.,1, Perm, 614013, Russia b Kazan Scientific Center of Russian Academy of Sciences, Lobachevskogo str. 2/31, Kazan, 420111, Russia Abstract The cruciform plane specimens of titanium alloy VT1-0 with a thick of 1 mm were tested to study temperature evolution under fatigue crack propagation. The original contact sensor of heat flow and method of infrared thermography were used to analyze the dissipated energy from crack tip during fatigue tests. A series of experiments was c rried out to study the propagation of a fatigue crack under biaxial loading with different biaxial coefficient. It has been shown that heat dissipation caused by fatigue crack propagation under Paris regime can be divided into two stages both under uniaxial and biaxial loading conditions. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: energy dissipation; crack propagation; infrared thermography; mix mode loading 1. Introduction The analysis of the kinetics of damage accumulation, the process of crack nucleation an kinetics of the crack propagation allows the specialists to predict the time of structure failure and to perform in proper time a partial replacement or repair of deteriorated units of complex structures. A number of energy based approaches have been developed to study the processes of nucleation and propagation of fatigue cracks in metals Short et al. (1989), Yates et al. (2008), Mokhtarishirazabad et al. (2017). Attempts to derive the equation for crack propagation were made by many authors. They used such quantities as the J-integral, the work of plastic deformation, the size of the zone of plastic deformation, the amount of dissipated energy and other Matvienko and Morozov (2004), Rosakis et el. (2000), Oliferuk et al. (2004), Izyumova and Plekhov (2014). ECF22 - Loading and Environmental effects on Structural Integrity The heat dissipation at fatigue crack tip under mix mode loading O. Plekhov a *, A. Vshivkov a , A. Iziumova a , A. Zakharov b , V. Shlyannikov b a Institute of continuous media mechanics of the Ural branch of Russian academy of science, Ac.Koroleva st.,1, Perm, 614013, Russia b Kazan Scientific C nter of Russian Academy of Sciences, Lobachevskogo str. 2/31, Kazan, 420 11, Russia Abstract The cruciform plane specimens of titanium alloy VT1-0 with a thick of 1 mm were tested to study temperature evolution under fatigue rack propagation. The or ginal contact sensor of heat fl w and method of infrar d thermography were used t analyze the dissipated energy from crack tip during fatigue t sts. A series of experiments was carried out to study the propagation of fatigu crack un er biaxial loading with different biaxial coeffici nt. It has be shown that heat dissipation caused by fatigue crack propagation under Paris regime can be divided into two stages both under uniaxial and biaxial loading conditions. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: energy dissipation; crack propagation; infrared thermography; mix mode loading 1. Introduction The analysis of the kinetics of damage accumulation, the process of crack nucleation and kinetics of the crack propagation allows the specialists to predict the time of structure failure and to perform in proper time a partial replacement or repair of deteriorated units of complex structures. A number of energy based approaches have been developed to study the processes of nucleation and propagation of fatigue cracks in metals Short et al. (1989), Yates et al. (2008), Mokhtarishirazabad et al. (2017). Attempts to derive the equation for crack propagation were made by many authors. They used such quantities as the J-integral, the work of plastic deformation, the size of the zone of plastic deformation, the amount of dissipated energy and other Matvienko and Morozov (2004), Rosakis et el. (2000), Oliferuk et al. (2004), Izyumova and Plekhov (2014). © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. E-mail address: poa@icmm.ru * Corresponding author. E-mail ad ress: poa@icmm.ru

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.249