PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1189–1194 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. ECF22 - Loading and Environmental effects on Structural Integrity The experimental and theoretical study of plastic deformation in the fatigue crack tip based on method of digital image correlation A. Vshivkov *, A. Iziumova a , A. Zakharov b , V. Shlyannikov b , O. Plekhov a a Institute of Continuous Media Mechanics Russian Academy of Sciences Ural Branch, Perm, Russian Federation b Kazan Scientific Center of Russian Academy of Sciences, Kazan, Russian Federation Abstract This work is devoted to the experimental study of strain distribution at crack tip using digital image correlation technique. The real strain fields were compared with an elastic solution for verification of a hypothesis about link of the elastic-plastic and elastic strain fields at crack tip using the coupling between Young’s modulus and the secant plasticity modulus. The precracked plane specimens of titanium alloy VT1-0 with a thick of 1 mm were used in experimental program. The method of digital image correlation based on system StrainMaster was used for measurement the plastic deformation with spatial resolution up to 1 mkm. The strain field was obtained for different crack length and different biaxial coefficient was obtained using biaxial testing machine Biss BI-00-502. Numerical simulation of deformation fields at the fatigue crack tip was done. A qualitative correspondence between the theoretical, calculation and experimental results has been shown. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fatigue, crack, deformation, digital image correlation; 1. Introduction Fatigue crack propagation in metals is one the important problems of fracture mechanics. During wide range of crack rates the kinetics of a crack growth can be described by correlation with a value of stress intensity factor (Paris`s law). This correlation is the result of the approximation of many experimental data and doesn`t explain the physical © 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 experimental and theoretical study of plastic deformation in the fatigue crack tip based on method of digital image corr lati n A. Vshivkov a *, A. Iziumova a , A. Zakharov b , V. Shlyannikov b , O. Plekhov a a Institute of Continuous Media Mechanics Russian Academy of Sciences Ural Branch, Perm, Russian Federation b Kazan Scientific C nter of Rus ian Academy of Sciences, Kazan, Russian Federation Abstract This work is devoted to the experimental study of strain distribution at crack tip using digital image correlation technique. The real strain fields were compared with an elastic sol ti for verification of a hypothesis about link of the elastic-plastic and elastic strain fields at crack tip using the coupling betw en Young’s modulus and the secant plasticity modulus. The precracked plane specimens of titanium alloy VT1-0 with a thick of 1 mm were us d in experimental program. The method of digital image correlation based on system StrainMaster was used for measurement the plastic defor ation with spatial resolution up to 1 mkm. The strain field was obtained for different crack length and different biaxial coefficient was obtained using biaxial testing machine Biss BI-00-502. Numerical simulation of deformation fields at the fatigue crack tip was done. A qualitative correspondence between the theoretical, calculation and experimental results has been shown. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: fatigue, crack, deformation, digital image correlation; 1. Introduction Fatigue crack propagation in metals is one the important problems of fracture mechanics. During wide range of crack rates the kinetics of a crack growth can be described by correlation with a value of stress intensity factor (Paris`s law). This correlation is the result of the approximation of many experimental data and doesn`t explain the physical © 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. Tel.: +73422378312; E-mail address: vshivkov.a@icmm.ru * Corresponding author. Tel.: +73422378312; E-mail ad ress: vs ivkov.a@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.2018.12.246