PSI - Issue 3

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 3 (2017) 424–431 Available online at www.sciencedirect.com ScienceDire t Structural Integrity Procedia 00 (2017) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. Copyright © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy Fatigue assessment by energy approach during tensile and fatigue tests on PPGF35 V. Crupi a , E. Guglielmino a , L. Scappaticci b , G. Risitano a, * a University of Messina, Department of Engineering, Contrada di Dio, 98166 Messina, Italy b Guglielmo Marconi University, Via Plinio 44, 00193 Roma, Italy Abstract Today, lightweight and low cost components can be obtained with short fibre reinforced plastics. The recyclable nature of these materials by comparison to thermoset matrixes composites is also clearly appealing. This paper investigates static and fatigue behaviour for a glass-fibre-reinforced polypropylene composite. Tensile tests were carried out using DIC and IR Camera. Stress vs strain curves and temperature evolution associated to the applied tensile stress were determined. The trend of the surface temperature of the specimen during fatigue tests was analyzed. © 2017 The Authors. Published by Elsevier B.V. Pe r-review under respon ibili y of the Scientific Committee of IGF Ex-Co. Keywords: Fatigue; Therm graphic Method; Dig tal Image Correlation; Infrared Thermography Nomenclature c specific heat capacity at constant pressure [kJ/(kg K)] XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy Fatigue assessment by energy approach during tensile and fatigue tests on PPGF35 V. Crupi a , E. Guglielmino a , L. Scappaticci b , G. Risitano a, * a University of Messina, Department of Engineering, Contrada di Dio, 98166 Messina, Italy b Guglielmo Marconi University, Via Plinio 44, 00193 Roma, Italy Abstract Today, lightweight and low cost components can be obtained with short fibre reinforced plastics. The recyclable nature of these materia s by comparison to thermoset matrixes composi es is also clearly app aling. This p per investigates sta ic and fatigue b haviour for a glass-fibre-reinforced polypropylene composite. Tensile tests were carried out using DIC and IR Camera. Stress vs strain curves and temp ratu e volution associated to the applied t nsile str ss we e etermined. The trend of the su face t mperature of the pecim n du ing fatigue ests was analyzed. © 2017 The Authors. Published by Elsevier B.V. Peer- eview under esp s bility of the Scientific Committee of IGF Ex-Co. Keywo ds: Fatigue; Thermographic M thod; Digita Image Correlation; Infrared Thermography Nomenclature c specific heat capacity at constant pressure [kJ/(kg K)] f frequency [Hz]

frequency [Hz] thermoelastic coefficient [MPa -1 ]

f K m K m N

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. thermoelastic coefficient [MPa -1 ] number of cycle number of cycles to failure

N N f N f R

number of cycles to failure stress ratio

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. surface temperature [K] stress ratio

R T T

surface temperature [K]

* Corresponding author. Tel.: +39 347 3209239. E-mail address: giacomo.risitano@unime.it * Corresponding author. Tel.: +39 347 3209239. E-mail address: giacomo.risitano@unime.it

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review und r responsibility of the Scientific Committee of IGF Ex-Co. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the Scientific Committee of IGF Ex-Co.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. 10.1016/j.prostr.2017.04.068