PSI - Issue 3

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 3 (2017) 201–207 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 il l li t . i i t. tr t r l I t rit r i ( )

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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 Damaging micromechanisms in an as cast ferritic and a ferritized ductile cast iron Laura D’Agostino a *, Vittorio Di Cocco a , Diego O. Fernandino b , Francesco Iacoviello a a Università di Cassino e del Lazio Meridionale, DiCeM, via G. DI Biasio 43, Cassino (FR), Italy b INTEMA – Faculty of Engineering, National University of Mar del Plata – CONICET, Av. Juan B. Justo 4302, Mar del Plata, Argentina Abstract Me hanical behavior and damaging micromechanisms in Ductile Cast Irons (DCIs) are strongly effected by matrix microstructure (e.g., phases volume fraction, grains size and grain distribution) and graphite nodules morphology peculiarities (e.g., nodularity level, nodule size, nodule count, etc.). The influence of the graphite nodules depends on both the matrix microstructure and the loading conditions (e.g., quasi-static, dynamic or cyclic loadings). According to the most recent results, these graphite nodules show a mechanical properties gradient inside the graphite nodules, with the graphite elements – matrix debonding as only one of the possible damaging micromechanisms. In this work, two differe t ferritic DCIs were i vestigated (a f rritic matrix obtained from -cast condition and a ferritized matrix) focusing on t damaging micromechanisms in graphite nodules due to t nsile stres . Specimens lat ral surfaces were observed usin a Scan ing Electron Microscope (SEM) d r tests fo lowi g a step by step procedur . © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. Keywords: Ductile cast irons (DCIs); Tensile test; Graphite nodules; Damaging micromechanisms. Introduction Ductile cast irons (DCIs) are characterized by the presence of free graphite with a nodule shape obtained by means of a chemical composition control inst ad of extended annealing treatment of white irons as in malleable irons. Thanks to this peculiar graphite shape, instead of lamellae as in grey cast iron, DCIs are able to combine the castability of L a i it i i l i i i l , i , i . I i i , i ( ), It l b I lt f i i , ti l i it f l l t I , . . t , l l t , ti i l i ing micromechanisms in Ductile Cast Irons (DCIs) are strongly effected by matrix microstructure . ., l ti , i i i i t i ti it l l li iti . ., l it l l, l i , l t, t . . i l t it l t t t i i t t t l i iti . ., i t ti , i li l i . i t t t t lt , t it l i l ti i t i i t it l , it t it l t t i i l t i l i i i . t i , t i t iti i ti t iti t i t i t iti iti t i i t i i i i it l t t il t . i l t l i i l t i i t t t ll in t t e. t . li l i . . i i ilit t i ti i itt . : til t ir ( I ); il t; r t l ; i i r i . In oductio til t i t i t it it l t i i l iti t l i te t li t t t it i i ll l i . t t i li it , i t l ll i t i , l t i t t ilit © 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.: +39.07762993681; fax: +39.07762993781. E-mail address: laura.dagostino@unicas.it i t r. l.: . ; f : . . - il : l r . ti i .it rr

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

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.2017.04.045