PSI - Issue 3

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 3 (2017) 224–23 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity 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 Sn and Ti influence on damage of bent hot-dip galvanizing phases Vittorio Di Cocco a, *, Francesco Iacoviello a , Laura D’Agostino a , Stefano Natali b a Università di Cassino e del Lazio Meridionale, DICeM, via G. Di Biasio 43, 03043 Cassino (FR), Italy b Università di Roma “La Sapienza”, DICMA, via Eudossiana 18, 00184, Roma, Italy Abstract Hot dip galvanizing is t e most used tech ique in the metallic protection field. The coating f rmation is mainly due to interdiffusion phenomena between iron and zinc atoms. In the last years, the introduction of different elements allows to obtain baths optimized by different characteristics. For example, the presence of Sn in the bath fluidifies the bath and it allows the formation of coatings characterized by an improved homogeneity of thickness. Presence of Ti, allows to obtain different colors of coatings due to different oxidation of Ti in the coatings. In this work a comparison between coatings obtained by the presence of 3%Sn and 0.5%Ti in the baths has been investigated at five different dipping time. In order to analyse the kinetics of coatings formation and the intermetallic phases, longitudinal sections of the bended specimens have been metallographically prepared and observed by means of an optical microscope (LOM). Finally, the mechanical behaviour of all coatings has been investigated using bending tests carried out on specimens . © 2017 The Authors. Published by Elsevier B.V. Peer- eview under responsib lity of the Scientific Committee of IGF Ex-Co. Keywords: Hot dip galvanizind; Tin influ nce; D mage. 1. Introduction Protection of metallic materials, specially the chipper metallic materials, is more and more important in many fields of civil and industrial fields (1). The hot dip galvanizing is one of most important protection technique due to its cheapness and its kinetics of coating formation, it lends itself well in the continues (low production volume but flexible processes) and discontinues industrial processes (high production volume and low costs), De Abreu, 1999. Zinc-based coatings, o tained by hot dip galvanizing, are characterized by a double effect of corrosion protection, Natali 2004: © 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.: +39.07762994334. E-mail address: v.dicocco@unicas.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 under responsibility 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.2017.04.052