PSI - Issue 2_A

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 Struc ural Integrity 2 (2016) 1813–182 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Effect of hot-dip galvanization on the fatigue behaviour of welded structural steel F. Berto a, *, F. Mutignani a , L. Pittarello a a Dept. of Management and Engineering, University of Padua, Stradella S. Nicola 3, 36100, Vicenza, Italy This paper investigates the effect of a galvanizing coating on the fatigue strength of S355 structural steel. While in the literature some results from fatigue tests made on u notched specimens can be found, very few results re available dealing with notched components and, at the best of authors’ knowledge, no results are available dealing with welded joints. The aim of the present paper is to partially fill this lack of knowledge. A comparison is carried out, between hot dip galvanized fillet welded cruciform joints made by S355 structural steel and not treated welded joints characterized by the same geometry, subjected to a load cycle = 0 . 34 new experimental data are summarized in the present contribution, in terms of stress range and averaged strain energy density range in a control volume of radius 0 = 0.28 mm . © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: galvanized steel; high cycle fatigue; fillet welded cruciform joint; SED. 1. Introduction Hot-dip galvanizi g is a surface treatment that allows protecting components from corrosion. Galvanizing is found in several industrial applications, in particular when iron or steel are used. Hot-dip galvanizing has a proven and growing history of success in a large number of applications worldwide. While the monotonic behaviour of steel is not greatly affected by the presence of the zinc layer, except for the yield stress, under cyclic stress the fatigue strength is usually reduced. This point has been discussed by Bergengren and Melander (Bergengren and Melander, 1992) dealing with high-strength steels without any stress concentration effect or geometrical discontinuity. In (Bergengren and Melander, 1992) it was found that there is a reduction of the 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Effect of hot-dip galvanization on the fatigue behaviour of welded structural steel F. Berto a, *, F. Mutignani a , L. Pittarello a a Dept. of Management and Engineering, University of Padua, Stradella S. Nicola 3, 36100, Vicenza, Italy Abstract This paper investigates the effect of a galvanizing coating on the fatigue strength of S355 structural steel. While in the literature some results from fatigue tests made on unnotched specimens can be found, very few results are available dealing with notched c ponents and, at he best of authors’ k owledge, no results re available d aling with welded joints. The im of t e present paper is to p rtially fill thi lack of knowledge. A compari on is carried out, b tween hot dip galvan zed fill t welded cruciform joints made by S355 structur l steel and not treated welded joints characterized by the same geometry, subjected to a load cycle = 0 . 34 new experimental da a are summarized in th present ontribution, in terms of stress range and average strain energy density rang in a control volu e of radius 0 = 0.28 mm . © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: galvanized steel; high cycle fatigue; fillet welded cruciform joint; SED. 1. Introduction Hot-dip galvanizing is a surface treatm nt that allows protecting components from c rrosion. Galvanizing is found in several industrial pplic tions, in particular wh n ro or steel are used. Hot-dip galvanizing has a proven and growing history of success n large umber of applicat ons worldwid . While the monot nic behaviour of steel is not great y ffected by the presence of the zinc layer, except for the yield str ss, under cycli stress the fatigue stre g h is usually reduced. This poi t has be n dis uss d by Bergengren and Melander (Bergengren and Mel nder, 1992) dealing with high-strength steels without any stress concentration effect or geometrical disconti uity. In (Bergengren and Melander, 1992) it was found at here is a reductio of the Copyright © 2016 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 ECF21. © 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. Abstract

* Corresponding author. Tel.: +39 0444 998747. E-mail address: berto@gest.unipd.it * Corresponding author. Tel.: +39 0444 998747. E-mail address: berto@gest.unipd.it

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 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 ECF21. 10.1016/j.prostr.2016.06.228