PSI - Issue 1

ScienceDirect Procedia Structural Integrity 1 (2016) 242–248 Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integ ity Procedia 00 (2016) 000 – 000 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

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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. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Effect of g om trical parameters on Friction Stir Welding of AA 5083-H111 T-joints J.S. Jesus a *, M. Gruppelaar a , J.M. Costa a , A. Loureiro a , J.A.M. Ferreira a a CEMUC- Departamento de Engenharia Mecânica, Faculdade de Ciências e Tecnologia da Universidade de Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal Abstract The aim of this research is to study the effect of three different tool geometries and two joint geometries on quality of AA 5083-H111 T-welds done using the friction stir welding process (FSW). All the tools have concave shoulder with different pin geometries: tapered and threaded, quadrangular pyramidal and progressive pin, part threaded cylindrical and part pyramidal. T-lap and T-butt joints configurations have been studied. Tunnel and kissing-bond type defects have been found in joints produced with a pyra idal pin tool, while welds roduced with th tapered pin tool only show presenc of oxide lines. Sound we ds were p oduced with the progres ive tool. No significant change in hardness has been observ d in all combinations of to l and joint geometry. The te sile strength efficiency in joints welde with the pr gressive pin to l has been found to be 100%. The fatigue results(R=0) show a higher fatigue str ngth of FSW T-joints than T-joints welded by conventional process as Metal Inert Gas (MIG). © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Friction stir welding; AA 5083-H111; T-joints XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Effect of geometrical parameters on Friction Stir Welding of AA 5083-H111 T-joints J.S. Jesus a *, M. Gruppelaar a , J.M. Costa a , A. Loureiro a , J.A.M. Ferreira a a CEMUC- Departamento de Engenharia Mecânica, Faculdade de Ciências e Tecnologia da Universidade de Coimbra, Rua Luís Reis Santos, 3030-788 oimbra, Portugal Abstract The aim of this research is to study the effect of three different tool geometries and two joint geometries on quality of AA 5083-H111 T-welds done using the friction s ir welding process (FSW). All the tools have concave shoulder with different pin geometries: tapered and threaded, quadrangu ar pyramidal and progressive pin, part threaded cy indrical and par yramid l. T-lap and T-butt joints configurations have been stu ied. Tunnel and kissing-bond typ defects have been found in joints produced with a pyramidal pin tool, while welds produce with the tapered pin tool only show pre ence of oxide lines. Sound welds were produced with the progr ssive tool. No significan change in hardnes has bee observe in all c mbination of tool an joint geometry. The tensile strength efficien y in joi ts welded with th progres ive pin tool h s been found to be 100%. T e fatigue results(R=0) show a high r fa igue strength of FSW T-joints than T-joints w lded by conventional process as Metal Inert Gas (MIG). © 2016 The Author . Published by Elsevier B.V Peer-review under espons bility of the Scientific Committee of PCF 2016. Keywords: Friction stir welding; AA 5083-H111; T-joints Copyright © 2015 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 PCF 2016.

1. Introduction

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introduction

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. The T joints in aluminium alloys are widely us d in the industry in the transport sector, for example in aircraft, shipbuilding and land transport vehicles. The welding of T-joints in these alloys by MIG process has many difficulties such as high porosity, hot cracking and large distortion these defects behaviour. Friction Stir Welding The T joints in aluminium alloys are widely used in the industry in the transport sector, for example in aircraft, shipbuilding and l nd transport vehicles. The w ld g of T-joints n these alloy by MIG process has m ny diffic lties such as high porosity, hot cracking and lar e distortio these d f cts behaviour. Fricti n Stir Weldi g

* Corresponding author. Tel.: +351239790736; fax: +351 239790701. E-mail address: joel.jesus@uc.pt * Corresponding author. Tel.: +351239790736; fax: +351 239790701. E-mail ad ress: joel.jesus@uc.pt

* 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 PCF 2016. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the Scientific Committee of PCF 2016.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2015 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 PCF 2016. 10.1016/j.prostr.2016.02.033