PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1433–1438 Available online at www.sciencedirect.com ScienceDirect 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Fatigue Life Assessment of Friction Stir welded Dissimilar Polymers Shayan Eslami 1, *, Paulo J Tavares 1 , P M G P Moreira 1 1 INEGI, Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr. Roberto Frias 400, 4200-465 Porto, Portugal In this study, two dissimilar polymers with different thicknesses were welded in the lap joint configuration in order to investigate the fatigue behavior of the obtained welds. A comprehensive study of the fatigue life of friction stir welded dissimilar polypropylene-to-polyethylene in lap shear configuration is presen ed. There is a lack of research works published on this topic; to the authors knowledge this is the first paper concerning the fatigue behavior of polymeric friction stir welded lap joints. The fatigue life of the strongest welds was compared with the highest performing base material. The FSW joints had good resistance under cyclic lo ding but in a brittle behavior due to degradation of polymers during this process. The retreating side of the welds suffer from lack of generated heat when compared with the advancing side due to the low thermal conductivity of polymeric materials, leading to crack initiation at the retreating side. However, using high testing frequency, the parent material failed thermally during fatigue tests, while FSW specimens behaved differently. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Friction stir welding (FSW); Fatigue; Polymer; Welding. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Fatigue Life Assessment of Friction Stir welded Dissimilar Polymers Shayan Eslami 1, *, Paulo J Tavares 1 , P M G P Moreira 1 1 INEGI, Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr. Roberto Frias 400, 4200-465 Porto, Portugal Abstract In this st dy, two dissimilar p lymers with ifferent thicknesses were welded in the lap joint c nfiguration in order to investigate the fatigue b havi r of th obtained welds. A comprehensive study of the fatigue life of friction st r welded dissimilar polypropylene-to-polyethylene in lap shea figuration is pres nt d. There is a lack of research works pub ished on this topic; to th authors knowledge thi is the first paper concernin the fatigue behavior of polymeric friction stir welde lap joints. The fatigue life of the strongest welds was compared with the highest perfor ing base material. The FSW joints had good resistance und cyclic loadin but in a brittle b havior du to degradation of polym rs during this proc ss. The retreating side of th welds suffer from lack of generated he when compared with th advanci g side due to the low thermal co ductivity of p lym ric materials, leading to crack nitiation at the retreating side. However, using high testing frequency, the parent material failed thermally during fatigue tests, while FSW specimens behaved differently. © 2017 The Authors. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Friction stir welding (FSW); Fatigue; Polymer; Welding. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Friction Stir Welding (FSW) is a solid-s ate welding technology that was developed in 1991 for joining soft metals [1]. FSW technique works based on the generated heat produced by friction between the parent material surface and Friction Stir Welding (FSW) is a solid-state welding technology that was developed in 1991 for joining so t metals [1]. FSW technique works based on the ge erated heat pr duced by friction between the parent material surface and Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction 1. Introduction

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.208 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Correspon ing author. Tel.: +34-913-365-375; fax: +34-913-366-680. E-mail address: seslami@inegi.up.pt * Corresponding author. Tel.: +34-913-365-375; fax: +34-913-366-680. E-mail address: seslami@inegi.up.pt