PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 8 (2018) 486–50 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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. Copyright © 2018 The Authors. Published by Elsevi r B.V. Peer-review und r responsibility of the Scientific Committee of AIAS 2017 International Conference Stress Analysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Current challenges in material choice for high-performance engine crankshaft Paolo Citti, Alessandro Giorgetti*, Ulisse Millefanti Guglielmo Marconi University, Department of Innovation and Information Engineering,, Via Plinio 44 - 00193 Rome, Italy Abstract The segment of high-performance cars will progressively deal with the trade-off among cost saving, high performances and quality due to customers ’ higher expectations and the regulations requests for higher-power, safer, more intelligent and environmentally friend cars. Dealing with these complicated systems requires additional designing phases and optimization of all components in terms of performances, reliability and costs. Among such mechanical parts assembled in an Internal Combustion Engine (ICE), the crankshaft is one that still requires extra attention regarding materials choice, thermal treatments, producing processes and costs. The aim of this work is to analyze the actual and future scenarios about the material choice for the crankshaft of high-performance engines. In particular, what is considered here is the actual development and improved quality reached by base materials and manufacturing technologies for this critical component of the engine. In this context, different materials are analyzed, together with surface hardening techniques, thermal treatments and their technical and cost saving potentials. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: ; mechanical component, material selection, crankshaft, steel AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Current challenges in m te ial choice for high-performance engine crankshaft Paolo Citti, Alessandro Giorgetti*, Ulisse Millefanti Guglielmo Marconi University, Department of Innovation and Information Engineering,, Via Plinio 44 - 00193 Rome, Italy Abstract The segment of high-performance cars will progressively deal with the trade-off among cost saving, high performa ces and qu lity du to ustom rs ’ higher expectations and the regulations r quests f r higher-power, saf r, more intelligent and environmentally friend cars. Deali g with these complicated systems requires addition l designing phases a d optimization f all components in terms of performances, reliability and costs. Among such mech nical parts assembled in an Internal Combustion Engine (ICE), the crankshaft is one that still requir s extra attention regarding materials c oice, thermal treatments, producing processes and costs. The aim of th s work is to nalyze the a tual a d future s enario about the material choice for the crankshaft of high-performance engin s. In parti ular, what is considered here is the actual development and improv d quality reach d b base mat rials and manufacturing technologies for this critic l component of th engine. I this c ntext, diff rent materials are analyzed, together with surface hardening techniques, thermal treatments and their technical and cost saving potentials. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: ; mechanical component, material selection, crankshaft, steel

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

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. The need to deepen the aspect of costs savings while designing and manufacturing mechanical components is becoming a feature of hard management by automotive manufacturers. In fact, they must offer products that not only The need to d epen the aspect of costs savings while designing and ma ufacturing mechanical components is becoming a feature of hard management by automotive manufacturers. In fact, they must offer products that not only

* Alessandro Giorgetti Tel.: +39-06-377251; fax: +39-06-37725212. E-mail address: a.giorgetti@unimarconi.it * Alessandro Giorgetti Tel.: +39-06-377251; fax: +39-06-37725212. E-mail address: a.giorgetti@unimarconi.it

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis.

* 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 Copyright  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis 10.1016/j.prostr.2017.12.048