PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 8 (2018) 212–219 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. 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 AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Study and modelling of the passenger safety devices of an electric vehicle by finite elements E. V. Arcieri a,b , S. Baragetti a,c *, M. Fustinoni b , S. Lanzini b , R. Papalia b a GITT - Centre on Innovation Management and Technology Transfer, University of Bergamo, Via Salvecchio 19, Bergamo (BG) 24129, Italy b NOVA S.r.l., Via Silone 81, Urgnano (BG) 24059, Italy c Department of Management, Information and Production Engineering, University of Bergamo, Viale Marconi 5, Dalmine (BG) 24044, Italy Abstract Electric mobility gets mainly involved quadricycles and cars. Between these two vehicle types there are differences in terms of stability, performance, cost, autonomy and safety. The authors studied the implementation of passenger safety devices on a prototype for an electric vehicle derived from a heavy quadricycle. A finite element analysis starting from experimental results was car ied out in order to determine the effectiveness in case of frontal and side crashes. © 2017 The Authors. Published by Elsevier B.V. Peer-review under res onsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: passenger safety; electric vehicle; ULV; FEM modelling 1. Introduction Nowadays electric mobility is an attractive challenge because of its low environmental impact. Furthermore, small dimensions of the vehicle are researched in order to move in the cities. Electric Ultra-Light vehicles (ULV) match these requirements although thei low safety performances stated in EuroNCAP (2016). This work aims to evaluate the possibility to improve the passenger safety of an ULV prototype deriving from a heavy quadricycle. The car would cost more than a heavy quadricycle and less than a small electric car and has a pioneering tubular chassis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Study and m delling of the passenger safety devices of an electric vehicle by finite elements E. V. Arcieri a,b , S. Baragetti a,c *, M. Fustinoni b , S. Lanzini b , R. Papalia b a GITT - Centre on Innovation Management and Technology Transfer, University of Bergamo Via Salvecchio 19, Bergamo (BG) 24129, Italy b NOVA S.r.l., Via Silon 81, Urgnano (BG) 24059, Italy c Department of Management, Information and Production Engineering, University of Bergamo, Viale Marconi 5, Dalmine (BG) 24044, Italy Abstract Electric mobility gets mainly involved qua ricycles and cars. Between thes two vehicle types there are differ nces in t rms of stability, performan e, ost, autonomy and safety. The authors studied the impleme t tion of passenger safety d vices on a prototype for an electric vehicle derived from a heavy qu dricycle. A fi ite el ment analysis starting from experimental results was carried out in order to determine the effectiveness in case of frontal and side crashes. © 2017 The Authors. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conferenc on Stress Analysis. Keywords: passenger safety; electric ve icle; ULV; FEM modelling 1. Introduction Nowadays electric mobility is an attractive challenge because of its low environmental impact. Furthermore, small dimensions of the ve icle are researched in order to mov in th cities. Electric Ultra-Light vehicles (ULV) match thes requi ement alth ugh their low safety p rf rmances stated in EuroNCAP (2016). This work aims to evaluate the possibility to improve the passenger saf ty of an ULV prototype deriving from a heavy quadricycle. The car would cost more than a heavy quadricycle and less than a small electric car and has a pioneering tubular chassis © 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.: +39-035-205-2382; fax: +39-035-205-2221. E-mail address: sergio.baragetti@unibg.it. * Correspon ing author. Tel.: +39-035-205-2382; fax: +39-035-205-2221. E-mail address: sergio.baragetti@unibg.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.2017.12.023