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) 22 –226 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

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. 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 Electro-mechanical endurance tests on smart fabrics under controlled axial and friction forces Giorgio De Pasquale a, , Andrea Mura a * a Department of Mechanical and Aerospace Engineering, Politecnico di Torino, corso Duca degli Abruzzi 24, Torino, Italy Abstract The design, building and validation of machine for endurance tests on fabrics are described in this paper. The system is addressed to the reliability testing of smart fabrics with electrical conductivity. The development of e-textiles, in fact, requires innovative test bench s for the valuation of performances d cay with load cycles accumulation; the proposed system is able to monitor the electro mechanical parameters of fabric sample in the same time in order to support industrial development and predict failures on final applications. © 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: electro-mechanical reliability; lifetime; experimental mechanics; wearable sensing 1. Introduction Smart f brics consist in textiles featuring wov n electro ics and in erconnection . The mechanical properties of smart fabrics, in terms of flexibility and strength allow cr ating many applications of w arable electronics that cannot be realised with other existing electronic manufacturing processes. The rapid evolution of wearable electronic drives the grown interest in smart textiles Stoppa et al. (2014) and many applications have already been developed, in different fields. As some examples, in medical and biomedical many wearable devices have been developed: electrocardiogram (ECG) electrodes Cho et at. (2011) , electromyography (EMG) Linz et al. (2007) , and electroencephalography (EEG) Löfhede et al. (2010) , temperature measurement AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Electro-mechanical endurance tests on smart fabrics under controlled axial and friction forces Giorgio De Pasquale a, , Andrea Mura a * a Department of Mechanical and Aerospace Engineering, Politecnico di Torino, corso Duca degli Abruzzi 24, Torino, Italy Abstract The design, building and validation of mac in for endurance tes s on fabrics are describ d in thi paper. The system is addr ss d to the reliability testing of smart fabrics with electrical cond ctivity. The developm nt f e-textiles, in fact, requires innovative est benches for the evaluation of performances decay with load cycles accumulation; the proposed system is able to monitor the electro mechan cal parameters of fabric sample in the same time in order to support industrial development and predict failures on final applications. © 2017 The Authors. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: electro-mechanical reliability; lifetime; experimental mechanics; wearable sensing 1. Introduction Smart fabrics consist in textiles eaturing woven elect onics and inte conn cti ns. Th mechanical propertie of smart fabrics, in terms of flexibility and strength allow cr ating many applications of wearable electronics that cannot be realised with other existing electronic manufacturing pr cesses. The rapid evolution of wearable electronic drives the grown interest in smart textiles Stoppa et al. (2014) and many applications have already been developed, in different fields. As some examples, in medical and biomedical man wearable devices have been developed: electrocardiogram ( CG) electrodes Cho et at. (2011) , electromyography (EMG) Linz et al. (2007) , and electroencephalography (EEG) Löfhede et al. (2010) , temperature measurement © 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.

* Andrea Mura. Tel.: +39 011.0905907. E-mail address: andrea.mura@polito.it * Andrea Mu a. Tel.: +39 011.0905907. E-mail address: andrea.mura@polito.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.2017.12.024