PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1393–14 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i i t. tr t r l I t rit r i ( )

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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 Evaluation of the fretting wear damage on crowned splined couplings Francesca Curà a , Andrea Mura a * a Politecnico di Torino, Department of Mechanical and Aerospace Engineering, C.so Duca degli Abruzzi 24, Torino 10129, Italy Abstract Splined couplings are widely used in many industrial fields and one of the most problematic failure mode of these components is fretting wear. Fretting wear appears becaus of the relative moti ns between te th and it is mainly due to angular misalignments. Aim of this paper is to set up a procedure in order to identify the entity of the fretting wear damage in crowned splined couplings in real working conditions. The first Ruiz parameter has been chosen to quantify the wear damage being relatively easy to be obtained from the calculation point of view. Experimental tests have been performed by means of a dedicated test rig to validate the theoretical results, in terms of iso-Ruiz maps. The damage entity has also been quantified by measuring the angular rotation before and after each test. Obtained results confirm that, where the fretting map shows higher values of the Ruiz parameter, the fretting damage becomes more important. © 2017 The Aut ors. Published by Elsevier B.V. Peer- eview under responsib lity of the Scientific Committee of ICSI 2017. Keywords: splin co pling; test rig; fretting; mis lign nt; Ruiz par meter 1. Introduction At the beginning of the last century, the increase in machine performance has led to the evidence of new damage events or pr mature failure in components, due to the phenomenon generally referred as fatigue. Similarly, in ecent decades, the progresses in t chnology have led to further improvements in machine performance in terms of power, dynamic behavior and weight reduction but, on the other hand, they have led to the arising of new types of damage, in particular the damaging phenomenon known as fretting (Waterhouse (1992)). eira, r n a a a lit i i i , t t f i l i i , . li i , i , It l Splined couplings i l i i t i l i l t t l ti il re de of t mponent i tti . tti t l ti tio t t et it i i l t l i li t . i t i i t t i t i ti t tit t tti i li li i l i iti . i t i t t ti t i l ti l t t i t l l ti i t i . i t l t t i t t t i t li t t t ti l lt , i t i i . tit l ti i i t l t ti t t t. t i lt i t t, t tti i l t i t , t tti i t t. h ut o s. li b l i . . r-review i ilit t i ti i itt . : li li ; t t ri ; fr tti ; i li t; i r t r . i t t i i t l t t , t i i i l t t i t e t il i t , t t ll ti . i il l , i t , t i t l l t t i t i i i t , i i i t ti t, t t , t l t t i i t , i ti l t i tti t . © 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. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +39 011-0906930; fax: +39 011-0906999. E-mail address: andrea.mura@polito.it i t r. l.: - ; f : - . - il : r . r lit .it rr

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.2017.07.203 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. l i r . . i i ilit t i ti i itt . - t r . li