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 Structu al Integrity 5 (2017) 325–331 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. 2 nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Dynamic Assessment of the São João Bridge Structural Integrity Xu Min*, Luís Oliveira Santos National Laboratory for Civil Engineering, Structures Department, Lisbon, Portugal São João Bridge, crossing the River Douro, in Oporto, is open to traffic since 1991. It is a prestressed concrete bridge, with a main span of 250 m and a total length of 1028 m. Its structural behaviour has been monitored since construction. In 2014, a vibration based continuous moni oring system was installed on the bridge. An integrated proc ure was devel ped to automatically carry out the data processing and to extract the modal parameters in real time, using the Stochastic Subspace Identification technique (SSI) and cluster analysis. This paper presents the evolution of its structural health monitoring system, as well the procedure developed for the dynamic assessment of the São João Bridge. Some experimental results are presented and compared with the values predicted by a finite element model. The influence of both environmental conditions and operational factors is discussed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Structural Health Monitoring; Structural Integrity 1. Introduction São João Bridge is a prestressed concrete railway bridge, ballast-free tracks laid (Fig. 1). Designed by Edgar Cardoso, this bridge crossing the River Douro, in Oporto, Portugal, is open to traffic since 1991. This bridge was instrumented during the construction and its structural behaviour has been experimentally followed since then. However, the observation of the bridge was based only on periodical measurements. Ten years ago, this system was updated in order to introduce automatic data acquisition with remote access. 2 nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Dynamic Assessment of the São João Bridge Structural Integrity Xu Min*, Luís Oliveira Santos National Laboratory for Civil Engineering, Structures Department, Lisbon, Portugal Abstract São J ão Bridge, crossing the River Douro, in Oporto, is op n to traffic inc 1991. It is a prestressed concrete bridge, with a main span of 250 m and a total length of 1028 m. Its structural ehaviour has been monitored since construction. In 2014, a vibration based continuous mo itoring system was installed on the bridge. An integrated procedure was developed to automatically carry out the data processing and to extract the modal parameters in real time, using the Stochastic Subspace Identification techniqu (SSI) an cluster analysis. This paper presents the evolution of its structural he lth monitoring system, as well the procedur develo ed for the dynamic assessment of the São João Bridge. Some experimental result are presented and c mpared with the values predicted by a finite element model. The influence of both environmental conditions and operational factors is discussed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Structural Health Monitoring; Structural Integrity 1. Introduction São João Bri e is a prestressed concrete railway bridge, ballast-free tracks laid (Fig. 1). Designed by Edgar Cardoso, this bridge crossing the River Douro, in Oporto, Portugal, is open to traffic since 1991. This bridge as instrumented during the construction and its structural behaviour has been experimentally followed since then. However, the observati n of the bridge was based only on periodical measurements. Ten years ago, this system was updated in order to introduce automatic data acquisition with remote access. © 2017 The Authors. Published by Elsevier B.V. Peer-review u der r sponsibility 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. Abstract

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.2017.07.178 * 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.: +00351 21 844 3614; fax: 00351 21 844 3011. E-mail address: xumin@lnec.pt * Corresponding author. Tel.: +00351 21 844 3614; fax: 00351 21 844 3011. E-mail address: xumin@lnec.pt