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 Struc ural Integrity 5 (2017) 1205–1212 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Influence of shearing amount and vibration amplitude on noise in shearography H. Lopes a, *, J. V. Araújo dos Santos b , P. Moreno-García c , J. Monteiro d a DEM-ISEP, Instituto Politécnico do Porto, Portugal b IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Portugal c Departamento de Ingeniería Mecánica y Diseño Industrial, Escuela Superior de Ingeniería, Universidad de Cádiz, Spain d Laboratório de Óptica e Mecânica Experimental, INEGI, Porto, Portugal Abstract A method for the evaluation of noise in measurements with shearography is reported in this paper. This method is able to quantify the influence of several parameters, namely the shearing amount and the vibration amplitude of rotations, on the measurements accuracy. The method was applied to the first four modal rotation fields of an aluminum beam in free-free conditions, experimentally obtained with an in-house digital shearography system. The root mean squares of noise and the signal-to-noise ratios of these measurements were computed in order to gain insight into the absolute and relative accuracies, respectively. It was found out that the best measurements are obtained with the largest values of the shearing amount and vibration amplitude. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of th Scientific Committee of ICSI 2017. Keywords: Shearography; Noise; Shearing amount; Vibration amplitude; Signal-to-noise ratio (SNR); Ro t mea square (RMS) 1. Introduction Speckle interferometry techniques are optical methods dedicated to the experimental measurement of the deformation in opaque bodies with reflective surfaces. These measurements are based on the optical path and the changes in the refractive index media between the light source and an electronic recording device (Schnars and Jueptner (2005)). Electronic speckle pattern interferometry and digital shearography are the most common speckle 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Influence of shearing amount and vibration amplitude n noise in shearography H. Lopes a, *, J. V. Araújo dos Santos b , P. Moreno-García c , J. Monteiro d a DEM-ISEP, Instituto Politécnico do Porto, Portug l b IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Portugal c Departamento de Ingeniería Mecánica y D seño Industri l, Escuela Superior de Ingeniería, Universidad de Cádiz, Spain d Laborató o de Óp ica e M cânica Experimental, INEGI, Porto, Portugal Abstract A method for the aluation of noi e in easur ments with shearography is reported in th s paper. This meth d is abl to quantify the influence of s veral parameters, namely the shearing amount and the vibration amplitude of rot tions, on the measureme ts accu acy. The method as applied to the first fou modal rotation fields f an aluminum beam in free-free conditi ns, experimentally obtain d with an in-house igital shearo raphy system. T root m a squares of noise and the signal-to-noise ratios f hese m asure nts were computed i order to gain insight into the absolute and relative accuracies, respec ively. It was found out that the best measurements are obtained with the largest values of the shearing amount and vibration amplitude. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Shearography; Noise; Shearing amount; Vibration amplitude; Signal-to-noise ratio (SNR); Root mean square (RMS) 1. Introduction Speckle interferometry techniques are optical methods dedicated to the experimental measurement of the deformation in opaque bodies with reflective surfaces. These measurements are based on the optical path and the changes in the refractive index media between the light source and an electronic recording device (Schnars and Jueptner (2005)). Electronic speckle pattern interferometry and digital shearography are the most common speckle © 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.

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.2017.07.043 * 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. T l.: +0-351-22-834-0500 ; fax: +0-351-22-832-1159. E-mail address: hml@isep.ipp.pt * Corresponding author. Tel.: +0-351-22-834-0500 ; fax: +0-351-22-832-1159. E-mail address: hml@isep.ipp.pt