PSI - Issue 5

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 Struc ural Integrity 5 (2017) 126 –1266 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 A DFT-based method for 3D digital im ge correlation Francisco Barros a, *, Pedro J. Sousa a , Paulo J. Tavares a , Pedro M. G. P. Moreira a a INEGI, Universidade do Porto, Rua Dr. Roberto Frias, 400, Porto 4200-465, Portugal The present work describes an approach to digital image correlation (DIC) which is based on calculations performed on the image Fourier domain. The developed method uses the cross-correlation peak of ima e subsets computed through the discrete Fourier transform (DFT) to arrive at estimation of the rigid translation between them, thus enabling the detection of three-dimensional shapes from stereo image pairs and the computation of their displacements between images captured at different loading conditions. The method is expected to offer possible advantages in terms of robustness to lighting conditions, displacement estimation precision, and computational speed. In order to verify that this method can reproduce results from conventional DIC, images of a quasi-static tensile test of a round specimen are use to compare the values obtained from the DFT based method with the results from commercial software using he traditional int nsity field based approach to DIC. © 2017 The Authors. Published by Elsevier B.V. Peer-revi w under responsibility of th Scientific Committee of ICSI 2017. Keywords: Digital Image Correlation; Discrete Fouri r Transform; Structural Monitoring; Stru tural Integrity 1. Introduction Spatial displacement measurements between different images are a common image processing operation in different engineering fields. Digital image correlation (DIC), for instance, is a non-contact, full-field, optical technique to measure displacement fields in both in-plane or out-of-plane loading conditions, that makes use of different measurements from distinct image pa titions rmed subsets. DIC entails recording multiple images in different stages of a test, dividing them in smaller subsets, and tracking their displacement along the different captured images, r s 00-465, Portugal d t © 2017 The Authors. Published by Elsevier B.V. nts be different engineering fields. Digital image correlation (DIC), for instance, is a non-contact, full-field, optical technique to measure displacement fields in both in-plane or out-of-plane load © 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. Abstract

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* Corresponding author. Tel.: +351-22-9578710. E-mail address: fbarros@inegi.up.pt

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.2017.07.100 * 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. Peer