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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. © 2018 The Authors. Published by Elsevier Ltd. This is an op n access article under the CC BY-NC-ND license (h p://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Material . 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Towards the enhancement of medical imaging with non-destructive testing (NDT) CMOS sensors. Evaluation following IEC 62220-1-1:2015 international st ndard N. Martini a , V. Koukou a , G. Fountos a , I. Valais a , A. Bakas b , K. Ninos c , I. Kandarakis a , G. Panayiotakis d , Ch. Michail a, * a Radiation Physics, Materials Technology and Biomedical Imaging Lab, Dept. of Biomedical Engng, Univ. of West Attica, Athens 12210, Greece b Dept. of Biomedical Sciences, Univ. of West Attica, Athens 12210, Greece c Dept. of Electrical and Electronic Engineering, Univ. of West Attica, Athens 12210, Greece d Dept. of Medical Physics, Faculty of Medicine, Univ. of Patras, 265 00 Patras, Greece Abstract The aim of the current work was to investigate the modulation transfer function (MTF) of a non-destructive testing (NDT)/ industrial inspection CMOS sensor in conjunction with a calcium tungstate (CaWO 4 ) thin screen, following both the IEC 62220 1:2003 and IEC 62220-1-1:2015 methods. Thin screen samples, with dimensions of 2.7x3.6 cm 2 and mean coating thickness of 36.26 mg/cm 2 (actual thickness: 118.9 μm estimated from scanning electron microscopy-SEM images) were extracted from an Agfa Curix universal screen and were manually coupled to the active area of a high resolution, active pixel (APS), complementary metal oxide semiconductor (CMOS) sensor. Experiments were performed using the RQA-5 beam quality, as described in the IEC series. Modulation transfer function was assessed using the slanted-edge method. The final MTF, following IEC 62220-1-1:2015 was obtained through averaging the oversampled edge spread function (ESF), using a custom-made software developed in our laboratory. MTF values were found with close agreement in the low and medium spatial frequency ranges, for both methods. Thereafter, MTFs calculated following the 62220-1:2003 protocol, were found overestimated for spatial frequencies higher than 5.7 cycles/mm. The combination of the thin calcium tungstate screen and the CMOS sensor provided very promising image resolution properties and thus could be also considered for use in CMOS based X-ray imaging devices, for various applications. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of aterials 1 st International onference of the Greek Society of xperi ental echanics of aterials r s t t f i l i i it - str ti testing (NDT) CMOS sensors. l ti f ll i I - - : i t r ti l st r . artini a , . oukou a , . ountos a , I. alais a , A. Bakas b , . inos c , I. andarakis a , . anayiotakis d , h. ichail a, * a Radiation Physics, Materials Technology and Biomedical Imaging Lab, Dept. of Biomedical Engng, Univ. of West Attica, Athens 12210, Greece b Dept. of Biomedical Sciences, Univ. of West Attica, Athens 12210, Greece c Dept. of Electrical and Electronic Engin ering, U v. of West Attica, Athens 12210, Greece d Dept. of Medical Physics, Faculty of Medicine, Univ. of Patras, 265 00 Patras, Greece Abstract The aim of the current work was to investigate the modulation transfer function ( TF) of a non-destructive testing (NDT)/ industrial inspection C OS sensor in conjunctio with a calcium tungstat (Ca O 4 ) thin screen, following both the IEC 62220 1:2003 and IEC 62220-1-1:2015 methods. Thin screen samples, with dimensions of 2.7x3.6 cm 2 and mean coating thickness of 36.26 mg/cm 2 (actual thickness: 118.9 μm estimated from scanning electron microscopy-SEM images) were extracted from an Agfa Curix universal screen and were manually coupled to the active area of a high resolution, active pixel (APS), complement ry metal oxide semiconduc r (C OS) sensor. Experiments were perform d using the RQA-5 beam quality, as described in the IEC series. odulation transfer function was assessed using the lanted-edge method. The final TF, following IEC 62220-1-1:2015 was obtained through averaging the oversampled edge spread functio (ESF), using a custom-made software developed in our laboratory. TF values were found with close agreement in the low and medium spatial frequency ranges, for both methods. Ther after, TFs calculated following the 62220-1:2003 protocol, were found overestimated for spatial frequencies higher than 5.7 cycles/mm. The combination of the thin calcium tungstate screen and the C OS sensor provided very promising image resolution properties and thus could be also considered for use in C OS based X-ray imaging devices, for various applications. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials © 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. Keywords: Non-destructive testing; CaWO 4 ; medical imaging; APS; CMOS sensors; IEC; MTF Keywords: Non-destructive testing; Ca O 4 ; medical imaging; APS; C OS sensors; IEC; TF

* Corresponding author. Tel.: +30 210 5385387 E-mail address: michail@upatras.gr Received: May 31, 2018; Received in revised form: July 04, 2018; Accepted: July 12, 2018 * Corresponding author. Tel.: +30 210 5385387 E-mail address: michail upatras.gr Received: ay 31, 2018; Received in revised form: July 04, 2018; Accepted: July 12, 2018

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 10.1016/j.prostr.2018.09.045 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental echanics of aterials * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt