PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 648–651 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental Effects on Structural Integrity Toward a non-destructive diagnostic analysis tool of exercises pipelines: models and experiences Gabriella Bolz n * , Marco Tala i Department of Civil and Environmental Engineering, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy Abstract Strategic networks of hydrocarbon pipelines, in long time service, are adversely affected by the action of aggressive chemicals transported with the fluids and dissolved in the e vironment. Material degradation ph nomena are amplified in the presence f hydrogen and water, elements that increase the material brittleness and reduce the safety margins. The risk of failure during operation of these infrastructures can be reduced, if not prevented, by the continuous monitoring of the integrity of the pipe surfaces and by the tracking of the relevant bulk properties. A fast and potentially non-destructive diagnostic tool of material degradation, which may be exploited in this context, is based on the instrumented indentation tests that can be performed on metals at different scales. Preliminary validation studies of the significance of this methodology for the assessment of pipeline integrity have been carried out with the aid of interpretation models of the experiments. The main results of this ongoing activity are illustrated in this contribution. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: diagnostic analysis; non-destructive testing; simulation models; pipelines. 1. Introduction European energy needs are partly covered by hydrocarbons transported through a wide long distance network of pipelines. The main gas supplies originate from fields located in Saharan Countries and in the former Soviet Union (Pirani and Yafimava, 2016). Thus, the pipes are either exposed to a peculiar environment or exercised since a rather long time. ECF22 - Loading and Environmental Effects on Structural Integrity Toward a non-destructive diagnostic analysis tool of exercises pipelines: models and experiences Gabriella Bolzon * , Marco Talassi Department of Civil and Environmental Engineering, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy Abstract Strategic networks of hydrocarbon pipelines, in long time service, are adversely affected by the action of aggressive chemicals transported ith the flui s and dissolv d in the environ ent. Material degradation phenomena are ampli ied in the pres nce of hydrogen and w ter, elements that increas the material brittleness an reduce th safety m rgins. The risk of failure during operatio of these infrastructures ca b r duced, if not prevent d, by th continuous monitoring of the integrity of the pipe surfaces and by the tracking of the relevant bulk properties. A fast and potentially non-destructive diagnostic tool of material degradatio , which m y be exploited in this context, is ba ed on the instrumented indentation tests that can be perfor ed on metals at different scales. Pr liminary validation studie of the significance of this methodol gy for the assessment of pipeline integrity have b en carried out with the id of interpretati n models of the experiments. The main results of thi ongoing activity are illustrated in this contribution. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: diagnostic analysis; non-destructive testing; simulation models; pipelines. 1. Introduction European energy needs are partly covered by hydrocarbons transported through a wide long distance network of pipelines. The main gas supplies originate from fields located in Saharan Countries and in the former Soviet Union (Pirani and Yafimava, 2016). Thus, the pipes are either exposed to a peculiar environment or exercised since a rather long time. © 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.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers. * Corresponding author. Tel.: +39-02-2399-4319; fax: +39-02-2399-4300. E-mail address: gabriella.bolzon@polimi.it * Corresponding author. Tel.: +39-02-2399-4319; fax: +39-02-2399-4300. E-mail ad ress: gabriella.bolzon@polimi.it

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 B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.107