PSI - Issue 3

Available online at www.sciencedirect.com

Available online at www.sciencedirect.com

ScienceDirect

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 3 (2017) 172–175 ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 Structural Integrity Procedia 00 (2017) 000–000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy

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. Copyright © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. An indentation based investigation on the characteristics of artificially aged pipeline steels Gabriella Bolzon a *, Olha Zvirko b a Department of Civil and Environmental Engineering, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy b Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5 Naukova Street, 79060 Lviv, Ukraine The decay of the mechanical properties of structural components operating in an aggressive environment can be detected by non destructive indentation tests. The effectiveness of this approach has been verified on artificially aged pipeline steel. Indentation tests have been performed at different scales to verify the transferability of the laboratory results to the field conditions, in view of the possible development of in-situ diagnostic procedures. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Com ittee of IGF Ex-Co. Keywo ds: pipeline steel; material aging; mechanical charac erist cs; indentation 1. Introduction The severe working conditions of gas pipelines induce material degradation with increased risk of uncontrolled brittle failure and, therefore, significant economic losses and environmental consequences. The actual safety margins of these infrastructures depend on the evolution with time of their mechanical properties, which depend on a number of factors that include the materia composition, the environment conditions, the external loading (Gabetta et al., 2008; Nykyforchyn et al., 2010; Nykyforchyn et al., 2012). The reliable and timely assessment of the material status can be facilitated by the implementation of non destructive diagnostic procedures based on indentation tests. This fast and inexpensive experiment can be performed directly on the components, without the need of extracting material spools and working out specimens of pre-fixed An indentation based investigation on the characteristics of artificially aged pipeline steels Gabriella Bolzon a *, Olha Zvirko b a Department of Civil and Environmental Engineering, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy b Karpenko Physico-Mechanical I stitute of the National Academy of Sciences of Ukraine, 5 Naukova Street, 79060 Lviv, Ukraine Abstract The decay of the mechanical properties of structural components operating in an aggressive environment can be detected by non destructive indentation tests. The effectiveness of this approach has been verified on artificially aged pipeline steel. Indentation tests have been perf rm d at different scales to verify the transfer bility of the lab ratory results to the fi d conditions, i view of he possible devel pment of in-situ diagnostic p ocedures. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. Keywords: pipeline steel; material aging; mechanical characteristi s; indentation 1. Introduction The severe working conditions of gas pipelines induce material degradation with increased risk of uncontrolled brittle failure and, therefore, sig ificant economic losses and environmental consequences. The actual safety margins of h se nf astructures d pend on the evoluti n with time of their mechanical properties, which depend on a number factors that in l de the material compos tion, e environment condit ons, the external loa ing (Gabetta et al., 2008; Nykyforchyn et al., 2010; Nykyforchyn et al., 2012). The reliable and imely assessment of th material status can be facilitated by the implementation of non destructive diagnostic procedures bas d on ind ntation tests. This fast and inexp nsive experiment can be performed irectly on the c mponents, without the need of extrac ing material spools and working out sp cime s of p e-fix © 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

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review und r responsibil ty of the Scientific Committee of IGF Ex-Co. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. * 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 address: 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. Copyright © 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. 10.1016/j.prostr.2017.04.033