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) 168–171 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. A c mbin d experimental-numerical investigation of the failure mode of thin metal foils Gabriella Bolzon a *, Mahdieh Shahmardani a , Rui Liu b , Emanuele Zappa b a Department of Civil and Environmental Engineering, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy b Department of Mechanical Engineering, Politecnico di Milano, via La Masa 1, 20156 Milano, Italy Abstract A combined experimental and numerical analysis of the mechanical response of the thin aluminum foils employed in beverage packaging has been performed using 3D digital image correlation and non-linear finite element techniques. The present contribution focuses on the significant amount of out-of-plane displacements that develop in tensile tests as fracture propagates across the investigated specimens. The influence of this phenomenon on the actual failure mode of the considered metal samples is further discussed. © 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; mechan cal characteristics; indentation 1. Introduction Thin metal foils are employed in several technological fields related to the production of micro-devices, flexible electronics and beverage packaging (Read and Volinski, 2007; Wong and Salleo, 2009; Bolzon et al., 2015). In these applications, the metal thickness is of the order of a few microns or even less. The foil properties are influenced by the lamination proc sses and di fer from those of he corresponding bulk materials. In particular, the apparent material brittleness increases as the thickness is reduced. At the same time, thin samples are difficult to handle and their mechanical response is sensitive to local imperfections, size and geometric effects (Klein et al., 2001; Hu, 2003; Wang et al., 2003). Thus, for instance, the overall load versus displacement output recorded during uniaxial A combined experimental-numerical investigation of the failure mode of thin metal foils Gabriella Bolzon a *, Mah ieh Shahmardani a , Rui Liu b , Emanuele Zappa b a Department of Civil and Environmental Engineering, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy b Department of Mechanical Engineering, Politecnico di Milano, via La Masa 1, 20156 Milano, Italy Abstract A combined experimental and numerical analysis of the mechanical response of the thin aluminum foils employed in beverage packaging has been performed using 3D digital image correlation and non-lin ar finite element techniques. The pr sent contribution focus s on the significa t amount of out-of-plane displacements that d velop in t nsil tests as fracture pro agates across the i vestigated specime s. The influe ce of this phe omenon on the actual failure mod of the considered m tal sampl is further discu sed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of IGF Ex-Co. Keywo ds: p peline steel; material aging; mechanica characteristics; indentation 1. Introduction Thin metal foils are employed in several technological fields related to the production of micro-devices, flexible electro ics and beverag packaging (Read and Volinski, 2007; Wong and Salleo, 2009; Bolzon et al., 2015). In thes applicat ons, the m t l thickness is of the or er f a few microns or even less. The foil properties are influenced by the lam nation pr cesses and differ from those of the corresponding bulk mat rials. In particular, the apparent mat rial brittleness incr ases as th thi k ess i reduc d. At the same time, thin samples are difficult to handle a d their mechanical response i sensitive to local imperfections, size and g ometric eff cts (Klein et al., 2001; Hu, 2003; Wang et al., 2003). Thus, for ins ance, the ov rall l ad versus displacement output recorded during uniaxial © 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 © 2017 The Authors. Published by Elsevier B.V. Peer-review und r responsibility 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.2017.04.030