PSI - Issue 1

ScienceDirect Procedia Structural Integrity 1 (2016) 066–073 Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integ ity Procedia 00 (2016) 00 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Finite element prediction of stress-strain fields on sandwich composites R. Martins a , L. Reis a , R. Marat-Mendes a,b,* a IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b Department of Mechanical Engineering, ESTSetúbal, Instituto Politécnico de Setúbal, Estefanilha, 2914-761 Setúbal, Portugal Abstract The main objective of this study was the assessment of the stress-strain fields of the sandwich core during bending tests. Finite element models (FEM) using Siemens NX10 and digital image correlation (DIC) were used to predict the behavior of sandwich beams in 3 and 4 point bending. Two different core thickness and two different sandwich length (short and long beams) with basalt fiber reinforced polymer (BFRP) faces were simulated. The numerical simulation using 3D finite element were compared and validated with experimental results obtained previously by DIC. This work validated innovative numerical simulations and experimental techniques for determining stress-strain fields in composite sandwich beams subjected to bending. The correlation between experience and analysis allowed a better knowledge and understanding of the complex stress-strain fields along the core thickness of sandwich beams in be ding. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: FEM, Composite Sandwich beams, stress-strain fields, 3PB, 4PB 1. Introduction Structural sandwich panels consist of three main structural components: two flat or lightly profiled thin faces are bond d to relatively thick light cor . The strong and sti f thin faces provide flexural load bearing capacity and rigidity of the panel. The low density and flexible thick core with adequate shear strength and stiffness transfers shear loads between the two faces. The result is a composite structural element with relatively high load-bearing Peer-revi w und Copyright © 2015 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 PCF 2016. © 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.: +351265790000; fax: +351265790043. E-mail address: rosa.marat@estsetubal.ips.pt

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2015 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 PCF 2016. 10.1016/j.prostr.2016.02.010