PSI - Issue 1

ScienceDirect Procedia Structural Integrity 1 (2016) 134–141 Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Scie ceDirect Structural Integ ity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2016) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

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 Research on fatigue crack propagation in CT specimens subjected to loading modes I, II or III Paulo Chambel a , Rui F. Martins a, * Luís Reis b a UNIDEMI, Department of Mechanical and Industrial Engineering, Faculty of Scie ce and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Monte de Caparica, Portugal b IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract The main purpose of the research presented herein was to study the fatigue crack propagation under loading modes I, II or III, either for plane strain or plain stress state. Therefore, several finite element analyses (FEA) were carried out and some experimental tests were performed in a bi-axial servo-hydraulic machine. J-integral values were determined through numerical simulations and stress intensity factors, K I , K II and K III were inferred at the crack tip of both thick and thin C(T) specimens, assuming several crack’s lengths, and either for plane strain or plane stress state. Load opening-mode I shown to be the pred minant mode of crack propa ation u er plane-strain state, leading to t ighest J-in egral values c lculated, followed by Mod III. In a diti n, sh aring load (mode II) in uced the low st stress intensity fact r values at the crack tip bot for plane stress state and f r plane strain stat . Finally, some f tig e crack growth rates (FCG) w re etermined under loading modes I or III, for thin sp cimens, t room temperature. C(T) specim ns use in t e experimental t sts were made of two austenitic st inless steels, namely the AISI 316L and the Cr-Mn stainless steel, which are commonly used in several specific engineering applications. Results were compared and some conclusions could be drawn. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. a a b The main purpose of the research presented herein was to study the fatigue cr ck prop e Peer-rev he Copyright © 2015 The Authors. Published by Elsevier B.V. This is n pen 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: Fracture mechanics; Loading modes I, II, III; Plane strain or plane stress state; Fatigue Crack Growth Rates (FCGR); Experimental tests.

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +351-21-294-8567; fax: +351-21-294-8531. E-mail address: rfspm@fct.unl.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.2016.02.019