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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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Creep-Fatigue Crack Growth Testing and Analysis of Pre-strained 316H Stainless Steel Ali Mehmanparast a *, Catrin M. Davies b , Kamran Nikbin b a Offshore Renewable Energy Centre, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK b Mechanical Engineering Department, Imperial College London, South Kensington Campus, London SW7 2AZ, UK Abstract Material pre-straining is known to have significant effects of the mechanical response and crack growth behaviour of steels. In this paper, the influence of material pre-straining on the subsequent creep-fatigue crack growth behaviour of Type 316H stainless steel at 550 °C has been examined by performing tests on compact tension specimens that were extracted from blocks uniformly pre-compressed at room temperature. Creep-fatigue crack growth tests on pre-compressed material were performed at the frequency of 0.01 Hz and R-ratio of 0.1. The crack growth data obtained from these experiments have been correlated with the C* and K fracture mechanics parameters and the results are compared with the existing creep crack growth data on the pre compressed and as-received material at 550 °C. The results obtained have also been compared with the creep-fatigue data from experiments on weldments where the crack tip was located in the heat affected zone (HAZ). The crack growth behaviour in creep-fatigue tests on pre-compressed material has been found similar to that of HAZ material and are higher than that of the as received material. Moreover, depending on the loading condition and frequency the crack growth data obtained from creep fatigue tests on pre-compressed material may be characterized using C* or Δ K fracture mechanics parameters. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of he Scientific Committee of ECF21. Keywords: Cree-Fatigue interaction; Cree ; Fatigue; Crack Growth; Stainless Steel 1. Introductio Material pre-straining is often introduced into high temperature components during fabrication processes. These high temperature components, which can be made of stainless steels such as 316H that is widely used in the UK’s 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Creep-Fatigue Crack Growth Testing and Analysis of Pre-strained 316H Stainless Steel Ali Mehmanparast a *, Catrin M. Davies b , Kamran Nikbin b a Offshore Renewable Energy Centre, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK b Mechanical Engineering Department, Imperial College London, South Kensington Campus, London SW7 2AZ, UK Abstract Material pre-straining is known to have significant effects of the mechanical response and crack growth behaviour of steels. In this paper, the influence of material pre-straining on the subsequent creep-fatigue crack growth behaviour of Type 316H stainless steel t 550 °C has been examined by performing tests on compact tension specimens that ere xtracted from blocks uniformly pre-compressed t room te perature. Creep-fatigue crack growth tests on pre-compressed material were performed at the frequency of 0.01 Hz and R-ratio of 0.1. The crack growth data obtained from these experiments have be n correlated with t C* and K fracture mechanics parameters and the results are comp red with the existing creep crack growth data on the pre compressed nd as-received material at 550 °C. The results obtained have also been compared with the creep-fatigue data from experiments on weldments where the crack tip was located in th he t affected zone (HAZ). The crack growth b haviour in creep-fatigue tests on pre-compressed material has been found similar to that of HAZ material and are higher than that of the as rec ived material. Moreover, depending on the loadi g condition and frequency the crack growth data obtai ed from creep fatigu tests on pre-compressed material may be characterized using C* or Δ K fracture mechanics parameters. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: Cree-Fatigue interaction; Creep; Fatigue; Crack Growth; Stainless Steel 1. Introduction Material pre-straining is often introduced into high temperature components during fabrication processes. These high temperatu e components, which can b made of stainless steels such as 316H that is widely used in the UK’s Copyright © 2016 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 ECF21. © 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.: +44 (0) 1234 758331. E-mail address: a.mehmanparast@cranfield.ac.uk * Corresponding author. Tel.: +44 (0) 1234 758331. E-mail address: a.mehmanparast@cranfield.ac.uk

* 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 ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 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 ECF21. 10.1016/j.prostr.2016.06.101