PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1116–1122 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Statistical A alysis of the Influence of Several Factors on Compressive Strength of Alkali Activated Fly Ash Adelaide Cerveira a, * , Elisete Correia b , Nuno Cristelo c , Tiago Miranda d , Fernando Castro e , Ana Fernández-Jiménez f a INESC – TEC and Department of Mathematics, UTAD, 5001-801 Vila Real, Portugal, cerveira@utad.pt b CM-UTAD and Department of Mathematics, UTAD c CQ-VR and Department of Engineering, UTAD d ISISE and Department of Civil Engineering, UMinho e W2V and Department of Mechanical Engineering, UMinho f duardo Torroja Institute for Construction Science, Madrid The use of indust ial by-products to produce new types of cement-sub titute binders is ga ning significant om ntum, esp ci lly through the alkaline activation technique. Howev r, the xact curing conditions that should be considered wi h each bind r variation have not yet been fully understood. The aim of the present work is thus the statistical analysis of the effects of several factors, namely filler/precurso r tio and curing humidity, n e compressive strength of different mixtu s prepared with mi tailings (filler), fly sh (precursor) and an alkali activator based o sodium hydroxide. Five different typ s of mixture wer prepared, wit filler/precursor r ios of 80/20, 60/40, 40/60, 20/80 and 0/100. All the specimens w e cured at 80ºC for 7 days, aft r which they were submitte to a uniaxial compression strength (UCS) es . Three different values o curing humidity were considered, nam ly 25%, 50% and 75%. Each UCS value was the average of 9 different spec mens t sted. The aim of the present research is t establish how much these two factors (inert/precursor ratio and curing humidity) influence the UCS. For that purpose, a two- way Analysis of Variance (ANOVA), with interaction, was performed; followed by a Tuckey’s Post hoc test. The res lts showed tatistically significant differences for at least one humidity value F(2,127) = 31.647 (p<0.001) – as well as one inert/precur or ratio – F(4,127) = 371.64; (p<0.001) and for interaction F(8,127) = 9.33; (p<0.001). To evaluate which level or levels are different a Tuckey’s Post hoc test was performed. This test revealed that the humidity value of 50% presented statistically significant differences regarding the remaining two values. In addition, it was concluded that this humidity value (50%) © 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.: +351-259350818. E-mail address: cerveira@utad.pt

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.099 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.