PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structural Integrity 13 (2018) 1177–1182 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity Procedia 00 (2018) 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. ECF22 - Loading and Environmental effects on Structural Integrity The influence of aggregate grain size on the parameters of acoustic emission signals obtained from a three-point bending test on concrete specimens degraded by high-temperatures L ibor Topolář a, *, Šárk Keprdová a , Luboš Pazdera a a Brno University of Technology, Faculty of Civil Engineering, Veveří 331/95, Brno 602 00, Czech Republic One of the advantages of concrete when compared to other building materials is its fire resistance. Fire resistance of concrete structures depends on the thermal, mechanical and deformation properties of the used concrete. Some concrete structures can e exposed to extreme temperature conditions (e.g. concrete structures in nuclear power plants or in tunnels during fires). This paper presents the measurement results of a three-point bending test on three different mixtures of concrete specimens that have been exposed to high temperatures. The concrete specimens were heated in a programmable laboratory oven at a heating rate of 5 °C/min and were exposed to the following temperatures: 400 °C, 600 °C, 800 °C, 1000 °C and 1200 °C. The heating was maintained for 60 minutes. The obtained results indicate that the comparison of the absolute measured values is not sufficient. For this reason, the comparison of the individual mixtures is carried out using the relative values, which more clearly demonstrate the degree of damage to the concrete samples caused by exposure to elevated temperatures. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Acoustic emission method; three-point bending test; concrete; high-temperature; © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity The influence of aggregate grain size on the parameters of acoustic emission signals obtained from a three-point bending test on concrete specimens degraded by high-temperatures L ibor Topolář a, *, Šárka Keprdová a , Luboš Pazdera a a Brno University of Technology, Faculty of Civil Engineering, Veveří 331/95, Brno 602 00, Czech Republic Abstract One of the advantag s f concrete when compared to ther building materials is its fire resistance. Fire resistance of concrete structures depends on the thermal, mechanical and deformation p operties of the used concrete. Some concrete structures can b exposed to xtreme temperature conditions (e.g. concrete structures in nuclear power plants or in tunnels during fires). This paper presents the measure ent results f a three-point bending test on three different mixtures of concret pecimens that have be n exposed to high temp ratures. The concrete specime s were heat d in a programmable laboratory oven at a heating rate of 5 °C/min and were expos d to the f llowing t mperatures: 400 °C, 600 °C, 800 °C, 1000 °C and 1200 °C. The ti was maintained for 60 minutes. The btained results indicate that the comparison of the absolute me sured values is not sufficient. For this reas n, the comparison of the in ivid al mixtures is carri d ut using the relative values, which more clearly demonstrate the degre of damage to the concrete samples caused by exposure to elevated temp r tur s. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Acoustic emission method; thr e-point bending test; concrete; high-temperatur ; 1. Introduction Concrete is a universal building material with good resistance to the effects of the surrounding environment. Unlike other construction materials, concrete does not burn. It is resistant to smouldering materials, which can reach very high temperatures and start or even re-start a fire. Concrete cannot be ignited even by flames from other © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Concrete is a universal building material with good resistance to the effects of the surrounding environment. Unlike other construction materials, concrete does not burn. It is resistant to smouldering materials, which can reach very high temperatures and start or even re-start a fire. Concrete cannot be ignited even by flames from other Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction

* Corresponding author. Tel.: +420-541-147-664. E-mail address: Libor.Topolar@vutbr.cz * Corresponding author. Tel.: +420-541-147-664. E-mail ad ress: Lib . opolar@vutbr.cz

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers.

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

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.244