PSI - Issue 11

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedi Structural Integrity 11 8 84–9 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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. XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018 Study of propagation of ultrasonic pulses in concrete exposed at high temperatures Alisson Rodrigues de Oliveira Dias a, *, Felipe Alves Amancio b , Maria Fabíola de Carvalho Rafael c ,Antônio Eduardo Bezerra Cabral d a,b,c,d Federal University of Ceará, Department of Structural Engineering and Civil Construction, Fortaleza, 60455-760, Brazil The concrete exposed to high temperatures, as in the case of fires, can undergo significant physico-chemical changes and loss of durability, through he appearing of cracks, spalling and a gradual deteriorat on of the hardened cement paste. In this sense, the present work aims to study the effects of concrete exposure at high temperatures on the propagation velocity of ultrasonic pulses. For this, were prepared concrete test specimens with different fck (20, 30, 40 and 50 MPa), exposed to temperatures of 200°, 400°, 600° and 800° C for 30 minutes, the ultrasonic pulse rate being measured before and after the exposure. In addition, an influence of the type of cooling (abrupt and natural) was verified. The results showed that there is only a significant difference in the reduction of the propagation of ultrasonic pulses starting at the temperature of 400 ° C, being the largest reduction factor for the concrete of 20 MPa. Regarding the type of cooling, a variance analysis of the data showed there is no significant difference in the reduction of the speed of ultrasonic pulses. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: Concrete; High temperature; Ultrasonic Pulse Velocity. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018 Study of propagation of ultrasonic pulses in concrete exposed at high temperatures Alisson Rodrigues de Oliveira Dias a, *, Felipe Alves Amancio b , Maria Fabíola de Carvalho Rafael c ,Antônio Eduardo Bezerra Cabral d a,b,c,d Federal University of Ceará, Department of Structural Engineering and Civil Construction, Fortaleza, 60455-760, Brazil Abstract The concrete ex osed to high temperatures, as in the case of fires, can undergo significant physico-chemical changes and loss f durability, through the appearing of cracks, spalling and a gradual deteriorati n of the hardened cement p ste. I this sense, the present work aims to study the effects of concrete exposure at high temperatures n t propagation v locity of ultrasonic pulses. For this, were prepared concrete test specimens with different fck (20, 30, 40 and 50 MPa), exposed to temperatures of 200°, 400°, 600° and 800° C for 30 minutes, the ultrasonic pulse rat being measured before and after the exposure. In addition, an influence of the type of cooling (abrupt and natural) was verified. The results show that there is only a significant difference i the red ction of the propagation of ultrasonic pulses starting at the temperat re of 400 ° C, being the largest redu tion factor for the concrete of 20 MPa. Re ardi g the type of cooling, a variance analysis of th data showed there is no significant difference in the reduction f the speed of ultrasonic pulses. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: Concrete; Hig temperature; Ultrasonic Pulse Velocity. 1. Introduction Civil engineering faces an immense challenge as a result of fire damage during the construction and service phases. In the last few years, the problems related to fire are frequently reported worldwide, seriously threatening personal and property safety (Ma et al., 2015). © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Civil engineering faces an immense challenge as a result of fire damage during the construction and service phases. In the last few years, the problems related to fire are frequently reported worldwide, seriously threatening personal and property safety (Ma et al., 2015). Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction

* Corresponding author. Tel.: 55 86 988532832. E-mail address: r odrigues_alisson@live.com * Corresponding author. Tel.: 55 86 988532832. E-mail ad ress: r odrigues_alisson@live.com

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 Copyright © 2018 Elsevier B.V. All rights reserved. Peer-revi w u er responsibility of the CINPAR 2018 organizers. 2452-3216 Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINP R 2018 organizers.

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

2452-3216 Copyright  2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers 10.1016/j.prostr.2018.11.012