PSI - Issue 1

ScienceDirect Procedia Structural Integrity 1 (2016) 205–211 Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integ ity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Preliminary evaluation of the loading characteristics of biaxial tests at low and very high frequencies M. Vieira a *, L. Reis a , M. de Freitas a , A. Ribeiro a a IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract The very high cycle region of the S-N fatigue curve has been the subject of intensive research on the last years, with special focus on axial, bending, torsional and fretting fatigue tests. This can be achieved using ultrasonic exciters which allow for frequency testing of up to 30 kHz. Still, the multiaxial fatigue analysis is not yet developed for this type of fatigue analyses, mainly due to conceptual limitations of these testing devices. In this paper, a specimen is tested at 20 kHz on a bi-axial loading condition, with axial and torsional components on the specimen throat. The behavior of the specimen is measured by rotational and axial laser transducers at the bottom of the specimen and by strain gauges applied at its throat. Strain gauge data from very high frequency excitation is compared to strain gauge data obtained from equivalent specimen geometry at 0.5 Hz. Results indicate good correlation between both low and very high frequency tests. This data will serve as groundwork for future research on this field. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Very High Cycle Fatigue; Multiaxial Fatigue; High Frequency; Strain measurements 1. Introduction Fatigue damage has special rel vance on the ife span of mechanical components and structures, as it takes responsibility for the majority of the registered structural failures. Although its mechanisms have been the subject of continuous research, the growing ne d for greater lifespans forced the understanding of the behavior of materials under very high cycle loadings, also known as the Very High Cycle Fatigue (VHCF) regime. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Preliminary evaluati of th loading characteristics of biaxial tests at low and very high frequencies M. Vieira a *, L. Reis a , M. de Freitas a , A. Ribeiro a a IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract The very high cycle region of the S-N fatigue curve has been the subject of intensive research on the last years, with special focus on axial, bending, torsional and fretting f tigue tests. Thi can be achieved using ultrasonic exciters which llow for frequency testing of up to 30 kHz. Still, th multiaxial fatigue analysis is n t yet develop for this type of fatigue an lyses, mainly due o conceptual limitations of th se testing devi es. In t is paper, a spec men is t sted at 20 kHz on a bi-axial loadi g condition, with axial and torsional components on the specimen throat. The behavior of the specimen is me sure by tational and axial laser transducers at the bottom of he specimen nd by strain gauges appli d at its throat. Strain gauge data from very h gh frequency excitation is compared to strain gauge data obtained from equiv lent specimen geometry at 0.5 Hz. R sults i dicate good correlation between both low and very high frequency tests. This data will serve as groundwork for future research on this field. © 2016 The Authors. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Very High Cycle Fatigue; Multiaxial Fatigue; High Frequency; Strain measurements 1. Introduction Fatigue damage has special rel vance on the life span of mechanical co pone t and structures, a it takes respo sibility for t e majority of the registered s ructural failures. Al ough its mechanisms hav been the subj ct of continuous research, the growing need for greater lifespans forc d the nderstanding of the behavior of materials under very high cycle loadings, also known as the Very High Cycle Fatigue (VHCF) regime. 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. © 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.: +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 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. * Corresponding author. Tel.: +351 966415585; fax: +351 218417951. E-mail address: mario.vieria@ist.utl.pt; luis.g.reis@tecnico.ulisboa.pt * Corresponding author. Tel.: +351 966415585; fax: +351 218417951. E-mail address: mario.vieria@ist.utl.pt; luis.g.reis@tecnico.ulisboa.pt

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.2016.02.028