PSI - Issue 3

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 Structu al Integrity 3 (2017) 579–587 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000–000 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. Copyright © 2017 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 IGF Ex-Co. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy Estimation of the damage in doubly notched A36 steel specimens, as a function of th redu tion rate of N f under a loading level Δ σ Jilali Nattaj a *, Fatima Majid b , Hassan Chaffoui c , Mohamed El Ghorba a Laboratory Of Atmosphere’s Physics and Modeling, FST Mohammadia, Hassan II University Of Casablanca b Laboratory Of Control and Mechanical Characterization Of Materials And Structures, National Higher School Of electricity And Mechanics (ENSEM), Hassan II University Of Casablanca c Laboratory Of Atmosphere’s Physics and Modeling, FST Mohammadia, Hassan II University Of Casablanca Abstract In this paper, which is a part of a whole series of researches, we deal with the study of a damage approach of an A36 steel material subjected alternately to fatigue and static tests. The aim is to quantify the material residual resistance under controlled cyclic loading with R = -1. Indeed, the prediction of the lifetime of ordinary A36 steel by using the method based on the rate of reduction of the number of cycles at break (RRCB) corresponding to a given loading level has been detailed. Then, the developed method has been compared to the damage approach using the unified theory. Furthermore, the experimental results have been obtained from fatigue tests on doubly notched specimens, combined to static tests results. The calculated values are analysed, discussed and compared. These approaches will allow us both to quantify the impact of unexpected damage on the lifetime of A36 steel and to predict its residual lifetime or even improve it. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. Keywords: Steel A36; reliability; damag ; un fied theory; f tigue; propag tion; notch; RRCB. XXIV Italian Group of Fracture Conference, 1-3 March 2017, Urbino, Italy Estimation of the damage in doubly notched A36 steel specimens, as a function of the reduction rate of N f under a loading level Δ σ Jilali Nattaj a *, Fatima Majid b , Hassan Chaffoui c , Mohamed El Ghorba a Laboratory Of Atmosphere’s Physics nd Modeling, FST Mohammadia, Hassan II U ivers ty Of Casablanca b Laboratory Of Control and Mechanical Characterization Of Materials And Structures, N tional Higher School Of electricity And Mec ani s (ENSEM), Hassan II University Of Ca ablanca c Laboratory Of Atmosphere’s Physics and Modeling, FST Mohammadia, Hassan II University Of Casablanca Abstract In this paper, which is a part of a wh le seri s of researches, we de l w th the study of a damage approach of an A36 steel materia subje ted alter ately to fatigue and sta ic tests. The aim is to quantify the material residual re stanc under controlled cyclic loading with R = -1. Indeed, the prediction of the lifetime of o dinary A36 steel by using the method bas d on the rate of reduction of the number of cycles at break (RRCB) corresponding to a given load ng level has been detailed. Then, th developed method has ee compared o the damage approach using th unified theory. Furthermore, he xperimental results have been obt ined from fatigue tests on doubly notched specimens, combined to static tes s results. The calculated values are analysed, d scuss d and compared. These approach wil allow us both to quantify the impact of unexpected damage on the lifetime of A36 steel and to predict its residual lifetime or even improve it. © 2017 The Autho s. Published by Elsevier B.V. Peer-review und r responsibil ty of the Scientific Committee of IGF Ex-Co. Keywords: Steel A36; reliability; damage; unified theory; fatigue; propagation; notch; RRCB.

© 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. E-mail address: j.nattaj@gmail.com * Correspon ing author. E-mail address: j.nattaj@gmail.com

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IGF Ex-Co.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2017 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 IGF Ex-Co. 10.1016/j.prostr.2017.04.018