PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 8 (2018) 517–525 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 © 2018 The Authors. Publis d by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Numerical model for the characterization of biocomposites reinforced by sisal fibres A. Pantano*, B. Zuccarello Università degli Studi di Palermo - Dipartimento DIID - Ingegneria Chimica, Gestionale, Informatica, Meccanica, Viale delle Scienze, 90128 Palermo Abstract Although several works have been recently published in literature about biocomposites, i.e. on innovative and ecofriendly polymer matrix composites reinforced by natural fibers, there are not studies on the influence of the waviness that various natural fiber present after their extraction. In order to give a contribution to the knowledge of the effects of the fiber waviness on the main mechanical properties of biocomposites, as the longitudinal Young modulus, in the present study a systematic numerical analy is has been carried out by using parametric models properly developed, that let the user to consider the effects of the key influence parameters as the fiber concentrations and the fiber curvature. Successive experimental studies have allowed to corroborate the accuracy of the numeri al results, as well as to highlight the local effects due to the fiber waviness, that in some cases can become more significant than the global effects analyzed by the numerical approach. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: biocomposites; agave; sisal fibres; finite element method; AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Numerical model for the characterization of biocomposites reinforced by sisal fibres A. Pantano*, B. Zuccarello Università degli Studi di Palermo - Dipartimento DIID - Ingegneria Chi ica, Gestionale, Informatica, Meccanica, Viale delle Scienze, 90128 Palermo Abstract Although several works have been rece tly published in literature about biocomposites, i.e. on innovative and ecofriendly polymer ma rix composites reinforced by natural fibers, there are ot s udies n the influence o the waviness that variou natural fiber pr sent after their extraction. In order to give a c tribution to the kn wledge of the eff cts of the fiber w viness on the main mechanical prop rties of biocom osites, as the longitudinal Young modulus, in the present study a syst matic num rical a alysis has been carried out by using parametric mo els prop rly de eloped, that let the us r to consider the effects of th key influence paramet rs as the fiber concen rations and the fiber curva ur . Successive experimental studies have allowed to orrobor te the accuracy of the num rical results, as well as to highlig t the local effects du to the ib r waviness, that in som cases can become more significant than the global effects a alyzed by the numerical approach. © 2017 The Autho s. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. Keywords: biocomposites; agave; sisal fibres; finite element method; © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Increasing att ntion to envir nm ntal protection from industrial pollution has raised interest in biomaterials, and in particular towards biocomposites, materials obtained usually by reinforcing renewable (biopolymeric) matrices by Increasing attention to environment l protection from industrial pollutio has raised interest in biomaterials, and in particular towards biocomposit s, materials obtai ed usually by r inforcing renewable (biopolymeric) matrices by Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction 1. Introduction

* Corresponding author. Tel.: +3909123897276. E-mail address: antonio.pantano@unipa.it * Correspon ing auth r. Tel.: +3909123897276. E-mail address: antonio.pantano@unipa.it

2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis. 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis.

* 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 Copyright  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on Stress Analysis 10.1016/j.prostr.2017.12.051