PSI - Issue 8

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 8 (2018) 192–203 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Aut ors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of AIAS 2017 International Conference on St ess Analysis AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Evaluation of fatigue damage with an energy criterion of simple implementation C. Braccesi a , G. Morettini a * , F. Cianetti a , M. Palmieri a a University of Perugia - Department of Industrial Engineering, Via G. Duranti, 64 - 06125 Perugia. Abstract Many theoretical methods for multiaxial fatigue life prediction are present in literature, most of them based on their effectiveness on knowledge of the entire stress time history. This represents the great applicative limit. The incapacity to study real situations, not only determinis ic one, let the authors to develop a simple and rigorous criterion, which helps the designer who works in this area. The criterion is presented focusing the attention on the basic premise, highlighting its applicability, its practicality and its computational power. To do that, the Authors take into account the deterministic or random character of the individual constraint components and their degree of correlation. In order to verify the method, simulations of multiaxial loads conditions, developed in the time domain, will be carried out with various correlation levels between the stress components on which the method will be applied. © 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: Multi-Axial Fatigue; Fatigue Damage in Frequency Domain; Energy Method for Multi-Axial Fatigue; Deterministic or Random stress componet ; correlated or not-correlated stress compnent. 1. Introduction Assessing the fatigue damage of tress on components by multiaxial phenomena is of fundamental importance for the designer to ay. The great variety a d combinations of the stress components have made it clear that this phenomenon is extremely complex, Garud (1981). Defining the potential evolution over time of the stress tensor AIAS 2017 International Conference on Stress Analysis, AIAS 2017, 6-9 September 2017, Pisa, Italy Eval ation f fatigue damage with an energy criterion of simple implementation C. Braccesi a , G. Morettini a * , F. Cianetti a , M. Palmieri a a University of Perugia - Department of Industrial Engineering, Via G. Duranti, 64 - 06125 Perugia. Abstract Many theoretical m thods for multiaxial fatigue life prediction ar present in literature, most of them based on their effectiveness on knowledge of the entire stress time history. This represents the great applicative limit. The incapacity to study real situations, not only deterministic one, let the a thors to develop a simple and rigorous criterion, which hel s the designer who works i this area. The criteri n is presented focusing the attention on the basic premise, highlighting its applicability, its practicality and its utation l power. To do that, th Authors take into account the deterministic r random char cter of the individual constraint components and their degree of c rrelation. In rder to verify the method, simulations of multiaxial loads conditions, developed in the time domain, will be carried out with various correlation levels between the stress components on which the method will be applied. © 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: Multi-Axial Fatigue; Fatigue Damage in Frequency Domain; Energy Method for Multi-Axial Fatigue; Deterministic or Random stress componet ; correlated or not-correlated stress compnent. 1. Introduction Assess ng the fatigue damage of stress on co ponents by multiaxial phenome a is of fundamental importance for the designer today. The great variety and combinations of the str ss components have ade it clear that this phenomenon is extremely compl x, Garud (1981). Defining the potential evolution over time of the stress tensor © 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.

* Giulia Morettini. Tel.: +39-329-003-9720. E-mail address: morettinigiulia@gmail.com * Giulia Morettini. Tel.: +39-329-003-9720. E-mail address: morettinigiulia@gmail.com

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.2017.12.021