PSI - Issue 1

ScienceDirect Procedia Structural Integrity 1 (2016) 181–188 Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integ ity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 il l li i i

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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 Methodology for assessing the probabilistic condition of an asset based in concepts of structural reliability “ PCBM - Probabilistic Condition Based Maintenance ” Fernando Teixeira a , Jánes Landre Junior b* a PUC MINAS, Pontifícia Católica de Minas Gerais, Av. Dom José Gaspar, 500, Belo Horizonte, Brasil b PUC MINAS, Po tifícia Católica de Minas Gerais, Av. Dom Jo é Gaspar, 500, Belo H rizonte, Brasil Abstract The purpose of this paper is to propose a methodology for assessing the probabilistic condition of an asset with the introduction of the concept of PCBM (Probabilistic Condition Based Maintenance) as an extension of the existing concept CBM (Condition Based Maintenance). The concepts of structural reliability and its methods will be used to evaluate the structural integrity of a mechanical system. The evaluatio will be held through the probability of failure of thi system and its reliability index. The system wi be subject to dynamic loads. From experimental results, sim lations will be performed and the correlations betw en the probab listic model and the d terministic will be conducted in order o verify the possibility of using this methodol gy to support th decision-making process. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Structural reliability, Fatigue, maintenance a , , . , , , b , , . , , , Abstract Peer-review under responsibility of the Scien , , 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. 1. Introduction 1

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. The structural reliability is a relatively new issue in terms of science, it has been developing rapidly in recent years. The first mathematical formulation in structural safety problems can be attributed to Mayer (1926), Streletskii (1947) and Wierzbicki (1936). They found that the strength and load parameters are random variables, therefore, for each frame, there is a failure probability associated.

* Corresponding author. Tel.: +55-31-3319-4910; fax: +55-31-3319-4910. E-mail address: janes@pucminas.br . . .

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* 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 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.2016.02.025