PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1027–1034 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Fatigu Life Evaluation of Critical Details of the Hercílio Luz Suspension Bridge Z. Liu a , M.H. Hebdon a *, J.A.F.O. Correia b † , H. Carvalho c , P. Vilela c , A.M.P. De Jesus b , R.A.B. Calçada b a Charles E. Via Jr. Department of Civil & Environmental Engineering, Virginia Tech, Blacksburg, VA 24061, United States b University of Porto, Engineering Faculty, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal c Federal University of Minas Gerais, Dept. of Structural Engineering, 31270-901 Belo Horizonte, Minas Gerais, Brazil Fatigue assessment of existing bridges is increasingly prominent due to the advanced age and larger traffic demands. The Hercílio Luz Bridge (HLB), which was built in 1926, was closed to traffic in 1991 due to high corrosion levels and deterioration of critical structural elements. A complete rehabilitation project was developed for the bridge which included the replacement of the compromised members and strengthening of the foundations. In this paper, a fatigue life evaluation was carried out using fatigue load models 3 of the Eurocode EN 1991-2 to obtain the calculated stress ranges for the critical members of the bridge, as well as the simplified equivalent stress range and fatigue damage accumulation method for the fatigue safety verification defined by Eurocode EN 1993-2 and Eurocode EN 1993-1-9. Fatigue provisions, such as such truck geometry, S-N curves, fatigue category, etc., are reviewed. The evaluation results reveals that the stringer-to-floor-beam connections near the transition point of the eyebar chain are susceptible to fatigue damage. Besides, the number of cycles caused by a single truck prescribed in Eurocode is conservative. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Fatigue assessment; Eurocode; AASHTO; Comparative study; Hercílio Luz Bridge Z. Liu , M.H. Hebdon a b c c Structural Engineering, 31270-901 Belo Horizonte, Minas Gerais, Braz tible to fatigue damage. Bes d by single truck prescribed in Eurocode is © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 Abstract

© 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.: +540-231-6753. E-mail address: mhebdon@vt.edu † Corresponding author. Tel.: +351-966559442. E-mail address: jacorreia@inegi.up.pt

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.063 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.