PSI - Issue 11

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ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Scie ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedi Structural Integrity 11 8 2 –27 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 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. XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018 A specific out-of-plane model for the dynamic analysis of masonry façades and estimation of cumulative seismic damage Siro Casolo a *, Giuseppina Uva b a Politecnico di Milano, P.le Leonardo da Vinci 131, 20131 Milano, Italy b Politecnico di Bari, Via E. Orabona 4, 70126, Bari, Italy The seismic damage suffered by masonry buildings, especially historical monuments, depends on a multiplicity of factors that determine their structural vulnerability and, of course, on the seismic hazard. Engineering approaches need a manageable and effective modeling of these aspects, but it is hard to admit that hazard and vulnerability can be easily synthesized by scalar measures. An advanced and rationale approach for the assessment needs to manage the mechanical complexity of masonry, whose seismic perform nce depends on the overall structural geometry; the masonry texture, often consisting of multiple layers; quality of blocks and mortar. It must also cope with the manifold dynamic features of earthquakes, including: amplitude of ground acceleration; freq ency content; duration of the most intense part. Furthermore, it should be cons dered the possible occurrence of destructive ev nts in a close sequence, which s instead rarely considered. The numerical tudy of these aspects r quires extensive nonlinear dynamic nalyses by means of specific models. Restricting th attention to the out-of-plane r spons of church façades, the paper presents the backgro nd and choices adopted in the formulation of a computational heuristic m del that m nages the hysteretic mechanical response by accounting for internal texture. It is shown that it is essential to carry out dynamic analyses to understand the different damage mechanisms and contribution of higher vibration modes. Finally, the availability of a model with excellent computational performance is exploited to study the cumulative damage in the case of a sequence of destructive seismic events. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Copyright © 2018 Elsevier B.V. All right reserved. Peer-review under responsibility of the CINPAR 2018 organizers XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018 A specific out-of-plane model for the dynamic analysis of masonry façades and estimation of cumulative seismic damage Siro Casolo a *, Giuseppina Uva b a Politecnico di Milano, P.le Leonardo da Vinci 131, 20131 Milano, Italy b Politecnico di Bari, Via E. Orabona 4, 70 26, Bari, Italy Abstract The seismic damage suffered by masonry buildings, especially historical monuments, depends on a multiplicity of factors that det rmine their structural vulnerability and, of course, on the seismic hazard. Engineering approaches need a manageable and effective modeling of these aspects, but it is hard to admit that aza d and vulnerability can be easily synthesize by scal r measures. An ad anced and rationale approach for the assessment needs to m age th mechanical complexity of masonry, whose seismic performance depends the overall structural geometry; the masonry texture, often consisting of multiple layers; quality of blocks and mortar. It must also cope with the manifold dynamic features of earthquakes, includi : a plitud of ground acceleration; frequency content; duration of the most intense part. Furthermor , it should be considere the possible occurrence of destructive events in a close seq ence, which is instead rarely considered. The numerical study of the e as ects r quires extensive n nlinear dynamic analys s by means of specific mo els. Restricting the attention to the o t-of-plane response of church façades, the aper presents the background and choices adopted in the formulation of a computational heuristic model that manages the hysteretic m chanical response by accounting for internal texture. It is shown that it is essenti l to carry out dynamic analys s to understand th different damag mechanisms and contribution of higher vibration modes. Finally, the availability of a model with excellent computational performance is exploited to study the cumulative damage in the case of a sequence of destructive seismic events. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: Masonry, Dynamics, Cumulative Seismic Damage, Repeated Earthquake, out-of-plane, Rigid Body and Spring Model - RBSM © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Masonry, Dynamics, Cumulative Seismic Damage, Repeated Earthquake, out-of-plane, Rigid Body and Spring Model - RBSM Abstract

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +39-02-23994356. E-mail address: siro.casolo@polimi.it * Corresponding author. Tel.: +39-02-23994356. E-mail ad ress: siro.casolo@polimi.it

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 Copyright © 2018 Elsevier B.V. All rights reserved. Peer-revi w u er responsibility of the CINPAR 2018 organizers. 2452-3216 Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINP R 2018 organizers.

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