PSI - Issue 11

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 11 (2018) 226–233 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 Effects of nonlinear modelling of the base-isolation system on the seismic analysis of r.c. buildings Fabio Mazza a, *, Rodolfo Labernarda a a Department of Civil Engineering, Università della Calabria, 87036 Rende (Cosenza), Italy Abstract Long-duration and high-amplitude horizontal velocity pulses are expected at sites located near an active fault; these are able to generate notable displacement at the level of the isolation system and pounding effects between closely spaced structural parts (e.g. in the case of an insufficient seismic gap between the elevator and building). A base isolated commercial building, recently built in the Sicilian town of Augusta, designed in line with the former Italian seismic code, is considered as test structure. In particular, an r.c. framed structure with rectangular plan, composed of a basement and three storeys above ground level, is seismically isolated with a hybrid system including sixteen high-damping-rubber bearings (HDRBs) and twenty steel-PTFE low friction flat sliding bearings (LFSBs). An elevator shaft with steel framed structure crossing the isolation level is also placed in non symmetrical way along the longitudinal axis. A comput r code for the nonlinear seismic analysis of base-isolated r.c. framed structures is improved by adding advanced nonlinear models of HDRBs and LFSBs. Finally, nonlinear dynamic analysis of the Augusta building is carried out with reference to near-fault earthquakes selected from the Pacific Earthquake Engineering Research center database and scaled in line with the design hypotheses adopted. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: r.c. framed building; steel framed elevator shaft; hybrid base-isolation system; pounding effects; nonlinear dynamic analysis. 1. Introductio Attention on the detrime tal effects of near-fault earthquakes on reinforced concrete (r.c.) base-isolated structures has been growing in recent years. Long-duration and high-amplitude horizontal velocity pulses are expected at sites Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018 Effects of nonlinear modelling of the base-isolation system on the seismic analysis of r.c. buildings Fabio Mazza a, *, Rodolfo Labernarda a a Department of Civil Engineering, Università della Calabria, 87036 Rende (Cosenza), Italy Abstract Long-duration and high-amplitude horizontal velocity pulses are expected at sites located near an active fault; these are able to generate notable displacement at the level of the isolation system and pounding effects between closely spaced structural parts (e.g. in the case of an insufficient seismic gap between the elevator and building). A base isolat d commercial building, rec ntly bu lt in the Si ilian tow f August , designed in line with the former Italian seismic de, is onsidered as test struct re. In parti ul r, an r.c. framed structure with rectangular plan, composed of a basement and thre storeys above ground level, is seismically isolated with a hybrid system including sixte n high-damping-rubber bearings (HDRBs) and twenty steel-PTFE low friction flat sliding bearings (LFSBs). A elevator shaft with steel framed structure crossing the isolation level is also placed in non symmetrical way along the longitudinal axis. A comput r code for the nonlinear seismic analysis of base-isolated r.c. framed structures is improved by adding advanced nonlinear models of HDRB and LFSBs. Finally, nonlinear dynamic analysis of the Augusta building is carried out with reference to near-fault earthquakes selected from the Pacific Earthquak En ineering Research cent r database and scaled in line with the design hypotheses adopted. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: r.c. framed building; steel framed elevator shaft; hybrid base-isolation system; pounding effects; nonlinear dynamic analysis. 1. Introduction Attention on the detrimental effects of near-fault earthquakes on reinforced concrete (r.c.) base-isolated structures has been growing in recent years. Long-duration and high-amplitu e horizontal velocity pulses are expected at sites © 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.: +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. * Corresponding author. Tel.: +39-0984-496908; fax: +39-0984-494045. E-mail address: fabio.mazza@unical.it * Corresponding author. Tel.: +39-0984-496908; fax: +39-0984-494045. E-mail address: f bio.mazza@unical.it

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 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers 10.1016/j.prostr.2018.11.030