PSI - Issue 11

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ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 11 (2018) 185–193 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 Application of low-invasive techniques and incremental seismic rehabilitation to increase the feasibility and cost-effectiveness of seismic interventions Labò S. a *, Casprini E. a , Passoni C. a , Zanni J. a , Belleri A. a , Marini A. a , Riva P. a a Department of Engineering and Applied Science. University of Bergamo, Viale Marconi 5, 24044 Dalmine The high seismic risk connected to the existing construction heritage requires a wide-scale renovation action to ensure structural resilience and avoid future human and economic losses. Given the urgency and the scale of the problem and the lack of available resources, a new strategy for the renovation of the obsolete European building stock should be envisioned, accounting for both safety and environmental, social and economic sustainability. This research aims at exploring new cost-effective seismic retrofit solutions based on the principles of low-invasiveness and incremental seismic rehabilitation, as envisioned by FEMA P-420 (2009). The incremental rehabilitation approach allows to plan repair and retrofit actions along with the maintenance works expected during the building’s lifetime, thereby spreading them in time and reducin g costs. In addition, low-invasiveness of the solutions is required to reduce the impacts on the functionality of the building, thus cutting the costs connected to downtime. A possible solution is represented by the introduction of an exoskeleton entirely carried out from outside. In this paper, a new sustainable technique is proposed, where the existing structure is connected to a self-supporting exoskeleton adopting demountable dry techniques, which may be assembled and activated in different phases of the building lifetime. As a proof of concept, the approach is then applied to a school building. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers 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 Application of low-invasive techniques and incremental seismic rehabilitation to increase the feasibility and cost-effectiveness of seismic interventions Labò S. a *, Casprini E. a , Passoni C. a , Zanni J. a , Belleri A. a , Marini A. a , Riva P. a a Department of Engineering and Applied Science. University of Bergamo, Viale Marconi 5, 24044 Dalmine Abstract The high seismic risk connected to the ex sting co r ction heritage requires a wide-scale renovation action to ensure structural resilience and avoid future human and economic losses. Given the rgency and the scale of the problem and the lack of available r sources, a new strategy for the re ovation of the obsolete European building stock should be envisione , accounting for both safety and environmental, social and econ mic sustainability. This research aims at expl ring new cost-effective seismic retr fit olutions based on th principles of low-invasivene s a d incremental seismic rehabilitation, as e visioned by FEMA P-420 (2009). The incremental rehabilitation approach allows to plan repair and retrofit actions along with the maintenance works expected during the building’s lifetime, thereby spreading them in time and reducin g costs. In addition, low-invasiveness of the solutions is required to reduce the impacts on the functionality of the building, thus cutting the costs connected to downtime. A possible solution is represented by the intr duction of an exoskeleton entirely carried out from outside. In this paper, a new sustainable technique is proposed, where the existing structure is connected to a self-supporting exoskeleton adopting demountable dry techniques, which may be assembled and activated in different phas s of the building lifetime. As a proof f concept, the pproach is then applied to a school building. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: Incr mental ehabilitation; seismic retrofit; renovation strategy; low-invasive techniques; life cycle thinking; diagrid; school buildings. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Incremental rehabilitation; seismic retrofit; renovation strategy; low-invasive techniques; life cycle thinking; diagrid; school buildings. Abstract

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

* Corresponding author. Tel.: +39-035-2052345. E-mail address: simone.labo@unibg.it * Corresponding author. Tel.: +39-035-2052345. E-mail ad ress: sim ne.labo@unibg.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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