PSI - Issue 11

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ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 11 (2018) 347–354 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Development and characterization of a system for the seismic and energy retrofit of existing buildings Valentina Pertile a, *, Lorenzo De Stefani a , Roberto Scotta a a Department of Civil, Environmental and Architectural Engineering, University of Padova, Via Marzolo 9, Padova 35131, Italy Abstract The integrated retrofitting of building heritage is a high interesting topic in Europe lately. Many calls of the researching program H2020 is focused on this topic. This work deals with a new technology that improve seismic and energetic performance of existing buildings by operating only on the outer surface. The system consists in two layers of insulating material and between them a seismic resistant layer made with in-situ cast concrete. The structural connection is made with steel screws fixed on the existing structure and embedded in the cast concrete. The resistance and the stiffness are improved, the displacement is reduced and so is the damage of the existing structural elements. The building vulnerabili y is then reduced. Analytical and numerical studies were carried out to assess the structural seismic performance. First a feasibility study has been conducted, analyzing different geometric confi urations and boundary conditions. A alytical and numerical buckling analysis f thin concrete slabs were performed, and the results are presented. Then a sensitivity analysis was conducted to determine the sizing of retrofitting to the change in the intensity of seismic action and the height of the building. Referring to the numerical and analytical results, a set of quasi-static cyclic tests on real-scale specimens was performed and the results are presented. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: seismic retrofitting; existing buildings; energy efficiency; buckling. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility f the CINPAR 2018 organizers XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018 Development and characterization of a system for the seismic and energy retrofit of existing buildings Valentina Pertile a, *, Lorenzo De Stefani a , Roberto Scotta a a Department of Civil, Environmental and Architectural Engineering, University of Padova, Via Marzolo 9, Padova 35131, Italy Abstract The integrated retrofitting of building heritage is a high interesting topic in Europe lately. Many calls of the researching program H2020 is focused on this topic. This work deals with a new technology that improve seismic and energetic performance of existing buildings by operating only on the outer surface. The system consists in two layers of insulating material and b tween them a seism c resistant layer made with in-situ cast concrete. he structural connection is made with steel screws fixed on the existing structure and embedded in the cast concrete. The resistance and the stiffness are improved, the displacement is reduced and so is the damage of the existing structural elements. The building vulnerability is then reduced. Analytical and numerical studies were carried out to assess the structural seismic performance. First a feasibility study has been conducted, analyzing different geometric configurations and boundary conditions. Analytical and numerical buckling analysis of thin concrete slabs were performed, and the results are presented. Then a sensitivity analysis was conducted to determine the sizing of retrofitting to the change in the intensity of seismic action and the height of the building. Referring to the numerical and analytical results, a set of quasi-static cyclic tests on real-scale specimens was performed and the results are presented. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: seismic retrofitting; existing buildings; energy efficiency; buckling.

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

* Corresponding author. Tel.: +39-049-8275619. E-mail address: valentina.pertile@dicea.unipd.it * Corresponding author. Tel.: +39-049-8275619. E-mail address: valentina.pertile@dicea.unipd.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 CINPAR 2018 organizers.

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