PSI - Issue 11

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ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedire t.com Scie ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 11 (2018) 298–3 5 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 Numerical study on the reduction of the seismic vulnerability of historical industrial buildings with wide timber roofs Natalino Gattesco a , Ingrid Boem b * a University of Trieste, piazzale Europa 1, Trieste 34127, Italy b University of Trieste, piazzale Europa 1, Trieste 34127, Italy Abstract In the paper are presented the results of a preliminary numerical study concerning the evaluation of the effectiveness of interventions for the reduction of the seismic vulnerability of buildings with traditional multiple sloping timber roofs laid on masonry walls along the building perimeter and on columns internally. In particular, the effects of three different strengthening strategies are analyzed: the bracing of the roof diaphragm by means of wooden-based nailed panels, the addition of steel portal frames and the reinforcement of the masonry through the application of a mortar coating with composite meshes embedded. To take into account the different interventions effects, a simplified numerical procedure, based on no -linear-static analysis, is proposed and a case study is analyzed numeric lly to compare, in terms of resistant gr und acceleration, a g,res , the effects of the diff rent reinforcement te niqu s. Typically, the absence of the roof diaphragm determin s the out-of-plane coll pse of the longitudinal walls, fo very low seismic actions. Th roof stiffening induc s a redist ibution of the seismic load from the longitudi al walls to the ransversal ones; however, as they are not dimensioned for hor zontal loads, very modest ben fits emerged in terms of a g,res . The addition of two steel portal fr mes or the reinforcement of the walls with the reinforced mortar t chnique permits to reach values of the resistant acceleration considerably higher than that of the unreinforced configuration (1.91 and 2.73 times higher, respectively). Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Copyright © 2018 Elsevier B.V. All rights r served. Peer-review under responsibility of the CINPAR 2018 organizers XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018 Numerical study on the reduction of the seismic vulnerability of historical industrial buildings with wide timber roofs Natalino Gattesco a , Ingrid Boem b * a University of Trieste, piazzale Europa 1, Trieste 34127, Italy b Abstract In the paper are presented the results of a preliminary numerical study concerning the evaluation of the effectiveness of i terventions for the reduction of the eismic vulnerability of buildings with traditio al multiple sl ping imb r roofs laid n masonry walls along the building perimeter and o columns internally. In particular, the effects of three different strengthening strategies are analyzed: the bracing of the oof diaphrag by m a s of wooden-based nailed panels, th additio of steel portal fram and the reinforcem nt of the masonry throug the application of a mortar coating with composit meshes embedded. To take into account the diff rent int rventions effects, a sim lified umerical pro edure, based n non-linear-static analysis, is proposed nd a cas s udy is analyzed numerically to compare, in ter s of resistant ground acceleration, a ,res , the effects of he differ nt reinfor ement techniq es. Typically, th absence of he roof diaphragm de ermin s the out-of-plane collapse f longitudinal walls, for very low seismi actions. Th roof stiffeni g induces a redistribution of the seismic l ad from wal s to the transversal on s; however, as they are not dimens oned for horizontal loads, very modest benefits emerged in terms of a g,res . The addition of two steel portal frames or the reinforcement f the walls with the reinforc d mortar technique permits t reach valu s of the resistant acceleration conside ably highe than that of the unreinforced configuration (1.91 and 2.73 times higher, respectively). Copyright © 2018 Elsevier B.V. All rights reserved. Peer- eview under responsibility of the CINPAR 2018 organizers

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Type your keywords here, separated by semicolons ; Keywords: Type your keywords here, separated by semicolons ;

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

* Corresponding author. Tel.: +39-040-5583840. E-mail address: boem@dicar.units.it * Corresponding author. Tel.: +39-040-5583840. E-mail ad ress: boem@dicar.units.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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