PSI - Issue 11

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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. 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 Iconic crumbling of the clock tower in Amatrice after 2016 central Italy seismic sequence: advanced numerical insight M. Poiani a *, V. Gazzani a , F. Clementi , G. Milani b , M. Valente b , S. Lenci a a Department of Civil and Building Engineering, and Architecture, Polytechnic University of Marche, Via Brecce Bianche, 60131, Ancona, Italy b Department of Architecture, Built Environment and Construction Engineering ABC, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milan, Italy, Abstract The present paper investigates from an advanced numerical point of view the progressive damage of the Amatrice (Rieti, Italy) civic clock tower, after a long sequence of strong earthquakes that struck central Italy in 2016. Two advanced numerical models are here utilised to have an insight into the modalities of progressive damage and the behaviour of the structure under strong non linear dynamic excitations, namely a Non-Smooth Contact Dynamics (NSCD) and a FE Concrete Damage Plasticity (CDP) models. In both cases, a full 3D detailed discretization is adopted. From the numerical results, both the role played by the actual geometries and the insufficient resistance of the constituent materials are envisaged, showing a good match with actual crack patterns observed after the seismic sequence. Copy ight © 2018 Elsevier B.V. All rights reserved. Peer-revi w under responsibility of the CINPAR 2018 organizers Keywords: Non-linear dynamic analyses; Non-Smooth Contact Dynamics method; Concrete Damage Plasticity model; Masonry tower. 1. Introduction The seismic events, which hit Central Italy on 24 th August 2016, 26 th and 30 th October 2016 and 18 th January 2017, have caus d casualties a d significant damage mostly to buildings and architectural heritage of the Italian regions of Marche, Lazio, Abruzzo and Umbria. The mainshock occurred on 24 th August at 3:36 am (local time) with epicentre close t Accumoli (Rieti province) and with a magnitude M w = 6.2; it was foll wed, at 4.33 am, by an aftershock with XIV International Conference on Building Pathology and Constructions Repair – CINPAR 2018 Iconic crumbling of the clock tower in Amatrice after 2016 central Italy seismic sequence: advanced numerical insight M. Poiani a *, V. Gazzani a , F. Clementi a , G. Milani b , M. Valente b , S. Lenci a a Department of Civil and Building Engineering, and Architecture, Polytechnic University of Marche, Via Brecce Bianche, 60131, Ancona, Italy b Department of Architecture, Built Environme t and Construction Engineeri g ABC, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Mila , Italy, Abstract The present paper investigates from an advanced numerical point of view the progressive damage of the Amatrice (Rieti, Italy) civic clock tower, after a long sequence of strong earthquakes that struck central Italy in 2016. Two advanced numerical models are here utilised to have an insight into the modalities of progressive damage and the behaviour of the structure under strong non linear dynamic excitations, namely a Non-S ooth Contact Dynamics (NSCD) and a FE Concrete Damage Plasticity (CDP) models. In both cases, a full 3D detailed discretization is adopted. From the numerical results, both the role played by the actual geo etries and the insufficient resistance of the constituent materials are envisaged, showing a good match with actual crack patterns observed after the seismic sequence. Copyright © 2018 Elsevier B.V. All rights reserved. Peer-review under responsibility of the CINPAR 2018 organizers Keywords: Non-linear dynamic analyses; Non-Smooth Contact Dynamics method; Concrete Damage Plasticity model; Masonry tower. 1. Introduction The seismic events, which hit Central Italy on 24 th August 2016, 26 th and 30 th October 2016 and 18 th January 2017, have caused casualties and significant damage mostly to buildings and architectural heritage of the Italian regions of Marche, Lazio, Abruzzo and Umbria. The mainshock occurred on 24 th August at 3:36 am (local time) with epicentre close to Accumoli (Rieti province) and with a magnitude M w = 6.2; it was followed, at 4.33 am, by an aftershock with © 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. E-mail address: m.poiani@pm.univpm.it * Corresponding author. E-mail address: m.poiani@pm.univpm.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.

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.2018.11.041