PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 848–855 ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Fracture toughness of fibre-reinforced concrete determined by means of numerical analysis Patrizia Bernardi*, Elena Michelini, Alice Sirico, Sabrina Vantadori, Andrea Zanichelli Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy Abstract As is well-known, the addition of fibres to concrete mix (Fibre Reinforced Concrete, FRC) produces a positive effect on cracking behaviour. In this work, the results of an experimental campaign on FRC specimens with randomly distributed micro-synthetic polypropylene fibrillated fibres are examined. The tests concern single notched beams under three-point bend , where the fibre ontent vari s. Such an experimental testing is numerically analysed through a non-linear finite element model, named 2D-PARC, where a proper constitutive law for fibre-reinforced concrete is implemented. The load-crack mouth opening displacement (CMOD) curves numerically obtained are employed to determine the critical stress-intensity factor (fracture toughness) for different values of fibre content, according to the two-parameter model. The comparison between such numerical results and those obtained by applying the two-parameter model to the experimental load-CMOD curves is performed. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: critical stress-intensity fac or; FRC specimens; 2D-PARC; two-par meter mod l 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Fracture tough ess of fibre-reinforced concrete determined by means of numerical analysis Patrizia Bernardi*, Elena Michelini, Alice Sirico, Sabrina Vantadori, Andrea Zanichelli Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy Abstract As is well-known, the addition of fibres t concr te m x (Fibre R inforc d Co crete, FRC) produces a positive effect on cracking behaviour. In this work, t results of an experimental campaign n FRC specim ns with randomly distribut micro-synthetic polypropylene fibrillat d fibr s are examined. The tests cern single n tched b ams under th e-point bending, where the fibre ontent varies. Such an xperimental testing i ally analysed through a non-linear finite element model, named 2D-PARC, where a proper constitutive law for fibre-reinforced con rete is impl mented. Th loa -crack m uth ope ing displacement (CMOD) curves num rically obtained are employed to det rmine the critical stress-i tensity factor (fractur toughness) for different values of fibre content, according to the two-parameter model. The comparison between such numerical results and those obtained by applying the two-parameter model to the experimental load-CMOD curves is performed. © 2017 The Authors. Published by Elsevier B.V. P er-review under re ponsibility of the Scient fic C mmittee of ICSI 2017. Keywo ds: critical stress-intensity factor; FRC specim ns; 2D-PARC; two-paramete model © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Conventional or plain concrete is widely used in civil engineering practical applications due to its: (i) low production cost; (ii) excellent mechanical behaviour under compression; (iii) high form-fitting property to be casted 1. Introduction Conventional or plain concrete is widely used in civil engineering practical applications due to its: (i) low production cost; (ii) excellent mechanical behaviour under compression; (iii) high form-fitting property to be casted Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. 1. Introduction

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.090 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. * Corresponding author. Tel.: +39-0521-905709; fax: +39-0521-905924. E mail address: patrizia.bernardi@unipr.it * Corresponding author. Tel.: +39-0521-905709; fax: +39-0521-905924. E-mail address: patrizia.bernardi@unipr.it