PSI - Issue 2_B

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 Struc ural Integrity 2 (2016) 2263–2268 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Improved Zn-based coatings for ipersandelin steel products Giovanni Fortese a , Andrea Carpinteri a , Vittorio Di Cocco b , Francesco Iacoviello b , Stefano Natali c , Camilla Ro chei a , Daniela Scorza a , Sabrina Vantadori a * a DICATeA - Università degli Studi di Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy b DICeM - Università di Cassino e del Lazio Meridionale, Via G. Di Biasio 43, 03043 Cassino (FR), Italy c DICMA - U iversità di Roma “La Sapienza”, via Eudossi na 18, 00184 Rome, Italy Abstract The protection of iron-based alloy products against corrosion is fundamental to preserve their mechanical properties in aggressive environments. Hot-dip galvanizing process represents one of the most used techniques to make protective coatings for such products. In order to improve both mechanical and chemical properties of coating, metallic elements may be added to the traditio al zinc bath. In the presen paper, two types of improved zinc-based oating are propos d: (i) A coating obtained employing a tin addition (3% in weight); (ii) A coating obt ined employing aluminium (5% in w ight), tin (1% in weight) and copper (0.5% n weight) additions. Firstly, the performance f such two types of coatings s experimentally investigated through bending tests n ipersandelin steel plat specimens, treated through different ath dipping times. The intermetallic phase thicknesses of coatings are measured for each dipping time, in order to evaluate the kinetic formation. Then, a Finite Element (FE) model is proposed in order to simulate the bending behaviour of the above specimens, both employing the measured phase thickness and implementing the loading and boundary conditions of the experimental tests. A numerical non-linear static analysis is performed. A quite satisfactory agreement between experimental and numerical results is observed, especially under plastic behaviour regime. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Improved Zn-based coatings for ipersandelin steel products Giovanni Fortese a , Andrea Carpinteri a , Vittorio Di Cocco b , Francesco Iacoviello b , Stefano Natali c , Camilla Ronchei a , Daniela Scorza a , Sabrina Vantadori a * a DICATeA - Università degli Studi di Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy b DICeM - Università di Cassino e del Lazio Meridionale, Via G. Di Biasio 43, 03043 Cassino (FR), Italy c DICMA - Università di Roma “La Sapienza”, via Eudossiana 18, 00184 Rome, Italy Abstract The protection of iron-based alloy products against corrosion is fundamental to preserve their mechanical properties in aggressive environments. Hot-dip galv nizing pro ess represents one of the most used techniques to ake protective coati gs for uch products. In order to improve both mechanical and chemical properties of coati g, metallic elements may be added to the traditional zi c bath. In the present paper, two types of improved zinc-based coating are proposed: (i) A coating obtained employing a tin additio (3% in weight); i) A coating obtained employing aluminium (5% in weight), tin (1% in weight) and copper (0.5% in weight) additions. F rstly, th performanc f such two types of coat ngs is experimentally inves igated through bending tests on ipersandelin steel plate s ecim ns, tre ted thr g different bath dipping times. The intermetall c phase thi kne ses of coatings ar measured f r each dipping time, in order to evaluat the kinetic forma on. Then, a Finit Element (FE) odel prop sed in o de to simulate the ending behaviour of the above specime s, both empl ying the measured phase thickness and implem nt g th load ng and bound ry conditions of the experimental tests. A numerical non-li ear static analy is is performe . A quite satisfact ry agre ment between experimental and numerical results is observed, especially under plastic behaviour regime. © 2016 The Authors. Published by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Copyright © 2016 T e Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommon . rg/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: bending resistance, experimental test, intermetallic phase, numerical model, zinc coating. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: bending resistance, experimental test, intermetallic phase, numerical model, zinc coating.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +39 0521-905962; fax: +39 0521-905924. E-mail address: sabrina.vantadori@unipr.it * Corresponding author. Tel.: +39 0521-905962; fax: +39 0521-905924. E-mail address: sabrina.vantadori@unipr.it

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.283