PSI - Issue 5

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 5 (2017) 195–201 Available online at www.sciencedirect.com 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 Corrosion effects on mechanical properties of sintered stainless steels C. Barile a, *, C. Casavola a , C. Pappalettere a a Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, viale Japigia 182, 70126 Bari, Italy Abstract This paper aims to analyse the effects of corrosion atmosphere on sintered stainless-steel specimens. In particular, it is intended to assess a relation existing between weight and corrosion resistance, density and corrosion resistance, tensile properties and corrosion resistance. Three groups of sintered stainless steels were studied. They differ, one from each other, for the laser power and for the speed scanning. For each group, nine specimens were made up. For all of them, measurements of both weight and density were carried out. One specimen of them was tested, as received, according to the tensile standard for metallic materials. Eight specimens for each class were placed in corrosive atmosphere in conducting the neutral salt spray (NSS) tests for assessment of the corrosion resistance of metallic materials. Four different periods of exposure were defined. At the end of each test period, two specimens were removed from the cabinet. Visual observations, measurements of mass loss, density variations and tensile tests was carried out on all the specimens referring to th specific exposure time, in rder to eva uat and record all the hanges referring to he specific conditions they were ubjected to. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scie tific Committee of ICSI 2017. Keywords: Corrosion atmosphere; Neutral salt spray; Powder metallurgy; 316L stainless steel; Selective laser melting; 1. Introduction High corrosion resistance, good visual aspect and good formability favored the use of stainless steels in several engineering fields, not only in mechanical industry but also in the building one (Bellezze et al. 2005). In particular, stainless teel powder metallurgy process has numerous advantag s to fabricate small pieces of complex shapes, 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Corrosion effects on mechanical properties of sintered stainless steels C. Barile a, *, C. Casavola a , C. Pappalettere a a Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, viale Japigia 182, 70126 Bari, Italy Abstract This paper aims to analyse the effects of corrosion atmosphere n si tered stainless- teel spe imen . I particular it i intended o assess a elati ex ti g betwe n weight and corrosion resistance, density an corrosion resistance, tensil properties and corrosion resistance. T ree groups f sintered stainless steels were studied. They iffer, one from each oth r, for the laser power and for the speed scanning. F r each group, ni e specimen wer m de up. For ll f them, measurement of both weight and density were carried out. O e specimen of them was test , as received, cc rding to the tensile standard for me allic materials. Eight specimens for each class were placed in corrosive atmosphere in conducting the neutral salt spray (NSS) tests for assessment of t e corros n resistance of metallic materials. Four differe t per ods f exposure were defin d. At the end of each test peri d, two specimen were removed fr m th cabinet. Visual observations, measur ments of mass loss, density variatio s and tensile tests wa carried out on all t e specimens r ferring to the sp ific exp sure time, in order to evaluate and record all the changes ref rring the specific onditions they were subj cted to. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Corrosion atmosphere; Neutral salt spray; Powder metallurgy; 316L stainless steel; Selective laser melting; 1. Introduction High corrosion resistance, good visu aspec and good formability favored the use of s inless steels in several engin ering fields, not only in mechanical industry but also in the building one (Bellezze et al. 2005). In particular stainless steel powder metallurgy process has numerous advantages to fabricate small pieces of complex shapes, © 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. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

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.2017.07.101 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th 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. * Correspon ing author. Tel.: +39-080-5962812; fax: +39-080-5962777. E-mail address: claudia.barile@poliba.it * Corresponding author. Tel.: +39-080-5962812; fax: +39-080-5962777. E-mail address: claudia.barile@poliba.it

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