PSI - Issue 12

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 12 (2018) 457–47 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity 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. AIAS 2018 International Conference on Stress Analysis Dies for pressing metal powders to form helical gears Enrico Armentani a,* , Angelo Mattera b , Raffaele Sepe a , Luca Esposito a , Francesco Naclerio b , Gian Filippo Bocchini c a University of Naples Federico II, P.le V. Tecchio 80, 80125 Naples, Italy b Officine Meccaniche Pontillo S.r.l., Via Aquino, 84018 Scafati (SA) Italy c Powder metallurgy consultant, Rapallo, GE, Italy Abstract This work concerns the realization of dies to produce helical gea s by metal pow er compaction. Due to the helicoidal geometry of the cylindrical gears, the punch, in addition to the axial motion, must necessarily rotate to "cross" the die. The innovative idea is to design a perfectly functioning system that can generate any helix angle (  ) in the range of interest 0°-30°, using the simple contact between punch and die cavity during the rotation. First of all, the punch-die system was treated as a self-locking screw to determine the maximum ß-value at which punch could be clamped inside the die during pressing. The analysis encouraged the execution of experimental tests related to a die with  5°, obtaining excellent results. Subsequently, FEM (Finite Element Method) analyses were performed on the static behavior of the die, subjected to the pressures exerted by powder and shrink fitting ring, for three different  -values: 5°, 18° and 30°. The results obtained for the latter two angles were compared with those related to the die with  equal to 5°, considered valid thanks to experimentation, in order to theoretically verify the correct functioning even of dies with larger angles. © 2018 The Authors. Published by Elsevier B.V. This is an open access article un r the CC BY-NC-ND licens (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Confer nc n Stress Analysis. Keywords: Powder Metallurgy, Compaction, Die, FEM analysis, Interference, Shrink fitting, Sintered helical gears © 2018 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/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. AIAS 2018 International Conference on Stress Analysis Dies for pressing metal powders to form helical gears Enrico Armentani a,* , Angelo Mattera b , Raffaele Sepe a , Luca Esposito a , Francesco Naclerio b , Gian Filippo Bocchini c a University of Naples Federico II, P.le V. Tecchio 80, 80125 Naples, Italy b Officine Meccaniche Pontillo S.r.l., Via Aquino, 84018 Scafati (SA) It l c Powder metallurgy consult nt, Rapallo, GE, It ly Abstract This work concerns the realization of dies to produce helical gears by metal powder compaction. Due to the helicoidal geometry of the cylindrical gears, the punch, in addition to the axial motion, must necessarily rotate to "cross" the die. The innovative idea is to design a perfectly functioning system that can generate any helix angle (  ) in the range of interest 0°-30°, using the simple contact between punch and die cavity during the rotation. First of all, the punch-die system was treated as a self-locking screw to determine the maximum ß-value at which punch could be clamped inside the die during pressing. The analysis encouraged the execution of experi ental tests related to a die with  5°, obtaining excellent results. Subsequently, FEM (Finite Element Method) analyses were performed on the static behavior of the die, subjected to the pressures exerted by powder and shrink fitting ring, for three different  -values: 5°, 18° and 30°. The results obtained for the latter two angles were compared with those related to the die with  equal to 5°, considered valid thanks to experimentation, in order to theoretically verify the correct functioning ev n of dies with larger angles. © 2018 The Authors. Published by Elsevier B.V. This is an open access ar icle under the CC BY-NC-ND license (http://creat v commons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of he Scientific Committee of AIAS 2018 International Conference on St ess Analysis. Keywords: Powder Metallurgy, Compaction, Die, FEM analysis, Interference, Shrink fitting, Sintered helical gears

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. * Corresponding author. Tel.: +39-081-768-2450; fax: +39-081-768-2172. E-mail address: enrico.armentani@unina.it * Co responding author. Tel.: +39-081-768-2450; fax: +39-081-768-2172. E-mail address: enrico.armentani@unina.it Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

2452-3216 © 2018 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/3.0/) Peer-revi w u er responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. 2452-3216 © 2018 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/3.0/) Peer-review u der responsibility of t Scientific ommitt e of AIAS 2018 Internati al Conference on Stress Analysis.

* 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 PCF 2016. 2452-3216  2018 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/3.0/) Peer-review under responsibility of the Scientific Committee of AIAS 2018 International Conference on Stress Analysis. 10.1016/j.prostr.2018.11.072