PSI - Issue 1

ScienceDirect Procedia Structural Integrity 1 (2016) 126–133 Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integ ity Procedia 00 (2016) 000 – 000 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. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Assessment of the fatigue life on functional hybrid laser sintering steel components J.A.M. Ferreira a, *, L.M.S. Santos a , J. da Silva a , J.M. Costa a , C. Capela a,b a CEMUC, Mechanical Engineering Department, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal b Mechanical Engineering Department, ESTG, Polytechnic Institute of Leiria, 2400-901 Leiria, Portugal Abstract Click here and insert your abstract text. The construction of hybrid parts: comprised of two different materials or obtained by two distinct technological processes is one of the main advantages of laser sintering metal. Various important aspects strongly affect the mechanical properties of sintering metal components: porosity, surface roughness, scan speed, layer thickness, and residual stresses. A major drawback is the occurrence of pores originating from initial powder contaminations, evaporation or local voids after powder-layer deposition, once these pores can act as stress concentrators leading to failure, especially under fatigue loading. The purpose of present work was to study the effect scan speed on the porosity and mechanical properties. Also the performance of two differ nt material parts was studied. The sintering las r parts were manufactured in maraging steel AISI 18Ni300, while the ubstrates of ybrid specimens were produced alternatively in two materials: the s eel for h t work tools AISI H13 and the stainless steel AISI 420. The results showed that a very high scan speed (400 or 600 mm/s) cause the appearance of high porosity perc ntages and consequent drastic reduction of tensile strength and stiffness. Tensile properties of sintered specimens and two different material parts was similar. However, the fatigue strength of two different material parts tends to decrease, for long lives, when compared with single sintered specimens. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Assessment f the fatigue life on functional hybrid laser sintering steel components J.A.M. Ferreira a, *, L.M.S. Santos a , J. da Silva a , J.M. Costa a , C. Capela a,b a CEMUC, echanical ngineering epart ent, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal b Mechanical Engineering Department, ESTG, Polytechnic Institute of Leiria, 2400-901 Leiria, Portugal Abstract Click her a d insert your ab tract text. The constructio of hybrid pa ts: comprised of two different m teri ls or ob ai ed by two distinct technological processes is o e of the main advantages of laser sint ring metal. Various important aspects tro gly affect the m chanic l properties of sintering m tal components: porosity, surface roughn ss, scan speed, lay r thickness, and residual str sses. A major drawback is the occurrence of pores originating from initial powder contaminations, evaporation or local voids aft r powder-layer d position, once these por s can act as tr ss concentrat rs le ding to f ilure, especially under fatigue loadi g. The purpose of present work was to study the effect scan spe d on the porosity and mech nica properti s. Also the performanc of two different material arts wa studied. The sintering laser par s were manufactured in maraging st el AISI 18Ni300, whil the sub trat s of hybrid specimens were produced alternatively in two aterials: the steel for hot work t ols AISI H13 and the stainl s steel AISI 420. The results showed that a very high scan speed (400 or 600 mm/s) causes the appearance of high porosity perc ntages and con equent drastic reduction of tensile strength and stiffness. Tensile properties of sintered specimens a d two different mate ial parts was simila . However, the fatigue strength of two different material parts tends to decrease, for long lives, when compared with single sintered specimens. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2015 The Authors. Published by Elsevier B.V. This is n pen access article under the CC BY-NC-ND license (http://cr ativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of PCF 2016.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Laser sintering metal, Fatigue, Functional materials, Mechanical properties; Keywords: Laser sintering metal, Fatigue, Functional materials, Mechanical properties;

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* 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 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. * Corresponding author. Tel.: +351 239790755; fax: +351 239790701. E-mail address: martins.ferreira@dem.uc.pt * Corresponding author. Tel.: +351 239790755; fax: +351 239790701. E-mail address: martins.ferreira@dem.uc.pt

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2015 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 PCF 2016. 10.1016/j.prostr.2016.02.018