PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com Sci nceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 584–589 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. ECF22 - Loading and Environmental effects on Structural Integrity Effect of transversal loading on the fatigue life of cold-drawn duplex stainless steel Mihaela Iordachescu a *, Maricely de Abreu a , Andrés Valiente a a Materials Science Dpt., E.T.S.I. Caminos, Universidad Politécnica de Madrid, Prof. Aranguren St., 28040, Madrid, España The paper gives new insights on failure behavior of high-strength, heavily cold-drawn duplex stainless steel wires when simultaneously subjected to static transverse and longitudinal loadings, with the latter ones being of a fully tensile or cyclic nature. The wires might experience such combined actions when incorporated into strands of pre or post-tensioned cable systems, today used in a wide spectrum of construction applications. The transversal loads are due to the contact forces between the wires, and mainly occur by longitudinal tensioning of strands. In order to reproduce them, the experiments were made with a specially designed device assuring the control of the locally applied transversal compression during the wire loading in simple or cyclic tension. The results concerning the static bi-axial loading did not show significant differences concerning th failure load f duplex stainless steel wires when compared with that of currently used prestressing eutectoid wires: on this basis, an empirical fractu e cr terion predicting the critical loa combinations was formulat d. The simultaneous action of t ansverse compressive loading and fatigue tensile loading of 200 MPa stress range produces nominally nfinite lifet me of lean dupl x wires for combin tions of the compressive and ximu tensile loa s experimentally determ ned. These combinati ns could b roughly describ as those given by compressive loads or m ximum tensil fatigue loads higher than 50% of the tensile bearing capacity of lean duplex wire. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Effect of transversal loading on the fatigue life of cold-d wn duplex stainless steel Mihaela Iordachescu a *, Maricely de Abreu a , Andrés Valiente a a Materials Science Dpt., E.T.S.I. Caminos, Universidad Politécnica de Madrid, Prof. Aranguren St., 28040, Madrid, España Abstract The paper gives new insights on failure behavior of high-strength, heavily cold-drawn duplex stainless steel wires when simult n ously subjected to static tr nsverse and longitudinal loadings, with the latter ones being of a fully tensile or cyclic nature. The wires might experience such combined actions when incorporated into strands of pre or post-tensioned cable systems, today used in a wide spectrum of constru tion applicati s. The transvers l loads are due t the c ntact forces b tween the wires, an mainly occur by longit dinal te ioning of strands. In ord r to reproduce them, the experime ts were made ith a specially designed device assuring the control of the l cally applied transversal compression during the wire loading in simple or cyclic tension. The results concerning the static bi-axial loading did not show significa t differences concerni the failure load of duplex stainless st el wires when compared with that of currently used prestressing eutectoid wir s: on this basis, an mpirical fracture criterion predicting the critical load combinations was f rmulat d. Th simultaneous action of ransverse compressiv loading and fatigue tensile loading of 200 MPa stress ra g pr duces a nominally infinite lifetime of lean duplex wir s for c mbinations of the compressive an maximum tensil loads experiment lly determined. These co binations could be roughly described as those given by compressive loads or maximum tensil fatigue loa s higher than 50% f the tensile bearing capacit of lean duplex wire. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: cold-drawn duplex stainless steel wires; tensile-compression static loading; static compression-tensile fatigue; fatigue life; failure micro and macro-mechanisms; © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: cold-drawn duplex stainless steel wires; tensile-compression static loading; static compression-tensile fatigue; fatigue life; failure micro and macro-mechanisms; Abstract

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

* Corresponding author: orcid.org/000-0003-0545-4581; Tel.: +34 910-673-309; E-mail address: mihaela.iordachescu@upm.es * Corresponding author: orcid.org/000-0003-0545-4581; Tel.: +34 910-673-309; E-mail ad ress: mihaela.iordachescu@upm.es

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 organizers.

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. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.096