PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 6 1–6 6 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 rganizers. ECF22 - Loading and Environmental effects on Structural Integrity Influence of rebar design on mechanical behaviour of Tempcore steel Hortigón B. a *, Ancio F. a , Nieto-García E.J. a , Herrera M.A. a , Gallardo J.M. b a Escuela Politécnica Superior (Universidad de Sevilla), C/ Virgen de Africa,7,41011 Sevilla, España b Escuela Técnica Superior de Ingeniería (Universidad de Sevilla), C/ Camino de los Descubrimientos s/n,41092 Sevilla, España Abstract Tensile behaviour of metals beyond the ultimate tensile strength (UTS) must be considered to calculate toughness or absorbed energy till fracture. Structural steels, designed to withstand earthquakes, are the typical material where post necking behaviour can be of paramount importance. This paper deals with the tensile stress-strain behaviour of Tempcore Rebar, a specifically shaped structural steel. Helical, short ribs, formed by olling, protrude fr m the cylindrical b sic shape of the ebar. This help in increasing concrete/steel adherence in reinforced structures. On the other hand, those ribs make it difficult to assess strain distribution in the necking area, according to well-known theories describing neck profile. New or modified experimental methods, along with new theoretical approaches must be developed to help in studying neck profile evolution and corresponding stresses in rebars. Advances in such methods and theories are presented in this paper along with comparison with Tempcore cylindrical bars necking behaviour. The effect of ribs is clearly identified. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Tempcore, rebar, mechanical behaviour, necking, fracture. ECF22 - Loading and Environmental effects on Structural Integrity Influence of rebar design on mechanical behaviour of Tempcore steel Hortigón B. a *, Ancio F. a , Nieto-García E.J. a , Herrera M.A. a , Gallardo J.M. b a Escuela Politécnica Superior (Universidad de Sevilla), C/ Virgen de Africa,7,41011 Sevilla, España b Escuela Técnica Superior de Ingeniería (Universidad de S villa), C/ am no de los Descubrimientos s/n,41092 Sevilla, España Abstract Tensile behaviour of metals beyond the ultimate tensile strength (UTS) must be considered to calculate toughness or absorbed energy till fracture. Structural steels, designed to withstand earthquakes, are the typical material where post necking behaviour can be of paramount importance. This paper deals with the tensile stress-strain b haviour of Tempcore Rebar, a specifically shaped structural steel. Helical, short ribs, form d by rolling, protrude from the cyli drical basic shape of the Rebar. This help in increasing con r te/ste l adherence in r infor ed structures. On the oth r hand, those ribs make it difficult to ass ss strain distribution in the necking ar a, ccordi g to well-known theories describing neck profile. New or modified experimental methods, along with new theoretic l approaches must be developed t h lp in studying neck profile evolution and corres onding stresses in rebars. Adva ces in such methods nd theories are presented in this paper along with c mparison with Tempcore cylindrical bars ecking behaviour. The effect of ribs is clearly identifi d. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: Tempcore, rebar, mechanical behaviour, necking, fracture. Nomenclature* E Young’s modulus (modulus of elasticity in tension)

Nomenclature* E

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Young’s modulus (modulus of elasticity in tension) Axial force (load) Initial cross-sectional area Axial force (load) Initial cross-sectional area Instantaneous cross-sectional area Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Instantaneous cross-sectional area Outer diameter (determinated by longitudinal ribs) d out Outer diameter (determinated by longitudi al ribs) F F S o S o S S d out

* Hortigón B. Tel.: +34-954-552-828; fax: +34-954-552-828. E-mail address: bhortigon@us.es * Hortigón B. Tel.: +34-954-552-828; fax: +34-954-552-828. E-mail address: bhortigon@us.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 responsibility 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.2018.12.099