PSI - Issue 13

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 13 (2018) 267–272 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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 organizers. ECF22 - Loading and Environmental effects on Structural Integrity Application of the equivalent material concept to fracture of U notched solids under small scale yielding F.J. Gómez a *, A.R. Torabi b a Advanced Material Simulation, S.L., c/Asturias 3. Bilbao E-48015. Spain b Fracture Research Laboratory, Faculty of New Sciences and Technologies, University of Tehran, P.O. Box 14395-1561, Tehran, Iran Abstract This paper studies the applicability of the equivalent material concept developed by the author to the fracture of elastoplastic material due to the presence of U-notches. The approach of equivalent material concept consists of simplifying the study of an elastoplastic material reducing it to the linear elastic case with a maximum stress such as in a tensile test the deformation energy is equal to the real material. This idea combined with the cohesive zone model allows to establish a procedure to predict the failure of U-notched elements. The methodology has been successfully applied to five elastoplastic materials, and in all of them, the level of plasticity regarding the load of plastic collapse has been determined. This analysis verifies the proposed methodology and e tablish some application limits when the failure occurs within small scale yielding © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: U-notches; failure criteria; cohesive zone model; Equivalent Material Concept. 1. Introduction Str ss concentrators in structu al elements such as U-shaped notches are weak points with high risk of brittle failure and an integrity assessment methodology is needed to evaluate the maximum load that resist. ECF22 - Loading and Environmental effects on Structural Integrity Application of the equivalent material concept to fracture of U notched solids under small scale yielding F.J. Gómez a *, A.R. Torabi b a Advanced Mat rial Simulation, S.L., c/Asturias 3. Bilbao E-48015. Spain b Fracture Research Laboratory, Faculty of New Sciences and Technologies, University of Tehran, P.O. Box 14395-1561, Tehran, Iran Abstract This p per studies the applicability of the equivalent material conc pt developed by the author t the fracture of elastoplastic m terial due to the presence of U-notches. The appro ch of equiv lent mate ial concept consists of simplifying the study of an elastoplastic mat rial reducing it to the linear elastic case with a maximum stress such a in a tensile test the eformation energy is equal to the real material. This idea combined with the cohesive zone model allows to establish procedure to predict the failure of U-notched elements. T methodology has been successfully appli to five elastoplastic materials, and in all f them, the l vel of plasticity regarding the load of plastic collapse has bee determined. This analysis verifies the proposed methodology and establish some application limits when the failure occurs within small scale yielding © 2018 The Autho s. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. Keywords: U-notches; failure criteria; cohesive zone odel; Equivalent Material Concept. 1. Introduction Stress concentrators in structural elements such as U-shaped notc es are weak points with high risk of brittle failure and an in eg ity assessment m thodology is needed to evaluate the maximum load that resist. © 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.

* Corresponding author. Tel.: +34 629269931. E-mail address: Javier.gomez@amsimulation.com * Correspon ing author. Tel.: +34 629269931. E-mail address: Javier.gomez@amsimulation.com

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2018 Th Authors. Published by Elsevie 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.2018.12.045