PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com cienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 5 (2017) 163–17 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2017) 000 – 000 il l li t . i i t. tr t r lI t rit r i ( )

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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. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Behavior o damaged concrete cylinders p ssively c nfined B. Moussaoui 1 , K. Ait tahar 2 , Y. Bouamra 2 1 University Mouloud Mammeri of Tizi ouzou, Laboratory LAMOMS, Algeria 2 University Akli Mohand Oulhadj of Bouira, Laboratory LM2D, Algeria This study focused on the behavior of the damaged concrete cylinders passively confined by an envelope constituted by the stack of the polymers tubes bonded by a STR resin under the axial compression load until rupture. The aim is to study the influence of the thickness of the polymer tube and the degree of damage of the concrete on the confinement rate. The compressive load was applied only on the concrete and not on the tube. Three series were considered: concrete cylinders, confined undamaged concrete cylinder and confined damaged co crete cylinder. The concrete cylinder is passively confined b 1, 2 and 3 tubes respectively. All th tubes have t e same thickness but different iameters, so that during the stacking of the tubes the clearance betwe n them is rapidly abs rbed by the resin to ensure good contact and adhesion b tween t e tubes over the all the circumference of the conc te cylinde . The ffect of the radial confinement is shown by the different stress-strain curves depicted for each series of concre e cylinder. Analysis of the results obtained from the v rious compression tests carried out on the vari us short concrete cylinders shows that the ultimate stresses at the peak nd the correspondi g eforma ions experience an improvement as function of th thickness of t polymer tube, the lateral confinement pressure does not vary linearly with the thickness of the polymer tube but above all that the confinement effect is higher for the damaged concrete cylinders Comparatively to the undamaged concrete cylinder. In conclusion, passive confinement by polymer tubes is particularly recommended for damaged concrete cylinders and columns. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. de , f B. 1 2 1 i it l i f i i , t , l i i it li l j f i , t , l i i t t i t t li i l i l tit t t t t l t i t i l i l til t . i i t t t i l t t i t l t t t t t i t t . i l li l t t t t t . i i : t li , i t li i n t li . t li i i l i y , t ti l . ll t t t t i t i t i t , t t i t t i t t t l t t i i l t i t t t i t th t t ll t i t t li . e t t i l i t i t i t t t i i t i t li . l i t lt t i t a i i t t i t t i t t li t t t lti t t t t t i d ti i i t a ti t e t i t l t , t l t l i t t li l it t t i t l t t ll t t t i t t i i t t li ti l t t t li . l i , i i t l t i ti l l t li l . t . li l i . . i ilit f t ci ti i itt . © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Confinement, concrete, polymer tube, damage, thickness, experimental; i Abstract

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

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2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017 10.1016/j.prostr.2017.07.089 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216© 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. - t r . li l i r . . i i ilit t i ti i itt .