PSI - Issue 1

ScienceDirect Procedia Structural Integrity 1 (2016) 026–033 Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integ ity Procedia 00 (2016) 00 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 il l li t . i i t. t t l I t it i

www.elsevier.com/locate/procedia . l i . /l t / 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. XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Mechanical behaviour of dental implants P. Bicudo a  , J.Reis b , A.M. Deus c , L. Reis a , M. F. Vaz a a IDMEC, Dep. Eng. Mec., Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b CiiEM, Instituto Superior de Ciências da Saúde Egas Moniz, Quinta da Granja, 2829-511, Almada, Portugal c CeFEMA, Dep. Eng. Mec., Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract Dental implants are in general made of titanium, since this material promotes a stable and functional connection between the bone and the surface of the implant. Efforts produced during the chewing cycles may interfere with this union, affecting the process of osseointegrati n and eventually compromising the stability of the implant. Given the difficulty in working with bone in vivo , in the present study two implant systems were inserted in polymer samples, known as Sawbones, which simulate the structure of trabecular bone. The performance of the implants was evaluated through experimental fatigue tests. The qualitative analysis of the damage in the structure of the samples was performed using scanning electron microscope images. Determination and comparison of stress fields and deformations at the Sawbone-implant interface using an analytical model of indentation and the finite element method (FEM) to model indentation and penetration were undertaken. Th experimental results showed that the performance of the Morse taper im l nt was greater than the external hexago al implant when b th were tested cyclically in samples of different d siti s. It was sho n that the diamete , length, density an type of implant-abutment interface ff cted the beh viour of the implants. The numerical results of in entation od l were ery similar to thos obtained by the analytical mod l. The results of t e FEM p etration mod l had th same tendency as the exp rimental values and the indent tion ana ysis with increa ing the de sity of the po ymer f am. It could be concluded hat, as in foams, the incre se of he bone d nsity will induce an increased stability to th implants. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. a , . . ., tit t i i , i i i , . i i , , i , t l b ii , tit t i i i i , i t j , , l , t l c , . . ., tit t i i , i i i , . i i , , i , t l t l i l t i l tit i , i t i t i l t t l ti l ti t t t t i l t. t i t i l i t it t i i , ti t i t ti t ll i i t t ilit t i l t. i t i i lt i i it i i , i t t t t i l t t i t i l l , , i i l t t t t t l . t i l t l t t i t l ti t t . lit ti l i t i t t t t l i i l t i i . t i ti i t i l ti t t i l t i t i l ti l l i t ti t i it l t t t l i t ti t ti t . i t l lt t t t t t i l t t t t t l l i l t t t t lic ll i l i t iti . t t t t i t , l t , it t i l t t t i t t t i t i l t . i l lt i t ti l i il t t t i t l ti l l. lt t t ti l t t t i t l l t i t ti i it i i t it t l . t l l t t, i , t i t it ill i i t ilit t t i l t . t . li l i . . i ilit t i ti i itt . 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. - i

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: Fatigue Test, Numerical Anal sis, Dental Implants, Osseointegration. ti t, i l ly i , t l l t , i t ti .

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

 Corresponding author. Tel.: +351 218417340; E-mail address : pedrombicudo@gmail.com, fatima.vaz@tecnico.ulisboa.pt  i t . l.: ; , ti . t i . li . t il : i il.

* 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. t . li l i . . i i ilit t i ti i itt .

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.2016.02.005