PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 P o edi Structural Integr ty 5 (2017) 27–33 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i i t. tr t r l I t rit r i ( )

www.elsevier.com/locate/procedia . l i r. /l t / r i

www.elsevier.com/locate/procedia

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 Currently used systems of dental posts for endodontic treatment Joana Machado a, *, P ulo A meida b , Sampaio Fernandes b , Arcelina Marqu s c , Mário Vaz d a INEGI - Institute of Science and Innovation in Mechanical and Industrial Engineering, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal b FMDUP - Faculty of Dental Medicine of the University of Porto, Rua Dr. Manuel Pereira da Silva, s/n, 4200-393 Porto, Portugal c ISEP - Polytechnic of Porto, School of Engineering, Rua Dr. António Bernardino de Almeida, 431, 4249-015 Porto, Portugal d FEUP - Faculty of Engineering of the University of Porto, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal Abstract An advanced stage of a tooth decay promotes an extremely damaged tooth that needs endodontic treatment to be restored. When satisfactory coronal tooth structure remains, an artificial crown can be placed without a post. On the other hand, the treatment of seriously damaged teeth often require an endodontic post. The main reason for using post is to enable rebuilding of the tooth structure prior to crown restoration. Dentists believe that endodontic posts provide a stable and solid restoration of the tooth, as well as providing strengthening of the tooth root, which constitutes the solid basis for a dental crown restoration. However, some authors reported that the strength of the tooth is directly related to the remaining dentin, and because of that, an endodontic treatment can present a higher risk of biomechanical failure. A number of different materials have been used for the manufacturing of dental posts. The fundamental posts requirements include high tensile strength, high fatigue resistance to occlusal and shear loading and a good distribution of the forces affecting the tooth root. The purpose of this article is to review the current literature and identify the various characteristics of a dental post, as well as some principles on the endodontic treatment for tooth decay. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: Dental post, endodontic treatment, post design, post material, mechanical tests; Joana Machad , a l a I I - I tit t f i I ti i i l I t i l i i , . t i , , - t , t l b - lt f t l i i f t i it f t , . l i il , / , - t , t l c I - l t i f t , l f i i , . t i i l i , , - t , t l d - lt f i i f t i it f t , . t i , , - t , t l Abstract t t t t t l t t t t ti t t t t t . ti t l t t t t i , ti i i l l it t t. t t , t t t t i l t t t i ti t. i i t i t l il i t t t t t i t t ti . ti t li t t ti t i t l li t ti t t t , ll i i t t i t t t t, i tit t t li i t l t ti . , t t t t t t t t t t i i tl l t t t i i ti , t t, ti t t t t i i i i l il . i t t i l t t i t l t . t l t i t i l i t il t t , i ti i t t l l l i i t i ti t ting the tooth root. The purpose of this article is to review the current literature and identify t i t i ti t l t, ll i i l t ti t t t t t ecay. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of IC . : t l t, ti tr t t, t i , t t ri l, i l t t ; © 2017 The Authors. Published by Elsevi r B.V. Peer-review under responsibility f the Scientific Comm ttee of ICSI 2017

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 1. Introductio . i n

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Most of teeth failures are due to tooth decay, also known as dental caries. Dental caries are characterized by the appearance of cavities, which are caused by bacteria or acids that are present in human mouth. These cavities begins t t t il t t t , l t l i . t l i t i t iti , i t i i t t t i t . iti i

* Corresponding author. Tel.: +351 225082151 ; fax: +351 229537352. E-mail address: jcmachado@inegi.up.pt i t r. l.: ; f : . - il : j i i. . t rr

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.2017.07.056 * 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. l i r . . i i ilit t i ti i itt . - t r . li