PSI - Issue 5

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 5 (2017) 912–919 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 Imp ov ment of the fatig crack growth resistance in long term operated steel strengthened with CFRP patches G. Lesiuk a *, M. Katkowski a , M. Duda a , A. Królicka a , J.A.F.O. Correia b , A.M.P. De Jesus b , J. Rabiega c a Faculty of Mechanical Engineering, Department of Mechanics, Materials Science and Engineering, Wrocław University of Science and Technology, Smoluchowskiego 25, 50- 370 Wrocław, Poland b INEGI/Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal c Faculty of Civil Engi eering, Faculty of Bridges and Ra lways, Wrocł w University of Science and Technology, Wybrzeże Wyspiańskiego 27 , 50- 370 Wrocław, Poland The maintenance of the old steel structures is one of the main challenges in engineering practice – mainly due to the lack of the experimental data performed for existing old steel structures erected at the turn of the 19 th and 20 th centuries. In this paper the fatigue crack growth behavior in structural components from the old 19 th (and early 20 th ) centuries structures (e.g. bridges) has been investigated. The delivered material for investigation was extracted from a beam made from puddled iron and mild rimmed steel, commonly used 100 years ago. It has been confirmed in author’s experimental works, that the fatigue crack growth rate in this ancient type of steel is higher than in its modern equivalent. One f the fundamental engineering task is the problem of the extension of the pre-critical f tigue crack growth in such a type of st el. On of the promising approach is hybrid approach (exp rimental-numerical) b sed on the additional energy dissipation mechanisms in fatigue crack growth process. One of th successful strengthening method is the CFRP (Composite Fiber Reinforce Polymer) patching along the fatigue crack paths. The presented approa h has b e stu ied and discussed in t is pap r o the background of the numerical a d experim nt l data. As it was xpected, th proposed strengthening method is efficient and promising in case of the “immediat ” repairs of critical members with cracks © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. r u G. b a lt f i l i i , t t f i , t i l i i i , ł i it f i l , S l i , - ł , l b I I/ lt f i i , i it f t , . t i , - t , t l c lt f i il i i , lt f i il , ł i it f i l , i i , - ł , l i t t l t l t t i t i ll i i i ti i l t the lack of the experime t l t i ti l t l t t t t t t t th th t i . t i t ti t i i t t l t t ol th l th t i t t . . i been investigated. li t i l i ti ti t t l i il i t l, l . t i i t i t l , t t t ti t t i t i i t t t l i i t i it i l t. t t l i i t i t l t t i t iti l ti t i t t l. t i i i i i t l i l a t iti l i i ti i i ti t . t l t t i t i t it i i l t i l t ti t . t t i i i t i t t i l i t l t . it t , t t t i t i i i t i i i t i i t i iti l it t . Published by Elsevier B.V. Peer-review unde i ilit t i 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. Abstract

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: fatigue crack; CFRP; old mild steel; fatiguelifetime improvement ; l il t l; f ti lif ti i r t : f ti r ;

* Corresponding author. Tel.: +48 713203919; fax: +48 713211235. E-mail address: Grzegorz.Lesiuk@pwr.edu.pl i t r. l.: ; f : . - il : r r . i r. . l 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.2017.07.109 * 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