PSI - Issue 10

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 1 (2018) 195–2 2 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 il l li t . i ir t. Structural Integrity Procedia 00 (2018)

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

www.elsevier.com/locate/procedia

st

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 Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Fatigue assessment of a steel frame subjected to a number of earthquake excitations N.G. Pnevmatikos a, *, G.A. Papagiannopoulos b , G. Hatzigeorgiou b a University of West Attica, School of Engineering, Department of Civil Engineering, Ag. Spyridonos Str., P.O. 12210 Egaleo-Athens,Greece b Hellenic Open University, School of Science and Technology, Parodos Aristotelous 18, GR-26335, Patras, Greece Abstract It is well known that fatigue is a reason for structural failure in steel structures. Connections in steel bridges and in steel building frames can be ruptured due to fatigue. This paper focuses on the fatigue assessment of steel frame subjected to earthquake loads. Adapting, the theory of high and low cycle fatigue, a procedure for estimating a fatigue damage limit state for earthquake design is proposed. The method can be applied for damage assessment of the existing structure to past earthquakes excitations. Results of linear and nonlinear analysis are combined with fatigue-damage design curves to predict failure or the remaining useful life after a scenario of earthquakes. A three story moment resisting steel frame is examined. The frame is solved under seismic actions with li ear and n n-linear ti e history an lysis. Fatigue method are applied o various lo d scenarios, fatigue life and damage index are estimated. © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials Keywords: Fatique; remaning life of structure; high cycle fatique; low cycle fatique; earthquake design . . , , . . , . a i rsit f st tti , l f i r , rt t f i il i ri , . ri s tr., . . l - t s, r b ll i i rsit , l f i l , r s rist t l s , - , tr s, r t t It i ll t t f ti i r f r tr t r l f il r i t l tr t r . ctions in steel bri nd i t l ildi fr r t r t f ti . i r f t f ti t f t l fr j t t rt l . ti , t t r f i l l f ti , r r f r ti ti f ti li it t t f r rt i i r . t li f r t f t i ti tr t r t t rt it ti . lt f li r li r l i r i it f ti - i r t r i t f il r r t r i i f l lif ft r ri f rt . t r t r t r i ti t l fr i i . fr i l r i i ti it li r o -li r ti i t r l i . ti t r li t ri l i ri , f ti lif i r ti t . © 2018 The Author . li l i r t . i i rti l r t - - license (http:// r ti . r /li / - - / . /). r-r i r r i ilit f t i tifi ommitt f t st I t r ti al Conferen e f the Greek Society of Experimental Mechanics of Materials Keywords: Fatique; remani lif f str t r ; i l f ti ; l l f ti ; rt e design

.

i

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

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Fatigue design is not only in theoretical level but is also imprinted to the codes, such as Eurocode, British and American standards. The last decades, a lot of research in low cycle fatigue subjected to earthquake loads has been i i t l i t ti l l l t i l i i t t t , , iti i t . l t , l t i l l ti j t t t l ti

* Corresponding author. Tel.: +30 210 70 59910 E-mail address: pnevma@teiath.gr Received: April 29, 2018; Received in revised form: July 31, 2018; Accepted: August 06, 2018 i t r. l.: - il r ss: t i t . r i : ril , ; i i r is f r : J l , ; t : st , rr s

-

t r .

li

l i r t .

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 Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/) Peer-review under responsibility of the scientific committee of the 1st International Conference of the Greek Society of Experimental Mechanics of Materials. 10.1016/j.prostr.2018.09.028 2452- 3216 © 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/3.0/). Peer-review under responsibility of the scientific committee of the 1 st International Conference of the Greek Society of Experimental Mechanics of Materials i i rti l r t - - li ( tt :// r ti . r /li / - - / . /). r-r i nder r i il t f t i tifi itt f t e 1 st I t r ti l f r f t r i t f ri t l i f t ri l * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt