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 Struc ural Integrity 5 (2017) 1192–1197 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i ir t. i i tructural Integrity rocedia 00 (2017) 000 – 000

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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 Structural damage detection of a cantilever beam under varying temperature using a collection of time series Andreas Kyprianou*, Andreas Tjirkallis University of Cyprus, Departtment of Mechanical and Manufacturing Engineering, Nicosia 1678, Cyprus Condition monitoring of structures in service assesses the risk f damage development. Its essential constituent is the damage detection methodology. In th co text of condition monitoring f in service structures a damage detection methodology analy es data obtained from the structure while it is in operation. Usually, this means that the data could be affected by operational and environmental conditions in a way that could mask the effects of damage on the data. This, depending on the damage detection methodology, could lead to either false alarms or failure to detect existing damages. In this article a damage detection methodology that is based on the Spatio-Temporal Continuous Wavelet Transform (SPT-CWT) analysis of a sequence of experimental time responses of a cantilever beam is proposed. The cantilever is subjected to pink noise and it is manually heated by a heat gun in order to impart varying temperature conditions. The response of the cantilever beam is measured by a high speed camera. Edges are extracted from the series of images of the beam response captured by the camera. Subsequent processing of the edges gives a series of time responses on 439 points on the beam. This sequence is then analyzed using the SPT-CWT to identify damage. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: damage detection, spatiotemporal wavelet transform, varying operating conditions tr t r l I t rit , I I , - t r , l, ir , rt l temperature using a collection of time series i , ji lli niversity of yprus, epartt ent of echanical and anufacturing ngineering, icosia 1678, yprus str ct iti it ri f str ct res i ser ice assesses t e ris of a a e e el e t. Its esse tial c stit e t is t e a a e etecti et l . I t e c te t f c iti it ri f i ser ice str ct res a a a e etecti et l a al ses data obtained from the structure while it is in operation. Usually, this means that the data could be affected by operational and e ir e tal c iti s i a a t at c l as t e effects f a a e t e ata. is, e e i t e a a e etecti et l , c l lea t eit er false alar s r fail re t etect e isti a a es. I t is article a a a e etecti et l t at is ase t e ati - e ral ti s a elet ra sf r ( - ) a al sis f a se e ce f e eri e tal ti e res ses f a ca tile er ea is r se . e ca tile er is s jecte t i ise a it is a all eate a eat i r er t i art ar i g temperature conditions. The response of the cantilever beam is measured by a high speed camera. Edges are e tracte fr t e series of images of t e ea res se ca t re t e ca era. se e t r cessi f t e e es i es a series f ti e res ses i ts the beam. This sequence is then analyzed using the SPT-CWT to identify damage. © 2017 The thors. Published by Elsevier . . Peer-review under responsibility f t e cie tific ittee f I I . Keywords: da age detection, spatiote poral avelet transfor , varying operating conditions © 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. Vibrating structures in operation are continuously under risk of developing cracks and other damages. The existence of such cracks and damages cause changes to their dynamic behavior which in turn deteriorate their performance that in many times lead to structural failure. For structures under monitoring these changes of dynamic i ti str t r s i r ti r ti sl r ris f l i r s t r s. ist f s r s s s s t t ir i i r i i t r t ri r t t ir rf r that in many tim s l t str t r l f il r . r str ctures und r it ri t s s f i Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction . I t ti I t r ti l f r

* Corresponding author. Tel.: +357-22892294 E-mail address: akyp@ucy.ac.cy * orresponding author. el.: 357-22892294 - ail address: akyp ucy.ac.cy

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.2017.07.038 * 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. 2452-3216 2017 he uthors. ublished by lsevier . . eer-re ie er res si ilit f t e cie tific ittee f I I .