PSI - Issue 5

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com Sci ceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Struc ural Integrity 5 (2017) 1184–1191 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 il l li t . i ir t. 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 Signal processing methods to improve the Signal-to-noise ratio (SNR) in ultrasonic non-destructive testing of wind turbine blade Kumar Anubhav Tiwari a, *, Renaldas Raisutis a ,Vykintas Samaitis a Ultrasound Research Institute, Kaunas University of Technology, K. Barsausko st. 59 - A426, Kaunas LT-51423, Lithuania Abstract Ultrasonic non-destructive testing (NDT) methods are being used quite effectively nowadays, but the multilayered structure of composite materials results in the serious problem in the detection of defects/flaws. The resulting ultrasonic signal is often noisy and denoising of this signal is necessary in order to extract useful information so that faults can be detected, located and sized. Currently, there is a high demand for automatic ultrasonic signal processing techniques to not only remove the need for manual flaw detection and assessment, but also increase the a curacy, reliability and repeatability of the non-destructive evaluation. There are various signal processing techn ques which can be sed in ultrasonic m asurement and selection of appro riate metho is one of the major key factors in t e field of ultrasonic testing o composite materials. In the presented work, the sample of wind turbine blad (WTB) manufactured using glass fiber reinforced plastic GF P) was investigated using ultrasonic NDT in order to estimate the artificially made disbond type d fects of 15 mm and 25 mm diam ter on the trailing edge. The transmitting and receiving tra sducers were fixed on movable panel at distance of 50 mm and guide waves (GW) were rece ved at each one millimeter step al ng the scanning distance of 500 mm. The measurement is performed using low-frequency (LF) ultrasonic system which was dev loped by Ultrasound I stitut of Kaunas University of Tech ology. Various signal processing techniques were applied to overcome the structural noise and/or extract the i formation about the defects. The three most promising signal processing techniques: cross-correlation meth ds, wavelet transform (WT) and Hilbert-Huang (HHT) transform were discussed and compared in the process of defects estimation. © 2017 The Authors. Published by Elsevier B.V Peer-review under responsibility of the Scientific Com ittee of ICSI 2017. tr t r l I t rit , I I , - t r , l, ir , rt l (SNR) in ultrasonic non-d d i i a, , l i ti a , i t iti a ltrasound esearch Institute, aunas niversity of echnology, K. Barsausko st. 59 - 426, Kaunas LT-51423, Lithuania str ct ltras ic - estr cti e testi ( ) et s are ei se ite effecti el a a s, t t e ltila ere str ct re f c site aterials res lts i t e seri s r le i t e etecti f efects/fla s. e res lti ltras ic si al is fte is a e isi f t is si al is ecessar i r er t e tract sef l i f r ati s t at fa lts ca e etecte , l cate a size . rre tl , t ere is a i e a f r a t atic ltras ic si al r cessi tec i es t t l re e t e ee f r a al fla etecti a assess e t, t als i crease t a c rac , relia ilit a r eata ilit f t e - estr cti e e l ati . ere ar ari s si al r ces i tec i es ic ca e se i ltras ic as r e ts a selecti f a r riate et is f t e aj r e fact rs i t e fiel f ltras ic testi c sit at rials. I t e rese te r , t e sa le f i t r i e la ( ) a fact re si lass fi er rei f rce lastic ) as i sti ate si ltras ic i r er t esti te t e artificiall a e is t e fects f a ia ter t e traili e e. e tra s itti a recei i tra s cers ere fi e a le a el at ista e f a i e a es ( ) ere recei e at eac e illi eter ste al t sca i ist ce f . e eas re e t is erf r e si l -fre e c ( ) ltras ic s ste ic as e el e ltras I stit te f a as i ersit f ec l . ari s si al r cessi t c i es ere a lie t erc e t e str ct r l ise a / r e tract t e i f r ati a t t e efects. e t ree st r isi si al r c s i techniques: cross-correlation methods, wavelet tra sf r ( ) a il ert- a ( ) tra sf r ere isc sse a c are i t e r cess f efects esti ati . e t rs. lis e b lse ier . . eer-review under responsibility of the Scie tific ittee f I I . © 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. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Keywords: Signal proce sing, wind turbin blad ; ultrasonic NDT; comp site; cross-correlation, wavelet transform; Hilbert-Huang transform ey ords: ignal proce sing, ind turbin blad ; ultrasonic ; co posite; cross-correlation, avelet transfor ; ilbert- uang transfor I t r ti l f r

* Corresponding author. Tel.: +370-64694913; fax: +370-37451489. E-mail address: k.tiwari@ktu.lt * orresponding author. el.: 370-64694913; fax: 370-37451489. - ail address: k.ti ari ktu.lt

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.2017.07.036 * 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 The Authors. ublished by lsevier . . eer-re ie er res si ilit f t e cie tific ittee f I I .