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) 1168–1175 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2017) 000 – 000 il l li t . i ir t. i i StructuralIntegrity Procedia 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 Fatigue crack monitoring using plastic optical fibre sensor Do g Yang a , Jinqi Wang a , Dan Li a , K.S.C. Kuang b * a School of Civil Engineering, Hefei University of Techonlogy, 230009 Hefei, China b Department of Civil and Environmental Engineering, National University of Singapore, 117576 Singapore, Singapore Optical fibre sensors have shown their excellent potential for structural monitoring in a variety of engineering structures. This paper discussed the feasibility f real-time mo itoring of fa gue crack using an extr nsic plastic optic l fibre sens r. This intensity-based plastic optical fibre (POF) sensor was fabricated by connecting two cleaved optical fibres into a capillary tube and inserting some in-filling into the tube to improve the sensitivity of the sensor. The aim of this sensor is to detect crack initiation and subsequently monitor the propagation of crack under fatigue load, relying only on the plastic fibre sensor signal and a simple signal processing method. Performance of the fabricated POF sensor was evaluated by comparing with another technique, namely, acoustic emission (AE) method. The results show remarkable resemblance in terms of crack initiation and propagation identification exhibited by both of the sensors, highlighting the potential of the proposed method for crack initiation detection and subsequent monitoring of crack propagation. The simplicity of the technique renders it an attractive structure health monitoring tool for fatigue crack monitoring. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. Keywords: sensors; plastic optical fibre; intensity loss; structural health monitoring; RMS envelope; fatigue crack l f rence on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, ir , rt l ng Yang a , Jinqi Wang a , Dan Li a , K.S.C. Kuang b * a School of ivil ngineering, efei niversity of Techonlogy, 230009 Hefei, China b epart ent of Civil and Environ ental ngineering, ational niversity of Singapore, 117576 Singapore, Singapore str ct tical fi re se s rs a e s t eir e celle t te tial f r str ct ral it ri i a ariet f e i eeri str ct res. is a er disc sse t e feasi ilit f real-ti e nit ri f fati e crac si a e tri sic lastic tic l fi re se sor. is i te sit - ase lastic tical fi re ( ) se s r as fa ricate c ecti t clea e tical fi res i t a ca illar t e a i serti s e i -filli i t t e t e t i r e t e se siti it f t e se s r. e ai f t is se s r is t etect crac i itiati a s se e tl it r t e r a ati f crac er fati e l a , rel i l t e lastic fi re se s r si al a a si le si al r cessi et . erf r a ce f t e fa ricate se s r as e al ate c ari it a t er tec i e, a el , ac stic e issi ( ) et . e res lts s re ar a le rese la ce i ter s f crac i itiati a r a ati i e tificati e i ite t f t e se s rs, i li ti t e te tial of t e r se et f r crac i itiati etection and subsequent it ri f crac r a ati . e si licit f t e tec i e re ers it a attracti e str ct re ealt it ri t l f r fati e crack monitoring. e Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee f I I . Keywords: sensors; plastic optical fibre; intensity loss; structural health onitoring; envelope; fatigue crack © 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. Many different structure health monitoring approaches, relying on the analysis of different physical phenomena and experimental measurements, have been introduced and reported in the literature (Doebling et al., 1996, Doebling iff r t str t r lt it ri r s, r l i t l sis f iff r t si l ri t l s r ts, i tr r rt i t lit r t r ( li t l., , li Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation. Abstract 1. Introduction . I t ti I t r ti

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.2017.07.029 * 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 . * Corresponding author. Tel.: +86-18673191152; fax: +86-055162901432. E-mail address: yangdong@hfut.edu.cn * orresponding author. el.: 86-18673191152; fax: 86-055162901432. E-mail address: yangdong@hfut.edu.cn