PSI - Issue 5

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 5 (2017) 683–688 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2017) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity 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 Detection of back-surface crack based on temperature gap measurement Yui Izumi a, *, Koki Uenishi a , Yoshiaki Mizokami b Akira Moriyama b , Takahide Sakagami c a Department of Mechanical Systems Enginee ing, University of Shig Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan b Honshu-Shikoku Bridge Expressway Co., Ltd., 4-1-22 Onoe-dori, Chuo-ku, Kobe 651-0088, Japan c Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan Abstract For large-scale steel structures such as orthotropic steel decks in highway bridges, nondestructive inspection of deteriorations and fatigue damages are indispensable for securing their safety and for estimating their remaining strength. As conventional NDT techniques for steel bridges, visual testing, magnetic-particle testing and ultrasonic testing have been commonly employed. However, these techniques are time- and labor- consuming inspections, because special equipment is required for inspection, such as scaffolding or a truck mount aerial work platform. The present authors developed a new thermography NDT technique for crack detection, which is based on temperature gap appeared on the surface of structural members due to thermal insulation effect of the crack. The practicability of the developed technique to through crack was demonstrated by the field experiments for highway steel bridges in service. In this paper, the applicability of the inspection technique based on temperature gap measurement to back surface crack detection is investigated by the laboratory testing. The testing was conducted for several specimens. A fatigue crack was introduced in a back surface of each specimen by 4 point bending fatigue test. This investigation has revealed that back surface fatigue crack can be detected by the proposed technique. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2nd International Conference on Structural Integrity, ICSI 2017, 4-7 September 2017, Funchal, Madeira, Portugal Detection of back-surface crack based on temperature gap measurement Yui Izumi a, *, Koki Uenishi a , Yoshiaki Mizokami b Akira Moriyama b , Takahide Sakagami c a Department of Mechanical Systems En ineering, University of Shiga Prefecture, 2500 Hassaka-cho, Hikone Shiga 522-8533, Japan b Honshu-Shikoku Br dge Expr ssway C ., Ltd., 4-1-22 Onoe-dori, Chuo-ku, Kobe 651-008 , Japan c Department of Mechanical Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe 657-8501, Japan Abstract For large-sc le teel structure such as orthotropic steel d cks i highway bridges, nondestructive inspection of deteriorations and fatigue damage are indispensable for ecuring their safety and for estimating their rema ing str ngth. As conventional NDT techniques for steel bridges, v sual testing, mag etic-particle testi g and ultrasonic testing have been commonly employed. However, these techniques are time- and labor- consuming inspections, because special equipment is required for i spection, su h as scaffolding or a truck mount aerial work l tform. The present auth rs developed a new thermography NDT technique for crack detection, whi h is based on t mperatur gap appeared on the su face of tructural members due to thermal insulation effect of the c ack. The practicabili y of the developed technique to through rack was demonstrated by the field experiment for highway steel bridges in servic . In this paper, the applicability of the inspection tech ique base on temperature gap measurement to back surface crack etection is investigat d by the laboratory testing. The tes ng wa conducted for several pecim ns. A fatigue cr k was introduced in a back surface of each specimen by 4 point bending fatigue test. This investigation has revealed that back surface fatigue crack can be detected by the proposed technique. © 2017 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. © 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: Infrared thermography, remote nondestructive testing, back surface crack, steel structure ; Keywords: Infrared thermography, remote nondestructive testing, back surface crack, steel structure ;

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. E-mail address: izumi.yu@mech.usp.ac.jp * Correspon ing author. E-mail address: izumi.yu@mech.usp.ac.jp

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.2017.07.041 * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 2017 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017. 2452-3216 © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ICSI 2017.