PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Available o line at www.sciencedire t.com ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 7 5–7 9 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralI tegrity Procedia 00 (2018) 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. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity The water-saturation effect for concretes and rocks subjected to high strain rates N.S. Selyutina a,b, *, Yu.V. Petrov a,b a Saint Petersburg State University, 7/9, Universitetskaya nab., St. Petersburg, 199034, Russia b IPME RAS, Extreme States Dynamics Department, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia Abstract The behavior of dynamic strength of concrete and rocks (granite, tuff) is analyzed using structural-temporal approach. An influence of a saturation ratio on characteristic strength parameters of investigated materials is considered. The dynamic tensile strength and the compressive strength of saturated and unsaturated rocks under quasi-static and dynamic loading are compared. An increase of dynamic strength measured in terms of the incubation time parameter with the growth of the saturation ratio is studied and explained. © 2018 The Authors. Published by Elsevier B.V. Peer- eview under respo sibility of the ECF22 organizers. Keywords: ultimate stress; in ubation time; saturation ratio 1. Introduction Structure transformations as reinforcement (Hao and Hao (2013); Kruszka et al. (2015)), saturation ratio (Huang et al. (2010); Zhou and Ding (2014)), water-cem nt ratio (Rossi et al. (1994); Yan and Lin (2006)) have influence on material strength properties. Also, the behavior of the ultimate stress of rocks and concrete under static and dynamic loading depends on pulse amplitude and pulse duration (Petrov et al. (2010); Smirnov and Petrov (2018)). One of difficultly of computational fracture mechanics takes place research of influence of structure transformations not only in the range of static loading but high-rate loadings (Ogata et al. (2004); Schuler et al. (2006); Zhou et al. (2016)). Some experiments (Zhou and Hao (2008); Alam et al. (2015); Mishra et al. (2018)) showed that the same ECF22 - Loading and Environmental effects on Structural Integrity The water-saturation effect for concretes and rocks subjected to high strain rates N.S. Selyutina a,b, *, Yu.V. Petrov a,b a Saint Petersburg State University, 7/9, Universitetskaya nab., St. Petersburg, 199034, Russia b IPME RAS, Ext eme Sta es Dy amics Department, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia Abstract The behavior of dynamic strength of concrete and rocks (granite, tuff) is analyzed using structural-temporal approach. An influence of a saturation ratio on characteristic strength parameters of investigated materials i considered. The dynamic tensile strength and the compressive strength of saturated and unsaturat d rocks under quasi-static and dynamic loading are compared. An incre se of dynamic trength measured in terms of the incubation time pa ameter with the growth of the saturation ratio is studied and explai ed. © 2018 The Authors. Published by Elsevier B.V. Peer-review under esponsibility of the ECF22 organizers. Keywords: ultimate stress; incubation time; saturation ratio 1. Introduction Struct re transformations as reinforc ment (Hao an H o (2013); Kruszka et al. (2015)), saturation ratio (Huang et al. (2010); Zhou and Di g (2014)), water-cement ratio (R ss et l. (1994); Yan and Lin (2006)) have influence on material strength properties. Also, the behavior of the ultimate stress of rocks and concrete under static a d dynamic loading depends on ulse amplitude and pulse duration (Petrov et al. (2010); Smirnov and Petrov (2018)). One of difficultly of computational fracture mechanics takes place research of influence of structure transformations n t only in the range of static loading but high-rate loadings (Ogata et al. (2004); Schuler et al. (2006); Zhou et al. (2016)). Some experiments (Zhou and Hao (2008); Alam et al. (2015); Mishra et al. (2018)) showed that the same © 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.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216© 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216© 2018 The Authors. Published by Elsevier B.V. Peer review under responsibility of the ECF22 organizers. * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: nina.selutina@gmail.com * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail ad ress: nina.selutina@gmail.com

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 B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.117