PSI - Issue 2_B

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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. 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy The dynamic str ngth of concrete and macroscopic temporal parameter characterized in fracture process N. Selyutina a , Y. 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 The structural-temporal approach based on the notion of incubation time is used for interpretation of strength behaviour of concrete in the fracture process. Temporal dependences of concrete under influence of steel spiral fiber, water, a scale level of fracture are evaluated by the incubation time criterion. Effect of more significant increase of strength in dynamic condition than static a growth percentage of fiber is explained by behaviour of the incubation time related with presence of defect in specimen. Numerical simulation of dynamic strength with different percentage of spiral fibers is given. Both size effect and scale effect for concrete samples subjected to impact loading are considered. Statistical nature of a size effect contrasts to a scale effect that is related to the definition of a spatio-temporal representative v lume determining the fracture event on the given scale level. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: fracture stress; strain rate; fiber; fracture scale level 1. Introduction The strength characteristics of conc ete under dynamic loading are widely applied in fracture mechanics, construction and civil e g neering fi lds. Nowadays, an actual problem is a reinforcing by the discrete addition of fibers with different geometry, percentage of fibers and material (Hao and Hao (2013), Kruszka et al. (2015)). The rupture stress in comparison with a volume ratio of fiber gives a good result in increment of the strength properties. However, some experiments (Song and Hwang (2004), Yet et al. (2012), Kruszka et al. (2015)) show a decrease of 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy The dynamic strength of concrete and macroscopic temporal parameter characterized in fracture process N. Selyutina a , Y. Petrov a,b, * a Saint Petersburg State University, 7/9, Universitetskaya nab., St. Petersburg, 199034, Russia b IPME RAS, Extreme States Dy amics Department, V.O., Bolshoj pr., 61, St. Petersburg, 199178, Russia Abstract The structural-temporal approach based on the notion of incubation time is used for interpretation of strength behaviour of concrete in the fractu e process. Temporal dep ndences concre e under infl ence f ste l spir l fiber, water, a scale level fracture are evalu ted by the incubation time criterion. Effe t of more significant increase of trength in dynamic condition than st tic at g owth percentage of fiber is explained by behaviour the incubation time l t d wi h presence of defect i specimen. Numeric l simulation of dynamic strength with different percentag of spiral fibers is giv n. Both siz effect and scale effect for concrete samples subjected to impact loading are consider d. S tistical nature of a ize ffect contrasts to a scale effect that is related to the definition f a spatio-tempor l r pr sentat v volume d termining the fractur event the g ven c lev l. © 2016 The Authors. Publish d by Elsevier B.V. Peer-review under espons bility of the Scientific Committee of ECF21. Keywords: fracture stress; strain rate; fiber; fracture scale level 1. Introduction The strength characteristics of concrete under dynamic loading are widely applied in fracture mechanics, construction and ivil eng ne ring fi lds. Nowa ays, a ctual problem is a reinforcing by the discrete additio of fibers with differ nt ge metry, percentage o fibers and ma erial (Hao and Hao (2013), Kruszka et al. (2015)). The rupture s ress in comparison with a volume rat o of fiber giv s good result in increment of the strength properties. However, some experiments (Song and Hwang (2004), Yet et al. (2012), Kruszka et al. (2015)) how a decrease of Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer-review under responsibility of the Scientific Committee of ECF21. © 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. Abstract

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: yp@YP1004.spb.edu 2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under r sponsibility of the Scientific Committee of ECF21. * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: yp@YP1004.spb.edu

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Copyright © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). Peer review under responsibility of the Scientific Committee of ECF21. 10.1016/j.prostr.2016.06.057