PSI - Issue 2_A

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 2 (2016) 389–394 ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 ScienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com

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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 Dynamic crack prop gation: quasistatic and impact loading Yuri Petrov a,c , Nikita Kazarinov a,b * , , Vladimir Bratov a,c a Saint Petersburg State University, Saint Petersburg 199034 b Lavrentyev Institute of Hydrodynamics, Siberian Branch of the RAS, Novosibirsk 630590, Russia c Institute of Problems of Mechanical Engineering RAS, Saint Petersburg 199178, Russia Simulation of dynamic crack growth under quasistatic loading was performed using finite element method with embedded incubation time fracture criterion. The uniqueness of the stress intensity factor – crack velocity relationship (K-v) is discussed. It is shown that the use of the structural – time approach and the fracture incubation time criterion enables us to predict successfully the results of experiments both on quasistatic and on impact loading of samples with cracks. Comparison of calculated K-v relationships with experimental data for various loading conditions leads to the conclusion that the dependence of the crack velocity on the stress intensity factor cannot be considered as a unique material law because the properties of this dependence are strongly determined by the sample configuration, the history, and the loading method. © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of ECF21. Keywords: Dynamic fracture; Incubation time; FEM; Stress intencity factor 1. Introduction Stress intensity factor (SIF) is often regarded as a key parameter in the framework of classic linear fracture mechanics. This parameter is used to d fine stress-strain field in the vicinity of a crack tip. A corresponding classic static fracture criterion is naturally extended to the case of dynamic crack propagation (see Owen et al. (1998)): ( , ( ), Ω ( ), ( )̇ ) ≤ ( ( )̇, , … ) . (1), 21st European Conference on Fracture, ECF21, 20-24 June 2016, Catania, Italy Dynamic crack propagation: quasistatic and impact loading Yuri Petrov a,c , Nikita Kazarinov a,b * , , Vladimir Bratov a,c a Saint Petersburg State University, Saint Petersburg 199034 b Lavrentyev Institute of Hydrodynamics, Siberian Branch of the RAS, Novosibirsk 630590, Russia c I stitute of Problems of Mechanical Engineering RAS, Saint Petersburg 199178, Russia Abstract Simulation of dynamic crack growth under quasistatic loading was performed using finite element method with embedded incubati time fracture iterion. The uniqueness of the stress intensity factor – crack velocity relatio ship (K-v) is discusse . It s shown that the use of the structural – time approach and h fracture incubation time criterion en bles us to predict suc e fully the results of experiments both on quasist tic and on impact loading of samples with c acks. Comparis n of alc lated K-v relationships with xperimental data for various loa ing conditions leads t the conclusion that the dependence of the crack v locity on the stress intensity factor c nnot be considered as a unique materi l law b ause the properti s of this dependence re str ngl determin d by he sample configuration, the history, nd the loading method. © 2016 The Authors. Published by Elsevier B.V. Peer-review under es ons bility of the Scientific Committee of ECF21. Keywords: Dynamic fracture; Incubation time; FEM; Stress intencity factor 1. Introduction Str ss i tensity factor (SIF) is often regarded as a key parameter in the framework of classic linear fracture mechanics. This par meter is used to define stress-strain fi ld in the vicinity of a crack tip. A orrespo ding classic static fra ture criterion is naturally extended to the case of dynamic crack propag tion (see Owen et al. (1998)): ( , ( ), Ω ( ), ( )̇ ) ≤ ( ( )̇, , … ) . (1), 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.:+7-964-366-6464. E-mail address: nkazarinov@gmail.com * Corresponding author. Tel.:+7-964-366-6464. E-mail ad ress: nkazarinov@gmail.com

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

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.2016.06.050