PSI - Issue 6

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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. Copyright © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. XXVII International Conference “Mathematical and Computer Simulations in Mechanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) The structural temporal approach to dynamic and quasi-static strength of rocks and concrete Ivan Smirnov a,b, *, Alexander Konstantinov a , Anatoly Bragov a Andrey Lomunov a and Yuri Petrov b a Research Institute for Mechanics, Lobachevsky State University of Nizhni Novgorod, 23 Prospekt Gagarina, Nizhny Novgorod, 603950, Russia b Faculty of Mathematics and Mechanics, Saint Petersburg University, 7/9 Universitetskaya nab., Saint Petersburg, 199034, Russia Abstract This work presents results of an experimental and theoretical study on dynamic and quasi-static failure of rocks and concrete. The results of dynamic compression and splitting of rocks (gabbro, granite, marble), as well as dry, water-saturated and frozen limestone and concrete are discussed. The tests were conducted using the Split-Hopkinson pressure bar with the diameter of 20 mm. It is shown that one material (or its condition) can have a lower dynamic strength for a higher static strength compared to the other material (or its condition). Also, it is shown a dependence of the threshold limit stress on the stress pulse duration. An unified interpretation of the experimental results, based on the structural – temporal approach is presented. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: dynamic effects of f ilure; quasi brittle failure; rock; concrete; SHPB; structural – temporal approach. 1. Introduction Intense short-term loads lead to effects of material strength, which are important to understand and take into account in the transition from slow to dynamic load. The experimental results (Abrosimov et al., 2012) and the theoretical calculations (Petrov et al., 2010) show that the strain rate dependence of spall strength may depend on duration of an impact pulse. The experimental results (Grote et al., 2001) and the theoretical calculations (Petrov et XXVII International Conference “Mathematical and Computer Simulations in echanics of Solids and Structures”. Fundamentals of Static and Dynamic Fracture (MCM 2017) The structural temporal approach to dynamic and quasi-static strength of rocks and concrete Ivan Smirnov a,b, *, Alexander Konstantinov a , Anatoly Bragov a Andrey Lomunov a and Yuri Petrov b a Research Institute for Mechanics, Lobachevsky tate University of Nizhn Novgorod, 23 Prospekt Gagarina, Nizhny Novgorod, 603950, Russia b Faculty of Mathematics and Mechanics, Saint Petersburg University, 7/9 Universitetskaya nab., Saint Petersburg, 199034, Russia Abstract is work presents results of an experimental and theoretical study on dyna ic and quasi-st tic failure of rocks and concrete. The results of dynamic compression and splitting of rocks (gabbro, granite, marble), as well as dry, water-saturated and frozen li estone and concrete are discussed. The tests were conducted using the Split-Hopkinson pressure bar with the diameter of 20 mm. It is shown that one material (or its condition) can have a lower dynamic strength for a higher static strength compared to the other materi l (or its condition). Also, it is shown a dependen e of th threshold limit stress on the stress pulse duration. An unified interpretation of the experimental results, based on the structural – temporal approach is presented. © 2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. Keywords: dynamic effects of failure; quasi brittle failure; rock; concrete; SHPB; structural – temporal approach. 1. Introduction Intense short-term loads lead to effects of material strength, which are important to understand and take into account in the transition from slow to dynamic load. The experimental results (Abrosimov et al., 2012) and the theoretical calculations (Petrov et al., 2010) show that the strain rate dependence of spall strength may depend on duration of an impact pulse. The experimental results (Grote et al., 2001) and the theoretical calculations (Petrov et © 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’s E-mail : i.v.smirnov@spbu.ru * Corresponding author’s E-mail : i.v.smirnov@spbu.ru

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452 3216 © 201 7 Th Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 2452-3216 © 201 7 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers.

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216 Copyright  2017 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the MCM 2017 organizers. 10.1016/j.prostr.2017.11.006